Enantiodivergent synthesis of both enantiomers of the macrocyclic lactone lasiodiplodin
作者:Franz Bracher、Brigitte Schulte
DOI:10.1039/p19960002619
日期:——
A straightforward approach to both enantiomers of lasiodiplodin 1 is described utilizing (S)-2-(2-hydroxypropyl)-1,3-dithiane 3 as a chiral building block. The key step is a Pd0-catalysed cross coupling of an arene trifluoromethanesulfonate with a 9-alkyl-9-borabicyclo[3.3.1]nonane derivative. The two enantiomers 1 and ent-1 have been obtained in an enantiodivergent manner by macrolactonization of the hydroxy acid 10 with either Gerlach's modification of the Corey lactonization or a Mitsunobu lactonization.
一种简单的方法被描述用于合成激素lasiodiplodin 1的两种对映体,利用(S)-2-(2-羟基丙基)-1,3-二硫杂烷 3作为手性构建块。关键步骤是Pd0催化的芳烃三氟甲磺酸酯与9-烷基-9-硼双环[3.3.1]九烷衍生物的交叉偶联。通过使用Gerlach的Corey内酯化改良法或Mitsunobu内酯化法,将羟基酸10进行大环内酯化,从而以对映异构体多样化的方式获得了两种对映体1和ent-1。