Diastereoselective synthesis of substituted dihydropyrans via an oxonium–ene cyclization reaction
作者:Pipas Saha、Priya Ghosh、Sabera Sultana、Anil K. Saikia
DOI:10.1039/c2ob26088c
日期:——
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.
醛或环氧化物与3-烷基-3-羟基-5-羟基-5-甲基己基-5-烯酸乙酯经氧-烯环化反应催化反应,可以高效,高收率地合成具有良好非对映选择性的取代二氢吡喃。三甲基甲硅烷基三氟甲磺酸盐 (TMSOTf)在温和的条件下。