An unexpected tandem enantioselective Michael addition/oxa-nucleophilic rearrangement reaction of β,γ-unsaturated α-keto esters catalyzed by cinchona alkaloids
作者:Hai-Feng Wang、Chang-Wu Zheng、Ying-Quan Yang、Zhuo Chai、Gang Zhao
DOI:10.1016/j.tetasy.2008.11.007
日期:2008.11
Cinchona alkaloids were found to catalyze an enantioselective Michael addition/oxa-nucleophilic rearrangement reaction of β,γ-unsaturated α-keto esters 1 and malonates 2. Using the optimum catalyst quinine 4a, a series of the rearranged products 3 were obtained with up to 98% yield and 82% ee under mild reaction conditions.
发现金鸡纳生物碱催化β,γ-不饱和α-酮酯1和丙二酸酯2的对映选择性迈克尔加成/氧合亲核重排反应。使用最佳催化剂奎宁4a,在温和的反应条件下获得了一系列重排产物3,产率高达98%,ee达到82%。