Synthesis of (±)-Strychnofoline via a Highly Convergent Selective Annulation Reaction
作者:Andreas Lerchner、Erick M. Carreira
DOI:10.1002/chem.200600957
日期:2006.11.6
Studies aimed at preparing (+/-)-strychnofoline by total synthesis are detailed. The route described makes use of a recently developed MgI(2)-mediated ring-expansion reaction of spiro[cyclopropan-1,3'-oxindole] with a cyclic disubstituted aldimine. The ring-expansion product was formed as a single diastereoisomer in 55 % yield, possessing the same stereochemical pattern found in strychnofoline. In
详细介绍了旨在通过全合成制备(+/-)-士多福啉的研究。所描述的路线利用了最近开发的MgI(2)介导的螺[cyclopropan-1,3'-oxindole]与环二取代的亚胺亚胺的扩环反应。扩环产物以单一非对映异构体的形式形成,产率为55%,具有与间苯二酚不同的立体化学模式。此外,我们的综合努力已导致开发新的反应方法以获取3,4-二取代的环状亚胺。