1
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Abstract
Herein, we report a mild, rapid, straightforward method for visible-light-mediated sulfonamide ethylation to afford a diverse array of compounds with C(sp3)-sulfonamide skeletons. The method relies on inexpensive, abundant, commercially available primary, secondary, and tertiary alkyl carboxylic acids and alkyl iodides as substrates. The method has a broad substrate scope and potential utility for late-stage functionalization of natural products and synthetic medicines and can be expected to facilitate rapid structural diversification of bioactive molecules.
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Affiliation(s)
- Mingjun Zhang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Mo Yu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Ziwen Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
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2
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Juliá F, Constantin T, Leonori D. Applications of Halogen-Atom Transfer (XAT) for the Generation of Carbon Radicals in Synthetic Photochemistry and Photocatalysis. Chem Rev 2021; 122:2292-2352. [PMID: 34882396 DOI: 10.1021/acs.chemrev.1c00558] [Citation(s) in RCA: 162] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The halogen-atom transfer (XAT) is one of the most important and applied processes for the generation of carbon radicals in synthetic chemistry. In this review, we summarize and highlight the most important aspects associated with XAT and the impact it has had on photochemistry and photocatalysis. The organization of the material starts with the analysis of the most important mechanistic aspects and then follows a subdivision based on the nature of the reagents used in the halogen abstraction. This review aims to provide a general overview of the fundamental concepts and main agents involved in XAT processes with the objective of offering a tool to understand and facilitate the development of new synthetic radical strategies.
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Affiliation(s)
- Fabio Juliá
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Timothée Constantin
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Daniele Leonori
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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3
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Li M, Banerjee K, Friestad GK. Diastereocontrol in Radical Addition to β-Benzyloxy Hydrazones: Revised Approach to Tubuvaline and Synthesis of O-Benzyltubulysin V Benzyl Ester. J Org Chem 2021; 86:15139-15152. [PMID: 34636574 PMCID: PMC8576829 DOI: 10.1021/acs.joc.1c01798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Indexed: 11/29/2022]
Abstract
Radical addition to chiral N-acylhydrazones has generated unusual amino acids tubuphenylalanine (Tup) and tubuvaline (Tuv) that are structural components of the tubulysin family of picomolar antimitotic agents and previously led to a tubulysin tetrapeptide analog with a C-terminal alcohol. To improve efficiency in this synthetic route to tubulysins, and to address difficulties in oxidation of the C-terminal alcohol, here we present two alternative routes to Tuv that (a) improve step economy, (b) provide modified conditions for Mn-mediated radical addition in the presence of aromatic heterocycles, and (c) expose an example of double diastereocontrol in radical addition to a β-benzyloxyhydrazone with broader implications for asymmetric amine synthesis via radical addition. An efficient coupling sequence affords 11-O-benzyltubulysin V benzyl ester.
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Affiliation(s)
- Manshu Li
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Koushik Banerjee
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Gregory K. Friestad
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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4
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Firth JD, Hammarback LA, Burden TJ, Eastwood JB, Donald JR, Horbaczewskyj CS, McRobie MT, Tramaseur A, Clark IP, Towrie M, Robinson A, Krieger JP, Lynam JM, Fairlamb IJS. Light- and Manganese-Initiated Borylation of Aryl Diazonium Salts: Mechanistic Insight on the Ultrafast Time-Scale Revealed by Time-Resolved Spectroscopic Analysis. Chemistry 2021; 27:3979-3985. [PMID: 33135818 DOI: 10.1002/chem.202004568] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Indexed: 11/12/2022]
Abstract
Manganese-mediated borylation of aryl/heteroaryl diazonium salts emerges as a general and versatile synthetic methodology for the synthesis of the corresponding boronate esters. The reaction proved an ideal testing ground for delineating the Mn species responsible for the photochemical reaction processes, that is, involving either Mn radical or Mn cationic species, which is dependent on the presence of a suitably strong oxidant. Our findings are important for a plethora of processes employing Mn-containing carbonyl species as initiators and/or catalysts, which have considerable potential in synthetic applications.
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Affiliation(s)
- James D Firth
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | | | - Thomas J Burden
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | | | - James R Donald
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | | | - Matthew T McRobie
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Adam Tramaseur
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Ian P Clark
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, OX11 0QX, UK
| | - Michael Towrie
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, OX11 0QX, UK
| | - Alan Robinson
- Syngenta Crop Protection AG, Breitenloh 5, 4333, Münchwilen, Switzerland
| | | | - Jason M Lynam
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Ian J S Fairlamb
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
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5
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Zhang X, Fang W, Lekkala R, Tang W, Qin H. An Easy, General and Practical Method for the Construction of Alkyl Sulfonyl Fluorides. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000515] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Xu Zhang
- State Key Laboratory of Silicate Materials for Architecturesand School of ChemistryChemical Engineering and Life ScienceWuhan University of Technology 205 Luoshi Road Wuhan 430070 People's Republic of China
| | - Wan‐Yin Fang
- State Key Laboratory of Silicate Materials for Architecturesand School of ChemistryChemical Engineering and Life ScienceWuhan University of Technology 205 Luoshi Road Wuhan 430070 People's Republic of China
| | - Ravindar Lekkala
- State Key Laboratory of Silicate Materials for Architecturesand School of ChemistryChemical Engineering and Life ScienceWuhan University of Technology 205 Luoshi Road Wuhan 430070 People's Republic of China
| | - Wenjian Tang
- School of PharmacyAnhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical University Hefei 230032 People's Republic of China
| | - Hua‐Li Qin
- State Key Laboratory of Silicate Materials for Architecturesand School of ChemistryChemical Engineering and Life ScienceWuhan University of Technology 205 Luoshi Road Wuhan 430070 People's Republic of China
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6
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7
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Wang X, Dong J, Li Y, Liu Y, Wang Q. Visible-Light-Mediated Manganese-Catalyzed Allylation Reactions of Unactivated Alkyl Iodides. J Org Chem 2020; 85:7459-7467. [PMID: 32383380 DOI: 10.1021/acs.joc.0c00861] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Herein, we report a protocol for visible-light-mediated allylation reactions between unactivated alkyl iodides and allyl sulfones under mild conditions with catalysis by inexpensive and readily available Mn2(CO)10. This protocol is compatible with a wide array of sensitive functional groups and has a broad substrate scope with regard to both alkyl iodides and allyl sulfones.
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Affiliation(s)
- Xiaochen Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Jianyang Dong
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Yongqiang Li
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People's Republic of China
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8
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Liu R, Li J, Sun J, Liu X, Qu S, Li P, Zhang B. Generation and Reactivity of Amidyl Radicals: Manganese‐Mediated Atom‐Transfer Reaction. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913042] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Run‐Zhou Liu
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University 24 Tongjia Xiang Nanjing 210009 China
| | - Jinxia Li
- College of Chemistry and Chemical EngineeringHunan University Changsha 410082 China
| | - Jun Sun
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University 24 Tongjia Xiang Nanjing 210009 China
| | - Xian‐Guan Liu
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University 24 Tongjia Xiang Nanjing 210009 China
| | - Shuanglin Qu
- College of Chemistry and Chemical EngineeringHunan University Changsha 410082 China
| | - Ping Li
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University 24 Tongjia Xiang Nanjing 210009 China
| | - Bo Zhang
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University 24 Tongjia Xiang Nanjing 210009 China
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9
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Ji Y, Wang L, Guo W, Bi Q, Zhang B. Intermolecular Iodofluoroalkylation of Unactivated Alkynes and Alkenes Mediated by Manganese Catalysts. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901556] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Yun‐Xing Ji
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University Nanjing 210009 People's Republic of China
| | - Lu‐Jun Wang
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University Nanjing 210009 People's Republic of China
| | - Wei‐Si Guo
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular EngineeringQingdao University of Science & Technology Qingdao 266042 People's Republic of China
| | - Qirui Bi
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University Nanjing 210009 People's Republic of China
| | - Bo Zhang
- State Key Laboratory of Natural MedicinesChina Pharmaceutical University Nanjing 210009 People's Republic of China
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10
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Liu RZ, Li J, Sun J, Liu XG, Qu S, Li P, Zhang B. Generation and Reactivity of Amidyl Radicals: Manganese-Mediated Atom-Transfer Reaction. Angew Chem Int Ed Engl 2020; 59:4428-4433. [PMID: 31912602 DOI: 10.1002/anie.201913042] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 12/09/2019] [Indexed: 12/15/2022]
Abstract
A simple and efficient protocol to generate amidyl radicals from amine functionalities through a manganese-mediated atom-transfer reaction has been developed. This approach employs an earth-abundant and inexpensive manganese complex, Mn2 (CO)10 , as the catalyst and visible light as the energy input. Using this strategy, site-selective chlorination of unactivated C(sp3 )-H bonds of aliphatic amines and intramolecular/intermolecular chloroaminations of unactivated alkenes were readily realized under mild reaction conditions, thus providing efficient access to a range of synthetically valuable alkyl chlorides, chlorinated pyrrolidines, and vicinal chloroamine derivatives. These practical reactions exhibit a broad substrate scope and tolerate a wide array of functional groups, and complex molecules including various marketed drug derivatives.
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Affiliation(s)
- Run-Zhou Liu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing, 210009, China
| | - Jinxia Li
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Jun Sun
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing, 210009, China
| | - Xian-Guan Liu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing, 210009, China
| | - Shuanglin Qu
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Ping Li
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing, 210009, China
| | - Bo Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing, 210009, China
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11
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Long W, Lian P, Li J, Wan X. Mn-Catalysed photoredox hydroxytrifluoromethylation of aliphatic alkenes using CF3SO2Na. Org Biomol Chem 2020; 18:6483-6486. [DOI: 10.1039/d0ob01322f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mn(acac)3 catalyzed photoinduced hydroxytrifluoromethylation of aliphatic alkenes with CF3SO2Na was well established.
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Affiliation(s)
- Wenhao Long
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Pengcheng Lian
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Jingjing Li
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Xiaobing Wan
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
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12
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Zhang J, Ke Q, Chen J, Yu J, Yan G. Trifluoroacetylation of Anilines with Ethyl Trifluoropyruvate Mediated by Copper(I) Chloride. LETT ORG CHEM 2019. [DOI: 10.2174/1570178616666190311162001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A novel copper(I)-mediated trifluoroacetylation of anilines with ethyl trifluoropyruvate as a
trifluoroacetylating reagent has been developed. Although this protocol could provide good yields in
most cases, the reaction exhibited the obvious electronic and steric effects of substituents. The trace
amount of products was only obtained for the substrates with ortho-substituted or electron-deficient
groups.
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Affiliation(s)
- Jieyu Zhang
- Department of Chemistry, Lishui University, Lishui 323000, China
| | - Qiumin Ke
- Department of Chemistry, Lishui University, Lishui 323000, China
| | - Jiaying Chen
- Department of Chemistry, Lishui University, Lishui 323000, China
| | - Jian Yu
- Department of Chemistry, Lishui University, Lishui 323000, China
| | - Guobing Yan
- Department of Chemistry, Lishui University, Lishui 323000, China
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13
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Zheng D, Studer A. Asymmetric Synthesis of Heterocyclic γ-Amino-Acid and Diamine Derivatives by Three-Component Radical Cascade Reactions. Angew Chem Int Ed Engl 2019; 58:15803-15807. [PMID: 31489747 DOI: 10.1002/anie.201908987] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Indexed: 01/01/2023]
Abstract
An enantioselective three-component radical reaction of quinolines or pyridines with enamides and α-bromo carbonyl compounds by dual photoredox and chiral Brønsted acid catalysis is presented. A range of valuable chiral γ-amino-acid derivatives are accessible in high chemo-, regio-, and enantioselectivity from simple, readily available starting materials under mild reaction conditions. Using the same strategy, the asymmetric synthesis of 1,2-diamine derivatives is also reported.
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Affiliation(s)
- Danqing Zheng
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149, Münster, Germany
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14
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Zheng D, Studer A. Asymmetric Synthesis of Heterocyclic γ‐Amino‐Acid and Diamine Derivatives by Three‐Component Radical Cascade Reactions. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908987] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Danqing Zheng
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Armido Studer
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
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15
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Weng WZ, Liang H, Liu RZ, Ji YX, Zhang B. Visible-Light-Promoted Manganese-Catalyzed Atom Transfer Radical Cyclization of Unactivated Alkyl Iodides. Org Lett 2019; 21:5586-5590. [PMID: 31241973 DOI: 10.1021/acs.orglett.9b01918] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
An expedient visible-light-promoted atom transfer radical cyclization (ATRC) reaction of unactivated alkyl iodides facilitated by earth-abundant and inexpensive manganese catalysis is described. The practical protocol shows a broad substrate scope and good functional-group tolerance, allowing for the preparation of synthetically valuable alkenyl iodides and diquinanes under simple and mild reaction conditions. Notably, the method provides a net redox-neutral strategy for ATRC reactions that avoids classic hydrogen atom transfer mechanism.
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Affiliation(s)
- Wei-Zhi Weng
- State Key Laboratory of Natural Medicines , China Pharmaceutical University , 24 Tongjia Xiang , Nanjing 210009 , China
| | - Hao Liang
- State Key Laboratory of Natural Medicines , China Pharmaceutical University , 24 Tongjia Xiang , Nanjing 210009 , China
| | - Run-Zhou Liu
- State Key Laboratory of Natural Medicines , China Pharmaceutical University , 24 Tongjia Xiang , Nanjing 210009 , China
| | - Yun-Xing Ji
- State Key Laboratory of Natural Medicines , China Pharmaceutical University , 24 Tongjia Xiang , Nanjing 210009 , China
| | - Bo Zhang
- State Key Laboratory of Natural Medicines , China Pharmaceutical University , 24 Tongjia Xiang , Nanjing 210009 , China
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16
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Tang R, Shao Z, Wang J, Liu Z, Li YM, Shen Y. Iron(II)-Catalyzed Radical Addition to Aldimines with Hantzsch Ester as a Two-Hydrogen Atom Donor. J Org Chem 2019; 84:8177-8184. [PMID: 31122013 DOI: 10.1021/acs.joc.9b01163] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The first Fe(OTf)2-catalyzed radical addition to aldimines with Hantzsch ester as a two-hydrogen atom donor is reported. The tin-free reaction works well for electron-deficient substrates and provides a potentially useful approach to α-branched amines and α-amino acids.
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Affiliation(s)
- Rui Tang
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Ziyan Shao
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Jiancheng Wang
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Zhongxian Liu
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Ya-Min Li
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
| | - Yuehai Shen
- Faculty of Life Science and Technology , Kunming University of Science and Technology , Kunming 650500 , China
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17
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Liang H, Ji YX, Wang RH, Zhang ZH, Zhang B. Visible-Light-Initiated Manganese-Catalyzed E-Selective Hydrosilylation and Hydrogermylation of Alkynes. Org Lett 2019; 21:2750-2754. [DOI: 10.1021/acs.orglett.9b00701] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Hao Liang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing 210009, China
| | - Yun-Xing Ji
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing 210009, China
| | - Rui-Han Wang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing 210009, China
| | - Zhi-Hao Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing 210009, China
| | - Bo Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjia Xiang, Nanjing 210009, China
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18
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Dong J, Wang X, Wang Z, Song H, Liu Y, Wang Q. Visible-light-initiated manganese-catalyzed Giese addition of unactivated alkyl iodides to electron-poor olefins. Chem Commun (Camb) 2019; 55:11707-11710. [DOI: 10.1039/c9cc06400a] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Visible-light-initiated Giese addition of unactivated alkyl iodides to electron-poor olefins with catalysis by decacarbonyl dimanganese, Mn2(CO)10 was reported.
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Affiliation(s)
- Jianyang Dong
- State Key Laboratory of Elemento-Organic Chemistry
- Research Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- People's Republic of China
| | - Xiaochen Wang
- State Key Laboratory of Elemento-Organic Chemistry
- Research Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- People's Republic of China
| | - Zhen Wang
- State Key Laboratory of Elemento-Organic Chemistry
- Research Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- People's Republic of China
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry
- Research Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- People's Republic of China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry
- Research Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- People's Republic of China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry
- Research Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- People's Republic of China
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19
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20
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Nuhant P, Oderinde MS, Genovino J, Juneau A, Gagné Y, Allais C, Chinigo GM, Choi C, Sach NW, Bernier L, Fobian YM, Bundesmann MW, Khunte B, Frenette M, Fadeyi OO. Visible-Light-Initiated Manganese Catalysis for C−H Alkylation of Heteroarenes: Applications and Mechanistic Studies. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707958] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Philippe Nuhant
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Martins S. Oderinde
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Julien Genovino
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Antoine Juneau
- Department de Chimie; Université du Québec á Montréal; Case Postale 8888, Succursale Centre-Ville Montréal Quebec H3C 3P8 Canada
| | - Yohann Gagné
- Department de Chimie; Université du Québec á Montréal; Case Postale 8888, Succursale Centre-Ville Montréal Quebec H3C 3P8 Canada
| | - Christophe Allais
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Gary M. Chinigo
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Chulho Choi
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Neal W. Sach
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Louise Bernier
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Yvette M. Fobian
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Mark W. Bundesmann
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Bhagyashree Khunte
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Mathieu Frenette
- Department de Chimie; Université du Québec á Montréal; Case Postale 8888, Succursale Centre-Ville Montréal Quebec H3C 3P8 Canada
| | - Olugbeminiyi O. Fadeyi
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
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Nuhant P, Oderinde MS, Genovino J, Juneau A, Gagné Y, Allais C, Chinigo GM, Choi C, Sach NW, Bernier L, Fobian YM, Bundesmann MW, Khunte B, Frenette M, Fadeyi OO. Visible-Light-Initiated Manganese Catalysis for C−H Alkylation of Heteroarenes: Applications and Mechanistic Studies. Angew Chem Int Ed Engl 2017; 56:15309-15313. [DOI: 10.1002/anie.201707958] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 09/01/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Philippe Nuhant
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Martins S. Oderinde
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Julien Genovino
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Antoine Juneau
- Department de Chimie; Université du Québec á Montréal; Case Postale 8888, Succursale Centre-Ville Montréal Quebec H3C 3P8 Canada
| | - Yohann Gagné
- Department de Chimie; Université du Québec á Montréal; Case Postale 8888, Succursale Centre-Ville Montréal Quebec H3C 3P8 Canada
| | - Christophe Allais
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Gary M. Chinigo
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Chulho Choi
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Neal W. Sach
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Louise Bernier
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Yvette M. Fobian
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Mark W. Bundesmann
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Bhagyashree Khunte
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
| | - Mathieu Frenette
- Department de Chimie; Université du Québec á Montréal; Case Postale 8888, Succursale Centre-Ville Montréal Quebec H3C 3P8 Canada
| | - Olugbeminiyi O. Fadeyi
- Pfizer Medicine Design & Oncology Medicinal Chemistry; 445 Eastern Point Road Groton CT 06340 USA
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22
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Gómez JE, Guo W, Gaspa S, Kleij AW. Copper-Catalyzed Synthesis of γ-Amino Acids Featuring Quaternary Stereocenters. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709511] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- José Enrique Gómez
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Wusheng Guo
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Silvia Gaspa
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Arjan W. Kleij
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institute of Research and Advanced Studies (ICREA); Pg. Lluís Companys 23 08010 Barcelona Spain
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23
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Gómez JE, Guo W, Gaspa S, Kleij AW. Copper-Catalyzed Synthesis of γ-Amino Acids Featuring Quaternary Stereocenters. Angew Chem Int Ed Engl 2017; 56:15035-15038. [DOI: 10.1002/anie.201709511] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Indexed: 01/13/2023]
Affiliation(s)
- José Enrique Gómez
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Wusheng Guo
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Silvia Gaspa
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Arjan W. Kleij
- Institute of Chemical Research of Catalonia (ICIQ); the Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institute of Research and Advanced Studies (ICREA); Pg. Lluís Companys 23 08010 Barcelona Spain
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24
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Ordóñez M, Cativiela C, Romero-Estudillo I. An update on the stereoselective synthesis of γ-amino acids. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.tetasy.2016.08.011] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Friestad GK, Banerjee K, Marié JC, Mali U, Yao L. Stereoselective access to tubuphenylalanine and tubuvaline: improved Mn-mediated radical additions and assembly of a tubulysin tetrapeptide analog. J Antibiot (Tokyo) 2016; 69:294-8. [PMID: 26883395 PMCID: PMC4924578 DOI: 10.1038/ja.2016.7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 01/12/2016] [Accepted: 01/18/2016] [Indexed: 01/05/2023]
Abstract
Synthesis of tubuphenylalanine and tubuvaline (Tuv), α-substituted γ-amino acid building blocks for tubulysin family of antimitotic compounds, has been improved using a radical addition reaction in the presence of unprotected hydroxyl functionality. The key carbon-carbon bond construction entails stereoselective Mn-mediated photolytic additions of alkyl iodides to the C=N bond of chiral N-acylhydrazones, and generates the chiral amines in high yield with complete stereocontrol. Reductive N-N bond cleavage and alcohol oxidation converted these amino alcohols into the corresponding γ-amino acids. The route to Tuv proceeded via peptide coupling with serine methyl ester, followed by a high-yielding sequence to convert the serine amide to a thiazole. Finally, peptide bond construction established the tubulysin framework in the form of a C-terminal alcohol analog. Attempted oxidation to the C-terminal carboxylate was unsuccessful; control experiments with dipeptide 18 showed a cyclization interfered with the desired oxidation process.
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Affiliation(s)
| | - Koushik Banerjee
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
| | | | - Umesh Mali
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
| | - Lei Yao
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
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26
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Slater KA, Friestad GK. Mn-Mediated Radical-Ionic Annulations of Chiral N-Acylhydrazones. J Org Chem 2015; 80:6432-40. [DOI: 10.1021/acs.joc.5b00863] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kara A. Slater
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Gregory K. Friestad
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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27
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Tauber J, Imbri D, Opatz T. Radical addition to iminium ions and cationic heterocycles. Molecules 2014; 19:16190-222. [PMID: 25310148 PMCID: PMC6270771 DOI: 10.3390/molecules191016190] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 09/22/2014] [Accepted: 09/22/2014] [Indexed: 01/08/2023] Open
Abstract
Carbon-centered radicals represent highly useful reactive intermediates in organic synthesis. Their nucleophilic character is reflected by fast additions to electron deficient C=X double bonds as present in iminium ions or cationic heterocycles. This review covers diverse reactions of preformed or in situ-generated cationic substrates with various types of C-radicals, including alkyl, alkoxyalkyl, trifluoromethyl, aryl, acyl, carbamoyl, and alkoxycarbonyl species. Despite its high reactivity, the strong interaction of the radical's SOMO with the LUMO of the cation frequently results in a high regioselectivity. Intra- and intermolecular processes such as the Minisci reaction, the Porta reaction, and the Knabe rearrangement will be discussed along with transition metal and photoredox catalysis or electrochemical methods to generate the odd-electron species.
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Affiliation(s)
- Johannes Tauber
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Dennis Imbri
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
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28
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Miyata O, Ueda M, Ito Y, Matsuda N, Nishida Y. Sequential Radical Addition and Fischer-Type Indolization Reactions of Conjugated Hydrazones for the Preparation of α-Alkylindole-3-acetic Acids. HETEROCYCLES 2014. [DOI: 10.3987/com-14-12957] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Charette AB, Lindsay V. Stereoselective formation of amines by nucleophilic addition to azomethine derivatives. Top Curr Chem (Cham) 2014; 343:33-73. [PMID: 24233253 DOI: 10.1007/128_2013_492] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This chapter describes state-of-the-art methods to prepare α-chiral amines by the addition of nonstabilized nucleophiles to imine derivatives. The first part of the chapter illustrates the most effective diastereoselective addition reaction (substrate controlled and chiral auxiliary based methods) whereas the second part focuses on catalytic asymmetric methods.
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30
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Friestad GK. Control of asymmetry in the radical addition approach to chiral amine synthesis. Top Curr Chem (Cham) 2014; 343:1-32. [PMID: 24085561 PMCID: PMC4114248 DOI: 10.1007/128_2013_481] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The state-of-the-science in asymmetric free radical additions to imino compounds is presented, beginning with an overview of methods involving stereocontrol by various chiral auxiliary approaches. Chiral N-acylhydrazones are discussed with respect to their use as radical acceptors for Mn-mediated intermolecular additions, from design to scope surveys to applications to biologically active targets. A variety of aldehydes and ketones serve as viable precursors for the chiral hydrazones, and a variety of alkyl iodides may be employed as radical precursors, as discussed in a critical review of the functional group compatibility of the reaction. Applications to amino acid and alkaloid synthesis are presented to illustrate the synthetic potential of these versatile stereocontrolled carbon-carbon bond construction reactions. Asymmetric catalysis is discussed, from seminal work on the stereocontrol of radical addition to imino compounds by non-covalent interactions with stoichiometric amounts of catalysts, to more recent examples demonstrating catalyst turnover.
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31
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Fukuyama T, Nakashima N, Okada T, Ryu I. Free-Radical-Mediated [2 + 2 + 1] Cycloaddition of Acetylenes, Amidines, and CO Leading to Five-Membered α,β-Unsaturated Lactams. J Am Chem Soc 2013; 135:1006-8. [DOI: 10.1021/ja312654q] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takahide Fukuyama
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531,
Japan
| | - Nao Nakashima
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531,
Japan
| | - Takuma Okada
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531,
Japan
| | - Ilhyong Ryu
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531,
Japan
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32
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Friestad GK, Ji A, Baltrusaitis J, Korapala CS, Qin J. Scope of Stereoselective Mn-Mediated Radical Addition to Chiral Hydrazones and Application in a Formal Synthesis of Quinine. J Org Chem 2012; 77:3159-80. [DOI: 10.1021/jo2026349] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gregory K. Friestad
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - An Ji
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Jonas Baltrusaitis
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | | | - Jun Qin
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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33
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Shen LT, Sun LH, Ye S. Highly Enantioselective γ-Amination of α,β-Unsaturated Acyl Chlorides with Azodicarboxylates: Efficient Synthesis of Chiral γ-Amino Acid Derivatives. J Am Chem Soc 2011; 133:15894-7. [DOI: 10.1021/ja206819y] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li-Tao Shen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Li-Hui Sun
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Song Ye
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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34
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Zhu Y, Khumsubdee S, Schaefer A, Burgess K. Asymmetric Syntheses of α-Methyl γ-Amino Acid Derivatives. J Org Chem 2011; 76:7449-57. [DOI: 10.1021/jo201215c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ye Zhu
- Department of Chemistry, Texas A & M University, Box 30012, College Station, Texas 77841, United States
| | - Sakunchai Khumsubdee
- Department of Chemistry, Texas A & M University, Box 30012, College Station, Texas 77841, United States
| | - Amber Schaefer
- Department of Chemistry, Texas A & M University, Box 30012, College Station, Texas 77841, United States
| | - Kevin Burgess
- Department of Chemistry, Texas A & M University, Box 30012, College Station, Texas 77841, United States
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35
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Friestad GK, Ji A, Korapala CS, Qin J. Intermolecular radical addition to N-acylhydrazones as a stereocontrol strategy for alkaloid synthesis: formal synthesis of quinine. Org Biomol Chem 2011; 9:4039-43. [PMID: 21537510 PMCID: PMC4114234 DOI: 10.1039/c1ob05219e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stereocontrolled Mn-mediated radical addition of alkyl iodides to chiral N-acylhydrazones enables strategic C-C bond disconnection of chiral amines. This strategy was examined in the context of a total synthesis of quinine, generating new findings of functional group compatibility leading to a revised strategy. Completion of a formal synthesis of quinine is presented, validating the application of Mn-mediated radical addition as a useful new C-C bond construction method for alkaloid synthesis. The Mn-mediated addition generates the chiral amine substructure of quinine with complete stereocontrol. Subsequent elaboration includes two successive ring closures to forge the azabicyclo[2.2.2]octane ring system of quincorine, linked to quinine through two known reactions.
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Affiliation(s)
- Gregory K Friestad
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA.
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36
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Radical Additions to Chiral Hydrazones: Stereoselectivity and Functional Group Compatibility. Top Curr Chem (Cham) 2011; 320:61-91. [DOI: 10.1007/128_2011_163] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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37
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Trifluoroacetylation of amines with trifluoroacetic acid in the presence of trichloroacetonitrile and triphenylphosphine. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.11.105] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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38
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Taniguchi T, Goto N, Nishibata A, Ishibashi H. Iron-Catalyzed Redox Radical Cyclizations of 1,6-Dienes and Enynes. Org Lett 2009; 12:112-5. [DOI: 10.1021/ol902562j] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tsuyoshi Taniguchi
- School of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Naoya Goto
- School of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Asami Nishibata
- School of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Hiroyuki Ishibashi
- School of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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