An enantiospecific synthesis of (+)- and (−)-20-epi-ibophyllidine via an intramolecular diels-alder type cyclization
作者:Samir Jegham、Jean-Louis Fourrey、Bhupesh C. Das
DOI:10.1016/s0040-4039(00)99624-2
日期:1989.1
An enantiospecificsynthesis of the pentacyclic pseudo-Aspidosperma alkaloid (+)-20-epi-ibophyllidine 1 as well as of its (−)-enantiomer has been achieved via an intramolecular Diels-Alder type cycloaddition of a transient secodine-like intermediate 6 formed by condensation of the indole-2-acrylate precursor 2 and the appropriate chiral amine 3 followed by acidic treatment.