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 asymmetric arylation of ketone enolates 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
报道了一种用于酮的对映选择性 α-芳基化的新催化剂体系。这种由 Pd(2)(dba)(3) 和庞大的二烷基膦基-联萘配体制备的催化剂能够利用 NaO(t)()Bu 作为碱实现酮烯醇化物与芳基溴化物的不对称芳基化。这些新催化剂比以前的系统具有更高的反应性;芳基化反应可以在室温下使用仅 2 mol% 的 Pd 催化剂进行。α-烷基-α'-保护的环戊酮的偶联以高产率进行,所得四元立体中心的ee含量高达94%。