Total synthesis of zincophorin methyl ester. Stereocontrol of 1,2-induction using sterically hindered enoxysilanes
作者:François Godin、Philippe Mochirian、Gabrielle St-Pierre、Yvan Guindon
DOI:10.1016/j.tet.2014.11.061
日期:2015.1
Reported herein is the total synthesis of zincophorin methyl ester, a polyketide ionophore. Of particular interest is the use of sterically hindered nucleophiles to surmount the unfavorable stereochemical outcome, leading to acetate aldol adducts, in nucleophilic addition to the aldehyde derived from propionates. The approach is based on the addition of an enoxysilane (bearing a removable phenylselenide
本文报道的是聚酮化物离子载体锌卟啉甲酯的全合成。特别令人感兴趣的是,在向丙酸酯衍生的醛的亲核加成中,使用空间位阻亲核试剂来克服不利的立体化学结果,导致乙酸羟醛加合物。该方法基于添加环氧乙烷(带有可移动的苯基硒化物部分)以在BF 3 OEt 2介导的Mukaiyama醛醇缩合反应中选择性生成Felkin-Anh加合物。随后硒化物基团的还原导致相应的乙酸顺式-羟醛基序,并且该方法被用于选择性地诱导锌卟啉的C12–C13关系。