Abstract
A metal free and highly stereoselective procedure for the synthesis of 2,3-unsaturated-C-glycosides has been developed between glycals and unactivated aryl acetylenes in the presence of TMSOTf through a triflated C-vinyl glycosides intermediate. The flexibility of the procedure was tested by a wide variety of glycals and unactivated aryl acetylenes (20 examples). The corresponding alkynyl C-glycosides were obtained in good yields with completely α-selectivity in a short time (<25 min). And a plausible mechanism for the synthesis of alkynyl C-glycosides was depicted.
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Acknowledgments
This project was financially supported by Natural Science Foundation of Shanghai (11ZR1410400), “DAXIA” Foundation of East China Normal University (No. 2011DX-288) National Students Innovative Experimental Projects (No. 1310269021) and large instruments Open Foundation of East China Normal University (2014-03&20151043).
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Chen, H., Luo, X., Qiu, S. et al. TMSOTf mediated stereoselective synthesis of α-C-glycosides from unactivated aryl acetylenes. Glycoconj J 34, 13–20 (2017). https://doi.org/10.1007/s10719-016-9718-7
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DOI: https://doi.org/10.1007/s10719-016-9718-7