Silyl Enol Ether Prins Cyclization: Diastereoselective Formation of Substituted Tetrahydropyran-4-ones
作者:Gidget C. Tay、Chloe Y. Huang、Scott D. Rychnovsky
DOI:10.1021/jo501580p
日期:2014.9.19
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。