Transition-Metal-Mediated Cascade Reactions: The Water-Accelerated Carboalumination−Claisen Rearrangement−Carbonyl Addition Reaction
作者:Peter Wipf、David L. Waller、Jonathan T. Reeves
DOI:10.1021/jo051211v
日期:2005.9.1
water-accelerated catalytic carboalumination, a Claisen rearrangement, and a nucleophilic carbonyl addition converts terminal alkynes and allyl vinyl ethers into allylic alcohols containing up to three contiguous asymmetric carbon centers. Stoichiometric quantities of water as an additive increase the rate of the [3,3] sigmatropic rearrangement as well as the diastereoselectivity of the carbonyl addition
一个三步骤的级联反应,包括水加速催化的碳铝化,克莱森重排和亲核羰基加成,将末端炔烃和烯丙基乙烯基醚转化为包含最多三个连续不对称碳中心的烯丙基醇。作为添加剂的化学计量量的水增加了[3,3]σ重排的速率以及羰基加成过程的非对映选择性。反应产物含有1,6-二烯官能团,该官能团易于环化成取代的环戊烯。对于环丙基甲基乙烯基醚底物,将该方法扩展到涉及[1,3]σ位移的序列是可行的。