Chiral Nanoparticles/Lewis Acids as Cooperative Catalysts for Asymmetric 1,4‐Addition of Arylboronic Acids to α,β‐Unsaturated Amides
作者:Tomohiro Yasukawa、Yuuki Saito、Hiroyuki Miyamura、Shū Kobayashi
DOI:10.1002/anie.201601559
日期:2016.7.4
Cooperative catalysts consisting of chiral Rh/Ag nanoparticles and Sc(OTf)3 have been developed that catalyze asymmetric 1,4‐addition reactions of arylboronic acids with α,β‐unsaturated amides efficiently. The reaction has been considered one of the most challenging reactions because of the low reactivity of the amide substrates. The new catalysts provide the desired products with outstanding enantioselectivities
已经开发了由手性Rh / Ag纳米粒子和Sc(OTf)3组成的协同催化剂,可有效催化芳基硼酸与α,β-不饱和酰胺的不对称1,4加成反应。由于酰胺底物的低反应性,该反应被认为是最具挑战性的反应之一。在催化剂的低负载量(<0.5mol%)的存在下,新型催化剂为所需产物提供了优异的对映选择性(> 98% ee)。