Reinvestigation of the chemoselective cyclopropanation of allylic alcohols, allylic ethers and alkenes: a comparison between various reagents and protocols
作者:André B. Charette、André Beauchemin
DOI:10.1016/s0022-328x(00)00725-7
日期:2001.1
The relative reactivities of various Zn, Al and Sm carbenoids in the chemoselective Simmons–Smith cyclopropanation of geraniol and its benzyl ether derivative were studied. Directed cyclopropanation was obtained in all cases, even with a iodomethylaluminum reagent. By variation of the reaction protocols using aluminum carbenoids, cyclopropanation can favor the proximal or distal double bond.
研究了香叶醇及其苄基醚衍生物的化学选择性Simmons-Smith环丙烷化中各种Zn,Al和Sm类胡萝卜素的相对反应性。在所有情况下,即使使用碘甲基铝试剂,也都可以获得直接环丙烷化。通过改变使用铝类胡萝卜素的反应方案,环丙烷化可以促进近端或远端的双键。