1
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Choi S, Dong G. Rapid and Modular Access to Multifunctionalized 1,2-Azaborines via Palladium/Norbornene Cooperative Catalysis. J Am Chem Soc 2024; 146:9512-9518. [PMID: 38551167 DOI: 10.1021/jacs.4c01582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
1,2-Azaborines, a unique class of BN-isosteres of benzene, have attracted great interest across several fields. While significant advancements have been made in the postfunctionalization of 1,2-azaborines, challenges still exist for the selective functionalization of the C4 position and access to 1,2-azaborines with five or six independently installed substituents. Here we report a rapid and modular method for C3 and C4 difunctionalization of 1,2-azaborines using the palladium/norbornene (Pd/NBE) cooperative catalysis. Enabled by the C2 amide-substituted NBE, diverse 3-iodo-1,2-azaborines can be used as substrates, showing broad functional group tolerance. Besides ortho arylation, preliminary success of ortho alkylation has also been realized. In addition, a range of alkenes and nucleophiles can be employed for ipso C3 functionalization. The reaction is scalable, and various postfunctionalizations, including forming hexa-substituted 1,2-azaborines, have been achieved.
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Affiliation(s)
- Shinyoung Choi
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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2
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Lyu H, Tugwell TH, Chen Z, Kukier GA, Turlik A, Wu Y, Houk KN, Liu P, Dong G. Modular synthesis of 1,2-azaborines via ring-opening BN-isostere benzannulation. Nat Chem 2024; 16:269-276. [PMID: 37783725 DOI: 10.1038/s41557-023-01343-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 09/08/2023] [Indexed: 10/04/2023]
Abstract
1,2-Azaborines represent a unique class of benzene isosteres that have attracted interest for developing pharmaceuticals with better potency and bioavailability. However, it remains a long-standing challenge to prepare monocyclic 1,2-azaborines, particularly multi-substituted ones, in an efficient and modular manner. Here we report a straightforward method to directly access diverse multi-substituted 1,2-azaborines from readily available cyclopropyl imines/ketones and dibromoboranes under relatively mild conditions. The reaction is scalable, shows a broad substrate scope, and tolerates a range of functional groups. The utility of this method is demonstrated in the concise syntheses of BN isosteres of a PD-1/PD-L1 inhibitor and pyrethroid insecticide, bifenthrin. Combined experimental and computational mechanistic studies suggest that the reaction pathway involves boron-mediated cyclopropane ring-opening and base-mediated elimination, followed by an unusual low-barrier 6π-electrocyclization accelerated by the BN/CC isomerism. This method is anticipated to find applications for the synthesis of BN-isostere analogues in medicinal chemistry, and the mechanistic insights gained here may guide developing other boron-mediated electrocyclizations.
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Affiliation(s)
- Hairong Lyu
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Thomas H Tugwell
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Zhijie Chen
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Garrett A Kukier
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Aneta Turlik
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Yifei Wu
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, IL, USA.
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3
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Appiarius Y, Míguez-Lago S, Puylaert P, Wolf N, Kumar S, Molkenthin M, Miguel D, Neudecker T, Juríček M, Campaña AG, Staubitz A. Boosting quantum yields and circularly polarized luminescence of penta- and hexahelicenes by doping with two BN-groups. Chem Sci 2024; 15:466-476. [PMID: 38179512 PMCID: PMC10762774 DOI: 10.1039/d3sc02685j] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 10/23/2023] [Indexed: 01/06/2024] Open
Abstract
The incorporation of boron-nitrogen (BN) units into polycyclic aromatic hydrocarbons (PAHs) as an isoelectronic replacement of two carbon atoms can significantly improve their optical properties, while the geometries are mostly retained. We report the first non-π-extended penta- and hexahelicenes comprising two aromatic 1,2-azaborinine rings. Comparing them with their all-carbon analogs regarding structural, spectral and (chir)optical properties allowed us to quantify the impact of the heteroatoms. In particular, BN-hexahelicene BN[6] exhibited a crystal structure congruent with its analog CC[6], but displayed a fivefold higher fluorescence quantum yield (φfl = 0.17) and an outstanding luminescence dissymmetry factor (|glum| = 1.33 × 10-2). Such an unusual magnification of both properties at the same time makes BN-helicenes suitable candidates as circularly polarized luminescence emitters for applications in materials science.
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Affiliation(s)
- Yannik Appiarius
- University of Bremen, Institute for Organic and Analytical Chemistry 28359 Bremen Germany
- University of Bremen, MAPEX Center for Materials and Processes 28359 Bremen Germany
| | - Sandra Míguez-Lago
- University of Granada, Department of Organic Chemistry, Unidad de Excelencia de Química 18071 Granada Spain
| | - Pim Puylaert
- University of Bremen, Institute for Inorganic Chemistry and Crystallography 28359 Bremen Germany
| | - Noah Wolf
- University of Bremen, Institute for Organic and Analytical Chemistry 28359 Bremen Germany
| | - Sourabh Kumar
- University of Bremen, Institute for Physical and Theoretical Chemistry 28359 Bremen Germany
| | - Martin Molkenthin
- University of Bremen, Institute for Organic and Analytical Chemistry 28359 Bremen Germany
| | - Delia Miguel
- University of Granada, Department of Physical Chemistry, Unidad de Excelencia de Química 18071 Granada Spain
| | - Tim Neudecker
- University of Bremen, MAPEX Center for Materials and Processes 28359 Bremen Germany
- University of Bremen, Institute for Physical and Theoretical Chemistry 28359 Bremen Germany
- University of Bremen, Bremen Center for Computational Materials Science 28359 Bremen Germany
| | - Michal Juríček
- University of Zurich, Department of Chemistry 8057 Zurich Switzerland
| | - Araceli G Campaña
- University of Granada, Department of Organic Chemistry, Unidad de Excelencia de Química 18071 Granada Spain
| | - Anne Staubitz
- University of Bremen, Institute for Organic and Analytical Chemistry 28359 Bremen Germany
- University of Bremen, MAPEX Center for Materials and Processes 28359 Bremen Germany
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4
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Chen W, Liu J, Sun W, Yu S, Li Y, Li Z. Metalloborospherenes with a Stabilized Classical Fullerene-like Borospherene B 40 Act as Nonlinear Optical Switches, Electron Reservoirs, Molecular Capacitors, and Molecular Reactors. J Phys Chem A 2023; 127:10054-10067. [PMID: 37988329 DOI: 10.1021/acs.jpca.3c04270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Using a new method of η5-Li and η6-Mg atoms capping the faces of the classical fullerene-like borospherene Td B40, we theoretically predict an exohedral metalloborospherene Td Mg10Li12&B40 molecule. Remarkably, a newfangled endoexo cage isomerism is proposed. Further, embedding Mg atoms in the Td B40 cage forms endohedral derivatives. Due to the intramolecular pull-push electron transfer relay, these obtained molecules possess unequal multilayered and alternant spherical charge distribution. The outer is an excess electron layer, bringing a molecular nonlinear switch character and an electron reservoir behavior with strong electron-donating and -accepting abilities. The middle (Mg2+)10(Li+)12 and the outer layers together constitute an electric double layer, presenting the behavior of a molecular capacitor where the electronic charge-discharge process occurs in the outer excess electron layer. The inner part is an empty cage B4026- with a strong negative electric field. The valence electrons of the embedded Mg atoms are transformed into new excess electrons and added in the outer excess electron layer, also exhibiting the charging behavior of the molecular capacitor. Considering the chemical reaction in the inner cage, the embedded Mg atom is ionized, forming an Mg2+ cation and 2e under the strong negative electric field; meanwhile, 2e is powerfully pushed into the outer excess electron layer. This chemical process shows a generalized Coulomb explosion, and thus the exohedral metalloborospherene molecules with cage B4026- may act as molecular reactors. The new species mark the genesis of classical fullerene-like borospherene chemistry and stimulate their applications in molecular nonlinear optical and nanoelectronics.
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Affiliation(s)
- Weihong Chen
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science, Jilin University, Changchun 130012, China
| | - Jiayuan Liu
- Institute of Applied Chemistry, Hebei North University, Zhangjiakou 075000, China
| | - Weiming Sun
- Department of Basic Chemistry, The School of Pharmacy, Fujian Medical University, Fuzhou 350108, China
| | - Shansheng Yu
- Key Laboratory of Automobile Materials of MOE and Department of Materials Science, Jilin University, Changchun 130012, China
| | - Ying Li
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Zhiru Li
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
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5
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Xu J, Qiu W, Zhang X, Wu Z, Zhang Z, Yang K, Song Q. Palladium-Catalyzed Atroposelective Kinetic C-H Olefination and Allylation for the Synthesis of C-B Axial Chirality. Angew Chem Int Ed Engl 2023; 62:e202313388. [PMID: 37840007 DOI: 10.1002/anie.202313388] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/11/2023] [Accepted: 10/13/2023] [Indexed: 10/17/2023]
Abstract
The direct C-H functionalization of 1,2-benzazaborines, especially asymmetric version, remains a great challenge. Here we report a palladium-catalyzed enantioselective C-H olefination and allylation reactions of 1,2-benzazaborines. This asymmetric approach is a kinetic resolution (KR), providing various C-B axially chiral 2-aryl-1,2-benzazaborines and 3-substituted 2-aryl-1,2-benzazaborines in generally high yields with excellent enantioselectivities (selectivity (S) factor up to 354). The synthetic potential of this reaction is showcased by late-stage modification of complex molecules, scale-up reaction, and applications.
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Affiliation(s)
- Jie Xu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Weihua Qiu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Xu Zhang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Zhihan Wu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Zhen Zhang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Kai Yang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Qiuling Song
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China
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6
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Appiarius Y, Puylaert P, Staubitz A. Synthesis and crystal structure of bis-(9-mesityl-9,10-di-hydro-10-aza-9-borabenzo[ h]quinolinato-κ 2N1, N10)zinc(II). Acta Crystallogr E Crystallogr Commun 2023; 79:1063-1066. [PMID: 37936839 PMCID: PMC10626948 DOI: 10.1107/s2056989023009192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 10/19/2023] [Indexed: 11/09/2023]
Abstract
The title compound, [Zn(C20H18BN2)2] (Zn L 2), is an overall uncharged chelate that consists of two units of an NH-deprotonated 10-aza-9-borabenzo[h]quinoline ligand (L) per ZnII center. It was synthesized in two steps by treating the protonated ligand HL with lithium bis-(tri-methyl-sil-yl)amide and further conversion with di-ethyl-zinc. Its asymmetric unit comprises one ZnL fragment; the mol-ecule is completed by application of inversion symmetry at Zn. Due to the fourfold coordination with nitro-gen atoms, the zinc(II) ion is located in a distorted tetra-hedral environment. Besides the relatively short N-Zn bonds, Zn L 2 is characterized by the significant protrusion of the central ion from the plane of the ligand backbone. The crystal structure is consolidated by intra- and inter-molecular π-π stacking inter-actions, while the polarized B-N bond is barely involved in any close atom contacts.
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Affiliation(s)
- Yannik Appiarius
- University of Bremen, Institute for Organic and Analytical Chemistry, 28359 Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
| | - Pim Puylaert
- University of Bremen, Institute for Inorganic Chemistry and Crystallography, 28359 Bremen, Germany
| | - Anne Staubitz
- University of Bremen, Institute for Organic and Analytical Chemistry, 28359 Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
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7
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Abstract
General protocols for the N-functionalization of 1,2-azaborines with C(sp3), C(sp2), or C(sp) electrophiles are described. The syntheses of a new parental BN isostere of trans-stilbene and a BN isostere of a lisdexamfetamine derivative were accomplished with the developed methodology.
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Affiliation(s)
- Hyelee Lee
- Department of Chemistry, Boston College, Chestnut Hill, MA 02467-3860, USA
- Accent Therapeutics, Inc., 1050 Waltham Street, Suite 201, Lexington, MA 02421, USA
| | - Marisol Alvarado
- Department of Chemistry, Boston College, Chestnut Hill, MA 02467-3860, USA
| | - Sarah Ingram
- Department of Chemistry, Boston College, Chestnut Hill, MA 02467-3860, USA
- Regeneron Pharmaceuticals, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Bo Li
- Department of Chemistry, Boston College, Chestnut Hill, MA 02467-3860, USA
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, MA 02467-3860, USA
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8
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Lindl F, Lamprecht A, Arrowsmith M, Khitro E, Rempel A, Dietz M, Wellnitz T, Bélanger-Chabot G, Stoy A, Paprocki V, Prieschl D, Lenczyk C, Ramler J, Lichtenberg C, Braunschweig H. Aromatic 1,2-Azaborinin-1-yls as Electron-Withdrawing Anionic Nitrogen Ligands for Main Group Elements. Chemistry 2023; 29:e202203345. [PMID: 36412126 DOI: 10.1002/chem.202203345] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/21/2022] [Accepted: 11/21/2022] [Indexed: 11/23/2022]
Abstract
The 2-aryl-3,4,5,6-tetraphenyl-1,2-azaborinines 1-EMe3 and 2-EMe3 (E=Si, Sn; aryl=Ph (1), Mes (=2,4,6-trimethylphenyl, 2)) were synthesized by ring-expansion of borole precursors with N3 EMe3 -derived nitrenes. Desilylative hydrolysis of 1- and 2-SiMe3 yielded the corresponding N-protonated azaborinines, which were deprotonated with nBuLi or MN(SiMe3 )2 (M=Na, K) to the corresponding group 1 salts, 1-M and 2-M. While the lithium salts crystallized as monomeric Lewis base adducts, the potassium salts formed coordination polymers or oligomers via intramolecular K⋅⋅⋅aryl π interactions. The reaction of 1-M or 2-M with CO2 yielded N-carboxylate salts, which were derivatized by salt metathesis to methyl and silyl esters. Salt metathesis of 1-M or 2-M with methyl triflate, [Cp*BeCl] (Cp*=C5 Me5 ), BBr2 Ar (Ar=Ph, Mes, 2-thienyl), ECl3 (E=B, Al, Ga) and PX3 (X=Cl, Br) afforded the respective group 2, 13 and 15 1,2-azaborinin-2-yl complexes. Salt metathesis of 1-K with BBr3 resulted not only in N-borylation but also Ph-Br exchange between the endocyclic and exocyclic boron atoms. Solution 11 B NMR data suggest that the 1,2-azaborinin-2-yl ligand is similarly electron-withdrawing to a bromide. In the solid state the endocyclic bond length alternation and the twisting of the C4 BN ring increase with the sterics of the substituents at the boron and nitrogen atoms, respectively. Regression analyses revealed that the downfield shift of the endocyclic 11 B NMR resonances is linearly correlated to both the degree of twisting of the C4 BN ring and the tilt angle of the N-substituent. Calculations indicate that the 1,2-azaborinin-1-yl ligand has no sizeable π-donor ability and that the aromaticity of the ring can be subtly tuned by the electronics of the N-substituent.
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Affiliation(s)
- Felix Lindl
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Anna Lamprecht
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Merle Arrowsmith
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Eugen Khitro
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Anna Rempel
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Maximilian Dietz
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Tim Wellnitz
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | | | - Andreas Stoy
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Valerie Paprocki
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Dominik Prieschl
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Carsten Lenczyk
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Jacqueline Ramler
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Crispin Lichtenberg
- Chemistry Department - FB 15, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032, Marburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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9
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Okada N, Nakatsuka S, Kawasumi R, Gotoh H, Yasuda N, Hatakeyama T. Synthesis and Late-Stage Diversification of BN-Embedded Dibenzocorannulenes as Efficient Fluorescence Organic Light-Emitting Diode Emitters. Chemistry 2023; 29:e202202627. [PMID: 36260535 DOI: 10.1002/chem.202202627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Indexed: 11/07/2022]
Abstract
We report the synthesis and late-stage diversification of a new class of hetero-buckybowl, BN-embedded dibenzocorannulenes (B2 N2 -DBCs). The synthesis is achieved via one-shot halogenative borylation, comprising the nitrogen-directed haloboration of alkyne and an intramolecular bora-Friedel-Crafts reaction, which provides BN-embedded dibenzocorannulene possessing two bromo substituents (B2 N2 -DBC-Br). B2 N2 -DBC-Br undergoes diversification via coupling reactions to provide a variety of arylated derivatives (B2 N2 -DBC-R), exhibiting strong blue fluorescence. An organic light-emitting diode (OLED) employing one of the derivatives as an emitter exhibited a high external quantum efficiency of 6.6 % and long operational lifetime of 907 h at an initial luminance of 1000 cd m-2 , indicating the significant potential for the development of efficient and stable hetero-buckybowl-based OLED materials.
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Affiliation(s)
- Naoya Okada
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
| | - Soichiro Nakatsuka
- Department of Chemistry, School of Science, Kyoto University Sakyo-ku, Kyoto, 606-8502, Japan
| | - Ryosuke Kawasumi
- SK JNC Japan, Co. Ltd., 5-1 Goi Kaigan, Ichihara, Chiba, 290-8551, Japan
| | - Hajime Gotoh
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
| | - Nobuhiro Yasuda
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Takuji Hatakeyama
- Department of Chemistry, School of Science, Kyoto University Sakyo-ku, Kyoto, 606-8502, Japan
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10
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Knöller JA, Meng G, Wang X, Hall D, Pershin A, Beljonne D, Olivier Y, Laschat S, Zysman‐Colman E, Wang S. Intramolecular Borylation via Sequential B−Mes Bond Cleavage for the Divergent Synthesis of B,N,B‐Doped Benzo[4]helicenes. Angew Chem Int Ed Engl 2020; 59:3156-3160. [DOI: 10.1002/anie.201912340] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Julius A. Knöller
- Department of ChemistryQueen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
- Institute for Organic ChemistryStuttgart University Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Guoyun Meng
- School of Chemistry and Chemical EngineeringBeijing Institute of Technology Beijing China
| | - Xiang Wang
- Department of ChemistryQueen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
| | - David Hall
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St Andrews St Andrews KY16 9ST UK
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons 7000 Mons Belgium
| | - Anton Pershin
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons 7000 Mons Belgium
| | - David Beljonne
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons 7000 Mons Belgium
| | - Yoann Olivier
- Unité de Chimie Physique Théorique et Structurale & Laboratoire de Physique du SolideNamur Institute of Structured MatterUniversité de Namur Rue de Bruxelles, 61 5000 Namur Belgium
| | - Sabine Laschat
- Institute for Organic ChemistryStuttgart University Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Eli Zysman‐Colman
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St Andrews St Andrews KY16 9ST UK
| | - Suning Wang
- Department of ChemistryQueen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
- School of Chemistry and Chemical EngineeringBeijing Institute of Technology Beijing China
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11
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Knöller JA, Meng G, Wang X, Hall D, Pershin A, Beljonne D, Olivier Y, Laschat S, Zysman‐Colman E, Wang S. Divergente Synthese von B,N,B‐Benzo[4]helicenen durch intramolekulare Borylierung unter sequenzieller B‐Mes‐Bindungsspaltung. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912340] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Julius A. Knöller
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Kanada
- Institut für Organische Chemie Universität Stuttgart Deutschland
| | - Guoyun Meng
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Peking China
| | - Xiang Wang
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Kanada
| | - David Hall
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews KY16 9ST Großbritannien
- Laboratory for Chemistry of Novel Materials University of Mons Belgien
| | - Anton Pershin
- Laboratory for Chemistry of Novel Materials University of Mons Belgien
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials University of Mons Belgien
| | - Yoann Olivier
- Unité de Chimie Physique Théorique et Structurale, & Laboratoire de Physique du Solide Namur Institute of Structured Matter Université de Namur Belgien
| | - Sabine Laschat
- Institut für Organische Chemie Universität Stuttgart Deutschland
| | - Eli Zysman‐Colman
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews KY16 9ST Großbritannien
| | - Suning Wang
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Kanada
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Peking China
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12
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Liu Y, Liu SY. Exploring the strength of a hydrogen bond as a function of steric environment using 1,2-azaborine ligands and engineered T4 lysozyme receptors. Org Biomol Chem 2019; 17:7002-7006. [PMID: 31309207 PMCID: PMC6656596 DOI: 10.1039/c9ob01008d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A congeneric series of 1,2-azaborine ligands was used to study the relationship between the steric demand of the ligand and hydrogen bonding strength in the context of ligand-protein binding using engineered T4 lysozymes as the model biomacromolecules. The hydrogen bonding strength values were extracted from experimentally accessible binding free energies using the Double Mutant Cycle analysis. With the increasing steric demand, the NH…102Q hydrogen bonding interaction is weakened; however, this weakening of the hydrogen bonding interaction occurs in discrete steps rather than in an incremental fashion.
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Affiliation(s)
- Yao Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA.
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA.
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13
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Spokoyny AM, Chiu CW, Bosley BD, Schubert DM. “Mr. Boron”, an Inorganic Chemistry Icon, Turns 90. Inorg Chem 2019; 58:5369-5374. [DOI: 10.1021/acs.inorgchem.9b00913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander M. Spokoyny
- Department of Chemistry and Biochemistry and California Nanosystems Institute, University of California, Los Angeles (UCLA), 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Ching-Wen Chiu
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Beth D. Bosley
- Boron Specialties LLC, 2301 Duss Avenue, Building 9, Ambridge, Pennsylvania 15003, United States
| | - David M. Schubert
- Chemistry Department, Metropolitan State University of Denver, P.O. Box 173362, Campus Box 52, Denver, Colorado 80217, United States
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14
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Shi P, Wang J, Gan Z, Zhang J, Zeng R, Zhao Y. A practical copper-catalyzed approach to β-lactams via radical carboamination of alkenyl carbonyl compounds. Chem Commun (Camb) 2019; 55:10523-10526. [PMID: 31415048 DOI: 10.1039/c9cc05668h] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Functionalized β-lactams are highly important motifs in synthetic chemistry. We report an efficient and novel approach to the synthesis of β-lactams via a copper(i)-catalyzed cascade process involving C(benzyl)-H radical abstraction, intermolecular alkene addition, and intramolecular amination reaction. Variously substituted alkenes were synthesized from vinylacetic acid, leading to the corresponding β-lactams in moderate to good yields. Preliminary studies indicate that the reaction undergoes a free radical mechanism via a Cu(i)/Cu(ii)/Cu(iii) catalytic cycle.
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Affiliation(s)
- Peng Shi
- Soochow University, College of Chemistry, Chemical Engineering and Materials Science, 199 Ren'ai Road, Suzhou, Jiangsu, China.
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15
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Abstract
BN/CC isosterism has emerged as a viable strategy to expand the chemical space of organic molecules. In particular, the application of BN/CC isosterism to arenes has received significant attention due to the vast available chemical space provided by aromatic hydrocarbons. The synthetic efforts directed at assembling novel aromatic BN heterocycles have resulted in the discovery of new properties and functions in a variety of fields including biomedical research, medicinal chemistry, materials science, catalysis, and organic synthesis. This tutorial review specifically covers recent advances in synthetic technologies that functionalize assembled boron-nitrogen (BN) heterocycles and highlights their distinct reactivity and selectivity in comparison to their carbonaceous counterparts. It is intended to serve as a state-of-the-art compendium for readers who are interested in the reaction chemistry of BN heterocycles.
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Affiliation(s)
- Cameron R McConnell
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860, USA.
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16
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Mitsudo K, Shigemori K, Mandai H, Wakamiya A, Suga S. Synthesis and Properties of Dithieno-Fused 1,4-Azaborine Derivatives. Org Lett 2018; 20:7336-7340. [DOI: 10.1021/acs.orglett.8b03316] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Koichi Mitsudo
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Keisuke Shigemori
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Hiroki Mandai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Atsushi Wakamiya
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Seiji Suga
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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17
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van de Wouw HL, Lee JY, Awuyah EC, Klausen RS. A BN Aromatic Ring Strategy for Tunable Hydroxy Content in Polystyrene. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201711650] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Heidi L. van de Wouw
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
| | - Jae Young Lee
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
| | - Elorm C. Awuyah
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
| | - Rebekka S. Klausen
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
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18
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van de Wouw HL, Lee JY, Awuyah EC, Klausen RS. A BN Aromatic Ring Strategy for Tunable Hydroxy Content in Polystyrene. Angew Chem Int Ed Engl 2018; 57:1673-1677. [DOI: 10.1002/anie.201711650] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Heidi L. van de Wouw
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
| | - Jae Young Lee
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
| | - Elorm C. Awuyah
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
| | - Rebekka S. Klausen
- Department of Chemistry; Johns Hopkins University; 3400 N. Charles St Baltimore MD 21218 USA
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19
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Morgan MM, Rautiainen JM, Piers WE, Tuononen HM, Gendy C. Divergent reactivity of nucleophilic 1-bora-7a-azaindenide anions. Dalton Trans 2018; 47:734-741. [PMID: 29239418 DOI: 10.1039/c7dt04350c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The reactions of 1-bora-7a-azaindenide anions, prepared in moderate to excellent yields by reduction of the appropriate 1-bora-7a-azaindenyl chlorides with KC8 in THF, with alkyl halides and carbon dioxide were studied. With alkyl halides (CH2Cl2, CH3I and BrCH(D)CH(D)tBu), the anions behave as boron anions, alkylating the boron centre via a classic SN2 mechanism. This was established with DFT methods and via experiments utilizing the neo-hexyl stereoprobe BrCH(D)CH(D)tBu. These reactions were in part driven by a re-aromatization of the six membered pyridyl ring upon formation of the product. Conversely, in the reaction of the 1-bora-7a-azaindenide anions with CO2, a novel carboxylation of the C-2 carbon alpha to boron was observed. Computations indicated that while carboxylation of the boron centre was kinetically feasible, the products of B-carboxylation were not thermodynamically favored relative to the observed C-2 carboxylated species, which were formed preferably due to the generation of both C-C and B-O bonds. In these products, the pyridyl ring remains non-aromatic, in part accounting for the observed reversibility of carboxylation.
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Affiliation(s)
- Matthew M Morgan
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
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