1
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Shankar M, Lee DJ, Inaththappulige SINH, Acharya A, Yennawar HP, Giri R. Interception and Synthetic Application of Diradical and Diene Forms of Dual-Nature Azabicyclic o-Quinodimethanes Generated by 6π-Azaelectrocyclization. Angew Chem Int Ed Engl 2024; 63:e202409613. [PMID: 39024419 DOI: 10.1002/anie.202409613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 07/01/2024] [Accepted: 07/16/2024] [Indexed: 07/20/2024]
Abstract
We demonstrate that 2-alkenylarylaldimines and ketimines undergo thermal 6π-azaelectrocyclization to generate a wide range of azabicyclic o-quinodimethanes (o-QDMs). These o-QDMs exist as a hybrid of a diene and a benzylic diradical. The diradical nature was confirmed by their ability to undergo dimerization and react with H-atom donor, 2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) and O2. In addition, the interception of the diradicaloid o-QDMs by H-atom transfer was used to synthesize five tetrahydroisoquinoline alkaloids and related bioactive molecules. The diene form can undergo [4+2] cycloaddition reactions with different dienophiles to generate bridged azabicycles in high endo:exo selectivity. The azabicyclic o-QDMs can be generated for [4+2] cycloaddition from a wide range of electronically and sterically varied 2-alkenylarylimines, including mono, di, tri and tetrasubstituted alkenes, and imines derived from arylamine, alkylamine (1°, 2°, 3°), benzylamine, benzylsulfonamide and Boc-amine.
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Affiliation(s)
- Majji Shankar
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States
| | - Daniel J Lee
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States
| | | | - Ayush Acharya
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States
| | - Hemant P Yennawar
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States
| | - Ramesh Giri
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States
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2
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Pei Z, Connor KPE, Magann NL, Gardiner MG, Coote ML, Sherburn MS. Radical versus Non-Radical Reactivity in ortho- and para-Quinonedimethides and Implications for Cycloaddition Mechanisms. Org Lett 2024; 26:8110-8114. [PMID: 39283019 DOI: 10.1021/acs.orglett.4c03001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2024]
Abstract
The latent singlet diradical character of the parent ortho-quinonedimethide (o-QDM), as revealed by valence bond calculations, is demonstrated experimentally by trapping with the kinetically stable free radical TEMPO at room temperature. In the absence of TEMPO, the main pathway for decomposition at ambient temperature is not (as previously proposed in the literature) a radical reaction but instead a concerted Diels-Alder dimerization, which through ωB97X-D/aug-cc-pVTZ/SMD//M06-2X-D3/6-31+G(d,p)/SMD calculations is shown to proceed through an ambimodal bispericyclic transition state. The predominantly non-radical reactivity of o-QDM at room temperature differs from that of its isomeric para-quinonedimethide (p-QDM) congener, which self-reacts exclusively through radical pathways. These findings suggest the potential for tunable concerted/stepwise cycloadditions.
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Affiliation(s)
- Zhipeng Pei
- Institute for Nanoscale Science & Technology, Flinders University, Bedford Park, South Australia 5042, Australia
| | - Kieran P E Connor
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Nicholas L Magann
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Michael G Gardiner
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Michelle L Coote
- Institute for Nanoscale Science & Technology, Flinders University, Bedford Park, South Australia 5042, Australia
| | - Michael S Sherburn
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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3
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Tay G, Nishimura S, Oguri H. Direct photochemical intramolecular [4 + 2] cycloadditions of dehydrosecodine-type substrates for the synthesis of the iboga-type scaffold and divergent [2 + 2] cycloadditions employing micro-flow system. Chem Sci 2024:d4sc02597k. [PMID: 39345776 PMCID: PMC11423653 DOI: 10.1039/d4sc02597k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Accepted: 08/15/2024] [Indexed: 10/01/2024] Open
Abstract
Photocyclisation reactions offer a convenient and versatile method for constructing complex polycyclic scaffolds, particularly in the synthesis of natural products. While the [2 + 2] photocycloaddition reaction is well-established and extensively reported, the [4 + 2] counterpart via direct photochemical means remains challenging and relatively unexplored. In this work, we devised the rapid assembly of the iboga-type scaffold through photochemical intramolecular Diels-Alder reaction using a common biomimetic dehydrosecodine-type intermediate having vinyl indole and dihydropyridine (DHP) sub-units. Exploiting a micro-flow system, the medicinally important iboga-type scaffold was obtained up to 77% yield under mild, neutral conditions at room temperature. This study demonstrated the site-selective activation of the DHP moiety by direct UV-LED irradiation, eliminating the need for external photocatalysts or photosensitisers and showing good tolerance to a wide range of stabilised dehydrosecodine-type substrates. By adjusting the spatial arrangement of the DHP ring and the vinyl indole group, this versatile photochemical approach efficiently facilitates both [4 + 2] and [2 + 2] cyclisations, assembling architecturally complex multicyclic scaffolds. Precise photoactivation of the DHP subunit, generating short-lived biradical species, enabled the new way of harnessing the hidden but innately pre-encoded reactivity of the polyunsaturated dehydrosecodine-type intermediate. These photo-mediated [4 + 2] cyclisation and divergent [2 + 2] cycloadditions are distinct from biosynthetic processes, which are mainly mediated through concerted thermal cycloadditions.
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Affiliation(s)
- Gavin Tay
- Department of Chemistry, Graduate School of Science, The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Soushi Nishimura
- Department of Chemistry, Graduate School of Science, The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Hiroki Oguri
- Department of Chemistry, Graduate School of Science, The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan
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4
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Fu Y, Simeth NA, Szymanski W, Feringa BL. Visible and near-infrared light-induced photoclick reactions. Nat Rev Chem 2024; 8:665-685. [PMID: 39112717 DOI: 10.1038/s41570-024-00633-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/2024] [Indexed: 09/11/2024]
Abstract
Photoclick reactions combine the advantages offered by light-driven processes, that is, non-invasive and high spatiotemporal control, with classical click chemistry and have found applications ranging from surface functionalization, polymer conjugation, photocrosslinking, protein labelling and bioimaging. Despite these advances, most photoclick reactions typically require near-ultraviolet (UV) and mid-UV light to proceed. UV light can trigger undesirable responses, including cellular apoptosis, and therefore, visible and near-infrared light-induced photoclick reaction systems are highly desirable. Shifting to a longer wavelength can also reduce degradation of the photoclick reagents and products. Several strategies have been used to induce a bathochromic shift in the wavelength of irradiation-initiating photoclick reactions. For instance, the extension of the conjugated π-system, triplet-triplet energy transfer, multi-photon excitation, upconversion technology, photocatalytic and photoinitiation approaches, and designs involving photocages have all been used to achieve this goal. Current design strategies, recent advances and the outlook for long wavelength-driven photoclick reactions are presented.
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Affiliation(s)
- Youxin Fu
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Groningen, The Netherlands
| | - Nadja A Simeth
- Institute for Organic and Biomolecular Chemistry, Georg-August-University Göttingen, Göttingen, Germany.
| | - Wiktor Szymanski
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Groningen, The Netherlands.
- Department of Radiology, Medical Imaging Center, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands.
- Department of Medicinal Chemistry, Photopharmacology and Imaging, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, The Netherlands.
| | - Ben L Feringa
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, Faculty for Science and Engineering, University of Groningen, Groningen, The Netherlands.
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5
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Tang Q, Liu Y, Fei B, Tao Q, Wang C, Jiang X, He X, Shang Y. Base-Mediated Cascade Lactonization/1,3-Dipolar Cycloaddition Pathway for the One-Pot Assembly of Coumarin-Functionalized Pyrrolo[2,1- a]isoquinolines. J Org Chem 2024; 89:8420-8434. [PMID: 38836769 DOI: 10.1021/acs.joc.4c00239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
An elegant and highly concise strategy for the construction of coumarin-functionalized pyrrolo[2,1-a]isoquinolines from available propargylamines and isoquinolinium N-ylides has been disclosed. In this reaction, isoquinolinium N-ylides acted as a C2 synthon to form a coumarin ring as well as a 1,3-dipole to construct a pyrrole ring in a single pot. This cascade process involves 1,4-conjugate addition/lactonization/1,3-dipolar cycloaddition to construct four chemical bonds (one C-O bond and three C-C bonds) and two new heterocyclic skeletons. Additionally, most of these compounds showed good fluorescence properties and exhibited high molar extinction coefficient and large Stokes shifts.
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Affiliation(s)
- Qiang Tang
- The Translational Research Institute for Neurological Disorders & Interdisciplinary Research Center of Neuromedicine and Chemical Biology of Wannan Medical College and Anhui Normal University, Department of Neurosurgery, The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College), Wuhu 241001, P. R. China
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
- The Institutes of Brain Science, Wannan Medical College, Wuhu 241001, P. R. China
| | - Yanan Liu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
| | - BinBin Fei
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
| | - Qianqian Tao
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
| | - Chen Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
| | - Xiaochun Jiang
- The Translational Research Institute for Neurological Disorders & Interdisciplinary Research Center of Neuromedicine and Chemical Biology of Wannan Medical College and Anhui Normal University, Department of Neurosurgery, The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College), Wuhu 241001, P. R. China
- The Institutes of Brain Science, Wannan Medical College, Wuhu 241001, P. R. China
| | - Xinwei He
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
| | - Yongjia Shang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China
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6
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Pyromali C, Patelis N, Cutrano M, Gosika M, Glynos E, Moreno AJ, Sakellariou G, Smrek J, Vlassopoulos D. Nonmonotonic Composition Dependence of Viscosity upon Adding Single-Chain Nanoparticles to Entangled Polymers. Macromolecules 2024; 57:4826-4832. [PMID: 38910846 PMCID: PMC11191425 DOI: 10.1021/acs.macromol.4c00206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 03/24/2024] [Accepted: 04/30/2024] [Indexed: 06/25/2024]
Abstract
Well-characterized single-chain nanoparticles (SCNPs), synthesized from a linear polystyrene precursor through an intramolecular [4 + 4] thermal cycloaddition cross-linking reaction in dilute conditions, were added to entangled polystyrene melts at different concentrations. Starting from the pure linear melt, which is much more viscous than the melt of SCNPs, the zero-shear viscosity increased upon the addition of nanoparticles and reached a maximum before eventually dropping to the value of the SCNP melt. Molecular simulations reveal the origin of this unexpected behavior, which is the interplay of the very different compositional dependences of the dynamics of the two components. The SCNPs become much slower than the linear chains as their concentration decreases because they are threaded by the linear chains, reaching a maximum viscosity which is higher than that of the linear chains at a fraction of about 20%. This behavior is akin to that of single-loop ring polymers when added to linear matrices. This finding provides insights into the design and use of SCNPs as effective entropic viscosity modifiers of polymers and contributes to the discussion of the physics of loopy structures.
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Affiliation(s)
- Christina Pyromali
- FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece
- Department
of Materials Science and Technology, University
of Crete, Heraklion 71110, Crete, Greece
| | - Nikolaos Patelis
- Department
of Chemistry, National and Kapodistrian
University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
| | - Marta Cutrano
- FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece
- Dipartimento
di Ingegneria Chimica e Materiali, Università
Degli Studi di Cagliari, Piazza D’Armi, I-09123 Cagliari, Italy
| | - Mounika Gosika
- Centro
de Fisica de Materiales (CSIC-UPV/EHU) and Materials Physics Center
MPC, Paseo Manuel de
Lardizabal 5, E-20018 San Sebastian, Spain
- Department
of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014 Tamil
Nadu, India
| | - Emmanouil Glynos
- FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece
- Department
of Materials Science and Technology, University
of Crete, Heraklion 71110, Crete, Greece
| | - Angel J. Moreno
- Centro
de Fisica de Materiales (CSIC-UPV/EHU) and Materials Physics Center
MPC, Paseo Manuel de
Lardizabal 5, E-20018 San Sebastian, Spain
- Donostia
International Physics Center, Paseo Manuel de Lardizabal 4, E-20018 San Sebastian, Spain
| | - Georgios Sakellariou
- Department
of Chemistry, National and Kapodistrian
University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
| | - Jan Smrek
- Faculty
of Physics, University of Vienna, 1090 Vienna, Austria
| | - Dimitris Vlassopoulos
- FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece
- Department
of Materials Science and Technology, University
of Crete, Heraklion 71110, Crete, Greece
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7
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Hao JJ, Wu J, Jiang T, Luo H, Li RT. Gold-Catalyzed Reactions of Enynals with Alkenes for Synthesis Binaphthyl Derivatives. J Org Chem 2024; 89:6074-6084. [PMID: 38626391 DOI: 10.1021/acs.joc.4c00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
A PPh3Au[B(C6F5)4]-catalyzed reaction of enynals and alkenes for the construction of binaphthyl derivatives was described. This transformation was achieved through o-Quinodimethane (o-QDM) intermediate's extended conjugated addition process. The reaction has the advantages of wide substrate scopes, mild reaction conditions, high efficiency, and good scalability.
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Affiliation(s)
- Jun-Jie Hao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China
| | - Juan Wu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China
| | - Tao Jiang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China
| | - Hejiang Luo
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China
| | - Rong-Tao Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China
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8
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Marcantonio E, Curti C. Shaping Chirality via Stereoselective, Organocatalytic [4+2] Cycloadditions involving Heterocyclic ortho-Quinodimethanes. Chemistry 2024; 30:e202304001. [PMID: 38235930 DOI: 10.1002/chem.202304001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/12/2024] [Accepted: 01/15/2024] [Indexed: 01/19/2024]
Abstract
Polycyclic compounds bearing a complex heterocyclic core such as an aromatic heterocycle "fused" with one or more functionalized rings, are widespread leading molecules in the domain of synthetic organic chemistry and pharmaceuticals. Although many synthetic methodologies have been devised to access achiral, fused heteroaromatic scaffolds, or related chiral variants adorned with out-of-cycle stereogenic elements, equally efficient strategies to afford chiral heterocycles featuring in-cycle stereocenters, exist to a lesser extent and presently represent a growing field of investigation. The mild, organocatalytic generation of elusive ortho-quinodimethane intermediates (oQDMs), derived from suitable heteroaromatic carbonyl- or carbonyl-like pronucleophiles has recently proved successful in the synthesis of such peculiar chiral architectures via stereoselective [4+2] cycloadditions. This review provides an overview of the most important advances attained in this field over the last decade.
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Affiliation(s)
- Enrico Marcantonio
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - Claudio Curti
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
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9
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Sarkar D, Barik S, Shee S, Gonnade RG, Biju AT. NHC-Catalyzed Enantioselective Synthesis of Tetracyclic δ-Lactones by (4 + 2) Annulation of ortho-Quinodimethanes with Activated Ketones. Org Lett 2023; 25:7852-7857. [PMID: 37862445 DOI: 10.1021/acs.orglett.3c03076] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2023]
Abstract
The N-heterocyclic carbene (NHC)-catalyzed generation of ortho-quinodimethanes (o-QDMs) from 9H-fluorene-1-carbaldehydes followed by the interception with activated ketones resulting in the enantioselective synthesis of tetracyclic δ-lactones is presented. High diastereoselectivity of products, remote C(sp3)-H functionalization, broad substrate scope, and mild reaction conditions are the notable features of the present (4 + 2) annulation.
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Affiliation(s)
- Deeptanu Sarkar
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Shilpa Barik
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Sayan Shee
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Rajesh G Gonnade
- Centre for Materials Characterization, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India
| | - Akkattu T Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
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10
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Dyguda M, Przydacz A, Albrecht Ł. Dearomative, aminocatalytic formal normal-electron-demand aza-Diels-Alder cycloaddition in the synthesis of tetrahydrofuropyridines. Chem Commun (Camb) 2023; 59:12903-12906. [PMID: 37819685 DOI: 10.1039/d3cc03946c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
In the manuscript the application of dearomative formal normal-electron-demand aza-Diels-Alder cycloaddition in the synthesis of tetrahydrofuropyridines is described. The developed approach utilizes aminocatalytic activation of 2-alkyl-3-furfurals that proceeds via formation of the dearomatized dienamine intermediate. Initially obtained cycloadducts have been subjected to subsequent transformations providing access to tetrahydrofuropyridines or functionalized cinnamates. The mechanism of the process has been confirmed by DFT calculations.
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Affiliation(s)
- Mateusz Dyguda
- Faculty of Chemistry, Institute of Organic Chemistry Lodz University of Technology Żeromskiego 114, 90-543 Lodz, Poland.
| | - Artur Przydacz
- Faculty of Chemistry, Institute of Organic Chemistry Lodz University of Technology Żeromskiego 114, 90-543 Lodz, Poland.
| | - Łukasz Albrecht
- Faculty of Chemistry, Institute of Organic Chemistry Lodz University of Technology Żeromskiego 114, 90-543 Lodz, Poland.
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11
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Yang JM, Lin YK, Sheng T, Hu L, Cai XP, Yu JQ. Regio-controllable [2+2] benzannulation with two adjacent C(sp 3)-H bonds. Science 2023; 380:639-644. [PMID: 37167386 PMCID: PMC10243499 DOI: 10.1126/science.adg5282] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 04/03/2023] [Indexed: 05/13/2023]
Abstract
Regiocontrol in traditional cycloaddition reactions between unsaturated carbon compounds is often challenging. The increasing focus in modern medicinal chemistry on benzocyclobutene (BCB) scaffolds indicates the need for alternative, more selective routes to diverse rigid carbocycles rich in C(sp3) character. Here, we report a palladium-catalyzed double C-H activation of two adjacent methylene units in carboxylic acids, enabled by bidentate amide-pyridone ligands, to achieve a regio-controllable synthesis of BCBs through a formal [2+2] cycloaddition involving σ bonds only (two C-H bonds and two aryl-halogen bonds). A wide range of cyclic and acyclic aliphatic acids, as well as dihaloheteroarenes, are compatible, generating diversely functionalized BCBs and hetero-BCBs present in drug molecules and bioactive natural products.
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Affiliation(s)
- Ji-Min Yang
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Yu-Kun Lin
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Tao Sheng
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Liang Hu
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Xin-Pei Cai
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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12
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Okanishi Y, Ishikawa T, Jinnouchi T, Hayashi S, Takanami T, Aoyama H, Yoshimitsu T. Radical-Based Route to Functionalized Tetralin: Formal Total Synthesis of (±)-Hamigeran B. J Org Chem 2023; 88:1085-1092. [PMID: 36625755 DOI: 10.1021/acs.joc.2c02552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A formal synthetic route to hamigeran B, an antiviral marine natural product with a unique tricyclic molecular architecture, has been developed. The key chemical transformations in the present route include a novel zinc(II)porphyrin-catalyzed photoredox radical cascade cyclization to access a functionalized tetralin, a catalyst-free benzylic radical bromination with NBS by visible-light irradiation, and a samarium(II)-induced cyclization of brominated tetralone possibly via an orthoquinodimethane-like intermediate.
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Affiliation(s)
- Yusuke Okanishi
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Tohru Ishikawa
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Takuya Jinnouchi
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Satoshi Hayashi
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Toshikatsu Takanami
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Hiroshi Aoyama
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita 565-0871, Osaka, Japan
| | - Takehiko Yoshimitsu
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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13
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McLeod D, Inunnguaq Jessen N, Nguyen TVQ, Espe M, Erickson JD, Anker Jørgensen K, Yang L, Houk KN. Influence of Achiral Phosphine Ligands on a Synergistic Organo- and Palladium-Catalyzed Asymmetric Allylic Alkylation. Chemistry 2022; 28:e202202951. [PMID: 36129762 PMCID: PMC10091967 DOI: 10.1002/chem.202202951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Indexed: 11/08/2022]
Abstract
An unusual diastereodivergent stereoselective allylation reaction is presented. It consists of a palladium-catalyzed allylation reaction of an organocatalytically generated amino isobenzofulvene, where the diastereoselectivity is controlled by the electronic properties of a monodentate, achiral ligand on palladium. One major diastereoisomer is formed using triarylphosphines substituted with neutral or electron-donating substituents of the aryl group, while those with electron-withdrawing substituents favor the other diastereoisomer. The diastereoselectivity correlates with the Taft inductive parameter of substituents on the triarylphosphine ligand on palladium. The synergistic reaction involves both a catalytic secondary amine catalyst for the indene-aldehyde activation and the monodentate phosphine ligands on palladium, affording a highly enantioselective reaction with up to 98 % enantiomeric excess. Based on computational investigations, the role of the monodentate phosphine ligand on the diastereoselectivity is discussed.
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Affiliation(s)
- David McLeod
- Department of ChemistryAarhus UniversityLangelandsgade 1408000Aarhus CDenmark
| | | | - Thanh V. Q. Nguyen
- Department of ChemistryAarhus UniversityLangelandsgade 1408000Aarhus CDenmark
| | - Marcus Espe
- Department of ChemistryAarhus UniversityLangelandsgade 1408000Aarhus CDenmark
| | | | | | - Limin Yang
- College of MaterialsChemistry and Chemical EngineeringHangzhou Normal University311121HangzhouP. R. China
| | - K. N. Houk
- Department of Chemistry and BiochemistryDepartment of Biochemical and Biomolecular EngineeringUniversity of California90095Los AngelesCaliforniaUSA
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14
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Dong J, Ostertag A, Sparr C. o-Quinodimethane Atropisomers: Enantioselective Synthesis and Stereospecific Transformation. Angew Chem Int Ed Engl 2022; 61:e202212627. [PMID: 36256547 PMCID: PMC10100317 DOI: 10.1002/anie.202212627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Indexed: 11/07/2022]
Abstract
o-Quinodimethanes have remarkable utility as reactive intermediates in Diels-Alder reactions, enabling significantly accelerated routes to complex polycyclic compounds. The discovery of different discrete precursors to thermally generate o-quinodimethanes thereby greatly augmented their availability and versatility. However, due to the required high temperatures and the immense reactivity of o-quinodimethanes, stereoselectivity to afford isomerically defined products still constitutes a critical challenge. Herein, we describe the accessibility of atropisomeric o-quinodimethanes, the enantioselective synthesis of their precursors, their remarkable configurational stability and the stereospecific transformation by the benzannulation of dienophiles. A catalyst-stereocontrolled [2+2+2] cycloaddition, the generation of o-quinodimethane atropisomers and ensuing stereospecific Diels-Alder reactions enabled enantioselectivities through these transient intermediates with of up to 96 : 4 e.r.
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Affiliation(s)
- Jianyang Dong
- Department of ChemistryUniversity of BaselSt. Johanns-Ring 194056BaselSwitzerland
- NCCR Molecular Systems EngineeringBPR 1095Mattenstrasse 24a4058BaselSwitzerland
| | - Andreas Ostertag
- Department of ChemistryUniversity of BaselSt. Johanns-Ring 194056BaselSwitzerland
- NCCR Molecular Systems EngineeringBPR 1095Mattenstrasse 24a4058BaselSwitzerland
| | - Christof Sparr
- Department of ChemistryUniversity of BaselSt. Johanns-Ring 194056BaselSwitzerland
- NCCR Molecular Systems EngineeringBPR 1095Mattenstrasse 24a4058BaselSwitzerland
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15
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Maag PH, Feist F, Frisch H, Roesky PW, Barner-Kowollik C. Fluorescent and Catalytically Active Single Chain Nanoparticles. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Patrick H. Maag
- School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, Brisbane, Queensland 4000, Australia
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrase 15, Karlsruhe 76131, Germany
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
| | - Florian Feist
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
| | - Hendrik Frisch
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George Street, Brisbane, Queensland 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, Brisbane, Queensland 4000, Australia
| | - Peter W. Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrase 15, Karlsruhe 76131, Germany
| | - Christopher Barner-Kowollik
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George Street, Brisbane, Queensland 4000, Australia
- School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, Brisbane, Queensland 4000, Australia
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
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16
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Liao H, Miñoza S, Lee S, Rueping M. Aza‐
Ortho
‐Quinone Methides as Reactive Intermediates: Generation and Utility in Contemporary Asymmetric Synthesis. Chemistry 2022; 28:e202201112. [DOI: 10.1002/chem.202201112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Hsuan‐Hung Liao
- Department of Chemistry National Sun Yat-sen University (NSYSU) 70 Lien-hai Rd. Kaohsiung 80424 Taiwan, (R.O.C
| | - Shinje Miñoza
- Department of Chemistry National Sun Yat-sen University (NSYSU) 70 Lien-hai Rd. Kaohsiung 80424 Taiwan, (R.O.C
| | - Shao‐Chi Lee
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia
| | - Magnus Rueping
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia
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17
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Yang L, Li WY, Hou L, Zhan T, Cao W, Liu X, Feng X. Nickel II-catalyzed asymmetric photoenolization/Mannich reaction of (2-alkylphenyl) ketones. Chem Sci 2022; 13:8576-8582. [PMID: 35974747 PMCID: PMC9337722 DOI: 10.1039/d2sc02721f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 06/21/2022] [Indexed: 11/21/2022] Open
Abstract
A diastereo- and enantioselective photoenolization/Mannich (PEM) reaction of ortho-alkyl aromatic ketones with benzosulfonimides was established by utilizing a chiral N,N'-dioxide/Ni(OTf)2 complex as the Lewis acid catalyst. It afforded a series of benzosulfonamides and the corresponding ring-closure products, and a reversal of diastereoselectivity was observed through epimerization of the benzosulfonamide products under continuous irradiation. On the basis of the control experiments, the role of the additive LiNTf2 in achieving high stereoselectivity was elucidated. This PEM reaction was proposed to undergo a direct nucleophilic addition mechanism rather than a hetero-Diels-Alder/ring-opening sequence. A possible transition state model with a photoenolization process was proposed to explain the origin of the high level of stereoinduction.
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Affiliation(s)
- Liangkun Yang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Wang-Yuren Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Liuzhen Hou
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Tangyu Zhan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Weidi Cao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
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18
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Tang Y, Ejlli B, Niu K, Li X, Hao Z, Xu C, Zhang H, Rominger F, Freudenberg J, Bunz UHF, Muellen K, Chi L. On‐Surface Debromination of 2,3‐Bis(dibromomethyl)‐ and 2,3‐Bis(bromomethyl)naphthalene: Dimerization or Polymerization? Angew Chem Int Ed Engl 2022; 61:e202204123. [PMID: 35474405 PMCID: PMC9401070 DOI: 10.1002/anie.202204123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Yanning Tang
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Barbara Ejlli
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Kaifeng Niu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Xuechao Li
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Zhengming Hao
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Chaojie Xu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Haiming Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Frank Rominger
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Jan Freudenberg
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Uwe H. F. Bunz
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Klaus Muellen
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Lifeng Chi
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
- Macao Institute of Materials Science and Engineering (MIMSE) MUST-SUDA Joint Research Center for Advanced Functional Materials Macau University of Science and Technology Taipa 999078 Macao China
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19
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Zhou Z, Zhang J, Qu Z. Dearomatization of Benzenoid Arenes Triggered by Triplet Excited State Intramolecular Proton Transfer. J Phys Chem A 2022; 126:4424-4431. [PMID: 35763759 DOI: 10.1021/acs.jpca.2c02930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The detailed mechanism of photoinduced dearomatization of benzenoid arenes is investigated using both the high-level ab initio method and density functional theory. The results suggest that the optically allowed singlet excited state (S2) can quickly decay to the lowest triplet excited state (T1) through a barrierless internal conversion and intersystem crossing. Importantly, we find a triplet excited state intramolecular proton transfer (T-ESIPT) pathway to produce a diradical triplet intermediate (3MO-H), which can trigger the subsequent [4 + 2] dearomatization reaction. Furthermore, the diastereoselectivity of the reaction was illustrated by the rotation of the O-H group of 3MO-H, which could be effectively modulated by the solvent effect (arising from the strength of the intermolecular hydrogen bond) and the substituted effect (arising from the strength of the electron-donation group). This photochemical mechanism can explain well the experimental observations, and the novel T-ESIPT process can open a new door in studying the photoinduced proton transfer reactions.
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Affiliation(s)
- Zhongjun Zhou
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Jilong Zhang
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Zexing Qu
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
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20
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Wang J, Luo H, Wang X, Wei D, Tian R, Duan Z. Dearomatization [4+2] Cycloaddition of Nonactivated Benzene Derivatives. Org Lett 2022; 24:4404-4408. [PMID: 35687509 DOI: 10.1021/acs.orglett.2c01630] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dearomatization reactions have recently emerged as a powerful tool for the rapid buildup of molecular complexity. Here, an unparalleled thermal dearomatization [4+2] cycloaddition reaction between benzene derivatives and a 2H-phosphindole tungsten complex was reported. The unique reactivity of the in situ-generated 2H-phosphindole complex toward benzene was revealed by density functional theory calculations. We thus provide new insights into the dearomatization of nonactivated arenes and pave the way for the manipulation of the dearomatization for further applications.
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Affiliation(s)
- Junjian Wang
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Haotian Luo
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Xinghua Wang
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Donghui Wei
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Rongqiang Tian
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Zheng Duan
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China
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21
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Feist F, Rodrigues LL, Walden SL, Barner-Kowollik C. Regioisomerism in Symmetric Dimethyl Dialdehydes Dictates their Photochemical Reactivity. J Org Chem 2022; 87:9296-9300. [PMID: 35749632 DOI: 10.1021/acs.joc.2c01020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We herein report the first light-driven selective monoderivatization (desymmetrization) of two chemically equivalent carbonyl groups in a single chromophore. By comparing of four symmetric regioisomers, featuring two equivalent ortho-methylbenzaldehyde units, we identify dimethyltherephtalaldehydes (DMTAs) which can be activated in a dual wavelength-selective fashion. Under visible light and UV-light irradiation, DMTAs undergo two consecutive Diels-Alder reactions exhibiting near-quantitative endo-selectivity (>99%) and provide excellent yields (96-98%). The influence of the regioisomerism of the dialdehydes on their photochemical behavior is profound, evidenced by an in-depth investigation of their photochemical performance. We exemplify the capability of the photosystems via the synthesis of complex Diels-Alder adducts with various dienophiles, including alkynes.
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Affiliation(s)
- Florian Feist
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Leona L Rodrigues
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia
| | - Sarah L Walden
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia
| | - Christopher Barner-Kowollik
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.,Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, Queensland 4000, Australia
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22
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Pramanik A, Ghatak A, Khanra S, Das D, Rakshit T, Bhar S. Metal Free Approach towards the Synthesis of Structurally Diverse 1, 2‐Dihydronaphthalene Scaffolds and Theoretical Investigation. ChemistrySelect 2022. [DOI: 10.1002/slct.202201159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Amit Pramanik
- Department of Chemistry A. B. N. Seal College Cooch Behar Pin-736 101 West Bengal India
| | - Avishek Ghatak
- Department of Chemistry Dr. A. P. J. Abdul Kalam Government College Kolkata 700156 India
| | - Somnath Khanra
- Department of Chemistry A. B. N. Seal College Cooch Behar Pin-736 101 West Bengal India
- Department of Chemistry The University of Burdwan Bardhaman 713104 West Bengal India
| | - Debasis Das
- Department of Chemistry The University of Burdwan Bardhaman 713104 West Bengal India
| | - Tatini Rakshit
- Department of Chemistry School of Natural Sciences Shiv Nadar University Dadri UP 201314 India
| | - Sanjay Bhar
- Department of Chemistry Organic Chemistry Section Jadavpur University Kolkata 700 032 India
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23
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Tang Y, Ejlli B, Niu K, Li X, Hao Z, Xu C, Zhang H, Rominger F, Freudenberg J, Bunz UHF, Muellen K, Chi L. On‐Surface Debromination of 2,3‐Bis(dibromomethyl)‐ and 2,3‐Bis(bromomethyl)naphthalene: Dimerization or Polymerization? Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yanning Tang
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Barbara Ejlli
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Kaifeng Niu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Xuechao Li
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Zhengming Hao
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Chaojie Xu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Haiming Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
| | - Frank Rominger
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Jan Freudenberg
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Uwe H. F. Bunz
- Organisch Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Klaus Muellen
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Lifeng Chi
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Ren'ai road No. 199 Suzhou Jiangsu 215123 China
- Macao Institute of Materials Science and Engineering (MIMSE) MUST-SUDA Joint Research Center for Advanced Functional Materials Macau University of Science and Technology Taipa 999078 Macao China
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24
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Saiegh T, Meyer C, Cossy J. Rhodium(III)‐Catalyzed Heteroannulations of 3‐Sulfolene Derivatives via C(sp2)–H Activation. Access to Pyridine ortho‑Quinodimethane Precursors. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tomas Saiegh
- ESPCI Paris Molecular, Macromolecular Chemistry, and Materials FRANCE
| | - Christophe Meyer
- ESPCI Paris, CNRS, PSL Research University Laboratory of Organic Chemsitry 10 rue Vauquelin 75005 PARIS FRANCE
| | - Janine Cossy
- ESPCI: ESPCI Paris Molecular, Macromolecular Chemistry, and Materials PARIS FRANCE
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25
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Fujii T, Gallarati S, Corminboeuf C, Wang Q, Zhu J. Modular Synthesis of Benzocyclobutenes via Pd(II)-Catalyzed Oxidative [2+2] Annulation of Arylboronic Acids with Alkenes. J Am Chem Soc 2022; 144:8920-8926. [PMID: 35561421 DOI: 10.1021/jacs.2c03565] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Benzocyclobutenes (BCBs) are highly valuable compounds in organic synthesis, medicinal chemistry, and materials science. However, catalytic modular synthesis of functionalized BCBs from easily accessible starting materials remains limited. We report herein an efficient synthesis of diversely functionalized BCBs by a Pd(II)-catalyzed formal [2+2] annulation between arylboronic acids and alkenes in the presence of N-fluorobenzenesulfonimide (NFSI). An intermolecular carbopalladation followed by palladium oxidation, intramolecular C(sp2)-H activation by a transient C(sp3)-Pd(IV) species, and selective carbon-carbon (C-C) bond-forming reductive elimination from a high-valent five-membered palladacycle is proposed to account for the reaction outcome. Kinetically competent oxidation of alkylPd(II) to alkylPd(IV) species is important to avoid the formation of a Heck adduct. The reaction forges two C-C bonds of the cyclobutene core and is compatible with a wide range of functional groups. No chelating bidentate directing group in the alkene part is needed for this transformation.
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Affiliation(s)
- Takuji Fujii
- Laboratory of Synthesis and Natural Products (LSPN), Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH5304, CH-1015 Lausanne, Switzerland
| | - Simone Gallarati
- Laboratory for Computational Molecular Design (LCMD), Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Clémence Corminboeuf
- Laboratory for Computational Molecular Design (LCMD), Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Qian Wang
- Laboratory of Synthesis and Natural Products (LSPN), Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH5304, CH-1015 Lausanne, Switzerland
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products (LSPN), Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, BCH5304, CH-1015 Lausanne, Switzerland
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26
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Fan L, Cao K, Hu H, Ma J, Peng Q, Li X, Huang Y, Yang J. Low‐dielectric silylbutylene‐benzocyclobutene resin with photoactive silacyclobutane groups via acyclic diene metathesis polymerization. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Li Fan
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
- School of National Defense Science and Technology Southwest University of Science and Technology Mianyang China
| | - Ke Cao
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
| | - Huan Hu
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
| | - Jiajun Ma
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
| | - Qiuxia Peng
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
| | - Xian Li
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
| | - Yawen Huang
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
| | - Junxiao Yang
- State Key Laboratory of Environmental‐friendly Energy Materials School of Material Science and Engineering, Southwest University of Science and Technology Mianyang China
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27
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Shi Q, Peng Q, Wu S, Long Q, Deng Y, Huang Y, Ma J, Yang J. Benzocyclobutene‐containing Carbosilane Monomers as a Route to Low‐
κ
Dielectric and Low Dielectric Loss Materials. ChemistrySelect 2022. [DOI: 10.1002/slct.202104413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Qingyu Shi
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Qiuxia Peng
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Song Wu
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Quan Long
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Yueting Deng
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Yawen Huang
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Jiajun Ma
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
| | - Junxiao Yang
- State Key Laboratory of Environment-friendly Energy Materials &School of Material Science and Engineering Southwest University of Science and Technology 59 Qinglong Road Mianyang Sichuan 621010 P. R. China
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28
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Przydacz A, Topolska A, Skrzyńska A, Albrecht Ł. NHC‐catalyzed 1,4‐elimination in the dearomative activation of 3‐furaldehydes towards (4+2)‐cycloadditions. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202101338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Cao S, Li J, Yan T, Han J, He Z. UV light-driven asymmetric vinylogous aldol reaction of isatins with 2-alkylbenzophenones and enantioselective synthesis of 3-hydroxyoxindoles. Org Chem Front 2022. [DOI: 10.1039/d1qo01555a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A UV light-driven enantioselective synthesis of 3-hydroxyoxindoles is reported for the first time.
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Affiliation(s)
- Shixuan Cao
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jiatian Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Taishan Yan
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jie Han
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhengjie He
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
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30
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Provencher PA, Hoskin JF, Wong JJ, Chen X, Yu JQ, Houk KN, Sorensen EJ. Pd(II)-Catalyzed Synthesis of Benzocyclobutenes by β-Methylene-Selective C(sp 3)-H Arylation with a Transient Directing Group. J Am Chem Soc 2021; 143:20035-20041. [PMID: 34817163 DOI: 10.1021/jacs.1c09368] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Methylene-selective C-H functionalization is a significant hurdle that remains to be addressed in the field of Pd(II) catalysis. We report a Pd(II)-catalyzed synthesis of benzocyclobutenes by methylene-selective C(sp3)-H arylation of ketones. The reaction utilizes glycine as a transient directing group and a 2-pyridone ligand, which may govern the methylene selectivity by making intimate molecular associations with the substrate during concerted metalation-deprotonation. This reaction is shown to be highly selective for intramolecular methylene C(sp3)-H arylation, thus enabling sequential C(sp3)-H functionalization.
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Affiliation(s)
- Philip A Provencher
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - John F Hoskin
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Jonathan J Wong
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Xiangyang Chen
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Erik J Sorensen
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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31
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400 076 India
| | | | - Yellaiah Tangella
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400 076 India
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32
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Construction of poly-N-heterocyclic scaffolds via the controlled reactivity of Cu-allenylidene intermediates. Commun Chem 2021; 4:158. [PMID: 36697740 PMCID: PMC9814594 DOI: 10.1038/s42004-021-00596-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/27/2021] [Indexed: 01/28/2023] Open
Abstract
Controlling the sequence of the three consecutive reactive carbon centres of Cu-allenylidene remains a challenge. One of the impressive achievements in this area is the Cu-catalyzed annulation of 4-ethynyl benzoxazinanones, which are transformed into zwitterionic Cu-stabilized allenylidenes that are trapped by interceptors to provide the annulation products. In principle, the reaction proceeds via a preferential γ-attack, while annulation reactions via an α- or β-attack are infrequent. Herein, we describe a method for controlling the annulation mode, by the manipulation of a CF3 or CH3 substituent, to make it proceed via either a γ-attack or an α- or β-attack. The annulation of CF3-substituted substrates with sulfamate-imines furnished densely functionalized N-heterocycles with excellent enantioselectivity via a cascade of an internal β-attack and an external α-attack. CH3-variants were transformed into different heterocycles that possess a spiral skeleton, via a cascade of an internal β-attack and a hydride α-migration followed by a Diels-Alder reaction.
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33
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Hou M, Xu M, Yang B, He H, Gao S. Exo-Selective and Enantioselective Photoenolization/Diels-Alder Reaction. Org Lett 2021; 23:7487-7491. [PMID: 34550708 DOI: 10.1021/acs.orglett.1c02719] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
An unusual exo-selective photoenolization/Diels-Alder reaction of electron-rich 2-methylbenzaldehydes and dienophiles containing a benzoyl group at its α position was reported herein. The chiral TADDOL-type ligand plays a key role in this process: (1) accelerating the reaction; (2) controlling the enantioselectivity; and (3) improving and tuning the diastereoselectivity of the reaction.
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Affiliation(s)
- Min Hou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
| | - Mengmeng Xu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
| | - Baochao Yang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
| | - Haibing He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China.,Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
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34
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Wu S, Xu J, Deng R, Wang H, Chi YR, Zheng P. Carbene-Catalyzed Activation of Formyl-phenylacetic Esters for Access to Chiral Dihydroisoquinolinones. Org Lett 2021; 23:7513-7517. [PMID: 34533322 DOI: 10.1021/acs.orglett.1c02676] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A carbene-catalyzed reaction to synthesize chiral dihydroisoquinolinones via an o-quinodimethane (o-QDM) intermediate is disclosed. o-QDM reacts with cyclic sulfonic imines via annulation to afford highly enantioenriched dihydroisoquinolinone products. ESI-HRMS studies suggest a stepwise Mannich addition and acylation reaction pathway, and the pathways of the catalytic and uncatalyzed background reactions are evaluated via DFT calculations.
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Affiliation(s)
- Shuquan Wu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Jun Xu
- Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China.,Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Rui Deng
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Hongling Wang
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
| | - Yonggui Robin Chi
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China.,Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Pengcheng Zheng
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China
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35
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Abstract
The merging of click chemistry with discrete photochemical processes has led to the creation of a new class of click reactions, collectively known as photoclick chemistry. These light-triggered click reactions allow the synthesis of diverse organic structures in a rapid and precise manner under mild conditions. Because light offers unparalleled spatiotemporal control over the generation of the reactive intermediates, photoclick chemistry has become an indispensable tool for a wide range of spatially addressable applications including surface functionalization, polymer conjugation and cross-linking, and biomolecular labeling in the native cellular environment. Over the past decade, a growing number of photoclick reactions have been developed, especially those based on the 1,3-dipolar cycloadditions and Diels-Alder reactions owing to their excellent reaction kinetics, selectivity, and biocompatibility. This review summarizes the recent advances in the development of photoclick reactions and their applications in chemical biology and materials science. A particular emphasis is placed on the historical contexts and mechanistic insights into each of the selected reactions. The in-depth discussion presented here should stimulate further development of the field, including the design of new photoactivation modalities, the continuous expansion of λ-orthogonal tandem photoclick chemistry, and the innovative use of these unique tools in bioconjugation and nanomaterial synthesis.
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Affiliation(s)
- Gangam Srikanth Kumar
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
| | - Qing Lin
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
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36
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Liebich VJ, Avrutina O, Habermann J, Hillscher LM, Langhans M, Meckel T, Biesalski M, Kolmar H. Toward Fabrication of Bioactive Papers: Covalent Immobilization of Peptides and Proteins. Biomacromolecules 2021; 22:2954-2962. [PMID: 34101458 DOI: 10.1021/acs.biomac.1c00354] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we report a novel two-step method for the covalent, site-directed, and efficient immobilization of proteins on lab-made paper sheets. First, paper fibers were modified with a peptidic anchor comprising enzyme recognition motifs. Four different conjugation strategies for peptide immobilization were evaluated with respect to reproducibility and fiber loading efficiency. After manufacturing of the peptide-preconditioned paper, oriented conjugation of the model protein tGFP containing a C-terminal recognition sequence for either sortase A or microbial transglutaminase was assessed semiquantitatively by fluorescence measurement and inspected by confocal laser scanning microscopy (CLSM). The two enzymes utilized for protein conjugation used the same oligoglycine peptide anchor, and both proved to be suitable for controlled oriented linkage of substrate proteins at physiological conditions.
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Affiliation(s)
- Valentina J Liebich
- Institute for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 4, 64287 Darmstadt, Germany
| | - Olga Avrutina
- Institute for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 4, 64287 Darmstadt, Germany
| | - Jan Habermann
- Institute for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 4, 64287 Darmstadt, Germany
| | - Laura M Hillscher
- Institute for Macromolecular and Paper Chemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany.,Merck Lab @ TU Darmstadt, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany
| | - Markus Langhans
- Institute for Macromolecular and Paper Chemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany
| | - Tobias Meckel
- Institute for Macromolecular and Paper Chemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany
| | - Markus Biesalski
- Institute for Macromolecular and Paper Chemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany.,Merck Lab @ TU Darmstadt, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany
| | - Harald Kolmar
- Institute for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Alarich-Weiss-Str. 4, 64287 Darmstadt, Germany.,Merck Lab @ TU Darmstadt, Technical University of Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany
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37
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Zhou L, Liu L. Highly enantioselective tandem cycloisomerization/Diels-Alder reaction of 2-(1-alkynyl)-2-alken-1-ones and enals: dual catalysis with platinum and amines. Chem Commun (Camb) 2021; 57:5690-5693. [PMID: 33982035 DOI: 10.1039/d1cc02080c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Herein, we disclosed a highly efficient strategy of enantioselective synthesis of 2,3-furan-fused carbocycles bearing three-contiguous stereocenters. This transformation is catalyzed by dual catalysis of PtCl4/chiral amines via tandem dehydrogenative annulation/Diels-Alder reaction of 2-(1-alkynyl)-2-alken-1-ones and enals. The in situ generation of the furan-based ortho-quinodimethane intermediates and the iminium activation of enals are crucial to this transformation.
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Affiliation(s)
- Liejin Zhou
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road Shanghai, 200241, P. R. China. and Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, 688 Yingbin Road, Jinhua, 321004, P. R. China
| | - Lu Liu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road Shanghai, 200241, P. R. China. and Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, Shanghai 200062, P. R. China
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38
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Hashikawa Y, Li H, Murata Y. Reactions of C 60 with Pyridazine and Phthalazine. Chemistry 2021; 27:7507-7511. [PMID: 33797148 DOI: 10.1002/chem.202100711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Indexed: 01/14/2023]
Abstract
Cage-opened bisfulleroids are one of suitable building blocks for making a large hole on fullerenes. This work focuses on the Diels-Alder reaction of C60 with azines, among synthetic methods developed thus far, to provide bisfulleroids. Surprisingly, the computational study predicted that the reaction proceeds with normal electron demand in contrast to hitherto considered inverse-electron-demand pathway. The benzoannulation to the pyridazine ring, i. e., phthalazine, resulted in the remarkably shortened reaction time due to the better interaction between the HOMO of phthalazine and the LUMO of C60 as well as stronger 2,3-diaza-1,3-butadiene character in the phthalazine as confirmed crystallographically. Contrary to expectations, the benzobisfulleroid was converted into corresponding orifice-enlarged derivative via the photooxygenation slightly faster than the fulleroid derived from pyridazine.
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Affiliation(s)
- Yoshifumi Hashikawa
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Hui Li
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Yasujiro Murata
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
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39
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Zhao M, Wang Y, Wang ZL, Xu JL, Dai KY, Xu YH. Copper-Catalyzed Chemoselective Silylative Cyclization of 2,2'-Diethynylbiaryl Derivatives. Org Lett 2021; 23:3859-3863. [PMID: 33970651 DOI: 10.1021/acs.orglett.1c00968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this protocol, copper-catalyzed diverse silylative carbocyclization reactions of 2,2'-diethynylbiaryl derivatives with silaboronate were reported. Three new and novel types of domino reactions for the copper-catalyzed transformation of silaboronate were discovered. The corresponding cyclobuta[l]phenanthrene, bis((silyl)methyl)phenanthrene, and silyl-substituted exocyclic diene products were chemoselectively formed with high efficiency.
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Affiliation(s)
- Meng Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Ying Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Zi-Lu Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Jian-Lin Xu
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Kai-Yang Dai
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Yun-He Xu
- Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.,State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
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40
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Feist F, Walden SL, Alves J, Kunz SV, Micallef AS, Brock AJ, McMurtrie JC, Weil T, Blinco JP, Barner‐Kowollik C. Wellenlängengesteuerte photochemische Synthese von Phenalendiimiden. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Florian Feist
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- Max-Planck-Institut für Polymerforschung (MPIP) Ackermannweg 10 55128 Mainz Deutschland
- Makromolekulare Architekturen Institut für technische Chemie and Polymerchemie Karlsruhe Institut für Technologie (KIT) Engesserstraße 18 76131 Karlsruhe Deutschland
- Institut für Nanotechnologie Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Sarah L. Walden
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - Jessica Alves
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - Susanna V. Kunz
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - Aaron S. Micallef
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - Aidan J. Brock
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - John C. McMurtrie
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - Tanja Weil
- Max-Planck-Institut für Polymerforschung (MPIP) Ackermannweg 10 55128 Mainz Deutschland
| | - James P. Blinco
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
| | - Christopher Barner‐Kowollik
- Centre for Materials Science Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St. Brisbane QLD 4000 Australien
- Makromolekulare Architekturen Institut für technische Chemie and Polymerchemie Karlsruhe Institut für Technologie (KIT) Engesserstraße 18 76131 Karlsruhe Deutschland
- Institut für Nanotechnologie Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
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41
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Stathouraki MM, Pantazidis C, Mygiakis E, Avgeropoulos A, Sakellariou G. Functionalization of Single-Walled Carbon Nanotubes with End-Capped Polystyrene via a Single-Step Diels-Alder Cycloaddition. Polymers (Basel) 2021; 13:1169. [PMID: 33917281 PMCID: PMC8038725 DOI: 10.3390/polym13071169] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 03/30/2021] [Accepted: 04/02/2021] [Indexed: 11/17/2022] Open
Abstract
A facile, single-step, [4+2] Diels-Alder cycloaddition reaction for the surface functionalization of single-walled carbon nanotubes (SWNTs) with end-capped polystyrene chains is presented. The thermal cycloaddition reaction took place at high temperature (~230 °C) without any catalyst between the sp2 network of carbon nanotubes, which acted as dienophile, and the diphenylethylene cyclobutene (DPE-CB) terminal group of the polystyrene chain. Anionic polymerization was employed for the synthesis of the polystyrene macromolecule, and successful and quantitative end-capping reaction with the DPE-CB molecule was confirmed by matrix-assisted laser desorption/ionization time of flight mass spectroscopy. Thermogravimetric analysis revealed the wt % of the grafted macromolecule on the CNT surface as well as the grafting density of the polymer chains on the SWNTs (0.027 chains nm-2). Direct evidence for the surface functionalization and the presence of thin polystyrene film was obtained by transmission electron microscopy (TEM) and by atomic force microscopy (AFM).
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Affiliation(s)
- Maria-Malvina Stathouraki
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece; (M.-M.S.); (C.P.); (E.M.)
| | - Christos Pantazidis
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece; (M.-M.S.); (C.P.); (E.M.)
| | - Emmanouil Mygiakis
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece; (M.-M.S.); (C.P.); (E.M.)
| | - Apostolos Avgeropoulos
- Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece;
| | - Georgios Sakellariou
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece; (M.-M.S.); (C.P.); (E.M.)
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42
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Qi SS, Yin H, Wang YF, Wang CJ, Han HT, Man TT, Xu DQ. Catalytic Asymmetric Conjugate Addition/Hydroalkoxylation Sequence: Expeditious Access to Enantioenriched Eight-Membered Cyclic Ether Derivatives. Org Lett 2021; 23:2471-2476. [PMID: 33733793 DOI: 10.1021/acs.orglett.1c00392] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A sequential enantioselective conjugate addition/hydroalkoxylation between in situ generated ortho-quinomethanes and ynones by combining bifunctional squaramide and DBU catalysis has been developed. A variety of eight-membered cyclic ethers with two contiguous tertiary stereocenters were obtained in high yields with excellent stereoselectivities. This reaction not only provides a new strategy for constructing enantioenriched eight-membered cyclic ethers but also demonstrates the practicability of ynones as C4-syntons for the synthesis of chiral medium-membered rings.
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Affiliation(s)
- Suo-Suo Qi
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Hao Yin
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Yi-Feng Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Chao-Jie Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Hong-Te Han
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Tong-Tong Man
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Dan-Qian Xu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
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43
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Feist F, Walden SL, Alves J, Kunz SV, Micallef AS, Brock AJ, McMurtrie JC, Weil T, Blinco JP, Barner-Kowollik C. Wavelength-Gated Photochemical Synthesis of Phenalene Diimides. Angew Chem Int Ed Engl 2021; 60:10402-10408. [PMID: 33571392 PMCID: PMC8251713 DOI: 10.1002/anie.202016632] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/29/2021] [Indexed: 02/06/2023]
Abstract
Herein, we pioneer a wavelength‐gated synthesis route to phenalene diimides. Consecutive Diels–Alder reactions of methylisophthalaldehydes and maleimides afford hexahydro‐phenalene‐1,6‐diol diimides via 5‐formyl‐hexahydro‐benzo[f]isoindoles as the intermediate. Both photoreactions are efficient (82–99 % yield) and exhibit excellent diastereoselectivity (62–98 % d.r.). The wavelength‐gated nature of the stepwise reaction enables the modular construction of phenalene diimide scaffolds by choice of substrate and wavelength. Importantly, this synthetic methodology opens a facile avenue to a new class of persistent phenalenyl diimide neutral radicals, constituting a versatile route to spin‐active molecules.
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Affiliation(s)
- Florian Feist
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,Max Planck Institute for Polymer Research (MPIP), Ackermannweg 10, 55128, Mainz, Germany.,Macromolecular Architectures, Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 18, 76131, Karlsruhe, Germany.,Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Sarah L Walden
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - Jessica Alves
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - Susanna V Kunz
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - Aaron S Micallef
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - Aidan J Brock
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - John C McMurtrie
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - Tanja Weil
- Max Planck Institute for Polymer Research (MPIP), Ackermannweg 10, 55128, Mainz, Germany
| | - James P Blinco
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia
| | - Christopher Barner-Kowollik
- Centre for Materials Science, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George St., Brisbane, QLD, 4000, Australia.,Macromolecular Architectures, Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 18, 76131, Karlsruhe, Germany.,Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
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44
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Adachi K, Hirose S, Ueda Y, Uekusa H, Hamura T. Thermodynamically Stable o-Quinodimethane: Synthesis, Structure, and Reactivity. Chemistry 2021; 27:3665-3669. [PMID: 33159368 DOI: 10.1002/chem.202004510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 10/30/2020] [Indexed: 11/07/2022]
Abstract
Thermal isomerization of cyclobutaphenanthrene to o-quinodimethane was investigated. Sterically congested substituents or electron-donating substituents on the four-membered ring promoted the ring-opening, affording o-quinodimethane in a relatively stable form. Isolation of the newly prepared o-quinodimethane allowed its structural elucidation and investigation of its potential reactivities. Dual [4+2] cycloaddition of an aryne and o-quinodimethane afforded tetrabenzopentacene, demonstrating the synthetic application of the isolated compound.
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Affiliation(s)
- Kazuhiko Adachi
- Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan
| | - Shunsuke Hirose
- Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan
| | - Yasuyuki Ueda
- Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan
| | - Hidehiro Uekusa
- Department of Chemistry, School of Science, Tokyo Institute of Technology, Ookayama 2, Meguro-ku, Tokyo, 152-8551, Japan
| | - Toshiyuki Hamura
- Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan
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45
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Zuzak R, Stoica O, Blieck R, Echavarren AM, Godlewski S. On-Surface Synthesis and Intermolecular Cycloadditions of Indacenoditetracenes, Antiaromatic Analogues of Undecacene. ACS NANO 2021; 15:1548-1554. [PMID: 33346643 DOI: 10.1021/acsnano.0c08995] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The formation of s-indaceno[1,2-b:5,6-b']ditetracene and as-indaceno[2,3-b:6,7-b']ditetracene containing indenofluorene cores from a common precursor has been achieved by a dehydrogenative surface-assisted cyclization on Au(111) and confirmed by bond-resolved non-contact atomic force microscopy. On-surface generated as-indaceno[2,3-b:6,7-b']ditetracenes undergo fusion, which leads to T-shaped adducts by an intermolecular cycloaddition. The same type of cycloaddition, which has no parallel in solution chemistry, has been observed between as-indaceno[2,3-b:6,7-b']ditetracene and pentacene or octacene. These examples of surface-assisted cycloaddition provide perspectives for the rational design and synthesis of molecular nanostructures.
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Affiliation(s)
- Rafal Zuzak
- Centre for Nanometer-Scale Science and Advanced Materials, NANOSAM, Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, PL 30-348 Krakow, Poland
| | - Otilia Stoica
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007 Tarragona, Spain
- Departament de Química Orgànica i Analítica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Rémi Blieck
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Antonio M Echavarren
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007 Tarragona, Spain
- Departament de Química Orgànica i Analítica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Szymon Godlewski
- Centre for Nanometer-Scale Science and Advanced Materials, NANOSAM, Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, PL 30-348 Krakow, Poland
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46
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Bresien J, Michalik D, Schulz A, Villinger A, Zander E. Azadiphosphaindane-1,3-diyls: A Class of Resonance-Stabilized Biradicals. Angew Chem Int Ed Engl 2021; 60:1507-1512. [PMID: 33038288 PMCID: PMC7839750 DOI: 10.1002/anie.202011886] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/06/2020] [Indexed: 01/12/2023]
Abstract
Conversion of 1,2-bis(dichlorophosphino)benzene with sterically demanding primary amines led to the formation of 1,3-dichloro-2-aza-1,3-diphosphaindanes of the type C6 H4 (μ-PCl)2 N-R. Reduction yielded the corresponding 2-aza-1,3-diphosphaindane-1,3-diyls (1), which can be described as phosphorus-centered singlet biradical(oid)s. Their stability depends on the size of the substituent R: While derivatives with R=Dmp (2,6-dimethylphenyl) or Ter (2,6-dimesitylphenyl) underwent oligomerization, the derivative with very bulky R=tBu Bhp (2,6-bis(benzhydryl)-4-tert-butylphenyl) was stable with respect to oligomerization in its monomeric form. Oligomerization involved activation of the fused benzene ring by a second equivalent of the monomeric biradical and can be regarded as formal [2+2] (poly)addition reaction. Calculations indicate that the biradical character in 1 is comparable with literature-known P-centered biradicals. Ring-current calculations show aromaticity within the entire ring system of 1.
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Affiliation(s)
- Jonas Bresien
- Institut für ChemieUniversität RostockAlbert-Einstein-Straße 3a18059RostockGermany
| | - Dirk Michalik
- Institut für ChemieUniversität RostockAlbert-Einstein-Straße 3a18059RostockGermany
- Leibniz-Institut für Katalyse e.V.Albert-Einstein-Straße 29a18059RostockGermany
| | - Axel Schulz
- Institut für ChemieUniversität RostockAlbert-Einstein-Straße 3a18059RostockGermany
- Leibniz-Institut für Katalyse e.V.Albert-Einstein-Straße 29a18059RostockGermany
| | - Alexander Villinger
- Institut für ChemieUniversität RostockAlbert-Einstein-Straße 3a18059RostockGermany
| | - Edgar Zander
- Institut für ChemieUniversität RostockAlbert-Einstein-Straße 3a18059RostockGermany
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47
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Bresien J, Michalik D, Schulz A, Villinger A, Zander E. Azadiphosphaindan‐1,3‐diyle: Eine Gruppe von resonanzstabilisierten Biradikalen. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202011886] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jonas Bresien
- Institut für Chemie Universität Rostock Albert-Einstein-Straße 3a 18059 Rostock Deutschland
| | - Dirk Michalik
- Institut für Chemie Universität Rostock Albert-Einstein-Straße 3a 18059 Rostock Deutschland
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Deutschland
| | - Axel Schulz
- Institut für Chemie Universität Rostock Albert-Einstein-Straße 3a 18059 Rostock Deutschland
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Deutschland
| | - Alexander Villinger
- Institut für Chemie Universität Rostock Albert-Einstein-Straße 3a 18059 Rostock Deutschland
| | - Edgar Zander
- Institut für Chemie Universität Rostock Albert-Einstein-Straße 3a 18059 Rostock Deutschland
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48
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Tang TM, Liu M, Wu H, Gou T, Hu X, Wang BQ, Hu P, Song F, Huang G. Pd-Catalyzed tandem C–C/C–O/C–H single bond cleavage of 3-allyloxybenzocyclobutenols. Org Chem Front 2021. [DOI: 10.1039/d0qo01619e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Pd-catalyzed skeletal rearrangement of 3-allyloxybenzocyclobutenols was achieved, which involved tandem C–C/C–O bond cleavage and C–H allylic substitution.
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Affiliation(s)
- Tian-Mu Tang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Min Liu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Hongli Wu
- Department of Chemistry
- School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Sciences
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Ting Gou
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Xi Hu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Bi-Qin Wang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Ping Hu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Feijie Song
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Genping Huang
- Department of Chemistry
- School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Sciences
- Tianjin University
- Tianjin 300072
- P. R. China
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49
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Gao J, Feng J, Du D. Generation of azolium dienolates as versatile nucleophilic synthons via N-heterocyclic carbene catalysis. Org Chem Front 2021. [DOI: 10.1039/d1qo01127h] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The recent advances in N-heterocyclic carbene (NHC)-catalyzed generation of azolium dienolates from different precursors and their synthetic applications for the construction of various valuable molecules are summarized comprehensively in this review.
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Affiliation(s)
- Jian Gao
- Department of Chemistry, State Key Laboratory of Natural Medicines, China Pharmaceutical University, 210009, P. R. China
| | - Jie Feng
- Department of Chemistry, State Key Laboratory of Natural Medicines, China Pharmaceutical University, 210009, P. R. China
| | - Ding Du
- Department of Chemistry, State Key Laboratory of Natural Medicines, China Pharmaceutical University, 210009, P. R. China
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50
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Alves J, Krappitz T, Feist F, Blinco JP, Barner-Kowollik C. Combining Photodeprotection and Ligation into a Dual-Color Gated Reaction System. Chemistry 2020; 26:16985-16989. [PMID: 32839970 PMCID: PMC7894288 DOI: 10.1002/chem.202003546] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/20/2020] [Indexed: 12/31/2022]
Abstract
We report a photochemical reaction system which requires activation by two colors of light. Specifically, a dual wavelength gated system is established by fusing the visible light mediated deprotection of a dithioacetal with the UV light activated Diels–Alder reaction of an o‐methylbenzaldehyde with n‐ethylmaleimide. Critically, both light sources are required to achieve the Diels–Alder adduct, irradiation with visible or UV light alone does not lead to the target product. The introduced dual gated photochemical system is particularly interesting for application in light driven 3D printing, where two color wavelength activated photoresists may become reality.
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Affiliation(s)
- Jessica Alves
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Tim Krappitz
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Florian Feist
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - James P Blinco
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Christopher Barner-Kowollik
- Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia.,Institute of Nanotechnology, INT, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
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