1
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Zhang TB, Wang F, Ouyang JY, Luo ZW, Qin JH, Li JH, Ouyang XH. Aryldiazonium-Salt-Triggered Carboxylative Azotization of Pyrroles or Indoles with Polyhalomethanes via Halogen-Atom Transfer (XAT). Org Lett 2024. [PMID: 38175821 DOI: 10.1021/acs.orglett.3c03701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
A halogen-atom-transfer (XAT)-based method for carbonylazotization of pyrroles or indoles with aryldiazonium salts and polyhalomethanes via dual C(sp2)-H bond functionalization is described. Using aryldiazonium salts realizes carbonylation/azotization of pyrroles or indoles via polyhalomethyl-radical-mediated and electrophilic substitution, thus providing a green, efficient, and step-economy approach for synthesis of multifunctional pyrroles or indoles from the easily available substrates. Notably, this strategy relies on the use of aryldiazonium salts to extend the well-established iodine atom transfer to bromine or chlorine atom transfer.
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Affiliation(s)
- Tian-Bao Zhang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Fang Wang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Jun-Yao Ouyang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Zhen-Wei Luo
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Jing-Hao Qin
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Jin-Heng Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Xuan-Hui Ouyang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
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2
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Li H, Qiu X, Zhang X, Wu X. Sulfonyl Group-Induced Remote C(sp 3)-N Bond Construction through Hydrogen Atom Transfer. Org Lett 2023. [PMID: 38054933 DOI: 10.1021/acs.orglett.3c03401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
This work demonstrates sulfonyl group-induced remote C(sp3)-N bond construction using a strategy of merging aryl radical-mediated halogen atom transfer and intramolecularly regioselective hydrogen atom transfer (HAT). A plethora of aliphatic sulfones, sulfonamides, and sulfonates are amenable and undergo regioselective C(sp3)-H amination by utilizing an iron salt at room temperature. This protocol involves iodine atom transfer, a HAT process enabled by an alkyl radical adjacent to a sulfonyl group, and amination mediated by an aryl diazonium salt.
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Affiliation(s)
- Haotian Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
| | - Xiancheng Qiu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
| | - Xu Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
| | - Xinxin Wu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
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3
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Maity A, Studer A. 1,2-Aminoxyalkylation of alkenes with alkyl iodides and TEMPONa through SET- and XAT-processes. Chem Sci 2023; 14:7675-7680. [PMID: 37476718 PMCID: PMC10355098 DOI: 10.1039/d3sc02544f] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 06/23/2023] [Indexed: 07/22/2023] Open
Abstract
1,2-Aminoxyalkylation of alkenes with alkyl iodides and TEMPONa in combination with an aryldiazonium salt as an XAT mediator is reported. Various primary, secondary and tertiary alkyl iodides engage as C-radical precursors in the 1,2-aminoxyalkylation with electrophilic alkenes as radical acceptors. The product alkoxyamines are readily transformed to the corresponding alcohols or ketones upon reduction or oxidation, respectively. Mechanistic investigations reveal that aryl radicals, generated through SET-reduction of the aryl diazonium salt with TEMPONa, engage in XAT from unactivated alkyl halides to give alkyl radicals that can add to alkenes. Trapping of the adduct radicals with TEMPO provides the 1,2-aminoxyalkylation products. Transition metals are not required for these transformations that are conducted under mild conditions. Perfluoroalkyl halides directly react with TEMPONa and an aryldiazonium salt as XAT-mediator is not required for alkene 1,2-aminoxyperfluoroalkylation.
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Affiliation(s)
- Anirban Maity
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Corrensstraße 40 48149 Munster Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Corrensstraße 40 48149 Munster Germany
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4
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Wang M, Zhang C, Ci C, Jiang H, Dixneuf PH, Zhang M. Room Temperature Construction of Vicinal Amino Alcohols via Electroreductive Cross-Coupling of N-Heteroarenes and Carbonyls. J Am Chem Soc 2023; 145:10967-10973. [PMID: 37075201 DOI: 10.1021/jacs.3c02776] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2023]
Abstract
Despite the widespread applications of α-hydroxyalkyl cyclic amines, direct and diverse access to such a class of unique vicinal amino alcohols still remains, to date, a challenge. Here, through a strategy of electroreductive α-hydroxyalkylation of inactive N-heteroarenes with ketones or electron-rich arylaldehydes, we describe a room temperature approach for the direct construction of α-hydroxyalkyl cyclic amines, which features a broad substrate scope, operational simplicity, high chemoselectivity, and no need for pressurized H2 gas and transition metal catalysts. The zinc ion generated from anode oxidation plays a crucial role in the activation of both reactants by decreasing their reduction potentials. The strategy of electroreduction in combination with substrate activation by Lewis acids in this work is anticipated to develop more useful transformations.
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Affiliation(s)
- Maorui Wang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Chengqian Zhang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Chenggang Ci
- Key Laboratory of Computational Catalytic Chemistry of Guizhou Province, Department of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | | | - Min Zhang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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5
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Chowdhury R, Elek GZ, Meana-Baamonde B, Mendoza A. Modular Synthesis of (Borylmethyl)silanes through Orthogonal Functionalization of a Carbon Atom. Org Lett 2023; 25:1935-1940. [PMID: 36898045 PMCID: PMC10043938 DOI: 10.1021/acs.orglett.3c00474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
(Borylmethyl)trimethylsilanes are important building blocks in organic synthesis displaying a unique reactivity. Yet, the synthesis of more advanced derivatives is limited by the advanced silicon intermediates required for their preparation. Herein, a one-pot synthesis of (borylmethyl)silanes is developed, sourced on available alkyl-, aryl-, alkoxy-, aryloxy-, and silyl-hydrosilane materials. The privileged reactivity of N-hydroxyphthalimidyl diazoacetate (NHPI-DA) in Si-H insertion and α-silyl redox-active esters in different decarboxylative borylation reactions are scrutinized.
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Affiliation(s)
- Rajdip Chowdhury
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691-Stockholm, Sweden
| | - Gábor Zoltán Elek
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691-Stockholm, Sweden
- Department of Chemistry and Biotechnology, Tallinn University of Technology, 12618 Tallinn, Estonia
| | - Beatriz Meana-Baamonde
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691-Stockholm, Sweden
- Institute of Molecular Science (ICMol), University of Valencia, 46980 Paterna, Spain
| | - Abraham Mendoza
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691-Stockholm, Sweden
- Institute of Molecular Science (ICMol), University of Valencia, 46980 Paterna, Spain
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6
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Zeng X, Wang C, Yan W, Rong J, Song Y, Xiao Z, Cai A, Liang SH, Liu W. Aryl Radical Enabled, Copper-Catalyzed Sonogashira-Type Cross-Coupling of Alkynes with Alkyl Iodides. ACS Catal 2023; 13:2761-2770. [PMID: 37800120 PMCID: PMC10552849 DOI: 10.1021/acscatal.2c05901] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Despite the success of Sonogashira coupling for the synthesis of arylalkynes and conjugated enynes, the engagement of unactivated alkyl halides in such reactions remains historically challenging. We report herein a strategy that merges Cu-catalyzed alkyne transfer with the aryl radical activation of carbon-halide bonds to enable a general approach for the coupling of alkyl iodides with terminal alkynes. This unprecedented Sonogashira-type cross-coupling reaction tolerates a broad range of functional groups and has been applied to the late-stage cross-coupling of densely functionalized pharmaceutical agents as well as the synthesis of positron emission tomography tracers.
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Affiliation(s)
- Xiaojun Zeng
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Chao Wang
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Wenhao Yan
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Jian Rong
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Yanshan Song
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Zhiwei Xiao
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Aijie Cai
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Steven H Liang
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Wei Liu
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
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7
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Transition-metal free C-N bond formation from alkyl iodides and diazonium salts via halogen-atom transfer. Nat Commun 2022; 13:7961. [PMID: 36575172 PMCID: PMC9794826 DOI: 10.1038/s41467-022-35613-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 12/13/2022] [Indexed: 12/28/2022] Open
Abstract
Construction of C-N bond continues to be one part of the most significant goals in organic chemistry because of the universal applications of amines in pharmaceuticals, materials and agrochemicals. However, E2 elimination through classic SN2 substitution of alkyl halides lead to generation of alkenes as major side-products. Thus, formation of a challenging C(sp3)-N bond especially on tertiary carbon center remains highly desirable. Herein, we present a practical alternative to prepare primary, secondary and tertiary alkyl amines with high efficiency between alkyl iodides and easily accessible diazonium salts. This robust transformation only employs Cs2CO3 promoting halogen-atom transfer (XAT) process under transition-metal-free reaction conditions, thus providing a rapid method to assemble diverse C(sp3)-N bonds. Moreover, diazonium salts served as alkyl radical initiator and amination reagent in the reaction. Mechanism studies suggest this reaction undergo through halogen-atom transfer process to generate active alkyl radical which couples with diazonium cations to furnish final products.
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8
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Chen L, Jiang K, Zeng G, Yin B. Photoinduced Pd-Catalyzed C sp2–H/C sp3–H Dehydrocoupling Reaction Employing Polyhaloaromatics as the Dehydrogenating Agent. Org Lett 2022; 24:9071-9075. [DOI: 10.1021/acs.orglett.2c03708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lin Chen
- School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan, Tianhe, Guangzhou 510640, China
| | - Kai Jiang
- School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan, Tianhe, Guangzhou 510640, China
| | - Guohui Zeng
- School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan, Tianhe, Guangzhou 510640, China
| | - Biaolin Yin
- School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan, Tianhe, Guangzhou 510640, China
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9
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Ding H, Zhang S, Sun Z, Ma Q, Li Y, Yuan Y, Jia X. Tris(4-bromophenyl)aminium Hexachloroantimonate as a "Waste-Utilized"-Type Initiator-Promoted C-H Chlorination via C-H Activation Relay: Synthesis of Chlorinated Pyrroles. J Org Chem 2022; 87:15139-15151. [PMID: 36398528 DOI: 10.1021/acs.joc.2c01641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Using tris(4-bromophenyl)aminium hexachloroantimonate as a "waste-utilized"-type initiator, the aerobic oxidation of the sp3 C-H bond of proline esters was realized via C-H activation relay, giving a series of halogenated pyrroles in high yields. The mechanistic study revealed that the counterion, SbCl6-, was involved in the radical chlorination process, which provides a new way to understand the role of the counterions.
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Affiliation(s)
- Han Ding
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Shuwei Zhang
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Zheng Sun
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Qiyuan Ma
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Yuemei Li
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Yu Yuan
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Xiaodong Jia
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
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10
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Sarkar S, Wagulde S, Jia X, Gevorgyan V. General and Selective Metal-Free Radical α-C-H Borylation of Aliphatic Amines. Chem 2022; 8:3096-3108. [PMID: 36571075 PMCID: PMC9784107 DOI: 10.1016/j.chempr.2022.07.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Despite recent developments, selective C(sp3)-H borylation of feedstock amines remains a formidable challenge. Herein, we have developed a general, mild, and photoinduced transition metal- and strong base-free method for α-C(sp3)-H borylation of amines. This protocol features a regioselective 1,5-hydrogen atom transfer process to access key α-aminoalkyl radical intermediate using commercially available easy-to-install/remove iodobenzoyl radical translocating group. Remarkably, this general, efficient, and operationally simple method allows activation of primary and secondary α-C-H sites of a broad range of acyclic and cyclic amines toward highly regio- and diastereoselective synthesis of valuable α-aminoboronates. Utility of this protocol has been demonstrated by its employment in late-stage borylation of structurally complex amines and formal C-H arylation reaction of amines. Thus, it is expected that this operationally simple, general, and practical method will find broad application in organic synthesis and drug discovery.
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Affiliation(s)
- Sumon Sarkar
- Department of Chemistry and Biochemistry, University of Texas at Dallas, 800 West Campbell Road, BSB 13, Richardson, Texas, 75080 (USA)
| | - Sidhant Wagulde
- Department of Chemistry and Biochemistry, University of Texas at Dallas, 800 West Campbell Road, BSB 13, Richardson, Texas, 75080 (USA)
| | - Xiangqing Jia
- Department of Chemistry and Biochemistry, University of Texas at Dallas, 800 West Campbell Road, BSB 13, Richardson, Texas, 75080 (USA)
| | - Vladimir Gevorgyan
- Department of Chemistry and Biochemistry, University of Texas at Dallas, 800 West Campbell Road, BSB 13, Richardson, Texas, 75080 (USA)
- Lead contact
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11
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Guo R, Xiao H, Li S, Luo Y, Bai J, Zhang M, Guo Y, Qi X, Zhang G. Photoinduced Copper‐Catalyzed Asymmetric C(sp
3
)−H Alkynylation of Cyclic Amines by Intramolecular 1,5‐Hydrogen Atom Transfer. Angew Chem Int Ed Engl 2022; 61:e202208232. [DOI: 10.1002/anie.202208232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Indexed: 01/22/2023]
Affiliation(s)
- Rui Guo
- CCNU-uOttawa Joint Research Centre Key Laboratory of Pesticides & Chemical Biology Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and Health College of Chemistry Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Center for Excellence in Molecular Synthesis University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Haijing Xiao
- CCNU-uOttawa Joint Research Centre Key Laboratory of Pesticides & Chemical Biology Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and Health College of Chemistry Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
| | - Sijia Li
- CCNU-uOttawa Joint Research Centre Key Laboratory of Pesticides & Chemical Biology Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and Health College of Chemistry Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
| | - Yixin Luo
- Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan Hubei 430072 P. R. China
| | - Jiahui Bai
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Center for Excellence in Molecular Synthesis University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Mengzhen Zhang
- CCNU-uOttawa Joint Research Centre Key Laboratory of Pesticides & Chemical Biology Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and Health College of Chemistry Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
| | - Yinlong Guo
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Center for Excellence in Molecular Synthesis University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Xiaotian Qi
- Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University Wuhan Hubei 430072 P. R. China
| | - Guozhu Zhang
- CCNU-uOttawa Joint Research Centre Key Laboratory of Pesticides & Chemical Biology Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and Health College of Chemistry Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Center for Excellence in Molecular Synthesis University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
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12
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Wang Y, Chen S, Chen X, Zangarelli A, Ackermann L. Photo-Induced Ruthenium-Catalyzed Double Remote C(sp 2 )-H / C(sp 3 )-H Functionalizations by Radical Relay. Angew Chem Int Ed Engl 2022; 61:e202205562. [PMID: 35527721 PMCID: PMC9401009 DOI: 10.1002/anie.202205562] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Indexed: 12/25/2022]
Abstract
Distal C(sp2 )-H and C(sp3 )-H functionalizations have recently emerged as step-economical tools for molecular synthesis. However, while the C(sp2 )-C(sp3 ) construction is of fundamental importance, its formation through double remote C(sp2 )-H/C(sp3 )-H activation has proven elusive. By merging the ruthenium-catalyzed meta-C(sp2 )-H functionalization with an aliphatic hydrogen atom transfer (HAT) process, we, herein, describe the catalyzed twofold remote C(sp2 )-H/C(sp3 )-H functionalizations via photo-induced ruthenium-mediated radical relay. Thus, meta-C(sp2 )-H arene bonds and remote C(sp3 )-H alkane bonds were activated by a single catalyst in a single operation. This process was accomplished at room temperature by visible light-notably without exogenous photocatalysts. Experimental and computational theory studies uncovered a manifold comprising ortho-C-H activation, single-electron-transfer (SET), 1,n-HAT (n=5-7) and σ-activation by means of a single ruthenium(II) catalyst.
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Affiliation(s)
- Yulei Wang
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry (WISCh)Georg-August-UniversitätTammanstraße 237077GöttingenGermany
| | - Shan Chen
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry (WISCh)Georg-August-UniversitätTammanstraße 237077GöttingenGermany
| | - Xinran Chen
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry (WISCh)Georg-August-UniversitätTammanstraße 237077GöttingenGermany
- Department of ChemistryZhejiang UniversityHangzhou310027China
| | - Agnese Zangarelli
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry (WISCh)Georg-August-UniversitätTammanstraße 237077GöttingenGermany
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry (WISCh)Georg-August-UniversitätTammanstraße 237077GöttingenGermany
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13
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Guo R, Xiao H, Li S, Luo Y, Bai J, Zhang M, Qi X, Guo Y, Zhang G. Photoinduced Copper‐Catalyzed Asymmetric C(sp3)‐H Alkynylation of Cyclic Amines by Intramolecular 1,5‐Hydrogen Atom Transfer. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Rui Guo
- Shanghai Institute of Organic Chemistry State Key Laborary of Organometallic Chemistry CHINA
| | - Haijing Xiao
- Central China Normal University Department of Chemistry CHINA
| | - Sijia Li
- Central China Normal University Department of Chemistry CHINA
| | - Yixin Luo
- Wuhan University Department of Chemistry CHINA
| | - Jiahui Bai
- Shanghai Institute of Organic Chemistry State Key Laborary of Organometallic Chemistry CHINA
| | - Mengzhen Zhang
- Central China Normal University Department of Chemistry CHINA
| | - Xiaotian Qi
- Wuhan University Department of Chemistry CHINA
| | - Yinlong Guo
- Shanghai Institute of Organic Chemistry State Key Laborary of Organometallic Chemistry CHINA
| | - Guozhu Zhang
- Shanghai Institute of Organic Chemistry Chemistry 345 Lingling Rd 200032 Shanghai CHINA
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14
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Das A, Buzzetti L, Puriņš M, Waser J. Palladium-Catalyzed trans-Hydroalkoxylation: Counterintuitive Use of an Aryl Iodide Additive to Promote C–H Bond Formation. ACS Catal 2022; 12:7565-7570. [PMID: 35799768 PMCID: PMC9251722 DOI: 10.1021/acscatal.2c01809] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/03/2022] [Indexed: 12/31/2022]
Abstract
![]()
We report an enantioselective
palladium-catalyzed trans-hydroalkoxylation of propargylic
amines with a trifluoroacetaldehyde-derived
tether to build chiral oxazolidines. Diastereoselective hydrogenation
using a heterogeneous palladium catalyst then gave access to protected
benzylic amino alcohols in 45–87% yields and 84–94%
ee values. Hydroalkoxylation of the alkynes required a catalytic amount
of aryl iodide, highlighting the counterintuitive key role played
by a putative Pd(II)/ArI oxidative addition complex to promote oxypalladation/protodemetalation.
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Affiliation(s)
- Ashis Das
- Laboratory of Catalysis and Organic Synthesis and NCCR Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
| | - Luca Buzzetti
- Laboratory of Catalysis and Organic Synthesis and NCCR Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
| | - Mikus Puriņš
- Laboratory of Catalysis and Organic Synthesis and NCCR Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis and NCCR Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
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15
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Wang Y, Chen S, Chen X, Zangarelli A, Ackermann L. Foto‐Induzierte Ruthenium‐Katalysierte Doppel C(sp
2
)−H/C(sp
3
)−H Funktionalisierungen durch Radikalübertragungen. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yulei Wang
- Institut für Organische und Biomolekulare Chemie und Wöhler Research Institute for Sustainable Chemistry (WISCh) Georg-August-Universität Tammanstraße 2 37077 Göttingen Deutschland
| | - Shan Chen
- Institut für Organische und Biomolekulare Chemie und Wöhler Research Institute for Sustainable Chemistry (WISCh) Georg-August-Universität Tammanstraße 2 37077 Göttingen Deutschland
| | - Xinran Chen
- Institut für Organische und Biomolekulare Chemie und Wöhler Research Institute for Sustainable Chemistry (WISCh) Georg-August-Universität Tammanstraße 2 37077 Göttingen Deutschland
- Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Agnese Zangarelli
- Institut für Organische und Biomolekulare Chemie und Wöhler Research Institute for Sustainable Chemistry (WISCh) Georg-August-Universität Tammanstraße 2 37077 Göttingen Deutschland
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie und Wöhler Research Institute for Sustainable Chemistry (WISCh) Georg-August-Universität Tammanstraße 2 37077 Göttingen Deutschland
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16
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Li K, Li Q, Shi Q, He Y, Yu W, Chang J. Iodine‐Mediated sp3 C–H Amination Reactions Forming α‐Amino Ketones/Esters and Fused Imidazoles. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kailu Li
- Zhengzhou University College of Chemistry CHINA
| | - Qianmin Li
- Zhengzhou University College of Chemistry CHINA
| | - Qinhao Shi
- Zhengzhou University College of Chemistry CHINA
| | - Yanmin He
- Zhengzhou University College of Chemistry CHINA
| | - Wenquan Yu
- Zhengzhou University College of Chemistry 100 Science Avenue 450001 Zhengzhou CHINA
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17
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Efremova MM, Rostovskii NV. The VIth International Symposium “The Chemistry of Diazo Compounds and Related Systems” (DIAZO 2021). RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1070428022030113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Visible-light-mediated metal-free decarboxylative acylation of electron-deficient quinolines using α-ketoacids under ambient air. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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Shi Q, Pei Z, Song J, Li SJ, Wei D, Coote ML, Lan Y. Diradical Generation via Relayed Proton-Coupled Electron Transfer. J Am Chem Soc 2022; 144:3137-3145. [PMID: 35133141 DOI: 10.1021/jacs.1c12360] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Diradical generation followed by radical-radical cross-coupling is a powerful synthetic tool, but its detailed mechanism has yet to be established. Herein, we proposed and confirmed a new model named relayed proton-coupled electron transfer (relayed-PCET) for diradical generation, which could open a door for new radical-radical cross-coupling reactions. Quantum mechanics calculations were performed on a selected carbene-mediated diradical cross-coupling reaction model and a designed model, and the exact electronic structural changes during the radical processes have been observed for the first time.
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Affiliation(s)
- Qianqian Shi
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Zhipeng Pei
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Jinshuai Song
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Shi-Jun Li
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Donghui Wei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Michelle L Coote
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
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20
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Abstract
In recent years, visible light-induced transition metal catalysis has emerged as a new paradigm in organic photocatalysis, which has led to the discovery of unprecedented transformations as well as the improvement of known reactions. In this subfield of photocatalysis, a transition metal complex serves a double duty by harvesting photon energy and then enabling bond forming/breaking events mostly via a single catalytic cycle, thus contrasting the established dual photocatalysis in which an exogenous photosensitizer is employed. In addition, this approach often synergistically combines catalyst-substrate interaction with photoinduced process, a feature that is uncommon in conventional photoredox chemistry. This Review describes the early development and recent advances of this emerging field.
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Affiliation(s)
- Kelvin Pak Shing Cheung
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Sumon Sarkar
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Vladimir Gevorgyan
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
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21
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Zheng T, Berman JL, Michael FE. Diastereoconvergent synthesis of anti-1,2-amino alcohols with N-containing quaternary stereocenters via selenium-catalyzed intermolecular C–H amination. Chem Sci 2022; 13:9685-9692. [PMID: 36091896 PMCID: PMC9400650 DOI: 10.1039/d2sc02648a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 07/25/2022] [Indexed: 11/21/2022] Open
Abstract
We report a diastereoconvergent synthesis of anti-1,2-amino alcohols bearing N-containing quaternary stereocenters using an intermolecular direct C–H amination of homoallylic alcohol derivatives catalyzed by a phosphine selenide. Destruction of the allylic stereocenter during the selenium-catalyzed process allows selective formation of a single diastereomer of the product starting from any diastereomeric mixture of the starting homoallylic alcohol derivatives, eliminating the need for the often-challenging diastereoselective preparation of starting materials. Mechanistic studies show that the diastereoselectivity is controlled by a stereoelectronic effect (inside alkoxy effect) on the transition state of the final [2,3]-sigmatropic rearrangement, leading to the observed anti selectivity. The power of this protocol is further demonstrated on an extension to the synthesis of syn-1,4-amino alcohols from allylic alcohol derivatives, constituting a rare example of 1,4-stereoinduction. We report a diastereoconvergent synthesis of anti-1,2-amino alcohols bearing N-containing quaternary stereocenters using an intermolecular direct C–H amination of homoallylic alcohol derivatives catalyzed by a phosphine selenide.![]()
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Affiliation(s)
- Tianyi Zheng
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA
| | - Janna L. Berman
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA
| | - Forrest E. Michael
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA
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22
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Jiang K, Li SJ, Liu QP, Yu N, Li YL, Zhou YQ, He KC, Lin J, Zheng TY, Lang J, Lan Y, Wei Y. Iminyl radical-triggered relay annulation for the construction of bridged aza-tetracycles bearing four contiguous stereogenic centers. Chem Sci 2022; 13:7283-7288. [PMID: 35799821 PMCID: PMC9214848 DOI: 10.1039/d2sc01548j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 05/27/2022] [Indexed: 11/21/2022] Open
Abstract
Bridged tetracyclic nitrogen scaffolds are found in numerous biologically active molecules and medicinally relevant structures. Traditional methods usually require tedious reaction steps, and/or the use of structurally specific starting materials. We report an unprecedented, iminyl radical-triggered relay annulation from oxime-derived peresters and azadienes, which shows good substrate scope and functional group compatibility, and can deliver various bridged aza-tetracyclic compounds with complex molecular topology and four contiguous stereogenic centers (dr > 19 : 1) in a single operation. This transformation represents the first example of trifunctionalization of iminyl radicals through simultaneous formation of one C–N and two C–C bonds. DFT calculation studies were conducted to obtain an in-depth insight into the reaction pathways, which revealed that the reactions involved an interesting 1,6-hydrogen atom transfer process. A novel radical relay annulation is realized for the construction of various bridged aza-tetracyclic compounds with complex molecular topology and four contiguous stereogenic centers (dr > 19 : 1) in a single operation.![]()
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Affiliation(s)
- Kun Jiang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Shi-Jun Li
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University, Zhengzhou, Henan, 450001, China
| | - Qing-Peng Liu
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Ning Yu
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Yu-Lin Li
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Yu-Qiang Zhou
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Kui-Cheng He
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Jing Lin
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Ting-Yu Zheng
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Jian Lang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Yu Lan
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University, Zhengzhou, Henan, 450001, China
| | - Ye Wei
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
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23
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Cai A, Yan W, Wang C, Liu W. Copper-Catalyzed Difluoromethylation of Alkyl Iodides Enabled by Aryl Radical Activation of Carbon-Iodine Bonds. Angew Chem Int Ed Engl 2021; 60:27070-27077. [PMID: 34652873 DOI: 10.1002/anie.202111993] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Indexed: 01/07/2023]
Abstract
The engagement of unactivated alkyl halides in copper-catalyzed cross-coupling reactions has been historically challenging, due to their low reduction potential and the slow oxidative addition of copper(I) catalysts. In this work, we report a novel strategy that leverages the halogen abstraction ability of aryl radicals, thereby engaging a diverse range of alkyl iodides in copper-catalyzed Negishi-type cross-coupling reactions at room temperature. Specifically, aryl radicals generated via copper catalysis efficiently initiate the cleavage of the carbon-iodide bonds of alkyl iodides. The alkyl radicals thus generated enter the copper catalytic cycles to couple with a difluoromethyl zinc reagent, thus furnishing the alkyl difluoromethane products. This unprecedented Negishi-type difluoromethylation approach has been applied to the late-stage modification of densely functionalized pharmaceutical agents and natural products.
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Affiliation(s)
- Aijie Cai
- Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Wenhao Yan
- Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Chao Wang
- Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Wei Liu
- Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA
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24
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Cai A, Yan W, Wang C, Liu W. Copper‐Catalyzed Difluoromethylation of Alkyl Iodides Enabled by Aryl Radical Activation of Carbon–Iodine Bonds. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202111993] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Aijie Cai
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
| | - Wenhao Yan
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
| | - Chao Wang
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
| | - Wei Liu
- Department of Chemistry University of Cincinnati Cincinnati OH 45221 USA
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25
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Cao Z, Li J, Zhang G. Photo-induced copper-catalyzed sequential 1,n-HAT enabling the formation of cyclobutanols. Nat Commun 2021; 12:6404. [PMID: 34737326 PMCID: PMC8569169 DOI: 10.1038/s41467-021-26670-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 10/08/2021] [Indexed: 11/09/2022] Open
Abstract
Cyclobutanols are privileged cyclic skeletons in natural products and synthetic building blocks. C(sp3)-H functionalization is a prolonged challenge in organic synthesis. The synthesis of cyclobutanols through double C(sp3)-H bond functionalization remains elusive. Here we report the efficient synthesis of cyclobutanols through intermolecular radical [3 + 1] cascade cyclization, involving the functionalization of two C - H bonds through sequential hydrogen atom transfer. The copper complex reduces the iodomethylsilyl alcohols efficiently under blue-light irradiation to initiate the tandem transformation. The mild reaction tolerates a broad range of functional groups and allows for the facile generation of elaborate polycyclic structures.
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Affiliation(s)
- Zhusong Cao
- College of Chemistry, Central China Normal University (CCNU), 152 Luoyu Road, Wuhan, Hubei, 430079, P. R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. China
| | - Jianye Li
- College of Chemistry, Central China Normal University (CCNU), 152 Luoyu Road, Wuhan, Hubei, 430079, P. R. China
| | - Guozhu Zhang
- College of Chemistry, Central China Normal University (CCNU), 152 Luoyu Road, Wuhan, Hubei, 430079, P. R. China. .,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. China.
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26
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Sinha SK, Guin S, Maiti S, Biswas JP, Porey S, Maiti D. Toolbox for Distal C-H Bond Functionalizations in Organic Molecules. Chem Rev 2021; 122:5682-5841. [PMID: 34662117 DOI: 10.1021/acs.chemrev.1c00220] [Citation(s) in RCA: 166] [Impact Index Per Article: 55.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Transition metal catalyzed C-H activation has developed a contemporary approach to the omnipresent area of retrosynthetic disconnection. Scientific researchers have been tempted to take the help of this methodology to plan their synthetic discourses. This paradigm shift has helped in the development of industrial units as well, making the synthesis of natural products and pharmaceutical drugs step-economical. In the vast zone of C-H bond activation, the functionalization of proximal C-H bonds has gained utmost popularity. Unlike the activation of proximal C-H bonds, the distal C-H functionalization is more strenuous and requires distinctly specialized techniques. In this review, we have compiled various methods adopted to functionalize distal C-H bonds, mechanistic insights within each of these procedures, and the scope of the methodology. With this review, we give a complete overview of the expeditious progress the distal C-H activation has made in the field of synthetic organic chemistry while also highlighting its pitfalls, thus leaving the field open for further synthetic modifications.
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Affiliation(s)
- Soumya Kumar Sinha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Srimanta Guin
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sudip Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Jyoti Prasad Biswas
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sandip Porey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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27
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Cai A, Yan W, Liu W. Aryl Radical Activation of C-O Bonds: Copper-Catalyzed Deoxygenative Difluoromethylation of Alcohols. J Am Chem Soc 2021; 143:9952-9960. [PMID: 34180233 DOI: 10.1021/jacs.1c04254] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Given their ubiquity in natural products and pharmaceuticals, alcohols represent one of the most attractive starting materials for the construction of C-C bonds. We report herein the first catalytic strategy to harness the reactivity of aryl radicals for the activation of C-O bonds in alcohol-derived xanthate esters, allowing for the discovery of the first catalytic deoxygenative difluoromethylation reaction. Under copper-catalyzed conditions, a wide variety of alkyl xanthate esters, readily synthesized from alcohol feedstocks, were activated by catalytically generated aryl radicals and were converted to the alkyl-difluoromethane products via alkyl radical intermediates. This scalable protocol exhibits a broad substrate scope and functional group tolerance, enabling late-stage modification of complex pharmaceutical agents. A one-pot protocol has been developed that allows for the direct use of free alcohols without purification of the xanthate esters. Mechanistic studies are consistent with the hypothesis of aryl radicals being formed and initiating the cleavage of the C-O bonds of xanthate esters, to generate alkyl radicals as the key intermediates. This aryl radical activation approach represents a new strategy for the activation of alcohols as cross-coupling partners.
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Affiliation(s)
- Aijie Cai
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Wenhao Yan
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Wei Liu
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
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28
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Kvasovs N, Iziumchenko V, Palchykov V, Gevorgyan V. Visible Light-Induced Pd-Catalyzed Alkyl-Heck Reaction of Oximes. ACS Catal 2021; 11:3749-3754. [PMID: 34422448 PMCID: PMC8372551 DOI: 10.1021/acscatal.1c00267] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A visible light-induced palladium-catalyzed oxidative C-H alkylation of oximes has been developed. This mild protocol allows for an efficient atom economical C-C bond construction of alkyl-substituted oximes. A broad range of primary, secondary, and tertiary alkyl bromides and iodides, as well as a range of different formaldoximes, can efficiently undergo this transformation. The method features visible light-induced generation of nucleophilic hybrid alkyl Pd radical intermediates, which upon radical addition at the imine moiety and a subsequent β-hydrogen elimination deliver substituted imines.
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Affiliation(s)
- Nikita Kvasovs
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080-3021, United States
| | - Valeriia Iziumchenko
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080-3021, United States
| | - Vitalii Palchykov
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080-3021, United States
| | - Vladimir Gevorgyan
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080-3021, United States
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29
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Abstract
The synthetic utility of aryl radicals has been established in the last century, however, their broad applications were hampered by ineffective generation methods. It was in the last decade, that a rapid development of various redox systems took place, thus triggering a renaissance of aryl radical chemistry. This tutorial review focuses on the start-of-the-art methods for generation of aryl radicals. Primarily, various light-induced systems, including photoredox catalysis, visible light transition metal catalysis, and chemistry of electron donor-acceptor complexes, are reviewed. The main current precursors of aryl radicals are evaluated together with the selected examples of their modern applications.
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Affiliation(s)
- Nikita Kvasovs
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell, BSB13, Richardson, Texas 75080-3021, USA.
| | - Vladimir Gevorgyan
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell, BSB13, Richardson, Texas 75080-3021, USA.
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30
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Cao Z, Li J, Sun Y, Zhang H, Mo X, Cao X, Zhang G. Photo-induced copper-catalyzed alkynylation and amination of remote unactivated C(sp 3)-H bonds. Chem Sci 2021; 12:4836-4840. [PMID: 34163735 PMCID: PMC8179574 DOI: 10.1039/d0sc05883a] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 02/14/2021] [Indexed: 01/18/2023] Open
Abstract
A method for remote radical C-H alkynylation and amination of diverse aliphatic alcohols has been developed. The reaction features a copper nucleophile complex formed in situ as a photocatalyst, which reduces the silicon-tethered aliphatic iodide to an alkyl radical to initiate 1,n-hydrogen atom transfer. Unactivated secondary and tertiary C-H bonds at β, γ, and δ positions can be functionalized in a predictable manner.
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Affiliation(s)
- Zhusong Cao
- Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Jianye Li
- College of Chemistry, Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
| | - Youwen Sun
- Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Hanwen Zhang
- Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Xueling Mo
- Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Xin Cao
- Zhongshan Hospital, Fudan University 180 Fenglin Road Shanghai 200032 P. R. China
| | - Guozhu Zhang
- Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Center for Excellence in Molecular Synthesis, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
- College of Chemistry, Central China Normal University (CCNU) 152 Luoyu Road Wuhan Hubei 430079 P. R. China
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31
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Shen J, Xu J, He L, Ouyang Y, Huang L, Li W, Zhu Q, Zhang P. Photoinduced Rapid Multicomponent Cascade Reaction of Aryldiazonium Salts with Unactivated Alkenes and TMSN3. Org Lett 2021; 23:1204-1208. [DOI: 10.1021/acs.orglett.0c04148] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jiabin Shen
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 311121, China
| | - Jun Xu
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Lei He
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Yani Ouyang
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Lin Huang
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Wanmei Li
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Qing Zhu
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 311121, China
| | - Pengfei Zhang
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
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32
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Karlinskii BY, Ananikov VP. Catalytic C-H Functionalization of Unreactive Furan Cores in Bio-Derived Platform Chemicals. CHEMSUSCHEM 2021; 14:558-568. [PMID: 33207076 DOI: 10.1002/cssc.202002397] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/17/2020] [Indexed: 06/11/2023]
Abstract
C-H functionalization is one of the most convenient and powerful tools in the arsenal of modern chemistry, deservedly nominated as the "Holy Grail" of organic synthesis. A frequent disadvantage of this method is the need for harsh reaction conditions to carry out transformations of inert C-H bonds, which limits the possibility of its use for modifying less stable substrates. Biomass-derived furan platform chemicals, which have a relatively unstable aromatic furan core and highly reactive side chain substituents, are extremely promising and valuable organic molecules that are currently widely used in a variety of research and industrial fields. The high sensitivity of furan derivatives to acids, strong oxidants, and high temperatures significantly limits the use of classical methods of C-H functionalization for their modification. New methods of catalytic functionalization of non-reactive furan cores are urgently required to obtain a new generation of materials with controlled properties and potentially bioactive substances.
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Affiliation(s)
- Bogdan Y Karlinskii
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospekt 47, Moscow, 119991, Russia
| | - Valentine P Ananikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospekt 47, Moscow, 119991, Russia
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33
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Bam R, Pollatos AS, Moser AJ, West JG. Mild olefin formation via bio-inspired vitamin B 12 photocatalysis. Chem Sci 2020; 12:1736-1744. [PMID: 34163933 PMCID: PMC8179286 DOI: 10.1039/d0sc05925k] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Dehydrohalogenation, or elimination of hydrogen-halide equivalents, remains one of the simplest methods for the installation of the biologically-important olefin functionality. However, this transformation often requires harsh, strongly-basic conditions, rare noble metals, or both, limiting its applicability in the synthesis of complex molecules. Nature has pursued a complementary approach in the novel vitamin B12-dependent photoreceptor CarH, where photolysis of a cobalt–carbon bond leads to selective olefin formation under mild, physiologically-relevant conditions. Herein we report a light-driven B12-based catalytic system that leverages this reactivity to convert alkyl electrophiles to olefins under incredibly mild conditions using only earth abundant elements. Further, this process exhibits a high level of regioselectivity, producing terminal olefins in moderate to excellent yield and exceptional selectivity. Finally, we are able to access a hitherto-unknown transformation, remote elimination, using two cobalt catalysts in tandem to produce subterminal olefins with excellent regioselectivity. Together, we show vitamin B12 to be a powerful platform for developing mild olefin-forming reactions. Terminal or subterminal olefins can be selectively formed from alkyl electrophiles via bio-inspired vitamin B12 photocatalysis.![]()
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Affiliation(s)
- Radha Bam
- Department of Chemistry, Rice University 6500 Main St Houston TX USA .westchem.org
| | | | - Austin J Moser
- Department of Chemistry, Rice University 6500 Main St Houston TX USA .westchem.org
| | - Julian G West
- Department of Chemistry, Rice University 6500 Main St Houston TX USA .westchem.org
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Barday M, Blieck R, Ruyet L, Besset T. Remote trifluoromethylthiolation of alcohols under visible light. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131153] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Zhang Y, Lin Z, Ackermann L. Electrochemical C-H Amidation of Heteroarenes with N-Alkyl Sulfonamides in Aqueous Medium. Chemistry 2020; 27:242-246. [PMID: 33085807 PMCID: PMC7898600 DOI: 10.1002/chem.202004229] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/20/2020] [Indexed: 12/12/2022]
Abstract
The construction of C-N bonds by free radical reactions represents a powerful synthetic approach for direct C-H amidations of arenes or heteroarenes. Developing efficient and more environmentally friendly synthetic methods for C-H amidation reactions remains highly desirable. Herein, metal-free electrochemical oxidative dehydrogenative C-H amidations of heteroarenes with N-alkylsulfonamides have been accomplished. The catalyst- and chemical-oxidant-free C-H amidation features an ample scope and employs electricity as the green and sole oxidant. A variety of heteroarenes, including indoles, pyrroles, benzofuran and benzothiophene, thereby underwent this C(sp2 )-H nitrogenation. Cyclic voltammetry studies and control experiments provided evidence for nitrogen-centered radicals being directly generated under metal-free electrocatalysis.
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Affiliation(s)
- Yan Zhang
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstrasse 2, 37077, Göttingen, Germany.,Key Laboratory of the Ministry of Education for Advanced, Catalysis Materials, Zhejiang Normal University, Yingbin Road 688, 321004, Jinhua, P. R. China
| | - Zhipeng Lin
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstrasse 2, 37077, Göttingen, Germany
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstrasse 2, 37077, Göttingen, Germany
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36
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Sarkar S, Cheung KPS, Gevorgyan V. C-H functionalization reactions enabled by hydrogen atom transfer to carbon-centered radicals. Chem Sci 2020; 11:12974-12993. [PMID: 34123240 PMCID: PMC8163321 DOI: 10.1039/d0sc04881j] [Citation(s) in RCA: 139] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 11/14/2020] [Indexed: 12/12/2022] Open
Abstract
Selective functionalization of ubiquitous unactivated C-H bonds is a continuous quest for synthetic organic chemists. In addition to transition metal catalysis, which typically operates under a two-electron manifold, a recent renaissance in the radical approach relying on the hydrogen atom transfer (HAT) process has led to tremendous growth in the area. Despite several challenges, protocols proceeding via HAT are highly sought after as they allow for relatively easy activation of inert C-H bonds under mild conditions leading to a broader scope and higher functional group tolerance and sometimes complementary reactivity over methods relying on traditional transition metal catalysis. A number of methods operating via heteroatom-based HAT have been extensively reported over the past few years, while methods employing more challenging carbon analogues have been less explored. Recent developments of mild methodologies for generation of various carbon-centered radical species enabled their utilization in the HAT process, which, in turn, led to the development of remote C(sp3)-H functionalization reactions of alcohols, amines, amides and related compounds. This review covers mostly recent advances in C-H functionalization reactions involving the HAT step to carbon-centered radicals.
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Affiliation(s)
- Sumon Sarkar
- Department of Chemistry and Biochemistry, University of Texas at Dallas 800 W Campbell Rd Richardson Texas 75080 USA
| | - Kelvin Pak Shing Cheung
- Department of Chemistry and Biochemistry, University of Texas at Dallas 800 W Campbell Rd Richardson Texas 75080 USA
| | - Vladimir Gevorgyan
- Department of Chemistry and Biochemistry, University of Texas at Dallas 800 W Campbell Rd Richardson Texas 75080 USA
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37
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Buzzetti L, Puriņš M, Greenwood PDG, Waser J. Enantioselective Carboetherification/Hydrogenation for the Synthesis of Amino Alcohols via a Catalytically Formed Chiral Auxiliary. J Am Chem Soc 2020; 142:17334-17339. [PMID: 33006890 PMCID: PMC7564104 DOI: 10.1021/jacs.0c09177] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
![]()
Chiral auxiliaries
and asymmetric catalysis are the workhorses
of enantioselective transformations, but they still remain limited
in terms of either efficiency or generality. Herein, we present an
alternative strategy for controlling the stereoselectivity of chemical
reactions. Asymmetric catalysis is used to install a transient chiral
auxiliary starting from achiral precursors, which then directs diastereoselective
reactions. We apply this strategy to a palladium-catalyzed carboetherification/hydrogenation
sequence on propargylic amines, providing fast access to enantioenriched
chiral amino alcohols, important building blocks for medicinal chemistry
and drug discovery. All stereoisomers of the product could be accessed
by the choice of ligand and substituent on the propargylic amine,
leading to a stereodivergent process.
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Affiliation(s)
- Luca Buzzetti
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
| | - Mikus Puriņš
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
| | - Phillip D G Greenwood
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland
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38
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Lichtenberg C. Main-Group Metal Complexes in Selective Bond Formations Through Radical Pathways. Chemistry 2020; 26:9674-9687. [PMID: 32048770 PMCID: PMC7496981 DOI: 10.1002/chem.202000194] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/10/2020] [Indexed: 12/21/2022]
Abstract
Recent years have witnessed remarkable advances in radical reactions involving main-group metal complexes. This includes the isolation and detailed characterization of main-group metal radical compounds, but also the generation of highly reactive persistent or transient radical species. A rich arsenal of methods has been established that allows control over and exploitation of their unusual reactivity patterns. Thus, main-group metal compounds have entered the field of selective bond formations in controlled radical reactions. Transformations that used to be the domain of late transition-metal compounds have been realized, and unusual selectivities, high activities, as well as remarkable functional-group tolerances have been reported. Recent findings demonstrate the potential of main-group metal compounds to become standard tools of synthetic chemistry, catalysis, and materials science, when operating through radical pathways.
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Affiliation(s)
- Crispin Lichtenberg
- Institute of Inorganic ChemistryJulius-Maximilians-University WürzburgAm Hubland97074WürzburgGermany
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39
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Karjee P, Sarkar T, Kar S, Punniyamurthy T. Transition-Metal-Free Stereospecific Oxidative Annulative Coupling of Indolines with Aziridines. J Org Chem 2020; 85:8261-8270. [PMID: 32468818 DOI: 10.1021/acs.joc.0c00899] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Tandem C-N bond formation for the oxidative annulation of indolines with aziridines is accomplished employing the combination of DDQ and NaOCl at ambient conditions. Optically active aziridine can be coupled with high enantiomeric purity (>99% ee). The substrate scope, stereocontrol with the enantioenriched substrate, and scale-up are the important practical advantages.
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Affiliation(s)
- Pallab Karjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Tanumay Sarkar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Subhradeep Kar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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40
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Wang C, Yu Y, Liu WL, Duan WL. Site-Tunable Csp3–H Bonds Functionalization by Visible-Light-Induced Radical Translocation of N-Alkoxyphthalimides. Org Lett 2019; 21:9147-9152. [DOI: 10.1021/acs.orglett.9b03524] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Chuanyong Wang
- College of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Road, Yangzhou 225002, China
| | - Yangyang Yu
- College of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Road, Yangzhou 225002, China
| | - Wen-Long Liu
- College of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Road, Yangzhou 225002, China
| | - Wei-Liang Duan
- College of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Road, Yangzhou 225002, China
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41
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Shu W, Zhang H, Huang Y. γ-Alkylation of Alcohols Enabled by Visible-Light Induced 1,6-Hydrogen Atom Transfer. Org Lett 2019; 21:6107-6111. [PMID: 31339735 DOI: 10.1021/acs.orglett.9b02255] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Site-selective remote alkylation of alcohol is attractive but challenging in organic synthesis. Herein, we report a novel visible-light mediated γ-alkylation of alcohol derivatives via the formation of Csp3-Csp3 bond through Csp3-H bond functionalization under mild conditions. The use of sulfamate esters enables the directed, otherwise rare 1,6-HAT to generate γ-selective C-centered radical, which is complementary to δ-selective 1,5-HAT of alcohols. This redox-neutral protocol provides a general and operationally simple method to access γ-alkylated alcohols.
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Affiliation(s)
- Wei Shu
- Department of Chemistry and Shenzhen Grubbs Institute , Southern University of Science and Technology , 518055 , Shenzhen , Guangdong , China.,State Key Laboratory of Elemento-Organic Chemistry , Nankai University , 300071 , Tianjin , China
| | - Hui Zhang
- Department of Chemistry and Shenzhen Grubbs Institute , Southern University of Science and Technology , 518055 , Shenzhen , Guangdong , China
| | - Yan Huang
- Department of Chemistry and Shenzhen Grubbs Institute , Southern University of Science and Technology , 518055 , Shenzhen , Guangdong , China
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42
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Kiyokawa K, Nakamura S, Jou K, Iwaida K, Minakata S. Transition-metal-free Intramolecular C–H amination of sulfamate esters and N-alkylsulfamides. Chem Commun (Camb) 2019; 55:11782-11785. [DOI: 10.1039/c9cc06410a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The transition-metal-free intramolecular C–H amination of sulfamate esters and N-alkylsulfamides using iodine oxidants, tert-butyl hypoiodite (t-BuOI) and N-iodosuccinimide (NIS) is reported.
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Affiliation(s)
- Kensuke Kiyokawa
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Shogo Nakamura
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Keisuke Jou
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Kohji Iwaida
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Satoshi Minakata
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
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