Improved simplicity and practicability in copper-catalyzed alkynylation of tetrahydroisoquinoline
作者:Birgit Gröll、Patricia Schaaf、Michael Schnürch
DOI:10.1007/s00706-016-1877-5
日期:2017.1
AbstractAlkynylation reactions of N-protected tetrahydroisoquinolines have been performed using several different protocols of cross dehydrogenative coupling. Initially, a CuCl-catalyzed method was investigated, which worked well with three different N-protecting groups, namely phenyl, PMP, and benzyl and t-BuOOH as oxidant in acetonitrile as solvent. The peroxide could then be replaced by simple air
AbstractN-保护的四氢异喹啉的炔基化反应已使用交叉脱氢偶联的几种不同方案进行。最初,研究了CuCl催化的方法,该方法在三种不同的N保护基(即苯基,PMP和苄基以及叔丁基OOH)作为氧化剂在乙腈中作为溶剂时效果很好。然后可以用简单的空气和乙腈代替水来生产过氧化物,从而实现总体上非常环保的方案。最后,还使用空气作为氧化剂,开发了从炔酸开始的脱羧烷基化方案。这避免了在引入短链炔烃取代基中使用气态炔烃。 图形概要