conditions. In cooperation with a chiral‐phosphonium‐based phase‐transfer catalyst, the asymmetric direct oxidative allylic alkylations of 3‐substituted oxindoles are furnished under O2 atmosphere. The γ‐ or even remote ϵ‐regioselective alkylation products, with substantial substituents, are delivered with excellent enantioselectivity, and can be further used to access diverse chiral spirocyclic architectures
针对无共轭羰基化合物,开发了一种原子经济且高效的
乙烯基类化合物策略,该策略可在无
配体条件下与Pd(OAc)2生成电子不足的π-烯丙基铝配合物。与手性phosph基相转移催化剂配合使用,在O 2气氛下提供了3个取代的羟
吲哚的不对称直接氧化烯丙基烷基化反应。具有大量取代基的γ或什至偏远的ϵ区域选择性烷基化产物具有出色的对映选择性,可进一步用于有效地访问各种手性螺环结构。可以类似地使用Mukaiyama二烯醇甲
硅烷基醚,这表明当前的活性π-烯丙基铝物种是Pd互变异构化的结果II-二
壬酸酯中间体。