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