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Tang J, Kong J, Xu H, Jiang ZJ, She Y, Bai J, Tang B, Chen J, Gao Z, Gao K. Multideuteration of Nitroaromatics by Silver-Catalyzed Hydrogen-Isotope Exchange. J Org Chem 2023; 88:1560-1567. [PMID: 36634252 DOI: 10.1021/acs.joc.2c02618] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Silver-catalyzed deuteration of nitroaromatics has been achieved using D2O as the deuterium source. Distinct from the well-established directing group-guided hydrogen-isotope exchange, this protocol showed an interesting deuteration pattern, where considerable deuterium accumulation was observed around the aromatic rings. Controlling experiments suggested that the deuteration was initiated by a silver-promoted C-H activation. Therefore, a tentative two-stage deuteration mechanism involving aryl-silver species was proposed to explain the deuteration on meta- and para-positions.
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Affiliation(s)
- Jianbo Tang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.,School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China
| | - Junhua Kong
- School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China
| | - Hui Xu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.,School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China
| | - Zhi-Jiang Jiang
- School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China
| | - Yifan She
- School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China
| | - Jianfei Bai
- School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China
| | - Bencan Tang
- Key Laboratory for Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, The University of Nottingham Ningbo China, Ningbo 315100, P. R. China.,Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, Ningbo 315100, P. R. China
| | - Jia Chen
- School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China.,Ningbo Cuiying Chemical Technology Co. Ltd., Ningbo 315100, P. R. China
| | - Zhanghua Gao
- School of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, P. R. China.,Ningbo Cuiying Chemical Technology Co. Ltd., Ningbo 315100, P. R. China
| | - Kun Gao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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Li G, Lavagnino MN, Ali SZ, Hu S, Radosevich AT. Tandem C/N-Difunctionalization of Nitroarenes: Reductive Amination and Annulation by a Ring Expansion/Contraction Sequence. J Am Chem Soc 2023; 145:41-46. [PMID: 36562776 PMCID: PMC9839621 DOI: 10.1021/jacs.2c12450] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A synthetic method for the reductive transformation of nitroarenes into ortho-aminated and -annulated products is reported. The method operates via the exhaustive deoxygenation of nitroarenes by an organophosphorus catalyst and a mild terminal reductant to access aryl nitrenes, which after ring expansion, are trapped by amine nucleophiles to give dearomatized 2-amino-3H-azepines. Treatment of these ring-expanded intermediates with acyl electrophiles triggers 6π electrocyclization to extrude the nitrogen atom and restore aromaticity of the phenyl ring, which delivers via C-H functionalization 2-aminoanilide and benzimidazole products.
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Affiliation(s)
- Gen Li
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
| | - Marissa N. Lavagnino
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
| | - Siraj Z. Ali
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
| | - Shicheng Hu
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
| | - Alexander T. Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
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Shao XZ, Xu GY, Fan W, Zhang S, Li MB. Photo-induced redox cascade reaction of nitroarenes and amines. Org Chem Front 2023. [DOI: 10.1039/d2qo01743a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A photo-induced redox cascade reaction has been developed for the chemoselective construction of isoxazolidine derivatives from stable and easily available nitroarenes and amines.
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Affiliation(s)
- Xing-Zhuo Shao
- Institute of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, P. R. China
| | - Guo-Yong Xu
- Institute of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, P. R. China
| | - Weigang Fan
- Institute of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, P. R. China
| | - Sheng Zhang
- Institute of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, P. R. China
| | - Man-Bo Li
- Institute of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, P. R. China
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Electrochemical borylation of nitroarenes. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1470-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Mondal K, Ghosh S, Hajra A. Transition-metal-catalyzed ortho C-H functionalization of 2-arylquinoxalines. Org Biomol Chem 2022; 20:7361-7376. [PMID: 36107011 DOI: 10.1039/d2ob01119k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, direct C-H bond activation and functionalization has become a prodigious and hot topic among synthetic organic chemists due to its step-economic nature and substantial synthetic versatility. On the other hand, quinoxaline, a fused bicycle of benzene and pyrazine, has omnipresent applications in medicinal-, industrial- and materials chemistry. The presence of the N-1 atom in 2-arylquinoxaline enables chelation formation with a metal catalyst leading to the formation of ortho-substituted products. In this review, all articles related to the ortho C-H bond functionalization of 2-arylquinoxalines published up to May 2022 are highlighted.
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Affiliation(s)
- Koushik Mondal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
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Ghosh S, Pyne P, Ghosh A, Hajra A. Ortho C-H Functionalizations of 2-Aryl-2H-Indazoles. CHEM REC 2022; 22:e202200158. [PMID: 35866505 DOI: 10.1002/tcr.202200158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 11/10/2022]
Abstract
C-H Functionalization is ubiquitously considered as a powerful, efficient and handy tool for installing various functional groups in complex organic heterocycles in an easier and step-economic way. Similarly, indazole is endowed as a potent heterocycle and is eminent for its profound impact in biological, medicinal and industrial chemistry. In this scenario, C-H functionalization at the selective ortho position of 2-arylindazole in assistance of a metal catalyst is also becoming an appealing approach in synthetic organic chemistry. This review addressed the recent findings and developments on ortho C-H functionalization of 2-aryl-2H-indazazoles with literature coverage extending from 2018 to May 2022.
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Affiliation(s)
- Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Pranjal Pyne
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Anogh Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
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Ghosh S, Laru S, Hajra A. Ortho C-H Functionalization of 2-Arylimidazo[1,2-a]pyridines. CHEM REC 2021; 22:e202100240. [PMID: 34757691 DOI: 10.1002/tcr.202100240] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 11/09/2022]
Abstract
C-H activation and functionalization is quite promising in recent days as the strategy offers a go-to general method for different bond formations and hence grants synthetic versatility. At the same time, imidazopyridine, a fused bicycle of imidazole moiety with pyridine ring, has a profound impact due to its ubiquitous and prodigious application in medicinal as well as material chemistry. The presence of N-1 atom in 2-arylImidazo[1,2-a]pyridine facilitates the coordination with metal catalysts leading to the formation of ortho-substituted products. This review summarizes all the articles on ortho C-H functionalization of 2-arylImidazo[1,2-a]pyridines published till August 2021.
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Affiliation(s)
- Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Sudip Laru
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
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