A practical synthesis of enantiopure β-methyltryptophan ethyl ester for a preparation of diabetes drug
作者:Yasuhiro Sawai、Masahiro Mizuno、Tatsuya Ito、Jun-ichi Kawakami、Mitsuhisa Yamano
DOI:10.1016/j.tet.2009.06.027
日期:2009.8
A practical synthesis of (2R,3S)- and (2S,3R)-β-methyltryptophan ethyl ester (β-MeTrp-OEt) has been developed. Racemic threo-β-MeTrp-OEt was diastereoselectively prepared via crystallization-induced diastereomer transformation (CIDT) of the α-nitro equivalent of β-MeTrp-OEt. The enantiomers were resolved via diastereomeric salt formation using a half equivalent of (R)-2-(4-hydroxyphenoxy)propionic
已经开发了(2 R,3 S)-和(2 S,3 R)-β-甲基色氨酸乙酯(β-MeTrp-OEt)的实用合成方法。外消旋苏-β-MeTrp-OEt是通过β-MeTrp-OEt的α-硝基当量的结晶诱导非对映异构体转化(CIDT)进行非对映选择性制备的。对映异构体通过使用一半当量的(R)-2-(4-羟基苯氧基)丙酸通过非对映异构体盐形成而拆分。该方法允许候选糖尿病药物N -[(1 R,2 S)-1-(5-[((二甲基氨基)甲基] -2-乙氧基苯基}氨基羰基)-2-(1 H-吲哚-3-基)丙基] -4-苯基-1-哌啶甲酰胺以高收率和高质量制备。