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Synthesis of tetrahydrothiopyrans

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Tetrahydrothiopyrans have been efficiently synthesized in good yields with excellent diastereoselectivity from aldehydes and substituted 5-methylhex-4-ene-1-thiol via (3,5)-thionium-ene cyclization reaction mediated by boron trifluoride etherate.
S. Bondalapati, P. Gogoi, K. Indukuri, A. K. Saikia, J. Org. Chem., 2012, 77, 2508-2512.