A versatile approach to cyclic ethers. Synthesis of disubstituted oxepanes and oxocanes
作者:M.Teresa Mujica、María M. Afonso、Antonio Galindo、J.Antonio Palenzuela
DOI:10.1016/s0040-4039(00)76919-x
日期:1994.5
A synthetic sequence for the preparation of α,α′-disubstituted cyclic ethers of various ring sizes and either relative stereochemistry (cis or trans) is presented. It is based on the hetero Diels Alder reaction of a monoactivated diene and an aldehyde, yielding a silylenol pyrone which is transformed into a linear ether. This ether is cyclized by an intramolecular nucleophilic substitution reaction
给出了制备各种环大小和相对立体化学(顺式或反式)的α,α'-二取代的环醚的合成序列。它基于单活化二烯与醛的杂Diels Alder反应,生成甲硅烷基吡喃酮,该甲硅烷基吡喃酮转化为线性醚。通过分子内亲核取代反应将该醚环化为所需的环状醚。通过制备两个实例,氧杂环丙烷和氧杂环戊烷证明了该路线的可行性。