1
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Sun M, Feng L, Lu JY. Breaking the Base Barrier: Cu(II)-Mediated C-H Heteroarylation of o-Carboranes with Base-Sensitive Heteroaryl Halides. Org Lett 2024; 26:3697-3702. [PMID: 38685484 DOI: 10.1021/acs.orglett.4c00489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
While cage C-arylation reactions using strong bases are among the most frequently used transformations in carborane chemistry, there has been no general solution to allow for the use of weak bases in the reaction. Moreover, base-metal-promoted C-H heteroarylation with base-sensitive heteroaryl halides remained elusive. Herein, copper-mediated cage C-H (hetero)arylation has been achieved without the need for strong bases, leading to the facile synthesis of a wide range of C-(hetero)arylated carboranes in good to excellent yields with a broad substrate scope and good functional group compatibility.
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Affiliation(s)
- Mengfan Sun
- School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China
| | - Leijun Feng
- School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China
| | - Ju-You Lu
- School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China
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2
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Sun ZZ, Gao P, Yang Y, Wang T, Wu XJ, Wang YQ. Synthesis of Carboranylated Dihydropyrrolo[1,2- a]quinoxalines and Dihydroindolo[1,2- a]quinoxalines by BF 3·OEt 2-Catalyzed Heterocyclization of C-Formyl- o-carboranes and Investigation of Their Oxidation Stability. J Org Chem 2024; 89:3573-3579. [PMID: 38377489 DOI: 10.1021/acs.joc.3c02443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
A BF3·OEt2-catalyzed synthesis of carboranylated dihydropyrrolo[1,2-a]quinoxalines and dihydroindolo[1,2-a]quinoxalines in 30-99% yields is presented through the heterocyclization of various C-modified C-formyl-o-carboranes with 1-(2-aminophenyl)-pyrroles/indoles. A systematic comparative investigation of their oxidation stability in air confirmed that 4-carboranyl-4,5-dihydropyrrolo[1,2-a]quinoxaline had better stability than the 4-phenyl analogue. A cage-deboronation reaction for N-acetyl-substituted carboranylated dihydropyrrolo[1,2-a]quinoxaline produced the corresponding 7,8-nido-carborane cesium salt. A kinetic resolution was also realized to obtain an optically pure carboranylated N-heterocycle scaffold bearing a carborane cage carbon-bonded chiral stereocenter.
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Affiliation(s)
- Zhen-Zhen Sun
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan 475004, P. R. China
| | - Pan Gao
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan 475004, P. R. China
| | - Yong Yang
- Zhengzhou Yuanli Biological Technology Co., Ltd., Zhengzhou, Henan 450000, P. R. China
| | - Tao Wang
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan 475004, P. R. China
| | - Xiao-Jun Wu
- Zhengzhou Yuanli Biological Technology Co., Ltd., Zhengzhou, Henan 450000, P. R. China
| | - You-Qing Wang
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan 475004, P. R. China
- Zhengzhou Yuanli Biological Technology Co., Ltd., Zhengzhou, Henan 450000, P. R. China
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3
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Zhang QS, He L, Liu Q, Chen XY. Charge Transfer Complex-Enabled Synthesis of (Hetero)arylated m-Carboranes from m-Carborane Phosphonium Salts. Org Lett 2023; 25:5768-5773. [PMID: 37534925 DOI: 10.1021/acs.orglett.3c01989] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
A photoinduced charge transfer complex (CTC)-enabled photoreduction of carborane phosphonium salts for the cage carbon (hetero)arylation of carboranes was developed. It offers a convenient approach for introducing a wide range of aryl and heteroaryl groups, such as pyrroles, thiophenes, indoles, thianaphthenes, benzofurans, pyridines, and benzenes, into carboranes. This strategy offers operational simplicity, mild reaction conditions, and a broad substrate scope, making it highly advantageous.
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Affiliation(s)
- Qing-Shuang Zhang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang 832000, People's Republic of China
| | - Lin He
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang 832000, People's Republic of China
| | - Qiang Liu
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Xiang-Yu Chen
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China
- Binzhou Institute of Technology, Weiqiao-UCAS Science and Technology Park, Binzhou 256606, China
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4
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Ochi J, Yuhara K, Tanaka K, Chujo Y. Controlling the Dual-Emission Character of Aryl-Modified o-Carboranes by Intramolecular CH⋅⋅⋅O Interaction Sites. Chemistry 2022; 28:e202200155. [PMID: 35170101 DOI: 10.1002/chem.202200155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Indexed: 01/18/2023]
Abstract
It is still challenging to realize a dual-emission system, in which two luminescent bands simultaneously appear by photoexcitation, in solid with organic dyes due to the difficulty in regulation of electronic properties in the excited state and concentration quenching. o-Carborane is known to be a versatile platform for constructing solid-state emitters since the sphere boron cluster is favorable for suppressing intermolecular interactions and subsequently concentration quenching. Here, we show solid-state dual-emissive o-carborane derivatives. We prepared 4 types of o-carborane derivatives and found dual-emission behaviors both in solution and solid states. By regulating the rotation at the o-carborane unit with the intramolecular Ccage H⋅⋅⋅O interaction, the dual-emission intensity ratios were changed. Finally, it was demonstrated that the overall photoluminescence spectra can be estimated using the binding energy of intramolecular interactions.
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Affiliation(s)
- Junki Ochi
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Kazuhiro Yuhara
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Kazuo Tanaka
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yoshiki Chujo
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
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5
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Ni H, Lu Z, Xie Z. Light-promoted copper-catalyzed cage C-arylation of o-carboranes: facile synthesis of 1-aryl- o-carboranes and o-carborane-fused cyclics. NEW J CHEM 2021. [DOI: 10.1039/d0nj02029j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Light-promoted, copper catalyzed cage C–H arylation of o-carboranes with aryl halides has been achieved, leading to the facile synthesis of a variety of 1-aryl-o-carboranes and o-carborane-fused cyclics.
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Affiliation(s)
- Hangcheng Ni
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Zhenpin Lu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
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6
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Lu JY, Zhao B, Du Y, Yang J, Lu J. Transition-metal-free direct nucleophilic substitution of carboranyllithium and 2-halopyridines. Org Biomol Chem 2019; 17:7438-7441. [PMID: 31169281 DOI: 10.1039/c9ob00978g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A practical and efficient C(cage)-heteroarylation of carborane is presented, via direct nucleophilic substitution of carboranyllithium with 2-halopyridines. This reaction does not need the aid of any transition metal and utilizes readily available carboranyllithium nucleophiles, thereby avoiding transmetalation of carboranyllithium. The process exhibits a broad scope, and a vast array of 2-halopyridines have proven to be suitable substrates. The method serves as a complement to C(cage)-arylation reactions and may find wide applications in materials science and medicinal and coordination chemistry.
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Affiliation(s)
- Ju-You Lu
- Laboratory of Green Catalysis and Reaction Engineering of Haikou, Hainan Provincial Fine Chemical Engineering Research Center, School of Sciences, Hainan University, Haikou 570228, China. and State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an, Shaanxi 710065, China.
| | - Bo Zhao
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an, Shaanxi 710065, China.
| | - Yongmei Du
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an, Shaanxi 710065, China.
| | - Jianxin Yang
- Laboratory of Green Catalysis and Reaction Engineering of Haikou, Hainan Provincial Fine Chemical Engineering Research Center, School of Sciences, Hainan University, Haikou 570228, China.
| | - Jian Lu
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an, Shaanxi 710065, China.
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7
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Keskar K, Zepeda-Velazquez C, Dokuburra CB, Jenkins HA, McNulty J. The synthesis of densely functionalised α-acyloxy enaminals and enaminones via a novel homogeneous silver(i) catalysed rearrangement. Chem Commun (Camb) 2019; 55:10868-10871. [DOI: 10.1039/c9cc05614a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A synthesis of densely functionalised α-acyloxy enaminals and enaminones via a novel homogeneous silver(i) catalyzed rearrangement of 1-acyloxy-3-azido ketones is reported.
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Affiliation(s)
- Kunal Keskar
- Department of Chemistry & Chemical Biology
- McMaster University
- Hamilton
- Canada
| | | | | | - Hilary A. Jenkins
- Department of Chemistry & Chemical Biology
- McMaster University
- Hamilton
- Canada
| | - James McNulty
- Department of Chemistry & Chemical Biology
- McMaster University
- Hamilton
- Canada
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8
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Sterically encumbered dianionic dicarboranyl pincer ligand (C5H3N)(C2B10H11)2 and its CNC Nickel(II) complex. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Ni H, Qiu Z, Xie Z. Photoarylation of Iodocarboranes with Unactivated (Hetero)Arenes: Facile Synthesis of 1,2‐[(Hetero)Aryl]
n
‐
o
‐Carboranes (
n
=1,2) and
o
‐Carborane‐Fused Cyclics. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610810] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Hangcheng Ni
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, N.T. Hong Kong China
| | - Zaozao Qiu
- Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong Shatin, N.T. Hong Kong China
- Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai China
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10
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Ni H, Qiu Z, Xie Z. Photoarylation of Iodocarboranes with Unactivated (Hetero)Arenes: Facile Synthesis of 1,2-[(Hetero)Aryl] n -o-Carboranes (n=1,2) and o-Carborane-Fused Cyclics. Angew Chem Int Ed Engl 2016; 56:712-716. [PMID: 27990728 DOI: 10.1002/anie.201610810] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Indexed: 01/03/2023]
Abstract
Photoarylation of iodocarboranes with unactivated arenes/heteroarenes at room temperature has been achieved, for the first time, thus leading to the facile synthesis of a large variety of cage carbon mono(hetero)arylated and di(hetero)arylated o-carboranes. This work represents a clean, efficient, transition-metal-free, and cheap synthesis of functionalized carboranes, which has significant advantages over the known methods.
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Affiliation(s)
- Hangcheng Ni
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Zaozao Qiu
- Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.,Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
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11
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Etaiw SEH, Salem IA, Tawfik A. Silver and Copper-Supramolecular Coordination Polymers Inspired Alkyne–Azide Click Reactions. J Inorg Organomet Polym Mater 2016. [DOI: 10.1007/s10904-016-0465-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Axtell JC, Kirlikovali KO, Djurovich PI, Jung D, Nguyen VT, Munekiyo B, Royappa AT, Rheingold AL, Spokoyny AM. Blue Phosphorescent Zwitterionic Iridium(III) Complexes Featuring Weakly Coordinating nido-Carborane-Based Ligands. J Am Chem Soc 2016; 138:15758-15765. [PMID: 27934013 DOI: 10.1021/jacs.6b10232] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We report the development of a new class of phosphorescent zwitterionic bis(heteroleptic) Ir(III) compounds containing pyridyl ligands with weakly coordinating nido-carboranyl substituents. Treatment of phenylpyridine-based Ir(III) precursors with C-substituted ortho-carboranylpyridines in 2-ethoxyethanol results in a facile carborane deboronation and the formation of robust and highly luminescent metal complexes. The resulting nido-carboranyl fragments associate with the cationic Ir(III) center through primarily electrostatic interactions. These compounds phosphoresce at blue wavelengths (450-470 nm) both in a poly(methyl methacrylate) (PMMA) matrix and in solution at 77 K. These complexes display structural stability at temperatures beyond 300 °C and quantum yields greater than 40%. Importantly, the observed quantum yields correspond to a dramatic 10-fold enhancement over the previously reported Ir(III) congeners featuring carboranyl-containing ligands in which the boron cluster is covalently attached to the metal. Ultimately, this work suggests that the use of a ligand framework containing a weakly coordinating anionic component can provide a new avenue for designing efficient Ir(III)-based phosphorescent emitters.
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Affiliation(s)
- Jonathan C Axtell
- Department of Chemistry and Biochemistry, University of California, Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Kent O Kirlikovali
- Department of Chemistry and Biochemistry, University of California, Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Peter I Djurovich
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Dahee Jung
- Department of Chemistry and Biochemistry, University of California, Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Vinh T Nguyen
- Department of Chemistry and Biochemistry, University of California, Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Brian Munekiyo
- Department of Chemistry and Biochemistry, University of California, Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - A Timothy Royappa
- Department of Chemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093, United States.,Department of Chemistry, University of West Florida , 11000 University Parkway, Pensacola, Florida 32514, United States
| | - Arnold L Rheingold
- Department of Chemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Alexander M Spokoyny
- Department of Chemistry and Biochemistry, University of California, Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States.,California NanoSystems Institute (CNSI), University of California, Los Angeles , 570 Westwood Plaza, Los Angeles, California 90095, United States
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13
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Li X, Tong X, Yan H, Lu C, Zhao Q, Huang W. A Convenient Approach To Synthesizeo-Carborane-Functionalized Phosphorescent Iridium(III) Complexes for Endocellular Hypoxia Imaging. Chemistry 2016; 22:17282-17290. [DOI: 10.1002/chem.201603340] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Xiang Li
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Xiao Tong
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials; Nanjing University of Posts and Telecommunications; Nanjing 210023 P.R. China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Changsheng Lu
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Qiang Zhao
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials; Nanjing University of Posts and Telecommunications; Nanjing 210023 P.R. China
| | - Wei Huang
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials; Nanjing University of Posts and Telecommunications; Nanjing 210023 P.R. China
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14
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Lu JY, Wan H, Zhang J, Wang Z, Li Y, Du Y, Li C, Liu ZT, Liu ZW, Lu J. Palladium-Catalyzed Direct Cross-Coupling of Carboranyllithium with (Hetero)Aryl Halides. Chemistry 2016; 22:17542-17546. [DOI: 10.1002/chem.201603967] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Indexed: 12/17/2022]
Affiliation(s)
- Ju-You Lu
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Hong Wan
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Jianwei Zhang
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Zhixuan Wang
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Yang Li
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Yongmei Du
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Chunying Li
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
| | - Zhao-Tie Liu
- Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education); School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710119 P. R. China
| | - Zhong-Wen Liu
- Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education); School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710119 P. R. China
| | - Jian Lu
- State Key Laboratory of Fluorine & Nitrogen Chemicals; Xi'an Modern Chemistry Research Institute; Xi'an 710065 P. R. China
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15
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Abstract
In this study, the mechanism of AgAAC reaction has been studied by quantum mechanical calculations to gain insights into this promising reaction and the first successful application of a Ag catalyst alone in AAC.
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Affiliation(s)
- Esra Boz
- Department of Chemistry
- Istanbul Technical University
- Istanbul
- Turkey
| | - Nurcan Ş. Tüzün
- Department of Chemistry
- Istanbul Technical University
- Istanbul
- Turkey
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16
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Li X, Yan H, Zhao Q. Carboranes as a Tool to Tune Phosphorescence. Chemistry 2015; 22:1888-1898. [DOI: 10.1002/chem.201503456] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Xiang Li
- State Key Laboratory of Coordination Chemistry; Nanjing University; Nanjing 210093 P. R. China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry; Nanjing University; Nanjing 210093 P. R. China
| | - Qiang Zhao
- Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials; Nanjing University of Posts and Telecommunications; Nanjing 210023 P. R. China
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17
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Quan Y, Xie Z. Palladium-Catalyzed Regioselective Diarylation of o-Carboranes By Direct Cage B-H Activation. Angew Chem Int Ed Engl 2015; 55:1295-8. [PMID: 26463595 DOI: 10.1002/anie.201507697] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Indexed: 11/11/2022]
Abstract
Palladium-catalyzed intermolecular coupling of o-carborane with aromatics by direct cage B-H bond activation has been achieved, leading to the synthesis of a series of cage B(4,5)-diarylated-o-carboranes in high yields with excellent regioselectivity. Traceless directing group -COOH plays a crucial role for site- and di-selectivity of such intermolecular coupling reaction. A Pd(II)-Pd(IV)-Pd(II) catalytic cycle is proposed to be responsible for the stepwise arylation.
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Affiliation(s)
- Yangjian Quan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
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18
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Quan Y, Xie Z. Palladium-Catalyzed Regioselective Diarylation of o
-Carboranes By Direct Cage B−H Activation. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507697] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yangjian Quan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong, Shatin; N.T. Hong Kong China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; The Chinese University of Hong Kong, Shatin; N.T. Hong Kong China
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19
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Abstract
Silver is a less expensive noble metal. Superior alkynophilicity due to π-coordination with the carbon-carbon triple bond makes silver salts ideal catalysts for alkyne-based organic reactions. This review highlights the progress in alkyne chemistry via silver catalysis primarily over the past five years (ca. 2010-2014). The discussion is developed in terms of the bond type formed with the acetylenic carbon (i.e., C-C, C-N, C-O, C-Halo, C-P and C-B). Compared with other coinage metals such as Au and Cu, silver catalysis is frequently observed to be unique. This critical review clearly indicates that silver catalysis provides a significant impetus to the rapid evolution of alkyne-based organic reactions, such as alkynylation, hydrofunctionalization, cycloaddition, cycloisomerization, and cascade reactions.
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Affiliation(s)
- Guichun Fang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China.
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20
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Tang C, Xie Z. Nickel-Catalyzed Cross-Coupling Reactions ofo-Carboranyl with Aryl Iodides: Facile Synthesis of 1-Aryl-o-Carboranes and 1,2-Diaryl-o-Carboranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502502] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Tang C, Xie Z. Nickel-Catalyzed Cross-Coupling Reactions ofo-Carboranyl with Aryl Iodides: Facile Synthesis of 1-Aryl-o-Carboranes and 1,2-Diaryl-o-Carboranes. Angew Chem Int Ed Engl 2015; 54:7662-5. [DOI: 10.1002/anie.201502502] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Indexed: 11/09/2022]
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22
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23
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Kahlert J, Böhling L, Brockhinke A, Stammler HG, Neumann B, Rendina LM, Low PJ, Weber L, Fox MA. Syntheses and reductions of C-dimesitylboryl-1,2-dicarba-closo-dodecaboranes. Dalton Trans 2015; 44:9766-81. [DOI: 10.1039/c5dt00758e] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An investigation ofC-dimesitylboryl-ortho-carboranes, 1-(BMes2)-2-R-1,2-C2B10H10(1and2), reveals that the carborane is the electron-acceptor and the mesityl group is the electron-donor in these dyads.
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Affiliation(s)
- Jan Kahlert
- Fakultät für Chemie der Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Lena Böhling
- Fakultät für Chemie der Universität Bielefeld
- 33615 Bielefeld
- Germany
| | | | | | - Beate Neumann
- Fakultät für Chemie der Universität Bielefeld
- 33615 Bielefeld
- Germany
| | | | - Paul J. Low
- School of Chemistry and Biochemistry
- University of Western Australia
- Crawley
- Australia
| | - Lothar Weber
- Fakultät für Chemie der Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Mark A. Fox
- Department of Chemistry
- Durham University
- Durham DH1 3LE
- UK
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