Enantioselective synthesis of a key tricyclic intermediateen route to (+)-gelsemine
作者:Jan Dijkink、Jean-Christophe Cintrat、W.Nico Speckamp、Henk Hiemstra
DOI:10.1016/s0040-4039(99)01132-6
日期:1999.8
The efficient synthesis of an enantiopure tricyclic lactam starting from (S)-5-isopropoxypyrrolin-2-one is described. The racemate of this tricyclic lactam is an intermediate in our previously published total synthesis of racemic gelsemine, so that the present work paves the way for the synthesis of the enantiopure alkaloid. The synthetic route includes a Sonogashira coupling, a highly selective Diels-Alder
描述了从(S)-5-异丙氧基吡咯啉-2-酮开始的对映纯三环内酰胺的有效合成。该三环内酰胺的外消旋物是我们先前发表的外消旋甘露糖胺的全合成中的中间体,因此本工作为对映体纯生物碱的合成铺平了道路。合成途径包括Sonogashira偶联,高度选择性的Diels-Alder反应和三氟甲磺酸三甲基甲硅烷基酯介导的N-酰基亚胺离子环化为关键步骤。