Synthetic study of perophoramidine: construction of pentacyclic core structure via SmI2-mediated reductive cyclization
作者:Takayuki Ishida、Yoshiji Takemoto
DOI:10.1016/j.tet.2013.04.039
日期:2013.6
product was different from the desired one, the optimized palladium-catalyzed aryl amidination realized the isomerization and C–N bond formation in a single step and resulted in efficient construction of pentacyclic core of perophoramidine synthetically equivalent to the Rainier's intermediate.
碳二亚胺和不饱和内酰胺的分子内SmI 2介导的还原环化作用被施加到带有四取代烯烃的官能化底物上。该反应以高产率提供芳基化的螺-2-亚氨基二氢吲哚。尽管产物的立体化学与所需的立体化学不同,但优化的钯催化的芳基酰胺化仅一步实现了异构化和C–N键的形成,并有效地构建了与Rainier中间体等效的过邻苯二or啶的五环核。