An enantioselective strategy for the total synthesis of (S)-tylophorine via catalytic asymmetric allylation and a one-pot DMAP-promoted isocyanate formation/Lewis acid catalyzed cyclization sequence
作者:Bo Su、Hui Zhang、Meng Deng、Qingmin Wang
DOI:10.1039/c4ob00200h
日期:——
A new asymmetric total synthesis of a phenanthroindolizidine alkaloid (S)-tylophorine is reported, which features a catalytic asymmetric allylation of aldehydes and an unexpected one-pot DMAP promoted isocyanate formation and Lewis acid catalyzed intramolecular cyclization reaction. In addition, White's direct C–H oxidation catalyst system converting monosubstituted olefins to linear allylic acetates