作者:Rubén S. Ramón、Nicolas Marion、Steven P. Nolan
DOI:10.1016/j.tet.2008.10.111
日期:2009.2
system allowing for the synthesis of a variety of α,β-unsaturated ketones has been developed. [(NHC)AuCl] (NHCN-heterocyclic carbene) in the presence of a silver(I) salt was found to catalyze the Meyer–Schuster rearrangement, leading to α,β-unsaturated ketones from easily accessible propargylic alcohols in high yields. Catalysis was performed in a 2:1 mixture of methanol and water at 60 °C and afforded
已经开发了允许合成多种α,β-不饱和酮的有效催化体系。发现[(NHC)AuCl](NHC N-杂环卡宾)在银(I)盐的存在下催化Meyer-Schuster重排,从而导致易于获得的炔丙醇以高收率产生α,β-不饱和酮。在60°C的甲醇和水的2:1混合物中进行催化,即使对于叔醇和空间要求苛刻的底物,也能提供良好的收率。对本催化体系的透彻评估发现,它不适用于末端炔烃和伯醇。在这些情况下,由于形成了意外的副产物,目标分子的收率很低。