An Improved Catalyst for the Asymmetric Arylation of Ketone Enolates
作者:Takayuki Hamada、André Chieffi、Jens Åhman、Stephen L. Buchwald
DOI:10.1021/ja011122+
日期:2002.2.1
system for the enantioselective alpha-arylation of ketones is reported. This catalyst, prepared from Pd(2)(dba)(3) and a bulky dialkylphosphino-binaphthyl ligand, is able to effect the asymmetricarylation of ketoneenolates with aryl bromides utilizing NaO(t)()Bu as base. These new catalysts enjoy much higher reactivity than previous systems; arylation reactions could be effected at room temperature