Palladium(II)-Catalyzed Synthesis of α-Alkylidene-γ-butyrolactams from <i>N</i>-Allylic 2-Alkynamides. Total Synthesis of (±)-Isocynodine and (±)-Isocynometrine
作者:Xu Xie、Xiyan Lu、Yanyun Liu、Wei Xu
DOI:10.1021/jo001704u
日期:2001.10.1
actams via the Pd(II)-catalyzed cyclization of acyclic N-allylic 2-alkynamides via halopalladation, intramolecular olefin insertion, and beta-heteroatom elimination was developed. The reaction is less influenced by the leaving group and the concentration of the halide ions in comparison with the cyclization of acyclic alkynoates. The total syntheses of (+/-)-isocynodine and (+/-)-isocynometrine were