Chemoselective and stereoselective lithium carbenoid mediated cyclopropanation of acyclic allylic alcohols
作者:M. J. Durán-Peña、M. E. Flores-Giubi、J. M. Botubol-Ares、L. M. Harwood、I. G. Collado、A. J. Macías-Sánchez、R. Hernández-Galán
DOI:10.1039/c5ob02617b
日期:——
and the corresponding dihaloalkane has been evaluated. The reaction occurs in a chemo and stereoselective manner, which is consistent with a directing effect from the oxygen of the allylic moiety. Furthermore, a set of polyenes containing allylic hydroxyl or ether groups were chemoselectively and stereoselectively converted into the corresponding gem-dimethylcyclopropanes in one single step in moderate
已评估了香叶醇与由n -BuLi生成的不同锂类胡萝卜素与相应的二卤代烷烃的反应。该反应以化学和立体选择性的方式发生,这与来自烯丙基部分的氧的指导作用是一致的。此外,一组含有烯丙基羟基或醚基团的多烯的均化学选择性和立体选择性地转化为相应的宝石-dimethylcyclopropanes在一个单一步骤中中度至以锂介导的良好的产率产生卡宾原位通过反应Ñ正丁基锂和2, 2-二溴丙烷。