Enantioselective Organocatalytic α-Alkylation of Ketones by SN1-Type Reaction of Alcohols
作者:Maria Trifonidou、Christoforos G. Kokotos
DOI:10.1002/ejoc.201101509
日期:2012.3
The enantioselective α-alkylation reaction of cyclic ketones is described. Our catalyst, based on a “privileged” pyrrolidine ring bearing a chiral thioxotetrahydropyrimidinone ring, is a highly reactive catalyst for cyclic ketones. When this catalyst was coupled with in situ generated carbocations derived from alcohols, the corresponding α-alkylated adducts were obtained in moderate to quantitative
描述了环酮的对映选择性α-烷基化反应。我们的催化剂基于带有手性硫代四氢嘧啶酮环的“特权”吡咯烷环,是一种高反应性的环酮催化剂。当这种催化剂与原位生成的由醇衍生的碳阳离子偶联时,相应的 α-烷基化加合物以中等到定量的产率和低到高的对映选择性(高达 80% ee)获得。催化剂负载量可有效降低至 10%,这是文献中报道的此类有机催化转化的最低值。