Asymmetric Mannich Reactions of β-Keto Esters with Acyl Imines Catalyzed by Cinchona Alkaloids
作者:Sha Lou、Brandon M. Taoka、Amal Ting、Scott E. Schaus
DOI:10.1021/ja0537373
日期:2005.8.1
Cinchona alkaloids catalyze the enantioselective Mannich reaction of beta-keto esters with acyl aryl imines. The reaction requires 10 mol % of cinchonine or cinchonidine. The reaction products are obtained in good yields (81-99%), high enantioselectivities (80-96% ee), and in diastereoselectivities that range from 1:1 to >95:5. The cinchonine-catalyzed reaction provides access to highly functionalized
金鸡纳生物碱催化 β-酮酯与酰基芳基亚胺的对映选择性曼尼希反应。该反应需要 10 mol% 的辛可宁或辛可尼丁。以良好的产率 (81-99%)、高对映选择性 (80-96% ee) 和 1:1 至 >95:5 的非对映选择性获得反应产物。辛可宁催化的反应为二氢嘧啶酮和β-氨基醇的不对称合成中使用的高度官能化的构建块提供了途径。