Development of a Novel Chemoenzymatic Process for 3-(Methylsulfonyl)-<scp>l</scp>-phenylalanine Phenylmethyl Ester─A Key Intermediate of Lifitegrast (Xiidra)
作者:Chuanjun Wu、Heng Guo、Jiawei Tang、Lintao Xia、Jianfen Shao、Yongfu He、Fei Chen、Peng Peng、Yuewen Han、Chuanmeng Zhao、Fuli Zhang、Shaoxin Chen
DOI:10.1021/acs.oprd.3c00358
日期:2024.3.15
practical chemoenzymatic method was developed for the synthesis of chiral phenylalanine derivative 1, which is the key intermediate of Lifitegrast. In this established process, a simple and effective Zn/HCl reduction system was employed to obtain N-acetyl-3-bromo-phenylalanine 6, which served as the substrate for the subsequent enzymatic resolution process. Then, the key chiral intermediate, 3-bromo-l-phenylalanine
在本研究中,开发了一种实用的化学酶法来合成手性苯丙氨酸衍生物1,这是Lifitegrast的关键中间体。在此建立的过程中,采用简单有效的Zn/HCl还原系统来获得N-乙酰基-3-溴-苯丙氨酸6,其作为后续酶解过程的底物。然后,可以使用酰基酶(ACY)AmACY获得关键的手性中间体3-溴-1-苯丙氨酸7 。经过工艺优化,化学反应在 300 g 规模下进行,显着底物浓度达到 100 g/L。与50%的最大理论产率相比,该过程的产率达到了40%,并且对映体过量(ee)值高达99.9%。采用简单有效的Zn/HCl还原体系得到N-乙酰基-3-溴-苯丙氨酸6,作为后续酶解过程的底物。该合成途径得到有效执行,得到纯度为99.7%、ee值为99.9%的1·HCl ,最终总收率为23.4%。另外,使用乙酰酐/乙酸(Ac 2 O/AcOH)系统将不需要的( D )-6对映体再循环以形成( rac )-6。该回收过程的收率达到