Titanium-mediated reductive cross-coupling reactions of imines with terminal alkynes: An efficient route for the synthesis of stereodefined allylic amines
作者:Kebin Mao、Guoqin Fan、Yuanhong Liu、Shi Li、Xu You、Dan Liu
DOI:10.3762/bjoc.9.69
日期:——
Low-valency titanium species, generated in situ by using Ti(OiPr)4/2 c-C5H9MgCl reagent, react with imines to give a titanium-imine complex that can couple with terminal alkynes to provide azatitanacyclopentenes with excellent regioselectivity. Stereodefined allylic amines are obtained in good yields after hydrolysis or iodonolysis of the corresponding azatitanacyclopentenes. When ethynylcyclopropane
使用 Ti(OiPr)4/2 c-C5H9MgCl 试剂原位生成的低价钛物质与亚胺反应生成钛-亚胺配合物,该配合物可与末端炔烃偶联,从而提供具有优异区域选择性的氮杂钛烷环戊烯。在相应的氮杂钛烷环戊烯水解或碘解后,以良好的收率获得了立体定义的烯丙胺。当乙炔基环丙烷用作偶联剂在该反应中与亚胺反应时,最初生成的烯丙胺在柱色谱过程中在硅胶上发生意外的 1,3-氨基迁移。