1
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Liang Q, Gao S, Hao W, Zhang G. Palladium-Catalyzed Multicomponent Carbonylation of Halides to Acylhydrazones. J Org Chem 2024; 89:8537-8545. [PMID: 38861493 DOI: 10.1021/acs.joc.4c00451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
The current methods for synthesizing acylhydrazones are limited by their multistep processes, narrow substrate scope, low selectivities, and poor yields. Herein, a fundamentally novel approach to bioactive acylhydrazones was developed based on the palladium-catalyzed multicomponent tandem condensation carbonylation of halides with aldehydes and hydrazines. This method provides a useful and efficient strategy for generating grams of various acylhydrazones in a one-pot manner. Mechanistic studies provided evidence of facile carbonylation of halides with the weak nucleophile hydrazones facilitated by a base.
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Affiliation(s)
- Qianqian Liang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuo Gao
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wentao Hao
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guoying Zhang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
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2
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Niu M, Yang C, Leng M, Cao Q, Li M, Shen Z. Visible-Light-Driven Decarboxylative Coupling of 2 H-Indazoles with α-Keto Acids without Photocatalysts and Oxidants. J Org Chem 2024; 89:6159-6168. [PMID: 38642058 PMCID: PMC11077484 DOI: 10.1021/acs.joc.4c00176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 04/03/2024] [Accepted: 04/09/2024] [Indexed: 04/22/2024]
Abstract
An efficient synthesis of functionalized 3-acyl-2H-indazoles via visible-light-induced self-catalyzed energy transfer was developed. This method utilized a self-catalyzed energy transfer process between 2H-indazoles and α-keto acids, offering advantages like absence of photosensitizers, metal catalysts, and strong oxidants, broad substrate compatibility, and operational simplicity under mild conditions.
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Affiliation(s)
- Mengyu Niu
- College
of Chemical Engineering, Zhejiang University
of Technology, Hangzhou 310014, China
| | - Chen Yang
- College
of Chemical Engineering, Zhejiang University
of Technology, Hangzhou 310014, China
| | - Mingzhu Leng
- College
of Chemical Engineering, Zhejiang University
of Technology, Hangzhou 310014, China
| | - Qun Cao
- School
of Chemistry, University of Leicester, Leicester LE1 7RH, United Kingdom of Great Britain and Northern
Ireland
| | - Meichao Li
- College
of Chemical Engineering, Zhejiang University
of Technology, Hangzhou 310014, China
| | - Zhenlu Shen
- College
of Chemical Engineering, Zhejiang University
of Technology, Hangzhou 310014, China
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3
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Vlocskó RB, Xie G, Török B. Green Synthesis of Aromatic Nitrogen-Containing Heterocycles by Catalytic and Non-Traditional Activation Methods. Molecules 2023; 28:molecules28104153. [PMID: 37241894 DOI: 10.3390/molecules28104153] [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: 04/04/2023] [Revised: 05/10/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
Recent advances in the environmentally benign synthesis of aromatic N-heterocycles are reviewed, focusing primarily on the application of catalytic methods and non-traditional activation. This account features two main parts: the preparation of single ring N-heterocycles, and their condensed analogs. Both groups include compounds with one, two and more N-atoms. Due to the large number of protocols, this account focuses on providing representative examples to feature the available methods.
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Affiliation(s)
- R Bernadett Vlocskó
- Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Blvd., Boston, MA 02125, USA
| | - Guoshu Xie
- Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Blvd., Boston, MA 02125, USA
| | - Béla Török
- Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Blvd., Boston, MA 02125, USA
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4
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Yang M, Jiang R, Mu Y, Hong Y, Wan Y, Hou J, Tang D. Electrochemical cycloaddition of hydrazones with cyanamide for the synthesis of substituted 5-amine-1,2,4-triazoles. Chem Commun (Camb) 2023; 59:2303-2306. [PMID: 36745484 DOI: 10.1039/d2cc06277a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
An eco-friendly and efficient electrochemical method for the synthesis of 5-amine-1,2,4-triazole derivatives has been developed by employing hydrazones or in situ generation of hydrazones with cyanamide using KI as the catalyst and electrolyte. This strategy could be smoothly conducted with simple reaction conditions at room temperature without the addition of a chemical oxidant in an undivided cell, and cyanamide has been proven to be of great value in electrosynthesis.
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Affiliation(s)
- Minghua Yang
- Department of Chemical and Material Engineering, Quzhou College of Technology, No. 18 Jiangyuan Road, Quzhou 324002, Zhejiang, China
| | - Rui Jiang
- Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and ForestryScience, Yinchuan, P. R. China.
| | - Yangxiu Mu
- Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and ForestryScience, Yinchuan, P. R. China.
| | - Yu Hong
- Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and ForestryScience, Yinchuan, P. R. China.
| | - Yaya Wan
- Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and ForestryScience, Yinchuan, P. R. China.
| | - Jing Hou
- Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and ForestryScience, Yinchuan, P. R. China.
| | - Dong Tang
- Department of Chemical and Material Engineering, Quzhou College of Technology, No. 18 Jiangyuan Road, Quzhou 324002, Zhejiang, China.,Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and ForestryScience, Yinchuan, 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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6
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Alam T, Rakshit A, Dhara HN, Palai A, Patel BK. Electrochemical Amidation: Benzoyl Hydrazine/Carbazate and Amine as Coupling Partners. Org Lett 2022; 24:6619-6624. [PMID: 36069423 DOI: 10.1021/acs.orglett.2c02626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
An electrochemical amidation of benzoyl hydrazine/carbazate and primary/secondary amine as coupling partners via concomitant cleavage and formation of C(sp2)-N bonds has been achieved. This methodology proceeds under metal-free and exogenous oxidant-free conditions producing N2 and H2 as byproducts. Mechanistic studies reveal the in situ generations of both acyl and N-centered radicals from benzoyl hydrazines and amines. The utility of this protocol is demonstrated through a large-scale, and synthesis of bezafibrate, a hyperlipidemic drug.
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Affiliation(s)
- Tipu Alam
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
| | - Amitava Rakshit
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
| | - Hirendra Nath Dhara
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
| | - Angshuman Palai
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
| | - Bhisma K Patel
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
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7
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Oxygen-Doped Carbon Nitride for Enhanced Photocatalytic Activity in Visible-Light-Induced Decarboxylative Annulation Reactions. J Catal 2022. [DOI: 10.1016/j.jcat.2022.09.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Ji XS, Zuo HD, Shen YT, Hao WJ, Tu SJ, Jiang B. Electrochemical selective annulative amino-ketalization and amino-oxygenation of 1,6-enynes. Chem Commun (Camb) 2022; 58:10420-10423. [PMID: 36043317 DOI: 10.1039/d2cc03922b] [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
A new electrochemical selective annulative amino-ketalization and amino-oxygenation of 1,6-enynes with disulfonimides and alcohols is reported, producing a series of functionalized benzofurans under catalyst- and oxidant-free conditions. The annulative aminoketalization proceeds with simple short-chain alcohols such as methanol, ethanol and n-propanol as O-nucleophilic reagents, while the reaction occurs in the annulative aminooxygenation direction in the presence of water and large steric sec-butyl alcohol (SBA).
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Affiliation(s)
- Xiao-Shuang Ji
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Hang-Dong Zuo
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China. .,School of Environmental and Safety Engineering, Changzhou University, Changzhou, 213164, Jiangsu, P. R. China
| | - Yi-Ting Shen
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
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Wang H, Zheng Y, Xu H, Zou J, Jin C. Metal-Free Synthesis of N-Heterocycles via Intramolecular Electrochemical C-H Aminations. Front Chem 2022; 10:950635. [PMID: 35795218 PMCID: PMC9251003 DOI: 10.3389/fchem.2022.950635] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 06/06/2022] [Indexed: 11/13/2022] Open
Abstract
N-heterocycles are key structural units in many drugs, biologically interesting molecules and functional materials. To avoid the residues of metal catalysts, the construction of N-heterocycles under metal-free conditions has attracted much research attention in academia and industry. Among them, the intramolecular electrochemical C-H aminations arguably constitute environmentally friendly methodologies for the metal-free construction of N-heterocycles, mainly due to the direct use of clean electricity as the redox agents. With the recent renaissance of organic electrosynthesis, the intramolecular electrochemical C-H aminations have undergone much progress in recent years. In this article, we would like to summarize the advances in this research field since 2019. The emphasis is placed on the reaction design and mechanistic insight. The challenges and future developments in the intramolecular electrochemical C-H aminations are also discussed.
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Affiliation(s)
- Huiqiao Wang
- School of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, China
- *Correspondence: Huiqiao Wang, ; Congrui Jin,
| | - Yongjun Zheng
- School of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, China
| | - Hucheng Xu
- School of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, China
| | - Jiaru Zou
- School of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, China
| | - Congrui Jin
- Department of Civil and Environmental Engineering, University of Nebraska–Lincoln, Lincoln, NE, United States
- *Correspondence: Huiqiao Wang, ; Congrui Jin,
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