Exploiting multiple nucleophilic sites on pyrrole for the assembly of polyheterocyclic frameworks: application to a formal total synthesis of (±)-aspidospermidine
Formal Synthesis of Aspidospermidine via the Intramolecular Cascade Transannular Cyclization
作者:Yu-Rong Yang、Jiu-Zhong Huang、Xiao-Ke Jie、Kun Wei、Hongbin Zhang、Min-Cai Wang
DOI:10.1055/s-0033-1338447
日期:——
aspidospermidine is reported through a novel preparation of Stork's penultimate tricyclic ketone intermediate. The key steps of the synthesis consist of an intramolecular cascade transannular cyclization, triggered by the removal of Boc group, which simultaneously forms the C, D, and E rings of aspidospermidine and conveniently setting up the quaternary stereo-center viadecarboxylative alkylation reaction of the