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
开发了一种有效的方法,可通过卤代丙二醛,分子内烯烃插入和β-杂原子消除,通过Pd(II)催化的无环N-烯丙基2-炔基酰胺的环化反应,制备α-亚烷基-γ-丁内酰胺。与无环链烷酸酯的环化相比,该反应受离去基团和卤离子浓度的影响较小。使用该方法实现了(+/-)-异氰基丁二烯和(+/-)-异氰基丁二烯的总合成。