Enantioselective synthesis of gabapentin analogues via organocatalytic asymmetric Michael addition of α-branched aldehydes to β-nitroacrylates
作者:Masanori Yoshida、Erika Masaki、Hiroto Ikehara、Shoji Hara
DOI:10.1039/c2ob25413a
日期:——
Michael addition reaction of α-branched aldehydes to β-nitroacrylates was successfully carried out by using a mixed catalyst consisting of a primary amino acid, L-phenylalanine, and its lithium salt to give β-formyl-β′-nitroesters having a quaternary carbon centre in good yields (up to 85%) with high enantioselectivity (up to 98% ee). By using benzyl β-nitroacrylates as Michael acceptors, the obtained
通过使用由伯氨基酸组成的混合催化剂,成功地完成了α-支化醛与β-硝基丙烯酸酯的迈克尔加成反应, L-苯丙氨酸,及其锂盐,以高收率(最高98%ee)得到具有良好收率(最高85%)的具有季碳中心的β-甲酰基-β'-硝基酸酯。通过使用苄基β-硝基丙烯酸酯作为迈克尔受体,将获得的β-甲酰基-β'-硝基酯转化为各种4,4-二取代的吡咯烷-3-羧酸,包括加巴喷丁(NEUROTIN ®)在从以高收率的迈克尔加成物的一个步骤。