An easy access to protected (4S, 5R)-5-alkyl-4-hydroxy-2-pyrrolidinones and their use as versatile synthetic intermediates
作者:Pei Qiang Huang、Shi Li Wang、Jian Liang Ye、Yuan Ping Ruan、You Qing Huang、Hong Zheng、Jing Xing Gao
DOI:10.1016/s0040-4020(98)00734-0
日期:1998.10
A versatile approach to enantiopure (4S, 5R)-5-alkyl-4-hydroxy-2-pyrrolidinones is described. The key steps involve a regioselective Grignard reagent addition to (S)-malimides, and diastereoselective reductive dehydroxylation of the resulting hemi-azaketals. The flexibility of this methodology has been demonstrated by the synthesis of (2R, 3R)-3-amino-1-benzyl-2-methylpyrrolidine, the parent diamine
描述了对映纯(4S,5R)-5-烷基-4-羟基-2-吡咯烷酮的通用方法。关键步骤涉及向(S)-苹果酰亚胺添加区域选择性格氏试剂,以及所得的半叠氮化合物的非对映选择性还原脱羟基。该方法的灵活性已通过合成(2R,3R)-3-氨基-1-苄基-2-甲基吡咯烷,抗精神病药的母体二胺,西那必利和β-羟基-γ的非天然对映异构体得到证明-内酰胺形式的Hapalosin氨基酸残基。