Lipase-catalyzed kinetic and dynamic kinetic resolution of 1,2,3,4-tetrahydroisoquinoline-1-carboxylic acid
摘要:
A dynamic kinetic resolution method for the preparation of enantiopure 1,2,3,4-tetrahydroisoquinoline-1-carboxylic acid (R)-2 was developed involving the CAL-B-catalyzed enantioselective hydrolysis of the corresponding ethyl ester (+/-)-1 in toluene/acetonitrile (4: 1) containing 1 equiv of added water and 0.25 equiv of dipropylamine. This method allowed the preparation of (R)-2 (ee = 96%) with 80% isolated yield. The kinetic resolution of (+/-)-1 in diisopropyl ether at 3 degrees C afforded both enantiomers with ee >= 92%. (c) 2007 Elsevier Ltd. All rights reserved.
[EN] METHOD FOR PREPARING (R)-PRAZIQUANTEL AND CHIRAL INTERMEDIATE THEREOF, AND COMPOSITION<br/>[FR] PROCÉDÉ DE PRÉPARATION DE (R)-PRAZIQUANTEL ET INTERMÉDIAIRE CHIRAL DE CELUI-CI, ET COMPOSITION<br/>[ZH] 一种左旋吡喹酮及其手性中间体的制备方法和组合物