Contemporaneous Dual Catalysis: Chemoselective Cross-Coupling of Catalytic Vanadium–Allenoate and π-Allylpalladium Intermediates
作者:Barry M. Trost、Xinjun Luan、Yan Miller
DOI:10.1021/ja204817y
日期:2011.8.17
This paper presents a detailed investigation of a dual catalytic system that combines a vanadium-catalyzed Meyer-Schuster rearrangement and a palladium-catalyzed allylic alkylation. The implementation of this novel reaction relies on matching the formation rates of vanadium-allenoate and π-allylpalladium intermediates with their bimolecular coupling rate in order to minimize the undesired protonation
本文详细研究了一种双催化系统,该系统结合了钒催化的 Meyer-Schuster 重排和钯催化的烯丙基烷基化。这种新反应的实施依赖于钒-烯丙酸和 π-烯丙基钯中间体的形成速率与其双分子偶联速率的匹配,以最大限度地减少催化生成的中间体的不希望的质子化或 O-烷基化。通过调整钒和钯催化剂的配体结构和催化剂负载比,成功实现了这种双催化过程中的化学选择性。炔丙醇和碳酸烯丙酯组分的大量偶联伙伴很容易适应这种新的转化,这反过来又为各种 α-烯丙基化 α、