1
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Lai D, Bhattacharjee S, Mandal S, Ghosh S, Sahoo P, Sinha S, Hajra A. Iodine(III)-promoted oxidative carbotrifluoromethylation of maleimides with imidazopyridines and Langlois' reagent. Chem Commun (Camb) 2024; 60:2232-2235. [PMID: 38315091 DOI: 10.1039/d3cc05889a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
A metal-free protocol for oxidative carbotrifluoromethylation of maleimides with imidazopyridines and Langlois' reagent has been developed using (diacetoxyiodo)benzene (PIDA) as an oxidant. This three-component strategy enables one-step construction of 3,4-disubstituted maleimides in good yields with high functional group tolerance. Both experimental and theoretical studies support the proposed radical reaction mechanism.
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Affiliation(s)
- Dipti Lai
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
- ISERC, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Suvam Bhattacharjee
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | - Saurodeep Mandal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
- ISERC, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Prithidipa Sahoo
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | - Subrata Sinha
- ISERC, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
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2
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Tali JA, Kumar G, Sharma BK, Rasool Y, Sharma Y, Shankar R. Synthesis and site selective C-H functionalization of imidazo-[1,2- a]pyridines. Org Biomol Chem 2023; 21:7267-7289. [PMID: 37655687 DOI: 10.1039/d3ob00849e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Imidazo[1,2-a]pyridine has attracted much interest in drug development because of its potent medicinal properties, therefore the discovery of novel methods for its synthesis and functionalization continues to be an exciting area of research. Although transition metal catalysis has fuelled the most significant developments, extremely beneficial metal-free approaches have also been identified. Even though pertinent reviews focused on imidazo[1,2-a]pyridine synthesis, properties (physicochemical and medicinal), and functionalization at the C3 position have been published, none of these reviews has focused on the outcomes obtained in the field of global ring functionalization. We wish here to describe a brief synthesis and an overview of all the functionalization reactions at each carbon atom, viz, C2, C3, C5, C6, C7 and C8 of this scaffold, divided into sections based on site-selectivity and the type of functionalization methods used.
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Affiliation(s)
- Javeed Ahmad Tali
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Gulshan Kumar
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Bhupesh Kumar Sharma
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Younis Rasool
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Yashika Sharma
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
| | - Ravi Shankar
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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3
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Hu M, Zhang S, Qin C, Nie H, Xiong Z, Shi X, Zhao Y, Li M, Wang S, Ji F, Jiang G. Selective Electrochemical Halogenation of Functionalized Quinolone. J Org Chem 2023; 88:12958-12970. [PMID: 37620989 DOI: 10.1021/acs.joc.3c00876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
This work describes an effective C3-H halogenation of quinoline-4(1H)-ones under electrochemical conditions, in which potassium halides serve as both halogenating agents and electrolytes. The protocol provides expedient access to different halogenated quinoline-4(1H)-ones with unique regioselectivity, broad substrate scope, and gram-scale synthesis employing convenient, environmentally friendly electrolysis, in an undivided cell. Mechanism studies have shown that halogen radicals can promote the activation of N-H bonds in quinolones.
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Affiliation(s)
- Meiqian Hu
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Shuai Zhang
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Changsheng Qin
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Hongsheng Nie
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Zhicheng Xiong
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Xiaoyu Shi
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Yumiao Zhao
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Mingzhe Li
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Shoucai Wang
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Fanghua Ji
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
| | - Guangbin Jiang
- Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, People's Republic of China
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4
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Tang Z, Hong G, Sun S, Wang L. Electrochemically Enabled Direct C3-Formylation of Imidazopyridines with Me 3 N as a Carbonyl Source. Chem Asian J 2023; 18:e202300001. [PMID: 36772840 DOI: 10.1002/asia.202300001] [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: 01/02/2023] [Revised: 02/09/2023] [Accepted: 02/10/2023] [Indexed: 02/12/2023]
Abstract
A metal-free and oxidant-free electrochemically enabled strategy for C-3 formylation of imidazopyridines using trimethylamine as a one-carbon source has been established. This conversion has high functional group compatibility under mild conditions and ensures late-stage functionalization of pharmaceutical molecules. Furthermore, unexpected hexafluoroisopropoxylation products have been observed in some cases. Mechanistic studies using cyclic voltammetry and control experiments reveal the key intermediate of the formylation process.
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Affiliation(s)
- Zhicong Tang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, P. R. China
| | - Gang Hong
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, P. R. China
| | - Shiyun Sun
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, P. R. China
| | - Limin Wang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, P. R. China
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5
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Gu Q, Cheng Z, Qiu X, Zeng X. Recent Advances in the Electrochemical Functionalization of Isocyanides. CHEM REC 2023; 23:e202200177. [PMID: 36126178 DOI: 10.1002/tcr.202200177] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/30/2022] [Indexed: 01/21/2023]
Abstract
Isocyanides are well-known as efficient CO surrogates and C1 synthons in modern organic synthesis. Although tremendous efforts have been devoted to fully exploiting the reactivity of isocyanides, these transformations are primarily limited by their utilization of stoichiometric toxic chemical oxidants. With the recent resurgence of organic electrochemistry, which has considerably laid dormant over the past several decades, electrolysis has been identified as a green and powerful tool to enrich structural diversity by solely utilizing electric current as clean and inherently safe redox equivalents of stoichiometric chemical oxidants. In this regard, the unique reactivity of isocyanides has been studied in numerous electrochemical transformations. This review comprehensively highlights the most relevant progress in electrochemical strategies towards the functionalization of isocyanides up until June of 2022, with a focus on reaction outcomes and mechanisms.
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Affiliation(s)
- Qingyun Gu
- School of Pharmacy, Nantong University, Nantong, 226001, PR China
| | - Zhenfeng Cheng
- School of Pharmacy, Nantong University, Nantong, 226001, PR China
| | - Xiaodong Qiu
- School of Pharmacy, Nantong University, Nantong, 226001, PR China
| | - Xiaobao Zeng
- School of Pharmacy, Nantong University, Nantong, 226001, PR China
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Ping MQ, Guo MZ, Li RT, Wang ZC, Ma C, Wen LR, Ni SF, Guo W, Li M, Zhang LB. Electrochemically Promoted [3 + 2] Annulation of Imidazo[1,2- a]pyridine with Alkynes. Org Lett 2022; 24:7410-7415. [PMID: 36197136 DOI: 10.1021/acs.orglett.2c02980] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The efficient electrochemically promoted [3 + 2] annulation of imidazo[1,2-a]pyridines with alkynes using traceless electrons as green reagents has been developed, leading to the synthesis of a large class of polycyclic heteroaromatics in good yields with a broad substrate scope under mild and green conditions. The scaled-up experiment, follow-up procedures, and potential biological applications show the practicability and feasibility of the electrochemical method.
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Affiliation(s)
- Meng-Qi Ping
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Ming-Zhong Guo
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Rui-Tao Li
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Zi-Chen Wang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Cheng Ma
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong 515063, China
| | - Li-Rong Wen
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Shao-Fei Ni
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong 515063, China
| | - Weisi Guo
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Ming Li
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
| | - Lin-Bao Zhang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
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Li S, Li X, Wang T, Yang Q, Ouyang Z, Chen J, Zhai H, Li X, Cheng B. Electrochemical Decarboxylative Coupling of N‐Substituted Glycines under Air: Access to C3‐Aminomethylated Imidazo[1,2‐a]pyridines. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | | | - Hongbin Zhai
- Peking University Shenzhen Graduate School CHINA
| | - Xiao Li
- University of Science and Technology Liaoning CHINA
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Li HC, Li GN, Sun K, Chen XL, Jiang MX, Qu LB, Yu B. Ce(III)/Photoassisted Synthesis of Amides from Carboxylic Acids and Isocyanates. Org Lett 2022; 24:2431-2435. [DOI: 10.1021/acs.orglett.2c00699] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Hao-Cong Li
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Guan-Nan Li
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Kai Sun
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Xiao-Lan Chen
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Ming-Xuan Jiang
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Ling-Bo Qu
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Bing Yu
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
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9
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Sakakibara Y, Murakami K, Itami K. C-H Acyloxylation of Polycyclic Aromatic Hydrocarbons. Org Lett 2022; 24:602-607. [PMID: 34994201 DOI: 10.1021/acs.orglett.1c04030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The C-H acyloxylation of polycyclic aromatic hydrocarbons (PAHs) is described. This reaction constructs aryl acyloxylate scaffolds from PAHs with equimolar hypervalent iodine compounds under mild reaction conditions. Interestingly, the blue light irradiation accelerated this transformation. Additionally, the synthesis of structurally new symmetric and unsymmetric diaroyloxylated fluoranthenes was accomplished with a ruthenium photoredox catalyst.
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Affiliation(s)
- Yota Sakakibara
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Kei Murakami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan.,Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuin, Sanda, Hyogo 669-1337, Japan.,JST-PRESTO, 7 Gobancho, Chiyoda, Tokyo 102-0076, Japan
| | - Kenichiro Itami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
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Zhou Z, Luo D, Li G, Yang Z, Cui L, Yang W. Copper-catalyzed three-component reaction to synthesize polysubstituted imidazo[1,2- a]pyridines. RSC Adv 2022; 12:20199-20205. [PMID: 35919587 PMCID: PMC9280286 DOI: 10.1039/d2ra02722d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/07/2022] [Indexed: 12/02/2022] Open
Abstract
An efficient three-component one-pot and operationally simple cascade of 2-aminopyridines with sulfonyl azides and terminal ynones is reported, providing a variety of polysubstituted imidazo[1,2-a]pyridine derivatives in moderate to excellent yields. In particular, the reaction goes a through CuAAC/ring-cleavage process and forms a highly active intermediate α-acyl-N-sulfonyl ketenimine with base free. Three-component one-pot synthesis of polysubstituted imidazo[1,2-a]pyridine derivatives through a base free CuAAC/ring-cleavage process.![]()
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Affiliation(s)
- Zitong Zhou
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Danyang Luo
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Guanrong Li
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Zhongtao Yang
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Liao Cui
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Weiguang Yang
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Zhanjiang, Guangdong, 524023, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, Guangdong, 524023, China
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11
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Ghosh D, Ghosh S, Hajra A. Electrochemical Functionalization of Imidazopyridine and Indazole: An Overview. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100981] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Debashis Ghosh
- Department of Chemistry St. Joseph's College (Autonomous) Bangalore 560027 Karnataka 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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