One-Pot, Regioselective Synthesis of Substituted Arylglycines for Kinetic Resolution by Penicillin G Acylase
作者:Peter Grundmann、Wolf-Dieter Fessner
DOI:10.1002/adsc.200800203
日期:2008.8.4
phenylacetamide and glyoxylic acid offers an inexpensive route to a large variety of N-phenylacetylated arylglycines that are suited for immediate enzymatic resolution by penicillin G acylase. When performed under mild conditions at 5 °C in acetic acid/HCl, this simple one-pot operation resulted in the formation of single regioisomers only (≥98%). Subsequent kinetic resolution of the amino acid derivatives by penicillin
用苯乙酰胺和乙醛酸将富电子芳烃的酰胺烷基化为廉价的生产各种N-苯基乙酰化芳基甘氨酸的途径提供了一条廉价途径,这些途径适合通过青霉素G酰基转移酶立即进行酶促拆分。当在5°C的乙酸/ HCl中于温和条件下进行时,这种简单的一锅操作只能形成单一的区域异构体(≥98%)。随后在E值> 100的情况下,发生青霉素G酰基转移酶对氨基酸衍生物的动力学拆分,通常E值> 100,因此可提供具有高对映体纯度的游离(S)-构型芳基甘氨酸。对应的对映体(R底物,可通过相选择萃取工艺轻松分离,可在常规水解过程中提供相应的(R)-对映异构体。此一锅,两步的芳基甘氨酸合成,拆分和后处理程序需要最少的设备,并允许以小规模快速接触非天然α-氨基酸的对映体(S)和(R)对映体-大量生产。