A procedure for the in situ generation of the phenyliodonium ylide (2) derived from Meldrum’s acid (1) and its Rh(II)-catalyzed decomposition to afford an intermediate metallocarbene is described. In the presence of olefins, cyclopropanes are formed with yields and enantioselectivity comparable to that resulting from cyclopropanation with the isolated ylide 2.
描述了一种原位生成源自Meldrum酸(1)的苯基
碘鎓叶立德(2)及其Rh(II)催化的分解过程,以产生中间
金属卡宾。在存在烯烃的条件下,形成
环丙烷,其产率和立体选择性与分离叶立德2的
环丙烷化反应相当。