1
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Derat E, Masson G, Claraz A. Electrochemically-Driven 1,4-Aryl Migration via Radical Fluoromethylation of N-Allylbenzamides: a Straightforward Access to Functionalized β-Arylethylamines. Angew Chem Int Ed Engl 2024; 63:e202406017. [PMID: 38687085 DOI: 10.1002/anie.202406017] [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: 03/28/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
An electrochemical radical Truce Smiles rearrangement of N-allylbenzamides is documented herein. The selective 1,4-aryl migration was triggered by the radical fluoromethylation of the alkene providing a direct route to fluoro derivatives of the highly privileged β-arylethylamine pharmacophore. This practical transformation utilizes readily available starting materials and employs an electrical current to drive the oxidative process under mild reaction conditions. It accommodates a variety of migratory aryl groups with different electronic properties and substitution patterns. Careful selection of the protecting group on the nitrogen atom of the N-allylbenzamide is crucial to outcompete the undesired 6-endo cyclization and achieve high level of selectivity towards the 1,4-aryl migration. DFT calculations support the reaction mechanism and unveil the origin of selectivity between the two competitive pathways.
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Affiliation(s)
- Etienne Derat
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, 4 Place Jussieu, CC 229, 75252, Paris Cedex 05, France
| | - Géraldine Masson
- Institut de Chimie des Substances Naturelles (ICSN), CNRS, Université Paris-Saclay, 1 Avenue de la Terrasse, 91198, Gif-sur-Yvette, France
- HitCat, Seqens-CNRS joint laboratory, Seqens'lab, 8 rue de Rouen, 78440, Porcheville, France
| | - Aurélie Claraz
- Institut de Chimie des Substances Naturelles (ICSN), CNRS, Université Paris-Saclay, 1 Avenue de la Terrasse, 91198, Gif-sur-Yvette, France
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2
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Shi Z, Li Y, Li N, Wang WZ, Lu HK, Yan H, Yuan Y, Zhu J, Ye KY. Electrochemical Migratory Cyclization of N-Acylsulfonamides. Angew Chem Int Ed Engl 2022; 61:e202206058. [PMID: 35606293 DOI: 10.1002/anie.202206058] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Indexed: 11/11/2022]
Abstract
Benzoxathiazine dioxide, as a bioisostere of the clinically widely used diazoxide, exhibits interesting biological activity. However, limited success has been achieved in terms of its concise and direct synthesis. We report herein a facile electrochemical migratory cyclization of N-acylsulfonamides to access a diverse array of benzoxathiazine dioxides. The inclusion of electrochemistry is crucial for realizing such a novel transformation, which is substantiated both by the experiments and density-functional-theory calculations.
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Affiliation(s)
- Zhaojiang Shi
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Yuanyuan Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Nan Li
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Wei-Zhen Wang
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Hao-Kuan Lu
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Hong Yan
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Yaofeng Yuan
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Jun Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Ke-Yin Ye
- Institute of Pharmaceutical Science and Technology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
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3
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Shi Z, Li Y, Li N, Wang W, Lu H, Yan H, Yuan Y, Zhu J, Ye K. Electrochemical Migratory Cyclization of
N
‐Acylsulfonamides. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Zhaojiang Shi
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
| | - Yuanyuan Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Department of Chemistry, College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Nan Li
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
| | - Wei‐Zhen Wang
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
| | - Hao‐Kuan Lu
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
| | - Hong Yan
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
| | - Yaofeng Yuan
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
| | - Jun Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Department of Chemistry, College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Ke‐Yin Ye
- Institute of Pharmaceutical Science and Technology College of Chemistry Fuzhou University Fuzhou 350108 China
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4
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Sang D, Dong B, Liu Y, Tian J. Chemoselective Cleavage of Acylsulfonamides and Sulfonamides by Aluminum Halides. J Org Chem 2022; 87:3586-3595. [PMID: 35157468 DOI: 10.1021/acs.joc.1c03133] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The chemoselective cleavage of C-N bonds of amides, sulfonamides, and acylsulfonamides by aluminum halides is described. AlCl3 and AlI3 display complementary reactivities toward N-alkyl and N-acyl moieties. N-Alkylacylsulfonamides, secondary N-(tert-butyl)sulfonamides, and tertiary N-(tert-butyl)amides undergo N-dealkylation upon treatments with AlI3 generated in situ from aluminum and iodine in acetonitrile. In contrast, AlCl3 preferentially cleaves N-acyl groups of tertiary and secondary sulfonamides.
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Affiliation(s)
- Dayong Sang
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China
| | - Bingqian Dong
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China.,School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, Hubei 430205, P. R. China
| | - Yunfeng Liu
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China
| | - Juan Tian
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China
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5
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Abstract
Radical aryl migrations are powerful techniques to forge new bonds in aromatic compounds. The growing popularity of photoredox catalysis has led to an influx of novel strategies to initiate and control aryl migration starting from widely available radical precursors. This review encapsulates progress in radical aryl migration enabled by photochemical methods─particularly photoredox catalysis─since 2015. Special attention is paid to descriptions of scope, mechanism, and synthetic applications of each method.
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Affiliation(s)
- Anthony R. Allen
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Efrey A. Noten
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Corey R. J. Stephenson
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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6
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Chu XQ, Ge D, Cui YY, Shen ZL, Li CJ. Desulfonylation via Radical Process: Recent Developments in Organic Synthesis. Chem Rev 2021; 121:12548-12680. [PMID: 34387465 DOI: 10.1021/acs.chemrev.1c00084] [Citation(s) in RCA: 88] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
As the "chemical chameleon", sulfonyl-containing compounds and their variants have been merged with various types of reactions for the efficient construction of diverse molecular architectures by taking advantage of their incredible reactive flexibility. Currently, their involvement in radical transformations, in which the sulfonyl group typically acts as a leaving group via selective C-S, N-S, O-S, S-S, and Se-S bond cleavage/functionalization, has facilitated new bond formation strategies which are complementary to classical two-electron cross-couplings via organometallic or ionic intermediates. Considering the great influence and synthetic potential of these novel avenues, we summarize recent advances in this rapidly expanding area by discussing the reaction designs, substrate scopes, mechanistic studies, and their limitations, outlining the state-of-the-art processes involved in radical-mediated desulfonylation and related transformations. With a specific emphasis on their synthetic applications, we believe this review will be useful for medicinal and synthetic organic chemists who are interested in radical chemistry and radical-mediated desulfonylation in particular.
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Affiliation(s)
- Xue-Qiang Chu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Danhua Ge
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Yan-Ying Cui
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Zhi-Liang Shen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Chao-Jun Li
- Department of Chemistry and FQRNT Centre for Green Chemistry and Catalysis, McGill University, Montreal, Quebec H3A 0B8, Canada
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8
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Yan J, Cheo HW, Teo WK, Shi X, Wu H, Idres SB, Deng LW, Wu J. A Radical Smiles Rearrangement Promoted by Neutral Eosin Y as a Direct Hydrogen Atom Transfer Photocatalyst. J Am Chem Soc 2020; 142:11357-11362. [DOI: 10.1021/jacs.0c02052] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jianming Yan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Han Wen Cheo
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Wei Kiat Teo
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Xiangcheng Shi
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Hui Wu
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, 8 Medical Drive, Singapore 117597, Singapore
| | - Shabana Binte Idres
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, 8 Medical Drive, Singapore 117597, Singapore
| | - Lih-Wen Deng
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, 8 Medical Drive, Singapore 117597, Singapore
| | - Jie Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- National University of Singapore (Suzhou) Research Institute, No. 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu 215123, China
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9
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Whalley DM, Duong HA, Greaney MF. A visible light-mediated, decarboxylative, desulfonylative Smiles rearrangement for general arylethylamine syntheses. Chem Commun (Camb) 2020; 56:11493-11496. [DOI: 10.1039/d0cc05049k] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A decarboxylative, desulfonylative Smiles rearrangement is reported for the synthesis of a wide range of biologically relevant arylethylamines, including fluorinated phenylethylamines, heterocyclic amphetamines and an unnatural amino acid.
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Affiliation(s)
- David M. Whalley
- Institute of Chemical and Engineering Sciences (ICES) Agency for Science, Technology and Research (A*STAR)
- Singapore
- School of Chemistry
- The University of Manchester
- Manchester M13 9PL
| | - Hung A. Duong
- Institute of Chemical and Engineering Sciences (ICES) Agency for Science, Technology and Research (A*STAR)
- Singapore
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10
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11
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Luo Q, Mao R, Zhu Y, Wang Y. Photoredox-Catalyzed Generation of Sulfamyl Radicals: Sulfonamidation of Enol Silyl Ether with Chlorosulfonamide. J Org Chem 2019; 84:13897-13907. [PMID: 31609610 DOI: 10.1021/acs.joc.9b02062] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel and practical photoredox-catalyzed generation of sulfamyl radicals followed by radical sulfonamidation of enol silyl ether has been described. Diverse functionalized β-ketosulfonamides were prepared in modest to excellent yields under mild and economic reaction conditions through the present catalytic protocol. Furthermore, the methodology developed provides an efficient and convenient approach to the synthesis of the antiseizure drug Zonisamide.
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Affiliation(s)
- Qiyu Luo
- Department of Medicinal Chemistry, School of Pharmacy , Fudan University , 826 Zhangheng Road , Pudong , Shanghai 201203 , China
| | - Runyu Mao
- Department of Medicinal Chemistry, School of Pharmacy , Fudan University , 826 Zhangheng Road , Pudong , Shanghai 201203 , China
| | - Yan Zhu
- Department of Medicinal Chemistry, School of Pharmacy , Fudan University , 826 Zhangheng Road , Pudong , Shanghai 201203 , China
| | - Yonghui Wang
- Department of Medicinal Chemistry, School of Pharmacy , Fudan University , 826 Zhangheng Road , Pudong , Shanghai 201203 , China
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12
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Wang H, Sun S, Cheng J. Copper-Catalyzed Arylsulfonylation and Cyclizative Carbonation of N-(Arylsulfonyl)acrylamides Involving Desulfonative Arrangement toward Sulfonated Oxindoles. Org Lett 2017; 19:5844-5847. [DOI: 10.1021/acs.orglett.7b02827] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hepan Wang
- School of Petrochemical Engineering, and Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China
| | - Song Sun
- School of Petrochemical Engineering, and Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China
| | - Jiang Cheng
- School of Petrochemical Engineering, and Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China
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13
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Guo C, Chen D, Chen S, Liu X. Synthesis of Tetrasubstituted α,β‐Unsaturated Aldehydes
via
Radical 1,4‐Aryl Migration/Trifluoromethylthiolation Cascade Reaction of Aryl Propynyl Ethers. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700534] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Chun‐Huan Guo
- State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 People's Republic of China
| | - Dao‐Qian Chen
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 People's Republic of China
| | - Si Chen
- State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 People's Republic of China
| | - Xue‐Yuan Liu
- State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 People's Republic of China
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14
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Brachet E, Marzo L, Selkti M, König B, Belmont P. Visible light amination/Smiles cascade: access to phthalazine derivatives. Chem Sci 2016; 7:5002-5006. [PMID: 30155150 PMCID: PMC6018559 DOI: 10.1039/c6sc01095d] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/06/2016] [Indexed: 01/02/2023] Open
Abstract
We report the synthesis of various phthalazines via a new cascade reaction, initiated by visible light photocatalysis, involving a radical hydroamination reaction followed by a radical Smiles rearrangement. Phthalazine derivatives are obtained in high yields and from a broad scope readily accessible ortho-alkynylsulfonohydrazone precursors. The mild photoredox conditions ensure an excellent functional group tolerance. Application of this strategy to a one-pot protocol starting from the corresponding carbonyl compounds, and subsequent functionalization allow the rapid synthesis of structurally diverse structures.
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Affiliation(s)
- Etienne Brachet
- Université Sorbonne Paris Cité (USPC) , Université Paris Descartes , Faculté de Pharmacie de Paris , UMR CNRS 8638 (COMETE) , 4 avenue de l'Observatoire , 75006 Paris , France . ;
| | - Leyre Marzo
- University of Regensburg Faculty of Chemistry and Pharmacy , Institute of Organic Chemistry , Universitätsstraße 31 , 93053 Regensburg , Germany
| | - Mohamed Selkti
- Université Sorbonne Paris Cité (USPC) , Université Paris Descartes , Faculté de Pharmacie de Paris , UMR CNRS 8015 (LCRB) , 4 avenue de l'Observatoire , 75006 Paris , France
| | - Burkhard König
- University of Regensburg Faculty of Chemistry and Pharmacy , Institute of Organic Chemistry , Universitätsstraße 31 , 93053 Regensburg , Germany
| | - Philippe Belmont
- Université Sorbonne Paris Cité (USPC) , Université Paris Descartes , Faculté de Pharmacie de Paris , UMR CNRS 8638 (COMETE) , 4 avenue de l'Observatoire , 75006 Paris , France . ;
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15
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Li Y, Hu B, Dong W, Xie X, Wan J, Zhang Z. Visible Light-Induced Radical Rearrangement to Construct C–C Bonds via an Intramolecular Aryl Migration/Desulfonylation Process. J Org Chem 2016; 81:7036-41. [DOI: 10.1021/acs.joc.6b00735] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuyuan Li
- Key Laboratory of Sensor Analysis of Tumor
Marker, Ministry of Education, College of Chemistry and Molecular
Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Bei Hu
- School of Chemistry
and Chemical Engineering, Shanghai Jiao Tong University, 800
Dongchuan Road, Shanghai, 200240, China
| | - Wuheng Dong
- School of Chemistry
and Chemical Engineering, Shanghai Jiao Tong University, 800
Dongchuan Road, Shanghai, 200240, China
| | - Xiaomin Xie
- School of Chemistry
and Chemical Engineering, Shanghai Jiao Tong University, 800
Dongchuan Road, Shanghai, 200240, China
| | - Jun Wan
- Key Laboratory of Sensor Analysis of Tumor
Marker, Ministry of Education, College of Chemistry and Molecular
Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhaoguo Zhang
- School of Chemistry
and Chemical Engineering, Shanghai Jiao Tong University, 800
Dongchuan Road, Shanghai, 200240, China
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16
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Wyler B, Brucelle F, Renaud P. Preparation of the Core Structure of Aspidosperma and Strychnos Alkaloids from Aryl Azides by a Cascade Radical Cyclization. Org Lett 2016; 18:1370-3. [DOI: 10.1021/acs.orglett.6b00306] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Benjamin Wyler
- Universität Bern, Departement für Chemie und Biochemie, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - François Brucelle
- Universität Bern, Departement für Chemie und Biochemie, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Philippe Renaud
- Universität Bern, Departement für Chemie und Biochemie, Freiestrasse 3, CH-3012 Bern, Switzerland
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17
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Zard SZ. The xanthate route to organofluorine derivatives. A brief account. Org Biomol Chem 2016; 14:6891-912. [DOI: 10.1039/c6ob01087c] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The radical chemistry of xanthates allows numerous approaches to organofluorine compounds.
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Affiliation(s)
- Samir Z. Zard
- Laboratoire de Synthèse Organique UMR 7652
- Ecole Polytechnique
- 91128 Palaiseau
- France
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18
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Kong DL, Cheng L, Wu HR, Li YX, Wang D, Liu L. A metal-free yne-addition/1,4-aryl migration/decarboxylation cascade reaction of alkynoates with Csp3–H centers. Org Biomol Chem 2016; 14:2210-7. [DOI: 10.1039/c5ob02478a] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of alkynoates with different types of radical precursors under metal-free conditions affording single-site-addition poly-substituted alkenes were reported.
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Affiliation(s)
- De-Long Kong
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Liang Cheng
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Hong-Ru Wu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Yang-Xiong Li
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Dong Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Li Liu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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19
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Ujjainwalla F, da Mata MLE, Pennell AM, Escolano C, Motherwell WB, Vázquez S. Synthesis of biaryls via intramolecular free radical ipso-substitution reactions. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.07.048] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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20
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Zheng G, Li Y, Han J, Xiong T, Zhang Q. Radical cascade reaction of alkynes with N-fluoroarylsulfonimides and alcohols. Nat Commun 2015; 6:7011. [PMID: 25901840 PMCID: PMC4421815 DOI: 10.1038/ncomms8011] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 03/20/2015] [Indexed: 12/13/2022] Open
Abstract
Cascade reactions initiated by radical addition to alkynes are synthetically very attractive because they enable access to highly complex molecular skeletons in only few synthetic steps under usually mild conditions. Here we report a general radical cascade reaction of alkynes, N-fluoroarylsulfonimides and alcohols, enabling the efficient synthesis of important α-amino-α-aryl ketones from readily available starting materials via a single operation. During this process, the highly regioselective nitrogen-centred radical addition to internal and terminal alkynes generating vinyl radicals and the next explicit migration of aryl group from the nitrogen source lead the following efficient desulfonylation, oxygenation, and semi-pinacol rearrangement. In addition, the semi-pinacol rearrangement precursors, α-alkyloxyl-α,α-diaryl imines, could also be efficiently obtained under milder conditions. This methodology might open a new entry for designing intermolecular radical cascade reaction of alkynes.
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Affiliation(s)
- Guangfan Zheng
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yan Li
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Jingjie Han
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Tao Xiong
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qian Zhang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
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21
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Qin L, Zard SZ. Radical-based route to 2-(trifluoromethyl)-1,3,4-oxadiazoles and trifluoromethyl-substituted polycyclic 1,2,4-triazoles and dihydrofurans. Org Lett 2015; 17:1577-80. [PMID: 25732871 DOI: 10.1021/acs.orglett.5b00457] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
O-Ethyl S-[5-(trifluoromethyl)-1,3,4-oxadiazol-2-yl]methyl xanthate was readily prepared on a large scale and shown to undergo very efficient intermolecular radical additions to unactivated alkenes. The products were further elaborated by exploiting both radical and ionic processes to provide a variety of trifluoromethyl-substituted derivatives, including medicinally relevant triazoles. In particular, the application of a radical allylation on the initial adducts leads to structures that are able to undergo intramolecular [4 + 2] cycloaddition reactions.
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Affiliation(s)
- Ling Qin
- Laboratoire de SynthèseOrganique, UMR 7652 CNRS/EcolePolytechnique Palaiseau 91128 Cedex, France
| | - Samir Z Zard
- Laboratoire de SynthèseOrganique, UMR 7652 CNRS/EcolePolytechnique Palaiseau 91128 Cedex, France
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22
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Kong W, Fuentes N, García-Domínguez A, Merino E, Nevado C. Stereoselective Synthesis of Highly Functionalized Indanes and Dibenzocycloheptadienes through Complex Radical Cascade Reactions. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201409659] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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23
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Kong W, Fuentes N, García-Domínguez A, Merino E, Nevado C. Stereoselective synthesis of highly functionalized indanes and dibenzocycloheptadienes through complex radical cascade reactions. Angew Chem Int Ed Engl 2015; 54:2487-91. [PMID: 25597296 DOI: 10.1002/anie.201409659] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 11/22/2014] [Indexed: 12/23/2022]
Abstract
Two highly stereoselective radical-mediated syntheses of densely functionalized indanes and dibenzocycloheptadienes from ortho-vinyl- and ortho-vinylaryl-substituted N-(arylsulfonyl)-acrylamides, respectively, are presented here. The chemoselective addition of in situ generated radicals (X(·)) onto the styrene moieties triggers an unprecedented reaction cascade, resulting in the formation of one new C-X bond and two new C-C bonds, a formal 1,4-aryl migration, and the extrusion of SO2 to generate an amidyl radical intermediate. This intermediate, upon H abstraction, leads to the observed 5- and 7-membered ring carbocyclic products, respectively, in a highly efficient manner.
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Affiliation(s)
- Wangqing Kong
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich (Switzerland)
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24
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Fuentes N, Kong W, Fernández-Sánchez L, Merino E, Nevado C. Cyclization Cascades via N-Amidyl Radicals toward Highly Functionalized Heterocyclic Scaffolds. J Am Chem Soc 2015; 137:964-73. [DOI: 10.1021/ja5115858] [Citation(s) in RCA: 315] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Noelia Fuentes
- Department of Chemistry, University of Zürich, Winterthurerstrasse
190, 8057 Zürich, Switzerland
| | - Wangqing Kong
- Department of Chemistry, University of Zürich, Winterthurerstrasse
190, 8057 Zürich, Switzerland
| | - Luis Fernández-Sánchez
- Department of Chemistry, University of Zürich, Winterthurerstrasse
190, 8057 Zürich, Switzerland
| | - Estíbaliz Merino
- Department of Chemistry, University of Zürich, Winterthurerstrasse
190, 8057 Zürich, Switzerland
| | - Cristina Nevado
- Department of Chemistry, University of Zürich, Winterthurerstrasse
190, 8057 Zürich, Switzerland
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25
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Chen ZM, Zhang XM, Tu YQ. Radical aryl migration reactions and synthetic applications. Chem Soc Rev 2015; 44:5220-45. [DOI: 10.1039/c4cs00467a] [Citation(s) in RCA: 230] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review provides a comprehensive summary of radical aryl migration reactions, highlighting their mechanistic studies and synthetic applications.
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Affiliation(s)
- Zhi-Min Chen
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry
- Lanzhou University
- Collaborative Innovation Center of Chemical Science and Engineering
- Lanzhou
- Tianjin
| | - Yong-Qiang Tu
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
- State Key Laboratory of Applied Organic Chemistry
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26
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Wang C, Xie X, Liu J, Liu Y, Li Y. Gold(I)-Catalyzed 1,4- and/or 1,5-Heteroaryl Migration Reactions through Regiocontrolled Cyclizations. Chemistry 2014; 21:559-64. [DOI: 10.1002/chem.201405190] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Indexed: 11/10/2022]
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27
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Ananikov VP, Khemchyan LL, Ivanova YV, Bukhtiyarov VI, Sorokin AM, Prosvirin IP, Vatsadze SZ, Medved'ko AV, Nuriev VN, Dilman AD, Levin VV, Koptyug IV, Kovtunov KV, Zhivonitko VV, Likholobov VA, Romanenko AV, Simonov PA, Nenajdenko VG, Shmatova OI, Muzalevskiy VM, Nechaev MS, Asachenko AF, Morozov OS, Dzhevakov PB, Osipov SN, Vorobyeva DV, Topchiy MA, Zotova MA, Ponomarenko SA, Borshchev OV, Luponosov YN, Rempel AA, Valeeva AA, Stakheev AY, Turova OV, Mashkovsky IS, Sysolyatin SV, Malykhin VV, Bukhtiyarova GA, Terent'ev AO, Krylov IB. Development of new methods in modern selective organic synthesis: preparation of functionalized molecules with atomic precision. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v83n10abeh004471] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Gao P, Shen YW, Fang R, Hao XH, Qiu ZH, Yang F, Yan XB, Wang Q, Gong XJ, Liu XY, Liang YM. Copper-catalyzed one-pot trifluoromethylation/aryl migration/carbonyl formation with homopropargylic alcohols. Angew Chem Int Ed Engl 2014; 53:7629-33. [PMID: 24938432 DOI: 10.1002/anie.201403383] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 04/08/2014] [Indexed: 11/10/2022]
Abstract
A novel copper-catalyzed one-pot functionalization of homopropargylic alcohols that involves trifluoromethylation, aryl migration, and formation of a carbonyl moiety has been developed. This reaction constitutes the first direct conversion of homopropargylic alcohols into CF3-containing 3-butenal or 3-buten-1-one derivatives in a regioselective manner. Mechanistic studies indicate that the 1,4-aryl migration proceeds through a radical pathway.
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Affiliation(s)
- Pin Gao
- State key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000 (China)
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29
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Gao P, Shen YW, Fang R, Hao XH, Qiu ZH, Yang F, Yan XB, Wang Q, Gong XJ, Liu XY, Liang YM. Copper-Catalyzed One-Pot Trifluoromethylation/Aryl Migration/Carbonyl Formation with Homopropargylic Alcohols. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403383] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Kong W, Merino E, Nevado C. Arylphosphonylation and Arylazidation of Activated Alkenes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201311241] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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31
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Kong W, Merino E, Nevado C. Arylphosphonylation and Arylazidation of Activated Alkenes. Angew Chem Int Ed Engl 2014; 53:5078-82. [DOI: 10.1002/anie.201311241] [Citation(s) in RCA: 200] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 03/03/2014] [Indexed: 01/16/2023]
Affiliation(s)
- Wangqing Kong
- Department of Chemistry, Universität Zürich (Switzerland)
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32
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Goh KKK, Kim S, Zard SZ. A Synthesis of (1E,3E)-TMS Dienes from Keto-Xanthates via Chugaev-Type Elimination. J Org Chem 2013; 78:12274-9. [DOI: 10.1021/jo402169v] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kelvin Kau Kiat Goh
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, Singapore 637371, Singapore
- Laboratoire
de Synthèse Organique, CNRS UMR 765, Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Sunggak Kim
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Samir Z. Zard
- Laboratoire
de Synthèse Organique, CNRS UMR 765, Ecole Polytechnique, 91128 Palaiseau Cedex, France
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33
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Kong W, Casimiro M, Merino E, Nevado C. Copper-Catalyzed One-Pot Trifluoromethylation/Aryl Migration/Desulfonylation and C(sp2)–N Bond Formation of Conjugated Tosyl Amides. J Am Chem Soc 2013; 135:14480-3. [DOI: 10.1021/ja403954g] [Citation(s) in RCA: 349] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Wangqing Kong
- Organic
Chemistry Institute, Universität Zürich, Zürich,
Switzerland
| | - Maria Casimiro
- Organic
Chemistry Institute, Universität Zürich, Zürich,
Switzerland
| | - Estı́baliz Merino
- Organic
Chemistry Institute, Universität Zürich, Zürich,
Switzerland
| | - Cristina Nevado
- Organic
Chemistry Institute, Universität Zürich, Zürich,
Switzerland
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34
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35
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Charrier N, Liu Z, Zard SZ. Desulfonylative Radical Ring Closure onto Aromatics. A Modular Route to Benzazepin-2-ones and 5-Arylpiperidin-2-ones. Org Lett 2012; 14:2018-21. [DOI: 10.1021/ol3005276] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicolas Charrier
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Zhibo Liu
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Samir Z. Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
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36
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El Qacemi M, Petit L, Quiclet-Sire B, Zard SZ. A unified access to diverse heteroaromatic scaffolds using the radical chemistry of xanthates. Org Biomol Chem 2012; 10:5707-19. [DOI: 10.1039/c2ob25169h] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Pudlo M, Allart-Simon I, Tinant B, Gérard S, Sapi J. First domino radical cyclisation/Smiles rearrangement combination. Chem Commun (Camb) 2012; 48:2442-4. [DOI: 10.1039/c2cc15670a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Ragoussi ME, Walker SM, Piccanello A, Kariuki BM, Horton PN, Spencer N, Snaith JS. Stereoselective Synthesis of 2,4,5-Trisubstituted Piperidines via Radical Cyclization. J Org Chem 2010; 75:7347-57. [DOI: 10.1021/jo101631y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maria-Eleni Ragoussi
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Stephen M. Walker
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Andrea Piccanello
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Benson M. Kariuki
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Peter N. Horton
- EPSRC National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
| | - Neil Spencer
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - John S. Snaith
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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39
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Wu L, Shi M, Li Y. BF3⋅OEt2-Catalyzed Intermolecular Reactions of Vinylidenecyclopropanes with Bis(p-alkoxyphenyl)methanols: A Novel Cationic 1,4-Aryl-Migration Process. Chemistry 2010; 16:5163-72. [DOI: 10.1002/chem.200903131] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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2-Aryl propionamides via 1,4-aryl radical migration from N-arylsulfonyl-2-bromopropionamides. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.08.125] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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41
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Clark AJ, Coles SR, Collis A, Debure T, Guy C, Murphy NP, Wilson P. 1,4-Aryl migration under copper(I) atom transfer conditions. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.07.089] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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42
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Regioselective synthesis of 3-heteroarylpiperidin-2-ones and diazacyclopenta[a]phenalenone via carbenoid reactions. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.070] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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Radical 1,4-aryl transfer in arylcarboxamides leading to phthalimides, biaryls and enantiomerically enriched β-arylethylamines. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.07.118] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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44
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Affiliation(s)
- Béatrice Quiclet-Sire
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Samir Z. Zard
- Laboratoire de Synthèse Organique, CNRS UMR 7652 Ecole Polytechnique, 91128 Palaiseau Cedex, France
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45
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Synthesis of substituted 3-arylpiperidines and 3-arylpyrrolidines by radical 1,4 and 1,2-aryl migrations. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.04.091] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Wilkinson JA, Ardes-Guisot N, Ducki S, Leonard J. Novel methods for the synthesis of 5-substituted-3-carboxy-2,5- and 4,5-dihydrothiophenes and 5-substituted 2- and 3-sulfolenes. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.11.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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47
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Zard SZ. New routes to organofluorine compounds based on ketenes and the radical transfer of xanthates. Org Biomol Chem 2007; 5:205-13. [PMID: 17205160 DOI: 10.1039/b615592h] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New routes to organofluorine derivatives based mostly on the powerful xanthate radical transfer technology are described. A special emphasis is placed on the synthesis of trifluoromethyl-substituted structures, including trifluromethyl ketones and fluorinated aromatic and heteroaromatic substances of interest to the pharmaceutical and agrochemical industries.
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Affiliation(s)
- Samir Z Zard
- Laboratoire de Synthèse Organique, Département de Chimie, Ecole Polytechnique, 91128 Palaiseau, France.
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48
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Gandon LA, Russell AG, Güveli T, Brodwolf AE, Kariuki BM, Spencer N, Snaith JS. Synthesis of 2,4-Disubstituted Piperidines via Radical Cyclization: Unexpected Enhancement in Diastereoselectivity with Tris(trimethylsilyl)silane. J Org Chem 2006; 71:5198-207. [PMID: 16808507 DOI: 10.1021/jo060495w] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel approach to 2,4-disubstituted piperidines is reported, involving the radical cyclization of 7-substituted-6-aza-8-bromooct-2-enoates. Cyclization with tributyltin hydride affords the trans piperidines with trans/cis diastereomeric ratios ranging typically from 3:1 to 6:1. Cyclization with tris(trimethylsilyl)silane affords the same products with diastereomeric ratios of up to 99:1 in certain cases. The enhancement in diastereoselectivity results from the selective rearrangement of the minor stereoisomer through a cascade process involving radical cyclization to the piperidine radical, 1,5-radical translocation, and attack of the translocated radical onto the sulfonamide with extrusion of SO2 in a Smiles-type rearrangement. Slower trapping of the piperidine radical by tris(trimethylsilyl)silane compared to tributyltin hydride accounts for the occurrence of the rearrangement cascade in the former case.
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Affiliation(s)
- Lucile A Gandon
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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49
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Harakat D, Pesch J, Marinković S, Hoffmann N. Thiocarbonyl compounds as regulating reagent in the radical addition of tertiary amines with alkenes using photoelectron transfer conditions. Org Biomol Chem 2006; 4:1202-5. [PMID: 16557304 DOI: 10.1039/b600220j] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficiency of the photoinduced radical addition of tertiary amines to olefinic double bonds is significantly enhanced and the stereoselectivity is influenced when thiocarbonyl compounds are added to the reaction mixture.
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Affiliation(s)
- Dominique Harakat
- Laboratoire des Réactions Sélectives et Applications, UMR CNRS et Université de Reims Champagne-Ardenne, UFR Sciences, B.P. 1039, F-51687 Reims, cedex 02, France
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50
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Z. Zard S, Vila X. Synthesis of Substituted 4-Arylpiperidin-2-ones by a 6-exo-Trig Radical Cyclization. HETEROCYCLES 2006. [DOI: 10.3987/com-06-s(w)7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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