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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Zhu L, Kinjo R. Crystalline 2π Aromatic Azadiboriridinylium: A BN Analogue of Cyclopropenylium Cation. Angew Chem Int Ed Engl 2023; 62:e202312949. [PMID: 37828652 DOI: 10.1002/anie.202312949] [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: 09/01/2023] [Revised: 09/28/2023] [Accepted: 10/09/2023] [Indexed: 10/14/2023]
Abstract
N-Substitution of a thermally unstable diboratriazole 1 with a trimethylsilyl group affords a remarkably stable diboratriazole derivative 2. Ring contraction of 2 with an N-heterocyclic carbene accompanied by the release of N2 as well as 1,4-hydrogen shift affords a carbene-stabilized azadiboriridine 3. Abstraction of the H-B3mem hydride in 3 with methyl trifluoromethanesulfonate leads to the isolation of a hitherto unknown azadiboriridinylium 4, the first BN analogue of cyclopropenylium cation. X-ray diffraction analysis and computational studies confirmed the delocalization of π electrons over the B2 N three-membered ring, indicating the 2π aromatic feature. Compound 4 undergoes ring expansion reactions with azobenzene and pyridazine to furnish triazadiborolidinylium species 5 and 6, the latter of which possesses a cationic B2 N3 ring with a pronounced 6π aromatic property. Moreover, the reaction of 4 with a diazo compound produces a cationic B2 N3 C pentafulvene derivative 7.
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Affiliation(s)
- Lizhao Zhu
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Nanyang Link 21, Singapore, 637371, Singapore
| | - Rei Kinjo
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Nanyang Link 21, Singapore, 637371, Singapore
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3
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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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4
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Liu Y, Puig de la Bellacasa R, Li B, Cuenca AB, Liu SY. The Versatile Reaction Chemistry of an Alpha-Boryl Diazo Compound. J Am Chem Soc 2021; 143:14059-14064. [PMID: 34431676 DOI: 10.1021/jacs.1c06112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first α-boryl diazo compound that is capable of engaging in classic synthetic organic diazo reaction chemistry is described. The diazomethyl-1,2-azaborine 1, which is a BN isostere of phenyldiazomethane, is significantly more stable than phenyldiazomethane; its reaction chemistry ranges from C-H activation, O-H activation, [3+2] cycloaddition, and halogenation, to Ru-catalyzed carbonyl olefination. The demonstrated broad range of reactivity of diazomethyl-1,2-azaborine 1 makes it an exceptionally versatile synthetic building block for the 1,2-azaborine heterocyclic motif.
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Affiliation(s)
- Yao Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467-3860, United States
| | - Raimon Puig de la Bellacasa
- Department of Organic and Pharmaceutical Chemistry, Institut Químic de Sarrià, Universitat Ramon Llull, E-08017 Barcelona, Spain
| | - Bo Li
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467-3860, United States
| | - Ana Belén Cuenca
- Department of Organic and Pharmaceutical Chemistry, Institut Químic de Sarrià, Universitat Ramon Llull, E-08017 Barcelona, Spain
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467-3860, United States
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5
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Gotoh H, Nakatsuka S, Tanaka H, Yasuda N, Haketa Y, Maeda H, Hatakeyama T. Syntheses and Physical Properties of Cationic BN‐Embedded Polycyclic Aromatic Hydrocarbons. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103488] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Hajime Gotoh
- 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 and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
| | - Hiroki Tanaka
- Department of Applied Chemistry College of Life Sciences Ritsumeikan University 1-1-1 Kusatsu Shiga 525-8577 Japan
| | - Nobuhiro Yasuda
- Japan Synchrotron Radiation Research Institute (JASRI) 1-1-1, Kouto, Sayo-cho Sayo-gun Hyogo 679-5198 Japan
| | - Yohei Haketa
- Department of Applied Chemistry College of Life Sciences Ritsumeikan University 1-1-1 Kusatsu Shiga 525-8577 Japan
| | - Hiromitsu Maeda
- Department of Applied Chemistry College of Life Sciences Ritsumeikan University 1-1-1 Kusatsu Shiga 525-8577 Japan
| | - Takuji Hatakeyama
- Department of Chemistry School of Science and Technology Kwansei Gakuin University 2-1 Gakuen Sanda Hyogo 669-1337 Japan
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6
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Gotoh H, Nakatsuka S, Tanaka H, Yasuda N, Haketa Y, Maeda H, Hatakeyama T. Syntheses and Physical Properties of Cationic BN-Embedded Polycyclic Aromatic Hydrocarbons. Angew Chem Int Ed Engl 2021; 60:12835-12840. [PMID: 33749982 DOI: 10.1002/anie.202103488] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Indexed: 11/10/2022]
Abstract
Cationic BN-embedded polycyclic aromatic hydrocarbons (BN-PAH+ s) were synthesized from a nitrogen-containing macrocycle via pyridine-directed tandem C-H borylation. Incorporating BN into PAH+ resulted in a remarkable hypsochromic shift due to an increase in the LUMO energy and the symmetry changes of the HOMO and LUMO. Electrophilic substitution or anion exchange of BN-PAH+ possessing tetrabromoborate as a counter anion (BN+ [BBr4 - ]) afforded air-stable BN-PAH/PAH+ s. Of these, BN+ [TfO- ] allowed reversible two-electron reduction and the formation of two-dimensional brickwork-type π-electronic ion pair with 1,2,3,4,5-pentacyanocyclopentadienyl anion, demonstrating the potential application of BN-PAH+ as electronic materials.
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Affiliation(s)
- Hajime Gotoh
- 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 and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
| | - Hiroki Tanaka
- Department of Applied Chemistry College of Life Sciences, Ritsumeikan University, 1-1-1 Kusatsu, Shiga, 525-8577, Japan
| | - Nobuhiro Yasuda
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Yohei Haketa
- Department of Applied Chemistry College of Life Sciences, Ritsumeikan University, 1-1-1 Kusatsu, Shiga, 525-8577, Japan
| | - Hiromitsu Maeda
- Department of Applied Chemistry College of Life Sciences, Ritsumeikan University, 1-1-1 Kusatsu, Shiga, 525-8577, Japan
| | - Takuji Hatakeyama
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
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7
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Chen M, Unikela KS, Ramalakshmi R, Li B, Darrigan C, Chrostowska A, Liu SY. A BN-Doped Cycloparaphenylene Debuts. Angew Chem Int Ed Engl 2020; 60:1556-1560. [PMID: 33021073 DOI: 10.1002/anie.202010556] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 09/08/2020] [Indexed: 11/09/2022]
Abstract
The first example of a BN-doped cycloparaphenylene BN-[10]CPP was synthesized and characterized. Its reactivity and photophysical properties were evaluated in direct comparison to its carbonaceous analogues Mes-[10]CPP and [10]CPP. While the photophysical properties of BN-[10]CPP remains similar to its carbonaceous analogues, the electronic structure changes associated with the introduction of a 1,2-azaborine BN heterocycle into a CPP scaffold enables facile and selective late-stage functionalizations that cannot be accomplished with carbonaceous CPPs. Specifically, Ir-catalyzed hydrogenation of BN-[10]CPP selectively reduces the BN heterocyclic ring, which upon hydrolysis produces a rare example of a macrocyclic paraphenylene 6 incorporating the versatile ketone functionality within the macrocyclic ring.
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Affiliation(s)
- Min Chen
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA
| | - Kiran S Unikela
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA
| | - Rongala Ramalakshmi
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA.,Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64000, Pau, France
| | - Bo Li
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA
| | - Clovis Darrigan
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64000, Pau, France
| | - Anna Chrostowska
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64000, Pau, France
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA.,Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64000, Pau, France
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8
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Chen M, Unikela KS, Ramalakshmi R, Li B, Darrigan C, Chrostowska A, Liu S. A BN‐Doped Cycloparaphenylene Debuts. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010556] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Min Chen
- Department of Chemistry Boston College Chestnut Hill MA 02467 USA
| | - Kiran S. Unikela
- Department of Chemistry Boston College Chestnut Hill MA 02467 USA
| | - Rongala Ramalakshmi
- Department of Chemistry Boston College Chestnut Hill MA 02467 USA
- Université de Pau et des Pays de l'Adour E2S UPPA, CNRS, IPREM, UMR 5254 64000 Pau France
| | - Bo Li
- Department of Chemistry Boston College Chestnut Hill MA 02467 USA
| | - Clovis Darrigan
- Université de Pau et des Pays de l'Adour E2S UPPA, CNRS, IPREM, UMR 5254 64000 Pau France
| | - Anna Chrostowska
- Université de Pau et des Pays de l'Adour E2S UPPA, CNRS, IPREM, UMR 5254 64000 Pau France
| | - Shih‐Yuan Liu
- Department of Chemistry Boston College Chestnut Hill MA 02467 USA
- Université de Pau et des Pays de l'Adour E2S UPPA, CNRS, IPREM, UMR 5254 64000 Pau France
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9
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Yang W, Krantz KE, Dickie DA, Molino A, Wilson DJD, Gilliard RJ. Crystalline BP‐Doped Phenanthryne via Photolysis of The Elusive Boraphosphaketene. Angew Chem Int Ed Engl 2020; 59:3971-3975. [DOI: 10.1002/anie.201916362] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Wenlong Yang
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
| | - Kelsie E. Krantz
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
| | - Diane A. Dickie
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
| | - Andrew Molino
- Department of Chemistry and Physics La Trobe Institute for Molecular Science La Trobe University Melbourne 3086 Victoria Australia
| | - David J. D. Wilson
- Department of Chemistry and Physics La Trobe Institute for Molecular Science La Trobe University Melbourne 3086 Victoria Australia
| | - Robert J. Gilliard
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
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10
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Yang W, Krantz KE, Dickie DA, Molino A, Wilson DJD, Gilliard RJ. Crystalline BP‐Doped Phenanthryne via Photolysis of The Elusive Boraphosphaketene. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916362] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wenlong Yang
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
| | - Kelsie E. Krantz
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
| | - Diane A. Dickie
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
| | - Andrew Molino
- Department of Chemistry and Physics La Trobe Institute for Molecular Science La Trobe University Melbourne 3086 Victoria Australia
| | - David J. D. Wilson
- Department of Chemistry and Physics La Trobe Institute for Molecular Science La Trobe University Melbourne 3086 Victoria Australia
| | - Robert J. Gilliard
- Department of Chemistry University of Virginia 409 McCormick Rd./ PO Box 400319 Charlottesville VA 22904 USA
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11
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Giustra ZX, Yang X, Chen M, Bettinger HF, Liu S. Accessing 1,2‐Substituted Cyclobutanes through 1,2‐Azaborine Photoisomerization. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912132] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | - Xinyu Yang
- Department of Chemistry Boston College Chestnut Hill MA 02467–3860 USA
| | - Min Chen
- Department of Chemistry Boston College Chestnut Hill MA 02467–3860 USA
| | - Holger F. Bettinger
- Institut für Organische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Shih‐Yuan Liu
- Department of Chemistry Boston College Chestnut Hill MA 02467–3860 USA
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12
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Giustra ZX, Yang X, Chen M, Bettinger HF, Liu SY. Accessing 1,2-Substituted Cyclobutanes through 1,2-Azaborine Photoisomerization. Angew Chem Int Ed Engl 2019; 58:18918-18922. [PMID: 31604006 DOI: 10.1002/anie.201912132] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Indexed: 01/02/2023]
Abstract
We provide a seminal example of the utility of the 1,2-azaborine motif as a 4C+1N+1B synthon in organic synthesis. Specifically, conditions for the practically scalable photoisomerization of 1,2-azaborine in a flow reactor are reported that furnish aminoborylated cyclobutane derivatives. The C-B bonds could also be functionalized to furnish a diverse set of highly substituted cyclobutanes.
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Affiliation(s)
- Zachary X Giustra
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Xinyu Yang
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Min Chen
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Holger F Bettinger
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
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13
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Ishikawa Y, Suzuki K, Yamashita M. 9-Aza-10-boraanthracene Stabilized by Coordination of an N-Heterocyclic Carbene and Its Methylated Cation: Synthesis, Structure, and Electronic Properties. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yutaro Ishikawa
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Katsunori Suzuki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
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14
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Zhang J, Jung H, Kim D, Park S, Chang S. Sequential C−H Borylation and N‐Demethylation of 1,1′‐Biphenylamines: Alternative Route to Polycyclic BN‐Heteroarenes. Angew Chem Int Ed Engl 2019; 58:7361-7365. [DOI: 10.1002/anie.201902499] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Jianbo Zhang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Hoimin Jung
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Dongwook Kim
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
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15
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Zhang J, Jung H, Kim D, Park S, Chang S. Sequential C−H Borylation and N‐Demethylation of 1,1′‐Biphenylamines: Alternative Route to Polycyclic BN‐Heteroarenes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201902499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianbo Zhang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Hoimin Jung
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Dongwook Kim
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon FunctionalizationsInstitute for Basic Science (IBS) Republic of Korea
- Department of ChemistryKorea Advanced Institute of Science & Technology (KAIST) Daejeon 34141 Republic of Korea
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16
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Tsuchiya S, Saito H, Nogi K, Yorimitsu H. Aromatic Metamorphosis of Indoles into 1,2-Benzazaborins. Org Lett 2019; 21:3855-3860. [PMID: 31063386 DOI: 10.1021/acs.orglett.9b01353] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Among the plethora of aromatic compounds, indoles represent a privileged class of substructures that is ubiquitous in natural products and pharmaceuticals. While numerous exocyclic functionalizations of indoles have provided access to a variety of useful derivatives, endocyclic transformations involving the cleavage of the C2-N bond remain challenging due to the high aromaticity and strength of this bond in indoles. Herein, we report the "aromatic metamorphosis" of indoles into 1,2-benzazaborins via the insertion of boron into the C2-N bond. This endocyclic insertion consists of a reductive ring-opening using lithium metal and a subsequent trapping of the resulting dianionic species with organoboronic esters. Considering that 1,2-azaborins have attracted increasing academic and industrial attention as BN isosteres of benzene, the counterintuitive aromatic metamorphosis presented herein can feasibly be expected to substantially advance the promising chemistry of 1,2-azaborins.
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Affiliation(s)
- Shun Tsuchiya
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
| | - Hayate Saito
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
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17
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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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18
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Cabrera-Trujillo JJ, Fernández I. Understanding the Diels-Alder reactivity of 1,2-azaborine analogues. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.06.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Edel K, Yang X, Ishibashi JSA, Lamm AN, Maichle-Mössmer C, Giustra ZX, Liu SY, Bettinger HF. The Dewar Isomer of 1,2-Dihydro-1,2-azaborinines: Isolation, Fragmentation, and Energy Storage. Angew Chem Int Ed Engl 2018; 57:5296-5300. [PMID: 29457683 PMCID: PMC6214188 DOI: 10.1002/anie.201712683] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Indexed: 11/11/2022]
Abstract
The photochemistry of 1,2-dihydro-1,2-azaborinine derivatives was studied under matrix isolation conditions and in solution. Photoisomerization occurs exclusively to the Dewar valence isomers upon irradiation with UV light (>280 nm) with high quantum yield (46 %). Further photolysis with UV light (254 nm) results in the formation of cyclobutadiene and an iminoborane derivative. The thermal electrocyclic ring-opening reaction of the Dewar valence isomer back to the 1,2-dihydro-1-tert-butyldimethylsilyl-2-mesityl-1,2-azaborinine has an activation barrier of (27.0±1.2) kcal mol-1 . In the presence of the Wilkinson catalyst, the ring opening occurs rapidly and exothermically (ΔH=(-48±1) kcal mol-1 ) at room temperature.
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Affiliation(s)
- Klara Edel
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Xinyu Yang
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | | | - Ashley N Lamm
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR, 97403-1253, USA
| | - Cäcilia Maichle-Mössmer
- Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Zachary X Giustra
- 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
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR, 97403-1253, USA
| | - Holger F Bettinger
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
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20
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Edel K, Yang X, Ishibashi JSA, Lamm AN, Maichle-Mössmer C, Giustra ZX, Liu SY, Bettinger HF. The Dewar Isomer of 1,2-Dihydro-1,2-azaborinines: Isolation, Fragmentation, and Energy Storage. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712683] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Klara Edel
- Institut für Organische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Xinyu Yang
- Department of Chemistry; Boston College; Chestnut Hill MA 02467-3860 USA
| | | | - Ashley N. Lamm
- Department of Chemistry and Biochemistry; University of Oregon; Eugene OR 97403-1253 USA
| | - Cäcilia Maichle-Mössmer
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Zachary X. Giustra
- 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
- Department of Chemistry and Biochemistry; University of Oregon; Eugene OR 97403-1253 USA
| | - Holger F. Bettinger
- Institut für Organische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
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21
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Hahn J, Biswas S, Maichle-Mössmer C, Schrenk C, Schnepf A, Bettinger HF. Borenium and boronium ions of 5,6-dihydro-dibenzo[c,e][1,2]azaborinine and the reaction with non-nucleophilic base: trapping of a dimer and a trimer of BN-phenanthryne by 4,4′-di-tert-butyl-2,2′-bipyridine. PURE APPL CHEM 2018. [DOI: 10.1515/pac-2017-1103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
6-Chloro-5,6-dihydro-dibenzo[c,e][1,2]azaborinine (1) reacts with pyridine derivatives to borenium or boronium ions. The boronium ion obtained from reaction with an excess of pyridine could be characterized structurally and transforms into the borenium ion in solution. The reaction of 1 with 2,2′-bipyridine (a) and derivatives (b: 6,6′-dimethyl; c: 4,4′-di-tert-butyl) results in spirocyclic boronium ions 8a–c of which 8b could be characterized by X-ray crystallography. Despite the chelate effect, the spirocyclic boronium ions readily undergo hydrolysis or alcoholysis. Treatment of the spirocyclic boronium ion 8c with potassium hexamethyl disilazide (KHMDS) results in neutral products that are monomers, dimers, or trimers of dibenzo[c,e][1,2]azaborinine (“BN-phenanthryne”) trapped with 4,4′-di-tert-butyl-2,2′-bipyridine by formation of B–C, B–N, or dative B–N bonds, indicative of deprotonation of NH and CH bonds of the boronium ion by KHMDS.
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Affiliation(s)
- Jennifer Hahn
- Institut für Organische Chemie , Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Sunanda Biswas
- Institut für Organische Chemie , Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Cäcilia Maichle-Mössmer
- Institut für Anorganische Chemie , Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Claudio Schrenk
- Institut für Anorganische Chemie , Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Andreas Schnepf
- Institut für Anorganische Chemie , Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
| | - Holger F. Bettinger
- Institut für Organische Chemie , Universität Tübingen , Auf der Morgenstelle 18 , 72076 Tübingen , Germany
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22
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Abstract
Upon reaction with either molecular oxygen or di-tert-butylperoxide in the presence of a simple copper(I) salt and an alcohol, a range of 1,2-azaborines readily exchange B-alkyl or B-aryl moieties for B-alkoxide fragments. This transformation allows alkyl and aryl groups to serve for the first time as removable protecting groups for the boron position of 1,2-azaborines during reactions that are not compatible with the easily modifiable B-alkoxide moiety. This reaction can be applied to synthesize a previously inaccessible BN isostere of ethylbenzene, a compound of interest in biomedical research. A sequence of epoxide ring opening using N-deprotonated 1,2-azaborines followed by an intramolecular version of the boron deprotection reaction can be applied to access the first examples of BN isosteres of dihydrobenzofurans and benzofurans, classes of compounds that are important to medicinal chemistry and natural product synthesis.
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Affiliation(s)
- Andrew W Baggett
- Department of Chemistry, Boston College , Chestnut Hill, Massachusetts 02467-3860, United States
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College , Chestnut Hill, Massachusetts 02467-3860, United States
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23
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Rakhi R, Suresh CH. A DFT study on 1,4-dihydro-1,4-azaborinine annulated linear polyacenes: Absorption spectra, singlet-triplet energy gap, aromaticity, and HOMO-LUMO energy modulation. J Comput Chem 2017; 38:2232-2240. [PMID: 28786164 DOI: 10.1002/jcc.24868] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 05/31/2017] [Accepted: 06/08/2017] [Indexed: 11/06/2022]
Abstract
Linear polyacene (LPA) mimics containing multiple heterocycles have been computationally designed by annulating 1,4-dihydro-1,4-azaborinine moieties to benzene (aB1 -aB5 ), naphthalene (aN1 -aN5 ), anthracene (aA1 -aA5 ), and tetracene (aT1 -aT5 ) cores. DFT studies conducted on them using M06L/6-311++G(d,p) method reveal a perfect planar structure for all and suggest the utilization of nitrogen lone pairs for aromatic π-electron delocalization. The computed values of aromaticity indices such as HOMA, NICS, and dehydrogenation energy (Edh ) of heterocycles support strong aromatic character for each six-membered ring in the LPA mimics. On the basis of the minimum value of the molecular electrostatic potential (Vmin ) observed on each LPA unit in the LPA mimics, the extended delocalization of π-electrons is verified. The energetic parameter Edh showed strong linear correlation with HOMA, NICS and Vmin parameters, which strongly supports the multidimensional character of aromaticity in LPA mimics. The electronic property modification is shown by the theoretical absorption spectra data and singlet-triplet energy gap (ΔEST ). The bandgap and ΔEST tunings are achieved for LPA mimics by selecting appropriate number of azaborinine type units and the size of LPA core used for annulation. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Ramachandran Rakhi
- Chemical Sciences and Technology Division, Academy of Scientific and Innovative Research (AcSIR), CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
| | - Cherumuttathu H Suresh
- Chemical Sciences and Technology Division, Academy of Scientific and Innovative Research (AcSIR), CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
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24
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Laramée-Milette B, Ferreira JG, Hanan GS. Solid-State NIR-Luminescence of 1H
-pyrido[1,2,3-de
]quinoxalini-4-ium Cationic Dyes. ChemistrySelect 2017. [DOI: 10.1002/slct.201700729] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Baptiste Laramée-Milette
- Département de Chimie; Université de Montréal; 5150, Ch. de la rampe, Pavillon J.-A. Bombardier H3T 2B1 Montréal, QC Canada
| | - Janaina G. Ferreira
- Département de Chimie; Université de Montréal; 5150, Ch. de la rampe, Pavillon J.-A. Bombardier H3T 2B1 Montréal, QC Canada
- Departamento de Química; Universidade Federal do Paraná, UFPR, CP 19081; 81531-970 Curitiba-Pr Brazil
| | - Garry S. Hanan
- Département de Chimie; Université de Montréal; 5150, Ch. de la rampe, Pavillon J.-A. Bombardier H3T 2B1 Montréal, QC Canada
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25
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Yruegas S, Martin CD. Expedient Synthesis of 1,2-Thiaborines by Means of Sulfur Insertion into Boroles. Chemistry 2016; 22:18358-18361. [DOI: 10.1002/chem.201604638] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Sam Yruegas
- Department of Chemistry and Biochemistry; Baylor University; One Bear Place #97348 Waco TX 76798 USA
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry; Baylor University; One Bear Place #97348 Waco TX 76798 USA
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26
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García-Rodeja Y, Fernández I. Factors Controlling the Reactivity and Selectivity of the Diels–Alder Reactions Involving 1,2-Azaborines. J Org Chem 2016; 81:6554-62. [DOI: 10.1021/acs.joc.6b01182] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yago García-Rodeja
- Departamento de Química
Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - Israel Fernández
- Departamento de Química
Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
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27
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Ren Y, Sezen M, Guo F, Jäkle F, Loo YL. [ d]-Carbon-carbon double bond engineering in diazaphosphepines: a pathway to modulate the chemical and electronic structures of heteropines. Chem Sci 2016; 7:4211-4219. [PMID: 30155067 PMCID: PMC6014086 DOI: 10.1039/c6sc00519e] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 03/15/2016] [Indexed: 11/21/2022] Open
Abstract
We have designed and synthesized the first examples of 7-membered diazaphosphepines using phosphorus-amine (P-N) chemistry. Different from previous functional protocols of heteropines, the installation of π-conjugated substituents having diverse chemistries at the [d]-C[double bond, length as m-dash]C double bond position of heteropine core allows us to effectively control the chemical and electronic structures in both the ground and excited states of these diazaphosphepines. This functionalization has led to a diverse set of crystal structures, which has in turn provided access to rich photophysical and redox properties. Of particular interest is the evidence for planar π-conjugated backbone in our non-aromatic heteropine and twisted intramolecular charge transfer, which have never been reported for heteropines. The introduction of electron-accepting substituents at [d]-position of diazaphosphepines results in heteropines that are more electron deficient than any heteropine reported to-date. As proof of concept, we have fabricated organic solar cells with heteropines as non-fullerene acceptors.
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Affiliation(s)
- Yi Ren
- Department of Chemical and Biological Engineering , Princeton University , NJ 08544 , USA .
| | - Melda Sezen
- Department of Chemical and Biological Engineering , Princeton University , NJ 08544 , USA .
| | - Fang Guo
- Department of Chemistry , Rutgers University , Newark , NJ 07102 , USA
| | - Frieder Jäkle
- Department of Chemistry , Rutgers University , Newark , NJ 07102 , USA
| | - Yueh-Lin Loo
- Department of Chemical and Biological Engineering , Princeton University , NJ 08544 , USA .
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28
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Schäfer M, Schäfer J, Dewhurst RD, Ewing WC, Krahfuß M, Kuntze-Fechner MW, Wehner M, Lambert C, Braunschweig H. Regioselective Catalytic and Stepwise Routes to Bulky, Functional-Group-Appended, and Luminescent 1,2-Azaborinines. Chemistry 2016; 22:8603-9. [PMID: 27166798 DOI: 10.1002/chem.201600653] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Indexed: 01/01/2023]
Abstract
The regioselective syntheses of 1,2-azaborinines is achieved using an unsymmetrical iminoborane through both catalytic and stepwise modular routes. The 1,2-azaborinine ring can be selectively functionalized in the 4- and/or 6-position through control of the stepwise reaction sequence, allowing access to vinyl-functionalized and redox-active, luminescent, donor-functionalized 1,2-azaborinines. The electrochemistry and photochemistry of a tetraarylamine-substituted 1,2-azaborinine are studied. Cyclic voltammetry of this compound, relative to a non-B,N-substituted reference molecule, showed an additional oxidation wave assigned to the oxidation of the azaborinine ring, while emission spectroscopy indicated that the azaborinine was significantly more fluorescent than the reference.
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Affiliation(s)
- Marius Schäfer
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Julian Schäfer
- Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Institut für Organische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Rian D Dewhurst
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - William C Ewing
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Mirjam Krahfuß
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Maximilian W Kuntze-Fechner
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Marius Wehner
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Christoph Lambert
- Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Institut für Organische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
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29
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Barnard JH, Yruegas S, Huang K, Martin CD. Ring expansion reactions of anti-aromatic boroles: a promising synthetic avenue to unsaturated boracycles. Chem Commun (Camb) 2016; 52:9985-91. [DOI: 10.1039/c6cc04330e] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The ability of anti-aromatic boroles to undergo ring expansion reactions with a broad range of substrates as an effective synthetic protocol towards a diverse array of 6-, 7-, and 8-membered boracycles is detailed in this review.
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Affiliation(s)
| | - Sam Yruegas
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
| | - Kexuan Huang
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
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30
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Yruegas S, Patterson DC, Martin CD. Oxygen insertion into boroles as a route to 1,2-oxaborines. Chem Commun (Camb) 2016; 52:6658-61. [DOI: 10.1039/c6cc02040b] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of 1,2-oxaborines is accomplishedviathe reaction of pentaarylboroles withN-methylmorpholine-N-oxideviaa 1,1-insertion reaction.
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Affiliation(s)
- Sam Yruegas
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
| | | | - Caleb D. Martin
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
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31
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Wang BJ, Groziak MP. Recent Developments in the Chemistry of Boron Heterocycles. ADVANCES IN HETEROCYCLIC CHEMISTRY 2016. [DOI: 10.1016/bs.aihch.2015.10.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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32
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Barnard JH, Brown PA, Shuford KL, Martin CD. 1,2-Phosphaborines: Hybrid Inorganic/Organic P-B Analogues of Benzene. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Barnard JH, Brown PA, Shuford KL, Martin CD. 1,2-Phosphaborines: Hybrid Inorganic/Organic P-B Analogues of Benzene. Angew Chem Int Ed Engl 2015; 54:12083-6. [DOI: 10.1002/anie.201507003] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Indexed: 11/06/2022]
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34
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McDonald SM, Mellerup SK, Peng J, Yang D, Li Q, Wang S. Thermal and Photolytic Transformation of NHC–B,N‐Heterocycles: Controlled Generation of Blue Fluorescent 1,3‐Azaborinine Derivatives and 1
H
‐Imidazo[1,2‐a]indoles by External Stimuli. Chemistry 2015; 21:13961-70. [DOI: 10.1002/chem.201502385] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Indexed: 01/07/2023]
Affiliation(s)
- Sean M. McDonald
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Soren K. Mellerup
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Jinbao Peng
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Dengtao Yang
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Quan‐Song Li
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion, Materials, School of Chemistry, Beijing Institute of Technology, Beijing, 100081 (P.R. China)
| | - Suning Wang
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion, Materials, School of Chemistry, Beijing Institute of Technology, Beijing, 100081 (P.R. China)
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35
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Matsui M, Ando S, Fukushima M, Shibata T, Kubota Y, Funabiki K. Fluorescence properties of indolenium carbocyanine dyes in solid state. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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36
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Yang DT, Radtke J, Mellerup SK, Yuan K, Wang X, Wagner M, Wang S. One-Pot Synthesis of Brightly Fluorescent Mes2B-Functionalized Indolizine Derivatives via Cycloaddition Reactions. Org Lett 2015; 17:2486-9. [PMID: 25915087 DOI: 10.1021/acs.orglett.5b00994] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four new BMes2-functionalized indolizine derivatives (Mes = mesityl) have been prepared via the cycloaddition reaction between pyrido[2,1-a]isoindole (A) or pyrrolo[1,2-a]pyridine (B) and BMes2-containing alkynes. All four compounds are brightly blue or blue-green fluorescent with λ(em) = 428-495 nm and Φ = 0.27-0.68, depending on the substitution position of the BMes2 group. Experimental and TD-DFT computational data indicated that the primary electronic transitions responsible for the fluorescence of 1-4 are from HOMO to LUMO (π → π*) rather than charge transfer from N → B, which is in agreement with previous findings suggesting that the lone-pair on N is delocalized throughout the N-heterocycles.
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Affiliation(s)
- Deng-Tao Yang
- †Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Julian Radtke
- ‡Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany
| | - Soren K Mellerup
- †Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Kang Yuan
- †Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Xiang Wang
- †Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Matthias Wagner
- ‡Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany
| | - Suning Wang
- †Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
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37
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Baggett AW, Vasiliu M, Li B, Dixon DA, Liu SY. Late-Stage Functionalization of 1,2-Dihydro-1,2-azaborines via Regioselective Iridium-Catalyzed C-H Borylation: The Development of a New N,N-Bidentate Ligand Scaffold. J Am Chem Soc 2015; 137:5536-41. [PMID: 25870116 DOI: 10.1021/jacs.5b01916] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first general late-stage functionalization of monocyclic 1,2-azaborines at the C(6) position is described. Ir-catalyzed C-H borylation occurs regioselectively at the C(6) position of B-substituted 1,2-azaborines and is compatible with a range of substitution patterns at boron (e.g., hydride, alkoxide, alkyl, and aryl substituents). Subsequent Suzuki cross coupling with aryl- and heteroaryl bromides furnishes 1,2-azaborine-based biaryl compounds including 6-[pyrid-2-yl]-1,2-azaborines that represent novel κ(2)-N,N-bidentate ligands. The 6-[pyrid-2-yl]-B-Me-1,2-azaborine ligand has been demonstrated to form an emissive coordination complex with dimesitylboron that exhibits bathochromically shifted absorption and emission maxima and a higher photoluminescence quantum yield compared to its carbonaceous analogue.
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Affiliation(s)
- Andrew W Baggett
- †Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467-3860, United States.,‡Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Monica Vasiliu
- §Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0036, United States
| | - Bo Li
- †Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467-3860, United States
| | - David A Dixon
- §Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0036, United States
| | - Shih-Yuan Liu
- †Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467-3860, United States.,‡Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
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Liu X, Wu P, Li J, Cui C. Synthesis of 1,2-borazaronaphthalenes from imines by base-promoted borylation of C-H bond. J Org Chem 2015; 80:3737-44. [PMID: 25710256 DOI: 10.1021/jo5029437] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A new route from benzylic imines permits the synthesis of 1,2-borazaronaphthalenes in good yields. The reaction involves formation of the enamidyl dibromoborane, which undergoes base-promoted borylation of the nearby aromatic C-H bond. Electrophilic attack of the boron species onto the benzylic arene is supported by the slow borylation of arenes substituted with electron-withdrawing groups. The resultant boron bromides can be easily substituted with lithium reagents to provide a range of products. The electronic properties of these 1,2-borazaronaphthalene derivatives have been investigated by UV-vis and fluorescence spectroscopy.
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Affiliation(s)
- Xinwang Liu
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Cooperative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People's Republic of China
| | - Pengbo Wu
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Cooperative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People's Republic of China
| | - Jianfeng Li
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Cooperative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People's Republic of China
| | - Chunming Cui
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Cooperative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People's Republic of China
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Saito M, Matsumoto K, Fujita M, Minoura M. Unexpected Dehalogenation Reactions of Dichloroborane Bearing a NCN-Pincer Ligand: Formation of a Borenium Salt. HETEROATOM CHEMISTRY 2014. [DOI: 10.1002/hc.21211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Masaichi Saito
- Department of Chemistry; Graduate School of Science and Engineering; Saitama University; Sakura-ku Saitama 338-8570 Japan
| | - Kaori Matsumoto
- Department of Chemistry; Graduate School of Science and Engineering; Saitama University; Sakura-ku Saitama 338-8570 Japan
| | - Masahiro Fujita
- Department of Chemistry; Graduate School of Science and Engineering; Saitama University; Sakura-ku Saitama 338-8570 Japan
| | - Mao Minoura
- Department of Chemistry; College of Science; Rikkyo University; Toshima-ku Tokyo 171-8501 Japan
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Brown AN, Zakharov LN, Mikulas T, Dixon DA, Liu SY. Rhodium-catalyzed B-H activation of 1,2-azaborines: synthesis and characterization of BN isosteres of stilbenes. Org Lett 2014; 16:3340-3. [PMID: 24916200 PMCID: PMC4068778 DOI: 10.1021/ol501362w] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 12/25/2022]
Abstract
The first example of catalytic B-H activation of azaborines leading to a new family of stilbene derivatives through dehydrogenative borylation is reported. Ten 1,2-azaborine-based BN isosteres of stilbenes have been synthesized using this method, including a BN isostere of a biologically active stilbene. It is demonstrated that BN/CC isosterism in the context of stilbenes can lead to significant changes in the observed photophysical properties such as higher quantum yield and a larger Stokes shift. Direct comparative analysis of BN stilbene 3g and its carbonaceous counterpart 6g is consistent with a stronger charge-transfer character of the excited state exhibited by 3g in which the 1,2-azaborine heterocycle serves as a better electron donor than the corresponding arene.
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Affiliation(s)
- Alec N. Brown
- Department
of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Lev N. Zakharov
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Tanya Mikulas
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - David A. Dixon
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Shih-Yuan Liu
- Department
of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
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Abbey ER, Lamm AN, Baggett AW, Zakharov LN, Liu SY. Protecting group-free synthesis of 1,2-azaborines: a simple approach to the construction of BN-benzenoids. J Am Chem Soc 2013; 135:12908-13. [PMID: 23914914 DOI: 10.1021/ja4073436] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The protecting group-free synthesis of a versatile 1,2-azaborine synthon 5 is described. Previously inaccessible 1,2-azaborine derivatives, including the BN isostere of phenyl phenylacetate and BN1 triphenylmethane were prepared from 5 and characterized. The structural investigation of BN phenyl phenylacetate revealed the presence of a unique NH-carbonyl hydrogen bond that is not present in the corresponding carbonaceous analogue. The methyne CH in BN triphenylmethane was found to be less acidic than the corresponding proton in triphenylmethane. The gram-quantity synthesis of the parent 1,2-azaborine 4 was demonstrated, which enabled the characterization of its boiling point, density, refractive index, and its polarity on the ET(30) scale.
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Affiliation(s)
- Eric R Abbey
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, USA
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Harlow GP, Zakharov LN, Wu G, Liu SY. Thermodynamically Controlled, Dynamic Binding of Diols to a 1,2-BN Cyclohexane Derivative. Organometallics 2013; 32:6650-6653. [PMID: 25798022 DOI: 10.1021/om400697r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reversible covalent binding of diols to an N-Bn 1,2-BN cyclohexane has been studied by 11B and 1H NMR spectroscopy and single-crystal X-ray diffraction analysis. The activation barrier for the reversible B-N Lewis acid-base interaction has been measured by variable-temperature NMR with bound (2R,3R)-(-)-2,3-butanediol (Tc = -40 °C, ΔG‡ = 11.2 ± 0.2 kcal mol-1). Deuterium labeling experiments demonstrate that ligand exchange is reversible and rapid at room temperature, and competitive binding studies establish diol association as a thermodynamically controlled process.
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Affiliation(s)
- Gregory P Harlow
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Lev N Zakharov
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Gang Wu
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Shih-Yuan Liu
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
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Su MD. Mechanistic Investigations on the Photoisomerization Reactions of 1,2-Dihydro-1,2-Azaborine. Chemistry 2013; 19:9663-7. [DOI: 10.1002/chem.201204537] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 03/14/2013] [Indexed: 11/11/2022]
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Kamiński R, Jarzembska KN, Domagała S. CLUSTERGEN: a program for molecular cluster generation from crystallographic data. J Appl Crystallogr 2013. [DOI: 10.1107/s0021889813002173] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A new program,CLUSTERGEN, for molecular cluster generation is introduced.CLUSTERGENprovides the quantum mechanics/molecular mechanics (QM/MM) input files for program packages such asADF[Baerendset al.(2012). Vrije Universiteit, Amsterdam, The Netherlands] andGAUSSIAN[Frischet al.(2009). Gaussian Inc., Pittsburgh, Pennsylvania, USA]. Additionally, it prints out a standardCRYSTAL[Dovesiet al.(2009). University of Turin, Italy] input and, in general, facilitates file-format manipulation. TheCLUSTERGENprogram is supported by an extensive manual and a user-friendly graphical interface. The code is freely available and carefully commented, which makes it easily modifiable. Exemplary applications ofCLUSTERGENconcerning QM/MM calculations and derivation of nucleus-independent chemical shift indices are demonstrated.
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Taniguchi T, Wang J, Irle S, Yamaguchi S. TICT fluorescence of N-borylated 2,5-diarylpyrroles: a gear like dual motion in the excited state. Dalton Trans 2013; 42:620-4. [DOI: 10.1039/c2dt32134c] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Brough SA, Lamm AN, Liu SY, Bettinger HF. Photoisomerization of 1,2-dihydro-1,2-azaborine: a matrix isolation study. Angew Chem Int Ed Engl 2012; 51:10880-3. [PMID: 23023601 PMCID: PMC3517036 DOI: 10.1002/anie.201203546] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 06/29/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Sarah A. Brough
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Ashley N. Lamm
- Department of Chemistry, University of Oregon, Eugene, OR 97403-1253, USA,
| | - Shih-Yuan Liu
- Department of Chemistry, University of Oregon, Eugene, OR 97403-1253, USA,
| | - Holger F. Bettinger
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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Brough SA, Lamm AN, Liu SY, Bettinger HF. Photoisomerisierung von 1,2-Dihydro-1,2-azaborin - eine Matrixisolationsstudie. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203546] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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50
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Humboldt and Bessel Research Awards, Camille Dreyfus Teacher-Scholar Awards. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/anie.201204696] [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]
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