Total Synthesis of Spinosyn A. 2. Degradation Studies Involving the Pure Factor and Its Complete Reconstitution
作者:Leo A. Paquette、Iván Collado、Mark Purdie
DOI:10.1021/ja974010k
日期:1998.3.1
A total synthesis of natural levorotatory spinosyn A (1) has been achieved. The first objective, to confirm the absolute configurational assignment of tricyclic ketone 2 prepared earlier, was accomplished by oxidative degradation of the macrocyclic lactone ring in 1. The route began with the implementation of a four-step one-pot process that resulted in the efficient conversion of 6 into 18. A combination
已实现天然左旋多杀菌素 A (1) 的全合成。第一个目标,即确认先前制备的三环酮 2 的绝对构型分配,是通过 1 中大环内酯环的氧化降解来实现的。该路线开始于实施四步一锅法,从而获得了高效的6 转化为 18。高碘酸盐裂解和过酸氧化事件的组合然后导致 2。在重建阶段,Pd 催化的乙烯基锡烷与酰氯的偶联以对映控制的方式重建了绝大多数结构。一旦实现大环内酯化,首先引入 2,3,4-tri-O-methylrhamnose 单元,并具有非常好的立体控制。最后糖苷化,