151
|
Lin L, Bai X, Ye X, Zhao X, Tan CH, Jiang Z. Organocatalytic Enantioselective Protonation for Photoreduction of Activated Ketones and Ketimines Induced by Visible Light. Angew Chem Int Ed Engl 2017; 56:13842-13846. [PMID: 28925022 DOI: 10.1002/anie.201707899] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/04/2017] [Indexed: 12/23/2022]
Abstract
The first catalytic asymmetric photoreduction of 1,2-diketones and α-keto ketimines under visible light irradiation is reported. A transition-metal-free synergistic catalysis platform harnessing dicyanopyrazine-derived chromophore (DPZ) as the photoredox catalyst and a non-covalent chiral organocatalyst is effective for these transformations. With the flexible use of a chiral Brønsted acid or base in H+ transfer interchange to control the elusive enantioselective protonation, a variety of chiral α-hydroxy ketones and α-amino ketones were obtained with high yields and enantioselectivities.
Collapse
Affiliation(s)
- Lu Lin
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P.R. China
| | - Xiangbin Bai
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P.R. China
| | - Xinyi Ye
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Xiaowei Zhao
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P.R. China
| | - Choon-Hong Tan
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Zhiyong Jiang
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P.R. China
| |
Collapse
|
152
|
Borra S, Chandrasekhar D, Khound S, Maurya RA. Access to 1a,6b-Dihydro-1H-benzofuro[2,3-b]azirines and Benzofuran-2-amines via Visible Light Triggered Decomposition of α-Azidochalcones. Org Lett 2017; 19:5364-5367. [DOI: 10.1021/acs.orglett.7b02643] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Satheesh Borra
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat, Assam-785006, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-NEIST Jorhat, Assam-785006, India
| | - D. Chandrasekhar
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat, Assam-785006, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-NEIST Jorhat, Assam-785006, India
| | - Susmita Khound
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat, Assam-785006, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-NEIST Jorhat, Assam-785006, India
| | - Ram Awatar Maurya
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat, Assam-785006, India
- Academy
of Scientific and Innovative Research (AcSIR), CSIR-NEIST Jorhat, Assam-785006, India
| |
Collapse
|
153
|
Yang C, Zhang W, Li YH, Xue XS, Li X, Cheng JP. Origin of Stereoselectivity of the Photoinduced Asymmetric Phase-Transfer-Catalyzed Perfluoroalkylation of β-Ketoesters. J Org Chem 2017; 82:9321-9327. [DOI: 10.1021/acs.joc.7b01130] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chen Yang
- State
Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P.R. China
- Department
of Chemistry and Biology, College of Science, National University of Defense Technology, Changsha 410073, China
| | - Wei Zhang
- State
Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P.R. China
| | - Yi-He Li
- Department
of Chemistry and Biology, College of Science, National University of Defense Technology, Changsha 410073, China
| | - Xiao-Song Xue
- State
Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P.R. China
| | - Xin Li
- State
Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P.R. China
| | - Jin-Pei Cheng
- State
Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, P.R. China
- Department
of Chemistry and Biology, College of Science, National University of Defense Technology, Changsha 410073, China
| |
Collapse
|
154
|
Hu RB, Sun S, Su Y. Visible-Light-Induced Carbo-2-pyridylation of Electron-Deficient Alkenes with Pyridinium Salts. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704385] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Rong-Bin Hu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P.R. China
| | - Shuai Sun
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P.R. China
| | - Yijin Su
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P.R. China
| |
Collapse
|
155
|
Hu RB, Sun S, Su Y. Visible-Light-Induced Carbo-2-pyridylation of Electron-Deficient Alkenes with Pyridinium Salts. Angew Chem Int Ed Engl 2017; 56:10877-10880. [DOI: 10.1002/anie.201704385] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 06/05/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Rong-Bin Hu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P.R. China
| | - Shuai Sun
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P.R. China
| | - Yijin Su
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P.R. China
| |
Collapse
|
156
|
Liu YY, Yu XY, Chen JR, Qiao MM, Qi X, Shi DQ, Xiao WJ. Visible-Light-Driven Aza-ortho
-quinone Methide Generation for the Synthesis of Indoles in a Multicomponent Reaction. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704690] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yi-Yin Liu
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Xiao-Ye Yu
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Jia-Rong Chen
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Ming-Ming Qiao
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Xiaotian Qi
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - De-Qing Shi
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Wen-Jing Xiao
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; 345 Lingling Road Shanghai 200032 China
| |
Collapse
|
157
|
Kärkäs MD. Photochemical Generation of Nitrogen-Centered Amidyl, Hydrazonyl, and Imidyl Radicals: Methodology Developments and Catalytic Applications. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01385] [Citation(s) in RCA: 280] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Markus D. Kärkäs
- Department of Organic Chemistry,
Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| |
Collapse
|
158
|
Liu YY, Yu XY, Chen JR, Qiao MM, Qi X, Shi DQ, Xiao WJ. Visible-Light-Driven Aza-ortho
-quinone Methide Generation for the Synthesis of Indoles in a Multicomponent Reaction. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/anie.201704690] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yi-Yin Liu
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Xiao-Ye Yu
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Jia-Rong Chen
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Ming-Ming Qiao
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Xiaotian Qi
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - De-Qing Shi
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
| | - Wen-Jing Xiao
- CCNU-uOttawa Joint Research Centre; Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis; Key Laboratory of Pesticides & Chemical Biology Ministry of Education; College of Chemistry; Central China Normal University; 152 Luoyu Road Wuhan Hubei 430079 China
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; 345 Lingling Road Shanghai 200032 China
| |
Collapse
|
159
|
Affiliation(s)
- Yuhua Liu
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou Guangdong 510006 China
| | - Wen Dong
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou Guangdong 510006 China
| |
Collapse
|
160
|
Cano R, Zakarian A, McGlacken GP. Direct Asymmetric Alkylation of Ketones: Still Unconquered. Angew Chem Int Ed Engl 2017; 56:9278-9290. [PMID: 28497890 DOI: 10.1002/anie.201703079] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 04/27/2017] [Indexed: 01/07/2023]
Abstract
The alkylation of ketones is taught at basic undergraduate level. In many cases this transformation leads to the formation of a new stereogenic center. However, the apparent simplicity of the transformation is belied by a number of problems. So much so, that a general method for the direct asymmetric alkylation of ketones remains an unmet target. Despite the advancement of organocatalysis and transition-metal catalysis, neither field has provided an adequate solution. Indeed, even use of an efficient and general stoichiometric chiral reagent has yet to be reported. Herein we describe the state-of-the-art in terms of direct alkylation reactions of some carbonyl groups. We outline the limited progress that has been made with ketones, and potential routes towards ultimately achieving a widely applicable methodology for the asymmetric alkylation of ketones.
Collapse
Affiliation(s)
- Rafael Cano
- Department of Chemistry, University College Cork, Cork, Ireland.,Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| | - Armen Zakarian
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Gerard P McGlacken
- Department of Chemistry, University College Cork, Cork, Ireland.,Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| |
Collapse
|
161
|
Cano R, Zakarian A, McGlacken GP. Direkte asymmetrische Alkylierung von Ketonen: noch immer ein unerreichtes Ziel. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703079] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Rafael Cano
- Department of Chemistry; University College Cork; Cork Irland
- Analytical and Biological Chemistry Research Facility; University College Cork; Cork Irland
| | - Armen Zakarian
- Department of Chemistry and Biochemistry; University of California; Santa Barbara CA 93106 USA
| | - Gerard P. McGlacken
- Department of Chemistry; University College Cork; Cork Irland
- Analytical and Biological Chemistry Research Facility; University College Cork; Cork Irland
| |
Collapse
|
162
|
Yang S, Li P, Wang Z, Wang L. Photoinduced Oxidative Formylation of N,N-Dimethylanilines with Molecular Oxygen without External Photocatalyst. Org Lett 2017. [DOI: 10.1021/acs.orglett.7b01230] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shuai Yang
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Pinhua Li
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Zhihui Wang
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
| | - Lei Wang
- Department
of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, P. R. China
| |
Collapse
|
163
|
Saito M, Kobayashi Y, Tsuzuki S, Takemoto Y. Electrophilic Activation of Iodonium Ylides by Halogen-Bond-Donor Catalysis for Cross-Enolate Coupling. Angew Chem Int Ed Engl 2017; 56:7653-7657. [DOI: 10.1002/anie.201703641] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Masato Saito
- Graduate School of Pharmaceutical Sciences; Kyoto University, Yoshida, Sakyo-ku; Kyoto 606-8501 Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences; Kyoto University, Yoshida, Sakyo-ku; Kyoto 606-8501 Japan
| | - Seiji Tsuzuki
- Research Initiative of Computational Sciences (RICS); Nanosystem Research Institute (NRI); National Institute of Advanced Industrial Science and Technology (AIST); 1-1-1 Umezono Tsukuba Ibaraki 3 05-8568 Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences; Kyoto University, Yoshida, Sakyo-ku; Kyoto 606-8501 Japan
| |
Collapse
|
164
|
Saito M, Kobayashi Y, Tsuzuki S, Takemoto Y. Electrophilic Activation of Iodonium Ylides by Halogen-Bond-Donor Catalysis for Cross-Enolate Coupling. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703641] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Masato Saito
- Graduate School of Pharmaceutical Sciences; Kyoto University, Yoshida, Sakyo-ku; Kyoto 606-8501 Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences; Kyoto University, Yoshida, Sakyo-ku; Kyoto 606-8501 Japan
| | - Seiji Tsuzuki
- Research Initiative of Computational Sciences (RICS); Nanosystem Research Institute (NRI); National Institute of Advanced Industrial Science and Technology (AIST); 1-1-1 Umezono Tsukuba Ibaraki 3 05-8568 Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences; Kyoto University, Yoshida, Sakyo-ku; Kyoto 606-8501 Japan
| |
Collapse
|
165
|
Yuan X, Dong S, Liu Z, Wu G, Zou C, Ye J. Enantioselective Michael Addition of Photogenerated o-Quinodimethanes to Enones Catalyzed by Chiral Amino Acid Esters. Org Lett 2017; 19:2322-2325. [DOI: 10.1021/acs.orglett.7b00862] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Xiaoqian Yuan
- Engineering
Research Centre of Pharmaceutical Process Chemistry,
Ministry of Education; Shanghai Key Laboratory of New Drug Design,
School of Pharmacy, ‡State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Shupeng Dong
- Engineering
Research Centre of Pharmaceutical Process Chemistry,
Ministry of Education; Shanghai Key Laboratory of New Drug Design,
School of Pharmacy, ‡State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Zhen Liu
- Engineering
Research Centre of Pharmaceutical Process Chemistry,
Ministry of Education; Shanghai Key Laboratory of New Drug Design,
School of Pharmacy, ‡State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Guibing Wu
- Engineering
Research Centre of Pharmaceutical Process Chemistry,
Ministry of Education; Shanghai Key Laboratory of New Drug Design,
School of Pharmacy, ‡State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Chuncheng Zou
- Engineering
Research Centre of Pharmaceutical Process Chemistry,
Ministry of Education; Shanghai Key Laboratory of New Drug Design,
School of Pharmacy, ‡State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jinxing Ye
- Engineering
Research Centre of Pharmaceutical Process Chemistry,
Ministry of Education; Shanghai Key Laboratory of New Drug Design,
School of Pharmacy, ‡State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| |
Collapse
|
166
|
Filippini G, Silvi M, Melchiorre P. Enantioselective Formal α-Methylation and α-Benzylation of Aldehydes by Means of Photo-organocatalysis. Angew Chem Int Ed Engl 2017; 56:4447-4451. [PMID: 28323367 PMCID: PMC5396335 DOI: 10.1002/anie.201612045] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Revised: 02/16/2017] [Indexed: 11/10/2022]
Abstract
Detailed herein is the photochemical organocatalytic enantioselective α-alkylation of aldehydes with (phenylsulfonyl)alkyl iodides. The chemistry relies on the direct photoexcitation of enamines to trigger the formation of reactive carbon-centered radicals from iodosulfones, while the ground-state chiral enamines provide effective stereochemical control over the radical trapping process. The phenylsulfonyl moiety, acting as a redox auxiliary group, facilitates the generation of radicals. In addition, it can eventually be removed under mild reducing conditions to reveal methyl and benzyl groups.
Collapse
Affiliation(s)
- Giacomo Filippini
- ICIQ—Institute of Chemical Research of CataloniaThe Barcelona Institute of Science and TechnologyAvenida Països Catalans 1643007TarragonaSpain
| | - Mattia Silvi
- ICIQ—Institute of Chemical Research of CataloniaThe Barcelona Institute of Science and TechnologyAvenida Països Catalans 1643007TarragonaSpain
| | - Paolo Melchiorre
- ICREAPasseig Lluís Companys 2308010BarcelonaSpain
- ICIQ—Institute of Chemical Research of CataloniaThe Barcelona Institute of Science and TechnologyAvenida Països Catalans 1643007TarragonaSpain
| |
Collapse
|
167
|
Filippini G, Silvi M, Melchiorre P. Enantioselective Formal α-Methylation and α-Benzylation of Aldehydes by Means of Photo-organocatalysis. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612045] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Giacomo Filippini
- ICIQ-Institute of Chemical Research of Catalonia; The Barcelona Institute of Science and Technology; Avenida Països Catalans 16 43007 Tarragona Spain
| | - Mattia Silvi
- ICIQ-Institute of Chemical Research of Catalonia; The Barcelona Institute of Science and Technology; Avenida Països Catalans 16 43007 Tarragona Spain
| | - Paolo Melchiorre
- ICREA; Passeig Lluís Companys 23 08010 Barcelona Spain
- ICIQ-Institute of Chemical Research of Catalonia; The Barcelona Institute of Science and Technology; Avenida Països Catalans 16 43007 Tarragona Spain
| |
Collapse
|
168
|
Visible-light excitation of iminium ions enables the enantioselective catalytic β-alkylation of enals. Nat Chem 2017; 9:868-873. [DOI: 10.1038/nchem.2748] [Citation(s) in RCA: 197] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 02/07/2017] [Indexed: 12/21/2022]
|
169
|
Ji W, Li P, Yang S, Wang L. Visible-light-induced oxidative formylation of N-alkyl-N-(prop-2-yn-1-yl)anilines with molecular oxygen in the absence of an external photosensitizer. Chem Commun (Camb) 2017; 53:8482-8485. [DOI: 10.1039/c7cc03693k] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Visible-light-induced oxidative formylation of N-alkyl-N-(prop-2-yn-1-yl)anilines with molecular oxygen without an external photosensitizer was developed under mild reaction conditions.
Collapse
Affiliation(s)
- Wangqin Ji
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P. R. China
| | - Pinhua Li
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P. R. China
| | - Shuai Yang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P. R. China
| | - Lei Wang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P. R. China
- State Key Laboratory of Organometallic Chemistry
| |
Collapse
|
170
|
Shen Y, Cornella J, Juliá-Hernández F, Martin R. Visible-Light-Promoted Atom Transfer Radical Cyclization of Unactivated Alkyl Iodides. ACS Catal 2016. [DOI: 10.1021/acscatal.6b03205] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yangyang Shen
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Josep Cornella
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Francisco Juliá-Hernández
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Ruben Martin
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- ICREA, Passeig Lluïs Companys, 23, 08010, Barcelona, Spain
| |
Collapse
|
171
|
Böhm A, Bach T. Radical Reactions Induced by Visible Light in Dichloromethane Solutions of Hünig's Base: Synthetic Applications and Mechanistic Observations. Chemistry 2016; 22:15921-15928. [PMID: 27628907 DOI: 10.1002/chem.201603303] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Indexed: 11/07/2022]
Abstract
β-(3-Iodopropoxy)-substituted α,β-unsaturated lactams, lactones, and cycloalkenones (eight examples) underwent reductive radical reactions in a dichloromethane solution of N,N-diisopropylethylamine (Hünig's base) upon irradiation with visible light (λ=419 nm). Apart from plain reduction reactions (hydro-de-iodination), a significant degree of cyclization was observed in three cases. In parallel to the conversion of the substrates, the formation of intensely colored by-products was observed. Based on mass spectrometric evidence and upon comparison with known compounds, the by-products were identified as cyanine dyes. Their formation supports the hypothesis that irradiation of dichloromethane solutions of Hünig's base leads to the formation of radicals, which in turn can either initiate a radical reaction or combine with cyanine precursors. It was shown by deuterium-labelling experiments, that one equivalent of dichloromethane is incorporated into the cyanine dyes and that the reductive quenching of radical intermediates is at least partially due to hydrogen abstraction from the solvent. As a consequence, a reductive cyclization of the starting materials is favored in CD2 Cl2 solutions as shown for two β-(3-iodopropoxy)-substituted tetronates, which underwent in dichloromethane almost exclusive reduction, but gave predominantly the cyclization products in CD2 Cl2 .
Collapse
Affiliation(s)
- Alexander Böhm
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany.
| |
Collapse
|
172
|
Diaba F, Montiel JA, Bonjoch J. Intramolecular radical non-reductive alkylation of ketones via transient enamines. Chem Commun (Camb) 2016; 52:14031-14034. [DOI: 10.1039/c6cc08356k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A five-minute one-pot cyclization of dichloro-acetamide-tethered ketones was achieved under microwave activation through a radical procedure involving a transient enamine.
Collapse
Affiliation(s)
- Faïza Diaba
- Laboratori de Química Orgànica
- Facultat de Farmàcia
- IBUB
- Universitat de Barcelona
- 08028-Barcelona
| | - Juan A. Montiel
- Laboratori de Química Orgànica
- Facultat de Farmàcia
- IBUB
- Universitat de Barcelona
- 08028-Barcelona
| | - Josep Bonjoch
- Laboratori de Química Orgànica
- Facultat de Farmàcia
- IBUB
- Universitat de Barcelona
- 08028-Barcelona
| |
Collapse
|