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Anti-Markovnikov ring-opening of sulfonium salts with alkynes by visible light/copper catalysis

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Abstract

Internal alkynes are widespread skeletons in bioactive molecules and materials which are also used as important building blocks in chemical synthesis. Herein, we report a novel and efficient copper-catalyzed Sonogashira reaction between sulfonium salts and alkynes through an anti-Markovnikov ring-opening pathway promoted by visible light. The coexistence of the nitrogen and phosphorus ligands in the system is the key to the success of this reaction. This radical type ring-opening reaction affords a new strategy for the synthesis of internal alkynes. Furthermore, this study is also an effective complement to the diverse reaction patterns of sulfonium salts.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (22271170) and the Scientific Research Foundation of Qingdao University of Science and Technology (1203043003457).

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Correspondence to Daoshan Yang.

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Supporting information The supporting information is available online at https://chem.scichina.com and https://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Li, X., Jiang, M., Zuo, J. et al. Anti-Markovnikov ring-opening of sulfonium salts with alkynes by visible light/copper catalysis. Sci. China Chem. 66, 791–798 (2023). https://doi.org/10.1007/s11426-022-1373-y

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