An enzymatically enantioselective ester hydrolysis of prochiral 1,3-diacyloxy-2-substituted-2-propanol to chiral 1-acyloxy-2,3-propanediol was studied. The (R)-monoester was prepared by selection of a suitable lipase and alkyl chain length of the substrate diester. Lipase D from Rhizopus delemer gave (R)-1-isobutyryloxy-2-(2,4-difluorophenyl)-2,3-propanediol with 97%ee and 87% yield at 15°C and pH 5.5. The (R)-monoester is a key intermediate of azole antifungal agents.
研究了通过酶促手性选择性酯
水解反应,将前手性的1,3-二酰氧基-2-取代-2-
丙醇转化为手性的1-酰氧基-2,3-
丙二醇。通过选择适当的
脂肪酶和底物二酯的烷基链长度,制备了(R)-单酯。来自粉红酵母的脂酶D在15°C和pH 5.5条件下,以97%ee和87%的产率得到(R)-1-异丁酰氧基-2-(2,4-二
氟苯基)-2,3-
丙二醇。该(R)-单酯是唑类抗真菌剂的关键中间体。