Efficient Resolution of<i>cis</i>-(±)-Dimethyl 1-Acetylpiperidine-2,3-dicarboxylate with Soluble<i>Candida antarctica</i>Lipase B (CAL B)
作者:Perla Ramesh、Tirunagari Harini、Nitin W. Fadnavis
DOI:10.1021/op5003424
日期:2015.1.16
(2S,3R)-Dimethyl 1-acetylpiperidine-2,3-dicarboxylate, a valuable intermediate for moxifloxacin, was prepared by CAL B catalyzed kinetic resolution of the racemic diester. The reaction has an optimum temperature of 45–50 °C and an optimum pH of 7.5. It follows typical Michaelis–Menten kinetics with Vmax,obsd = 0.061 ± 0.008 M/h/g, Km,obsd = 0.2 ± 0.045 M at 45 °C. The reaction is highly enantioselective
通过CAL B催化外消旋二酯的动力学拆分,制备了(2 S,3 R)-1-乙酰基哌啶-2,3-二羧酸二甲酯(莫西沙星的重要中间体)。该反应的最佳温度为45–50°C,最佳pH为7.5。它遵循典型的Michaelis-Menten动力学,在45°C下V max,obsd = 0.061±0.008 M / h / g,K m,obsd = 0.2±0.045M。该反应具有高对映选择性和对映选择性E45°C和pH 7.5时的80值。制备规模的酶促拆分在45°C的0.01 M磷酸钠缓冲液,pH 7.5中进行,底物负载率为8%(w / w),底物与酶之比为2:1(w / w)。反应在16小时内完成。以47.5%的产率(理论值的95%)获得对映体纯的二酯(ee> 99%)。不需要的水解半酯(ee 87%)可通过5个简单步骤轻松转化回外消旋二酯,总收率达75%。