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.
A concise synthesis of (±)-vincadifformine and related Aspidosperma alkaloids (±)-desethylvincadifformine, (±)-ibophyllidine, (±)-20-epi-ibophyllidine, and (±)-desethylibophyllidine
作者:Marie-Christine Barsi、Bhupesh C. Das、Jean-Louis Fourrey、Rajeswari Sundaramoorthi
DOI:10.1039/c39850000088
日期:——
An expeditious total synthesis of (±)-vincadifformine (9) and relatedAspidospermaalkaloids (±)-desethylvincadifformine (10), (±)-ibophyllidine (11), (±)-20-epi-ibophyllidine (12), and (±)-desethylibophyllidine (13)via condensation of a common indole-2-acrylate precursor (2) and an appropriate amine (4) followed by acidic treatment is reported.