enoates using Candida parapsilosis ATCC 7330 resulted in the formation of one enantiomer in high enantiomeric excess [up to >99% ee] and isolated yields [up to 79%]. The absolute configuration of the enantiomerically pure (3E)-ethyl-4-(thiophene-2-yl)-2-hydroxybut-3-enoate as determined by 1H NMR of the Mosher esters was found to be (S).
使用假丝酵母假丝酵母A
TCC 7330对消旋的(3 E)-烷基-4-(杂-2-基)-2-羟基丁-3-
烯酸
酯进行消旋,导致形成一种对映体,其对映体过量高[ee高达> 99% ]和孤立的收率[高达79%]。通过Mosher
酯的1 H NMR测定,发现对映体纯的(3 E)-乙基-4-(
噻吩-2-基)-2-羟基丁-3-
烯酸
酯的绝对构型为(S)。