Stereoselective synthesis of a 2,2,5-trisubstituted tetrahydropyran chiron via 1,3- and 1,6-asymmetric induction: A total synthesis of (−)-malyngolide
作者:Naoyoshi Maezaki、Yûki Matsumori、Takeshi Shogaki、Motohiro Soejima、Hirofumi Ohishi、Tetsuaki Tanaka、Chuzo Iwata
DOI:10.1016/s0040-4020(98)00810-2
日期:1998.10
TiCl4 and allyltrimetylsilane at −100 °C, the selectivity of acetal fission is 10:1 and that of nucleophilic attack is 12 : 1. This reaction is successfully applied to a total synthesis of marine antibiotics, (−)-malyngolide.
描述了一种合成手性2,2,5-三取代四氢吡喃的新模式,其中通过手性和基团选择性双亲缩醛1的亲核缩醛裂解反应同时引入两个手性中心,从而完成1,3-和1,6-不对称感应。据透露,亲的缩醛裂解ř CO键和亲核攻击裂解的键相对优先进行。使用TiCl 4和烯丙基三甲硅烷在-100°C时,乙缩醛裂变的选择性为10:1,亲核攻击的选择性为12:1。该反应已成功应用于海洋抗生素(-)-麦芽糖内酯的全合成。