Direct organocatalytic asymmetric Mannich-type reactions in aqueous media: one-pot Mannich-allylation reactions
作者:Armando Córdova、Carlos F Barbas
DOI:10.1016/s0040-4039(03)00019-4
日期:2003.2
organocatalytic asymmetric Mannich-type reactions in aqueous media are demonstrated herein. l-Proline-catalyzed reactions in aqueous media to provide β-formyl substituted α-amino acid derivatives with excellent diastereoselectivities (dr up to 19:1, syn/anti) and high enantioselectivities (ee between 72 and >99%). These conditions provided for the development of novel one-pot asymmetric syntheses of cyclic
本文证明了在水性介质中的第一个直接的有机催化不对称曼尼希型反应。在水介质中进行l-脯氨酸催化的反应,可提供具有出色的非对映选择性(dr高达19:1,syn / anti)和高对映选择性(ee在72至> 99%之间)的β-甲酰基取代的α-氨基酸衍生物。这些条件为开发新型的一锅式环状γ-烯丙基取代的α-氨基酸衍生物(ee高达> 99%)的不对称合成提供了条件。这是通过在水溶液介质中将脯氨酸催化的曼尼希型反应与铟促进的烯丙基化结合而实现的。