1
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Glotz G, Drusgala M, Hamm F, Fischer RC, Došlić N, Kelterer AM, Gescheidt G, Haas M. Wavelength-dependent rearrangements of an α-dione chromophore: a chemical pearl in a bis(hypersilyl) oyster. Chem Sci 2024; 15:4427-4433. [PMID: 38516088 PMCID: PMC10952070 DOI: 10.1039/d4sc00064a] [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: 01/04/2024] [Accepted: 02/14/2024] [Indexed: 03/23/2024] Open
Abstract
The symmetric bissilyl-dione 3 reveals two well-separated n → π* absorption bands at λmax = 637 nm (ε = 140 mol-1 dm3 cm-1) and 317 nm (ε = 2460 mol-1 dm3 cm-1). Whereas excitation of 3 at λ = 360/365 nm affords an isolable siloxyketene 4 in excellent yields, irradiation at λ = 590/630 nm leads to the stereo-selective and quantitative formation of the siloxyrane 5. These remarkable wavelength-dependent rearrangements are based on the electronic and steric properties provided by the hypersilyl groups. While the siloxyketene 4 is formed via a hitherto unknown 1,3-hypersilyl migration via the population of a second excited singlet state (S2, λmax = 317 nm, a rare case of anti-Kasha reactivity), the siloxyrane 5 emerges from the first excited triplet state (T1via S1λmax = 637 nm). These distinct reaction pathways can be traced back to specific energy differences between the S2, S1 and T1, an electronic consequence of the bissilyl substited α-dione (the "pearl"). The hypersilyl groups act as protective ''oyster shell", which are responsible for the clean formation of 4 and 5 basically omitting side products. We describe novel synthetic pathways to achieve hypersilyl substitution (3) and report an in-depth investigation of the photorearrangements of 3 using UV/vis, in situ IR, NMR spectroscopy and theoretical calculations.
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Affiliation(s)
- Gabriel Glotz
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9/II 8010 Graz Austria
| | - Manfred Drusgala
- Institute of Inorganic Chemistry, Graz University of Technology Stremayrgasse 9/IV 8010 Graz Austria
| | - Florian Hamm
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9/II 8010 Graz Austria
| | - Roland C Fischer
- Institute of Inorganic Chemistry, Graz University of Technology Stremayrgasse 9/IV 8010 Graz Austria
| | - Nađa Došlić
- Department of Physical Chemistry, Ruđer Bošković Institute Bijenička 54 Zagreb Croatia
| | - Anne-Marie Kelterer
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9/II 8010 Graz Austria
| | - Georg Gescheidt
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9/II 8010 Graz Austria
| | - Michael Haas
- Institute of Inorganic Chemistry, Graz University of Technology Stremayrgasse 9/IV 8010 Graz Austria
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2
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Morales-Monarca G, Gnecco D, Terán JL. Diastereoselective Functionalization of chiral N‐acyl‐1,3‐oxazolidines and Their Applications in the Synthesis of bioactive molecules. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Gerardo Morales-Monarca
- Benemérita Universidad Autónoma de Puebla: Benemerita Universidad Autonoma de Puebla Science Institute MEXICO
| | - Dino Gnecco
- Benemérita Universidad Autónoma de Puebla: Benemerita Universidad Autonoma de Puebla Science Institute MEXICO
| | - Joel L. Terán
- Benem�rita Universidad Aut�noma de Puebla Laboratorio de S�ntesis Org�nica Avenida San Claudio, Colonia San ManuelEdificio IC-9 Complejo de Ciencias,Ciudad Universitaria 72570 Puebla MEXICO
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3
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Chandrasekaran R, Pulikkottil FT, Elama KS, Rasappan R. Direct synthesis and applications of solid silylzinc reagents. Chem Sci 2021; 12:15719-15726. [PMID: 35003603 PMCID: PMC8654096 DOI: 10.1039/d1sc06038d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 11/19/2021] [Indexed: 01/29/2023] Open
Abstract
The increased synthetic utility of organosilanes has motivated researchers to develop milder and more practical synthetic methods. Silylzinc reagents, which are typically the most functional group tolerant, are notoriously difficult to synthesize because they are obtained by a pyrophoric reaction of silyllithium, particularly Me3SiLi which is itself prepared by the reaction of MeLi and disilane. Furthermore, the dissolved LiCl in silylzinc may have a detrimental effect. A synthetic method that can avoid silyllithium and involves a direct synthesis of silylzinc reagents from silyl halides is arguably the simplest and most economical strategy. We describe, for the first time, the direct synthesis of PhMe2SiZnI and Me3SiZnI reagents by employing a coordinating TMEDA ligand, as well as single crystal XRD structures. Importantly, they can be obtained as solids and stored for longer periods at 4 °C. We also demonstrate their significance in cross-coupling of various free alkyl/aryl/alkenyl carboxylic acids with broader functional group tolerance and API derivatives. The general applicability and efficiency of solid Me3SiZnI are shown in a wide variety of reactions including alkylation, arylation, allylation, 1,4-addition, acylation and more.
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Affiliation(s)
- Revathi Chandrasekaran
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
| | - Feba Thomas Pulikkottil
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
| | - Krishna Suresh Elama
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
| | - Ramesh Rasappan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram Kerala 695551 India
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4
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Wang X, Liu F, Li Y, Yan Z, Qiang Q, Rong Z. Recent Advances in the Synthesis of Acylsilanes. ChemCatChem 2020. [DOI: 10.1002/cctc.202000750] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Xuchao Wang
- Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 P.R. China
| | - Feipeng Liu
- Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 P.R. China
- Key Laboratory for Organic Electronics and Information Displays Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications 9 Wenyuan Road Nanjing 210023 P.R. China
| | - Yongjie Li
- College of Chemistry Liaoning University Shenyang 110036 P.R. China
| | - Zijuan Yan
- Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 P.R. China
| | - Qing Qiang
- Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 P.R. China
| | - Zi‐Qiang Rong
- Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 P.R. China
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5
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Zhu JL, Laws SW, Rourke MJ, Scheidt KA. Radical coupling of β-ketoesters and amides promoted by Brønsted/Lewis acids. GREEN SYNTHESIS AND CATALYSIS 2020; 1:70-74. [PMID: 34485961 PMCID: PMC8411943 DOI: 10.1016/j.gresc.2020.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Recent advances in photocatalysis have enabled radical methods with complementary chemoselectivity to established two electron bond forming approaches. While this radical strategy has previously been limited to substrates with favorable redox potentials, Brønsted/Lewis acid activation has emerged as a means of facilitating otherwise difficult reductions. We report herein our investigations into the Lewis acid-promoted redox activation of β-ketocarbonyls in a model photocatalytic radical alkylation reaction. Rapid evaluation of substrates and reactions conditions was achieved by high throughput experimentation using 96-well plate photoreactors.
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Affiliation(s)
- Joshua L. Zhu
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, IL 60208, United States
| | - Stephen W. Laws
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, IL 60208, United States
| | - Michael J. Rourke
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, IL 60208, United States
| | - Karl. A. Scheidt
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, IL 60208, United States
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6
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Maskeri MA, Schrader ML, Scheidt KA. A Sequential Umpolung/Enzymatic Dynamic Kinetic Resolution Strategy for the Synthesis of γ-Lactones. Chemistry 2020; 26:5794-5798. [PMID: 32084294 PMCID: PMC7210063 DOI: 10.1002/chem.202000747] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Indexed: 01/30/2023]
Abstract
Combining biological and small-molecule catalysts under a chemoenzymatic manifold presents a series of significant advantages to the synthetic community. We report herein the successful development of a two-step/single flask synthesis of γ-lactones through the merger of Umpolung catalysis with a ketoreductase-catalyzed dynamic kinetic resolution, reduction, and cyclization. This combined approach delivers highly enantio- and diastereoenriched heterocycles and demonstrates the feasibility of integrating NHC catalysis with enzymatic processes.
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Affiliation(s)
- Mark A. Maskeri
- Department of Chemistry, Center for Molecular Innovation and Drug, Discovery, Northwestern University, Silverman Hall, Evanston, Illinois 60208
| | - Malte L. Schrader
- Department of Chemistry, Center for Molecular Innovation and Drug, Discovery, Northwestern University, Silverman Hall, Evanston, Illinois 60208
| | - Karl A. Scheidt
- Department of Chemistry, Center for Molecular Innovation and Drug, Discovery, Northwestern University, Silverman Hall, Evanston, Illinois 60208
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7
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Ganesh Kumar M, Veeresh K, Nalawade SA, Nithun RV, Gopi HN. Direct Transformation of N-Protected α,β-Unsaturated γ-Amino Amides into γ-Lactams through a Base-Mediated Molecular Rearrangement. J Org Chem 2019; 84:15145-15153. [PMID: 31657563 DOI: 10.1021/acs.joc.9b01936] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Here, we are reporting a single-step transformation of N-protected α,β-unsaturated γ-amino amides into 5,5-disubstituted γ-lactams through a base-mediated new molecular rearrangement. In contrast to the known N- to C(O) cyclization of saturated γ-amino acids into corresponding γ-lactams, the new rearrangement involves the cyclization between N-terminal Cγ- to C-terminal amide N. The cyclization process was initiated by the migration of double bond from α,β → β,γ position. The enamine-imine tautomerization of the new β,γ-double bond and subsequent 5-exo-trig cyclization of terminal amide leads to the formation of N-protected 5,5-disubstituted γ-lactam. The structures of various γ-lactams obtained from the rearrangement were studied in single crystals. Overall, the results reported here demonstrate the facile and single-step transformation of N-protected α,β-unsaturated γ-amino amides into γ-lactams and provided an excellent opportunity to construct small-molecule peptidomimetics.
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Affiliation(s)
- Mothukuri Ganesh Kumar
- Department of Chemistry , Indian Institute of Science Education and Research , Dr. Homi Bhabha Road , Pune 411 008 , India
| | - Kuruva Veeresh
- Department of Chemistry , Indian Institute of Science Education and Research , Dr. Homi Bhabha Road , Pune 411 008 , India
| | - Sachin A Nalawade
- Department of Chemistry , Indian Institute of Science Education and Research , Dr. Homi Bhabha Road , Pune 411 008 , India
| | - Raj V Nithun
- Department of Chemistry , Indian Institute of Science Education and Research , Dr. Homi Bhabha Road , Pune 411 008 , India
| | - Hosahudya N Gopi
- Department of Chemistry , Indian Institute of Science Education and Research , Dr. Homi Bhabha Road , Pune 411 008 , India
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8
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Feng J, Oestreich M. Tertiary α‐Silyl Alcohols by Diastereoselective Coupling of 1,3‐Dienes and Acylsilanes Initiated by Enantioselective Copper‐Catalyzed Borylation. Angew Chem Int Ed Engl 2019; 58:8211-8215. [DOI: 10.1002/anie.201903174] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Jian‐Jun Feng
- Institut für Chemie Technische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
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9
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Feng J, Oestreich M. Tertiäre α‐Silylalkohole mittels diastereoselektiver Kupplung von 1,3‐Dienen und Acylsilanen, eingeleitet durch enantioselektive kupferkatalysierte Borylierung. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903174] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jian‐Jun Feng
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
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10
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Suć Sajko J, Ljoljić Bilić V, Kosalec I, Jerić I. Multicomponent Approach to a Library of N-Substituted γ-Lactams. ACS COMBINATORIAL SCIENCE 2019; 21:28-34. [PMID: 30563326 DOI: 10.1021/acscombsci.8b00147] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The γ-lactam motif is often found in naturally occurring compounds with diverse biological activities. We prepared a 28-member library of N-substituted γ-lactams following a single-pot, three-component Ugi reaction comprising bifunctional building block, l-glutamic acid methyl ester. The reaction tolerates structurally diverse carbonyl and isocyanide components providing a robust access to functionalized γ-lactams. Antimicrobial susceptibility testing, including agar well diffusion assay, serial microdilution broth assay, and antibiofilm activity testing, identified a potent compound with antibiofilm activity against Staphylococcus aureus ATCC 6538.
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Affiliation(s)
- Josipa Suć Sajko
- Ruđer Bošković Institute, Division of Organic Chemistry and Biochemistry, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Vanja Ljoljić Bilić
- Department of Microbiology, Faculty of Pharmacy and Biochemistry, University of Zagreb, Schrottova 39, 10000 Zagreb, Croatia
| | - Ivan Kosalec
- Department of Microbiology, Faculty of Pharmacy and Biochemistry, University of Zagreb, Schrottova 39, 10000 Zagreb, Croatia
| | - Ivanka Jerić
- Ruđer Bošković Institute, Division of Organic Chemistry and Biochemistry, Bijenička cesta 54, 10000 Zagreb, Croatia
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11
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Tang F, Ma PJ, Yao Y, Xu YJ, Lu CD. Divergent synthesis of polysubstituted cyclopropanes and β-silyoxy imidates via switchable additions of N-tert-butanesulfinylimidates to acylsilanes. Chem Commun (Camb) 2019; 55:3777-3780. [DOI: 10.1039/c9cc00963a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A switchable addition of N-tert-butanesulfinylimidates to acylsilanes leads to divergent synthesis of polysubstituted cyclopropanes and β-silyloxy imidates.
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Affiliation(s)
- Fan Tang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Peng-Ju Ma
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yun Yao
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
- China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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12
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Affiliation(s)
- L. Reginald Mills
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St George Street M5S 3H6 Toronto, Ontario Canada
| | - Sophie A. L. Rousseaux
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St George Street M5S 3H6 Toronto, Ontario Canada
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13
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Cao W, Tan D, Lee R, Tan CH. Enantioselective 1,2-Anionotropic Rearrangement of Acylsilane through a Bisguanidinium Silicate Ion Pair. J Am Chem Soc 2018; 140:1952-1955. [DOI: 10.1021/jacs.7b13056] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Weidi Cao
- Division
of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Davin Tan
- Division
of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
- Division
of Science and Math, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372
| | - Richmond Lee
- Division
of Science and Math, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372
| | - Choon-Hong Tan
- Division
of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
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14
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Copper-Catalyzed Intermolecular Aminoalkylation of Alkenes with α-Bromoalkyl Esters and Amines toward Pyrrolidin-2-ones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700365] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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15
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Jiang J, Liu H, Lu CD, Xu YJ. Diethyl Phosphite Initiated Coupling of α-Ketoesters with Imines for Synthesis of α-Phosphonyloxy-β-amino Acid Derivatives and Aziridine-2-carboxylates. Org Lett 2016; 18:880-3. [DOI: 10.1021/acs.orglett.6b00273] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jin Jiang
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Hui Liu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Chong-Dao Lu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences and University of the Chinese Academy of Sciences, Urumqi 830011, China
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16
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Sun Z, Liu H, Zeng YM, Lu CD, Xu YJ. Silyllithium-Initiated Coupling of α-Ketoamides with tert-Butanesulfinylimines for Stereoselective Synthesis of Enantioenriched α-(Silyloxy)-β-amino Amides. Org Lett 2016; 18:620-3. [PMID: 26809848 DOI: 10.1021/acs.orglett.6b00006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A silyllithium-initiated coupling of α-ketoamides with tert-butanesulfinylimines was developed for the efficient, stereoselective synthesis of enantioenriched α-(silyloxy)-β-amino amides. Nucleophilic addition of silyllithium to α-ketoamides, followed by 1,2-Brook rearrangement, generates nucleophilic enolates, which are then intercepted by chiral imines to provide three-component coupling products. Use of α-ketoamides is critical for achieving high yields and diastereoselectivities in the resulting α-hydroxy-β-amino acid derivatives.
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Affiliation(s)
- Zhao Sun
- Department of Chemistry and Applied Chemistry, Changji University , Changji 831100, China
| | - Hui Liu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yong-Ming Zeng
- Department of Chemistry and Applied Chemistry, Changji University , Changji 831100, China
| | - Chong-Dao Lu
- Department of Chemistry and Applied Chemistry, Changji University , Changji 831100, China.,The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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17
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Lin CY, Ma PJ, Sun Z, Lu CD, Xu YJ. Carbamoyl anion-initiated cascade reaction for stereoselective synthesis of substituted α-hydroxy-β-amino amides. Chem Commun (Camb) 2016; 52:912-5. [DOI: 10.1039/c5cc08118a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A carbamoyl anion-initiated cascade reaction with acylsilanes and imines allows rapid construction of substituted α-hydroxy-β-amino amides in high yields with excellent diastereoselectivities.
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Affiliation(s)
- Chao-Yang Lin
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Peng-Ju Ma
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Zhao Sun
- Department of Chemistry and Applied Chemistry
- Changji University
- Changji 831100
- China
| | - Chong-Dao Lu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yan-Jun Xu
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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18
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Kiran Kumar Y, Ranjith Kumar G, Sridhar Reddy M. Hg/Pt-catalyzed conversion of bromo alkynamines/alkynols to saturated and unsaturated γ-butyrolactams/lactones via intramolecular electrophilic cyclization. Org Biomol Chem 2015; 14:1252-60. [PMID: 26647118 DOI: 10.1039/c5ob02125a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Convenient and general Hg(ii)/Pt(iv) catalyzed syntheses of γ-butyrolactams and α,β-unsaturated γ-butyrolactones/lactams are described via intramolecular electrophilic cyclizations of bromoalkynes with tosylamino and hydroxyl tethers. The reaction features the use of wet solvents, the exclusion of any base and additive, mild conditions and practical yields. We also synthesised few chiral lactams through this pathway. Additionally, it is shown that the NHTs group distanced further from the homopropargylic position assists regioselective bromoalkyne hydration to yield useful α-bromoketones. Furthermore, Boc protected bromo homo propargyl amines undergo 6-endo-dig cyclization through Boc oxygen to give bromomethylene substituted oxazinones.
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Affiliation(s)
- Yalla Kiran Kumar
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
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19
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Tan C, Chen W, Mu X, Chen Q, Gong J, Luo T, Yang Z. Synthetic Progress toward Azadirachtins. 2. Enantio- and Diastereoselective Synthesis of the Right-Wing Fragment of 11-epi-Azadirachtin I. Org Lett 2015; 17:2338-41. [DOI: 10.1021/acs.orglett.5b00831] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ceheng Tan
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Wei Chen
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Xinpeng Mu
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Qi Chen
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Jianxian Gong
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Tuoping Luo
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science
(BNLMS) and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Zhen Yang
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science
(BNLMS) and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
- Key
Laboratory of Marine Drugs, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
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20
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Tan Y, Yang XD, Liu WJ, Sun XW. Novel one-pot asymmetric cascade approach toward densely substituted enantioenriched α-methylene-γ-lactams. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.09.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Lin YW, Deng JC, Hsieh YZ, Chuang SC. One-pot formation of fluorescent γ-lactams having an α-phosphorus ylide moiety through three-component α(δ′)-Michael reactions of phosphines with an enyne and N-tosyl aldimines. Org Biomol Chem 2014; 12:162-70. [DOI: 10.1039/c3ob41811a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Ye LW, Shu C, Gagosz F. Recent progress towards transition metal-catalyzed synthesis of γ-lactams. Org Biomol Chem 2014; 12:1833-45. [DOI: 10.1039/c3ob42181c] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The scope of transition metal-catalyzed synthesis of functionalized γ-lactams has broadened tremendously in the last decade (see the picture). These metal-catalyzed processes are reviewed by highlighting their specificity and applicability, and the mechanistic rationale is presented where possible.
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Affiliation(s)
- Long-Wu Ye
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005, P. R. China
| | - Chao Shu
- Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005, P. R. China
| | - Fabien Gagosz
- Laboratoire de Synthèse Organique (DCSO)
- UMR 7652 CNRS/Ecole Polytechnique
- Ecole Polytechnique
- 91128 Palaiseau cedex, France
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23
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Jiang JL, Yao M, Lu CD. Efficient synthesis of α-quaternary α-hydroxy-β-amino esters via silyl glyoxylate-mediated three-component reactions. Org Lett 2013; 16:318-21. [PMID: 24308782 DOI: 10.1021/ol403388w] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient method has been developed for the enantioselective synthesis of fully protected α-quaternary α-hydroxy-β-amino esters via the coupling of three components: aryl Grignard reagents (or methyllithium), silyl glyoxylate, and N-tert-butanesulfinyl imines. This protocol enables successive formation of two C-C bonds and two adjacent chiral carbons with high stereocontrol in a one-pot operation.
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Affiliation(s)
- Jiu-Long Jiang
- The Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China , and University of the Chinese Academy of Sciences , China
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24
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Cirriez V, Rasson C, Riant O. Synthesis of Acylsilanes by Copper(I)-Catalyzed Addition of Silicon Nucleophiles onto Acid Derivatives. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300621] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Affiliation(s)
- Hélène Pellissier
- Aix-Marseille Université, UMR CNRS 7313 Institut des Sciences Moléculaires de Marseille Equipe Chirosciences, Case 561, Campus Saint Jérôme Avenue Esc. Normandie-Niemen, 13397 Marseille Cedex 20, France
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26
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Gao G, Bai XF, Li F, Zheng LS, Zheng ZJ, Lai GQ, Jiang K, Li F, Xu LW. A Lewis acid-promoted reduction of acylsilanes to α-hydroxysilanes by diethylzinc. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.02.059] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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27
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Roy S, Reiser O. Katalytische Mehrkomponentenreaktionen zur stereoselektiven Synthese voncis-4,5-disubstituierten Pyrrolidinonen und Tetrahydro-3H-pyrrolo[3,2-c]chinolinen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107831] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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28
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Roy S, Reiser O. A catalytic multicomponent approach for the stereoselective synthesis of cis-4,5-disubstituted pyrrolidinones and tetrahydro-3H-pyrrolo[3,2-c]quinolines. Angew Chem Int Ed Engl 2012; 51:4722-5. [PMID: 22461239 DOI: 10.1002/anie.201107831] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Sudipta Roy
- Institut für Organische Chemie, Universität Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
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29
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De Vreese R, D'hooghe M. N-Heterocyclic carbene/Brønsted acid cooperative catalysis as a powerful tool in organic synthesis. Beilstein J Org Chem 2012; 8:398-402. [PMID: 22509208 PMCID: PMC3326616 DOI: 10.3762/bjoc.8.43] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Accepted: 02/29/2012] [Indexed: 11/23/2022] Open
Abstract
The interplay between metals and N-heterocyclic carbenes (NHCs) has provided a window of opportunities for the development of novel catalytic strategies within the past few years. The recent successful combination of Brønsted acids with NHCs has added a new dimension to the field of cooperative catalysis, enabling the stereoselective synthesis of functionalized pyrrolidin-2-ones as valuable scaffolds in heterocyclic chemistry. This Commentary will briefly highlight the concept of N-heterocyclic carbene/Brønsted acid cooperative catalysis as a new and powerful methodology in organic chemistry.
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Affiliation(s)
- Rob De Vreese
- SynBioC Research Group, Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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30
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Palladium-catalyzed carbonylative coupling reactions of aryl iodides with hexamethyldisilane (HMDS) to benzoyl silanes. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.11.104] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Brekan JA, Chernyak D, White KL, Scheidt KA. Lewis base-promoted carbon–carbon sp3–sp3 coupling reactions of α-silyl silylethers. Chem Sci 2012. [DOI: 10.1039/c2sc00581f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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32
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Yao M, Lu CD. Three-Component Reactions of Sulfonylimidates, Silyl Glyoxylates and N-tert-Butanesulfinyl Aldimines: An Efficient, Diastereoselective, and Enantioselective Synthesis of Cyclic N-Sulfonylamidines. Org Lett 2011; 13:2782-5. [DOI: 10.1021/ol201029b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ming Yao
- Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China and Graduate University of the Chinese Academy of Sciences
| | - Chong-Dao Lu
- Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China and Graduate University of the Chinese Academy of Sciences
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33
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Wang H, Han X, Lu X. Pd(II)-catalyzed annulation of N-benzyl-N-aroylmethyl-2-alkynamides with arylboronic acids: an efficient synthesis of highly substituted α-alkylidene-β-hydroxy-γ-lactams. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.09.090] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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34
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Shen A, Liu M, Jia ZS, Xu MH, Lin GQ. One-Pot Synthesis of Chiral α-Methylene-γ-lactams with Excellent Diastereoselectivities and Enantioselectivities. Org Lett 2010; 12:5154-7. [DOI: 10.1021/ol102148b] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- An Shen
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Min Liu
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Zhen-Shan Jia
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Ming-Hua Xu
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Guo-Qiang Lin
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China, and Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
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35
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Boeckman RK, Miller Y, Ryder TR. Diels−Alder Reactions of Cyclic Isoimidium Salts. Org Lett 2010; 12:4524-7. [DOI: 10.1021/ol101831b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert K. Boeckman
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Yan Miller
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Todd R. Ryder
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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36
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Yan W, Li P, Feng J, Wang D, Zhu S, Jiang X, Wang R. Design and synthesis of a tridentate ligand inspired by the phenomenon of self-assembly catalysis and its application in the asymmetric alkynylation of N-(diphenylphosphinoyl) imines. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.07.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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37
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Palacios F, Olszewski TK, Vicario J. Diastereoselective hydrophosphonylation of imines using (R,R)-TADDOL phosphite. Asymmetric synthesis of α-aminophosphonic acid derivatives. Org Biomol Chem 2010; 8:4255-8. [DOI: 10.1039/c003004j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Benamer M, Turcaud S, Royer J. Diastereoselective alkynylation of chiral phosphinoylimines: preparation of optically active propargylamines. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.11.091] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Yus M, Foubelo F, K. Dema H. Stereoselective Synthesis of α-Methylene-γ-butyrolactams from Ethyl 2-(Bromomethyl)acrylate and Chiral Sulfinyl Aldimines Mediated by Indium. HETEROCYCLES 2010. [DOI: 10.3987/com-09-s(s)27] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Greszler SN, Johnson JS. Diastereoselective synthesis of pentasubstituted gamma-butyrolactones from silyl glyoxylates and ketones through a double Reformatsky reaction. Angew Chem Int Ed Engl 2009; 48:3689-91. [PMID: 19373816 DOI: 10.1002/anie.200900215] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Three contiguous stereocenters can be established with remarkable diastereoselectivity in a double Reformatsky sequence. Densely functionalized gamma-butyrolactones were assembled rapidly by this approach, in which a ketone is used as the terminal electrophile (see scheme). Secondary transformations of the lactone products enhance their synthetic utility. R(1) = Me, H; R(2) = alkyl, aryl, CF(3); Bn = benzyl, TBS = tert-butyldimethylsilyl.
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Affiliation(s)
- Stephen N Greszler
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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41
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Lettan RB, Galliford CV, Woodward CC, Scheidt KA. Amide Enolate Additions to Acylsilanes: In Situ Generation of Unusual and Stereoselective Homoenolate Equivalents. J Am Chem Soc 2009; 131:8805-14. [DOI: 10.1021/ja808811u] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert B. Lettan
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Chris V. Galliford
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Chase C. Woodward
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Karl A. Scheidt
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
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42
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Greszler S, Johnson J. Diastereoselective Synthesis of Pentasubstituted γ-Butyrolactones from Silyl Glyoxylates and Ketones through a Double Reformatsky Reaction. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900215] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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43
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44
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Elford TG, Ulaczyk-Lesanko A, De Pascale G, Wright GD, Hall DG. Diversity-Oriented Synthesis and Preliminary Biological Screening of Highly Substituted Five-Membered Lactones and Lactams Originating From an Allyboration of Aldehydes and Imines. ACTA ACUST UNITED AC 2008; 11:155-68. [DOI: 10.1021/cc8001487] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tim G. Elford
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2, and M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada, L8N 3Z5
| | - Agnieszka Ulaczyk-Lesanko
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2, and M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada, L8N 3Z5
| | - Gianfranco De Pascale
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2, and M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada, L8N 3Z5
| | - Gerard D. Wright
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2, and M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada, L8N 3Z5
| | - Dennis G. Hall
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2, and M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada, L8N 3Z5
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45
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Elford TG, Hall DG. Imine allylation using 2-alkoxycarbonyl allylboronates as an expedient three-component reaction to polysubstituted α-exo-methylene-γ-lactams. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.09.112] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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46
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Lumby RJ, Joensuu PM, Lam HW. Racemic and asymmetric cobalt-catalysed reductive aldol couplings of α,β-unsaturated amides with ketones. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.06.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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