(Sa)-Binam-D-prolinamide (20 mol%), instead of (Sa)-binam-L-prolinamide, in combination with chloroacetic acid (100 mol%) is an efficient organocatalyst for the direct aldol reaction between α-keto esters as electrophiles and alkyl and α-functionalised ketones, under quasi solvent-free conditions, providing access to highly functionalised chiral quaternary γ-keto α-hydroxyesters with up to 92% ee.
(S a)-Binam- D-脯
氨酰胺(20 mol%)代替(S a)-binam- L-脯
氨酰胺与
氯乙酸(100 mol%)结合使用是一种有效的有机催化剂,用于α之间的直接羟醛反应-
酮酯作为亲电子试剂以及烷基和α-官能化的酮,在准无溶剂条件下,可提供ee高达92%的高度官能化的手性季式γ-酮α-羟基酯。