作者:David R. Williams、Mark G. Fromhold、Jill D. Earley
DOI:10.1021/ol016336a
日期:2001.8.1
[structure: see text]. A stereocontrolled total synthesis of the polycyclic Stemona alkaloid, (-)-stemospironine (1) has been achieved. Key transformations include the use of a Staudinger reaction leading to the aza-Wittig ring closure of the perhydroazepine system. Formation of the vicinal pyrrolidine butyrolactone is described via the stereoselective intramolecular capture of an intermediate aziridinium
[结构:见文字]。实现了多环Stemona生物碱(-)-stemospironine(1)的立体控制全合成。关键的转化包括使用Staudinger反应,导致过氢氮杂system系统的aza-Wittig环闭合。邻位吡咯烷丁内酯的形成是通过中间体氮丙啶鎓盐的立体选择性分子内捕获来描述的。