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Bhatt D, Miyake K, Nakamura S, Kim HY, Oh K. Photoredox-Catalyzed 1,4-Peroxidation-Sulfonylation of Enynones: A Three-Component Radical Coupling Approach for the Synthesis of Highly Functionalized Allenes. Org Lett 2024; 26:2955-2959. [PMID: 38567894 DOI: 10.1021/acs.orglett.4c00517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
An Eosin Y-catalyzed visible light-promoted 1,4-peroxidation-sulfonylation of enynones was achieved to give tetrasubstituted allenes. The photoredox catalysis of Eosin Y allowed the concomitant formation of peroxy and sulfonyl radicals, where the preferential peroxy radical addition to the alkene moiety of enynones resulted in the subsequent α-keto radical-sulfonyl radical cross couplings. The developed photoredox catalysis of Eosin Y demonstrates a regioselective 1,4-diradical addition strategy, opening up a new possibility of diradical functionalization of conjugate systems.
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Affiliation(s)
- Divya Bhatt
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul, 06974, Republic of Korea
| | - Kosei Miyake
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Shuichi Nakamura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Hun Young Kim
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul, 06974, Republic of Korea
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Bhatt D, Kim HY, Oh K. Chemodivergent Sulfonylation of Enynones via Ionic and Radical Addition Modes of Sulfinic Acids. Org Lett 2023. [PMID: 37494288 DOI: 10.1021/acs.orglett.3c02218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Different addition modes of sulfinic acids were developed for the chemodivergent sulfonylation of enynones, where the ionic sulfonylation to an alkyne moiety of enynones was effected through a salt-controlled syn-addition pathway. The radical sulfonylation of an alkene moiety also provided the stereodefined sulfonylated alkenes. A one-pot tandem sequence of the Ti(Oi-Pr)4-catalyzed α-vinyl aldol condensation of (E)-β-chlorovinyl ketones followed by the chemodivergent sulfonylations was also explored, allowing for ready access to highly substituted dienes and enynes.
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Affiliation(s)
- Divya Bhatt
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Hun Young Kim
- Department of Global Innovative Drugs, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
| | - Kyungsoo Oh
- Center for Metareceptome Research, Graduate School of Pharmaceutical Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 06974, Republic of Korea
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Renzi P, Azzi E, Ascensio S, Parisotto S, Sordello F, Pellegrino F, Ghigo G, Deagostino A. Inexpensive and bench stable diarylmethylium tetrafluoroborates as organocatalysts in the light mediated hydrosulfonylation of unactivated alkenes. Chem Sci 2023; 14:2721-2734. [PMID: 36908942 PMCID: PMC9993860 DOI: 10.1039/d3sc00182b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 02/10/2023] [Indexed: 02/12/2023] Open
Abstract
In this paper, we present the synthetic potential of diarylmethylium tetrafluoroborates as catalysts for the visible light promoted hydrosulfonylation of unactivated alkenes. For the first time, these salts, which are bench stable and easily preparable on a multi-gram scale, were employed as organocatalysts. Interestingly, a catalyst loading of only 1 mol% allowed sulfone products to be efficiently obtained from good-to-excellent yields with high functional-group tolerance and scalability up to 15 mmol of alkene. The mechanistic study, both experimental and computational, presented here, revealed an alternative mechanism for the formation of the key sulfonyl radical. Indeed, the photoactive species was proved not to be the diarylcarbenium salt itself, but two intermediates, a stable S-C adduct and an ion couple, that were formed after its interaction with sodium benzenesulfinate. Upon absorbing light, the ion couple could reach an excited state with a charge-transfer character which gave the fundamental sulfonyl radical. A PCET (proton-coupled electron transfer) closes the catalytic cycle reforming the diarylcarbenium salt.
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Affiliation(s)
- Polyssena Renzi
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Emanuele Azzi
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Sylvain Ascensio
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Stefano Parisotto
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Fabrizio Sordello
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Francesco Pellegrino
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Giovanni Ghigo
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
| | - Annamaria Deagostino
- Department of Chemistry, University of Torino Via Pietro Giuria, 7 10125 Torino Italy
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Almendros P, Esteban P, Herrera F, San Martín D, Luna A. Regioselectivity Switch Based on the Stoichiometry: Stereoselective Synthesis of Trisubstituted Vinyl Epoxides by Cu‐Catalyzed 3‐exo‐trig Cyclization of α‐Allenols. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200592] [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]
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Nova-Fernández JL, García MJ, Mollari L, Pascual-Coca G, Cabrera S, Alemán J. Continuous-flow synthesis of alkyl zinc sulfinates for the direct photofunctionalization of heterocycles. Chem Commun (Camb) 2022; 58:4611-4614. [PMID: 35315862 DOI: 10.1039/d2cc01065h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A sustainable strategy for the alkylation of heterocycles is presented. The protocol relies on the in situ generation and further in-line use of alkyl zinc sulfinates through a continuous-flow system. The environmentally friendly character of the protocol is assured by the use of a green solvent mixture, the presence of a metal free oxidant and low waste generation.
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Affiliation(s)
- José Luis Nova-Fernández
- Organic Chemistry Department, M1, Universidad Autónoma de Madrid, 28049, Madrid, Spain. .,Synthelia Organics Labs, C/Faraday, 7, Labs 2.05 and 0.03, Parque Científico de Madrid, 28049, Madrid, Spain
| | - Montaña J García
- Organic Chemistry Department, M1, Universidad Autónoma de Madrid, 28049, Madrid, Spain.
| | - Leonardo Mollari
- Organic Chemistry Department, M1, Universidad Autónoma de Madrid, 28049, Madrid, Spain.
| | - Gustavo Pascual-Coca
- Synthelia Organics Labs, C/Faraday, 7, Labs 2.05 and 0.03, Parque Científico de Madrid, 28049, Madrid, Spain
| | - Silvia Cabrera
- Inorganic Chemistry Department, M7, Universidad Autónoma de Madrid, 28049, Madrid, Spain. .,Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Center for Innovation in Advanced Chemistry (ORFEO-CINQA), Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - José Alemán
- Organic Chemistry Department, M1, Universidad Autónoma de Madrid, 28049, Madrid, Spain. .,Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Center for Innovation in Advanced Chemistry (ORFEO-CINQA), Universidad Autónoma de Madrid, 28049, Madrid, Spain
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