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Wang H, Wang S, George V, Llorente G, König B. Photo‐Induced Homologation of Carbonyl Compounds for Iterative Syntheses. Angew Chem Int Ed Engl 2022; 61:e202211578. [PMID: 36226924 PMCID: PMC10099875 DOI: 10.1002/anie.202211578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Indexed: 11/12/2022]
Abstract
We describe a photo-induced reaction for the in situ generation of highly reactive alkyl diazo species from carbonyl precursors via photo-excitation of N-tosylhydrazone anions. The diazo intermediates undergo efficient C-H insertion of aldehydes, leading to the productive synthesis of aldehydes and ketones. The method is applicable to the iterative synthesis of densely functionalized carbonyl compounds through sequential trapping of the diazo species with various aldehydes. The reaction proceeds without the need of any catalyst by light irradiation and features high functional group tolerance. More than 70 examples, some performed on a gram-scale, demonstrate the broad applicability of this reaction sequence in synthesis.
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Affiliation(s)
- Hua Wang
- Faculty of Chemistry and Pharmacy University Regensburg 93040 Regensburg Germany
- Department of Chemistry, School of Pharmacy The Fourth Military Medical University Xi'an 710032 P. R. China
| | - Shun Wang
- Faculty of Chemistry and Pharmacy University Regensburg 93040 Regensburg Germany
| | - Vincent George
- Faculty of Chemistry and Pharmacy University Regensburg 93040 Regensburg Germany
| | - Galder Llorente
- Faculty of Chemistry and Pharmacy University Regensburg 93040 Regensburg Germany
| | - Burkhard König
- Faculty of Chemistry and Pharmacy University Regensburg 93040 Regensburg Germany
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Zhang Y, Zhou G, Gong X, Guo Z, Qi X, Shen X. Diastereoselective Transfer of Tri(di)fluoroacetylsilanes-Derived Carbenes to Alkenes. Angew Chem Int Ed Engl 2022; 61:e202202175. [PMID: 35415937 DOI: 10.1002/anie.202202175] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Indexed: 01/04/2023]
Abstract
Stereoselective cyclopropanation reaction of alkenes is usually achieved by metal complexes via singlet-metal-carbene intermediates. However, previous transition-metal-catalyzed cyclopropanation of alkenes with acylsilanes afforded low diastereoselectivity. Herein, we report the first visible-light-induced transition-metal-free cyclopropanation reaction of terminal alkenes with trifluoroacetylsilanes and difluoroacetylsilanes. Both aromatic and aliphatic alkenes as well as electron-deficient alkenes are suitable substrates for the highly cis-selective [2+1] cyclization reaction. A combination of experimental and computational studies identified triplet carbenes as being key intermediates in this transformation. The gram scale reaction and late-stage functionalization demonstrated the synthetic potential of this strategy.
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Affiliation(s)
- Yizhi Zhang
- Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Gang Zhou
- Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Xingxing Gong
- Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Zhuanzhuan Guo
- Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Xiaotian Qi
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Xiao Shen
- Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
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Zhang Y, Zhou G, Gong X, Guo Z, Qi X, Shen X. Diastereoselective Transfer of Tri(di)fluoroacetylsilanes‐Derived Carbenes to Alkenes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202202175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yizhi Zhang
- Institute for Advanced Studies Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education Wuhan University 299 Bayi Road Wuhan Hubei 430072 China
| | - Gang Zhou
- Institute for Advanced Studies Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education Wuhan University 299 Bayi Road Wuhan Hubei 430072 China
| | - Xingxing Gong
- Institute for Advanced Studies Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education Wuhan University 299 Bayi Road Wuhan Hubei 430072 China
| | - Zhuanzhuan Guo
- Institute for Advanced Studies Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education Wuhan University 299 Bayi Road Wuhan Hubei 430072 China
| | - Xiaotian Qi
- Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education College of Chemistry and Molecular Sciences Wuhan University 299 Bayi Road Wuhan Hubei 430072 China
| | - Xiao Shen
- Institute for Advanced Studies Engineering Research Center of Organosilicon Compounds & Materials Ministry of Education Wuhan University 299 Bayi Road Wuhan Hubei 430072 China
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Li F, Pei C, Koenigs RM. Photokatalytische gem‐Difluorolefinierungsreaktionen durch eine formale C−C‐Kupplungs/Defluorierungsreaktion mit Diazoacetaten. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fang Li
- RWTH Aachen University Institute of Organic Chemistry Landoltweg 1 52074 Aachen Deutschland
| | - Chao Pei
- RWTH Aachen University Institute of Organic Chemistry Landoltweg 1 52074 Aachen Deutschland
| | - Rene M. Koenigs
- RWTH Aachen University Institute of Organic Chemistry Landoltweg 1 52074 Aachen Deutschland
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Li F, Pei C, Koenigs RM. Photocatalytic gem-Difluoroolefination Reactions by a Formal C-C Coupling/Defluorination Reaction with Diazoacetates. Angew Chem Int Ed Engl 2021; 61:e202111892. [PMID: 34716734 PMCID: PMC9300101 DOI: 10.1002/anie.202111892] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Indexed: 12/23/2022]
Abstract
The photolysis of diazoalkanes to conduct singlet carbene transfer reactions of colored diazoalkanes has recently attracted significant interest in organic synthesis. Herein, we describe a photocatalytic approach that allows the access of triplet carbene intermediates via energy transfer to conduct highly efficient gem‐difluoroolefination reactions with α‐trifluoromethyl styrenes. The use of a tertiary amines proved pivotal to unlock this unusual reaction pathway and to prevent undesired cyclopropanation pathways. The amine further facilitates the ultimate abstraction of fluoride to yield gem‐difluoroolefins (43 examples, up to 88 % yield), which is supported by experimental and theoretical mechanistic studies. We explored this synthesis method with a broad substrate scope, ranging from simple olefins and heterocyclic olefins towards the decoration of pharmaceutically relevant building blocks.
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Affiliation(s)
- Fang Li
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074, Aachen, Germany
| | - Chao Pei
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074, Aachen, Germany
| | - Rene M Koenigs
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074, Aachen, Germany
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Wang K, Liu Z, Xu G, Shao Y, Tang S, Chen P, Zhang X, Sun J. Chemo‐ and Enantioselective Insertion of Furyl Carbene into the N−H Bond of 2‐Pyridones. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104708] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Kai Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road 213164 Changzhou China
| | - Ziye Liu
- Shenzhen Bay Laboratory State Key Laboratory of Chemical Oncogeomics Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Guangyang Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road 213164 Changzhou China
| | - Ying Shao
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road 213164 Changzhou China
| | - Shengbiao Tang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road 213164 Changzhou China
| | - Ping Chen
- Shenzhen Jingtai Technology Co., Ltd. (XtalPi) Shenzhen 518000 China
| | - Xinhao Zhang
- Shenzhen Bay Laboratory State Key Laboratory of Chemical Oncogeomics Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Jiangtao Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road 213164 Changzhou China
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Wang K, Liu Z, Xu G, Shao Y, Tang S, Chen P, Zhang X, Sun J. Chemo- and Enantioselective Insertion of Furyl Carbene into the N-H Bond of 2-Pyridones. Angew Chem Int Ed Engl 2021; 60:16942-16946. [PMID: 34038015 DOI: 10.1002/anie.202104708] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/13/2021] [Indexed: 01/09/2023]
Abstract
Asymmetric carbene insertion reactions represent one of the most important protocols to construct carbon-heteroatom bonds. The use of donor-acceptor diazo compounds bearing an ester group is however a prerequisite for achieving high enantioselectivity. Herein, we report a chemo- and enantioselective formal N-H insertion of 2-pyridones that has been accomplished for the first time with enynones as the donor-donor carbene precursors. DFT calculations indicate an unprecedented enantioselective 1,4-proton transfer from O to C. The rhodium catalyst provides a chiral pocket in which the steric repulsion and the π-π interaction of the propeller ligand play a critical role in determining the selectivities.
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Affiliation(s)
- Kai Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, 1 Gehu Road, 213164, Changzhou, China
| | - Ziye Liu
- Shenzhen Bay Laboratory, State Key Laboratory of Chemical Oncogeomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Guangyang Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, 1 Gehu Road, 213164, Changzhou, China
| | - Ying Shao
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, 1 Gehu Road, 213164, Changzhou, China
| | - Shengbiao Tang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, 1 Gehu Road, 213164, Changzhou, China
| | - Ping Chen
- Shenzhen Jingtai Technology Co., Ltd. (XtalPi), Shenzhen, 518000, China
| | - Xinhao Zhang
- Shenzhen Bay Laboratory, State Key Laboratory of Chemical Oncogeomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Jiangtao Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, 1 Gehu Road, 213164, Changzhou, China
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