developed. The key step of this methodology, a silyl enol ether Prins cyclization, was promoted by a condensation reaction between a hydroxy silyl enol ether and an aldehyde to afford substituted tetrahydropyran-4-ones. The cyclization was tolerant of many functional groups, and the modular synthesis of the hydroxy silyl enol ether allowed for the formation of more than 30 new tetrahydropyran-4-ones with
开发了顺式-
2,6-二取代四
氢吡喃-4-酮的非对映选择性合成方法。该方法的关键步骤是羟基甲
硅烷基
烯醇醚和醛之间的缩合反应,以得到取代的四
氢吡喃-4-酮,从而促进甲
硅烷基
烯醇醚Prins环化。环化能够耐受许多官能团,并且羟基
硅基
烯醇醚的模块化合成允许形成超过 30 种新的四
氢吡喃-4-酮,产率高达 97% 和 >95:5 dr。环化步骤形成新的
碳-
碳和
碳-
氧键,以及具有良好非对映选择性的四元中心。该方法为取代
四氢吡喃的合成提供了一条通用途径。