An easily removable stereo-dictating group for enantioselective synthesis of propargylic amines
作者:Wu Fan、Shengming Ma
DOI:10.1039/c3cc45118f
日期:——
We report herein a CuBr-catalyzed three-component coupling of 2-methylbut-3-yn-2-ol, aldehydes and pyrrolidine or 1,2,3,4-tetrahydroisoquinoline leading to the corresponding chiral propargylamines in excellent enantiomeric excess (91 to >99% ee) and high yields (79–95% yield). The dimethylcarbinol unit in 2-methylbut-3-yn-2-ol, which may be easily removed at the later stage to regenerate a terminal alkyne unit for further elaboration, plays a very important role in ensuring high enantioselectivity. This protocol provides easy and very general access to different terminal and non-terminal tertiary propargylic amines.
我们在此报告了一种由CuBr催化的三组分耦合反应,该反应将2-甲基丁-3-炔-2-醇、醛和哌啶或1,2,3,4-四氢异喹啉结合,生成相应的手性炔基胺,具有优异的对映体过量(91%至>99% ee)和高产率(79%–95%)。2-甲基丁-3-炔-2-醇中的二甲基卡宾醇单元在后期可以很容易去除,以再生一个末端炔烃单元以进行进一步的修饰,且在确保高对映选择性方面发挥了非常重要的作用。该方案提供了对不同末端和非末端三级炔基胺的简便且非常通用的获得途径。