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Abstract | Cited by

Substituted dihydropyrans can be efficiently synthesized in good yields with excellent diastereoselectivity from the reaction of aldehydes or epoxides and ethyl 3-alkyl-3-hydroxy-5-methylhex-5-enoate via an oxonium–ene cyclization reaction catalyzed by trimethylsilyl trifluoromethanesulfonate (TMSOTf) under mild conditions.

Graphical abstract: Diastereoselective synthesis of substituted dihydropyrans via an oxonium–ene cyclization reaction

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