Microbiological asymmetric reduction of methyl 3-(2-furyl)-2-methyl-3-oxopropionate (5) by various yeasts was carried out. Four kinds of methyl 3-(2-furyl)-3-hydroxy-2-methyl propionates (6a-6d) could be obtained separately from the prochiral β-keto ester 5 by reduction with properly selected microorganisms. In particular, the desired syn-isomer 6a was obtained with high optical purity (>99% e.e.). Both the chemical yield and the optical purity of the reduction products (6a-6d) were significantly improved when fermentation was carried out on a large scale using a 30 1 jar fermentor or a 200 1 tank.
对甲基3-(2-
呋喃基)-2-甲基-
3-氧代丙酸酯(5)进行了微
生物不对称还原。通过用适当选择的微
生物进行还原,可以从手性前体β-
酮酯5中分别得到四种甲基3-(2-
呋喃基)-3-羟基-2-甲基
丙酸酯(6a-6d)。特别是,所希望的顺式异构体6a获得了高光学纯度(>99% e.e.)。当使用30 1罐发酵器或200 1罐进行大规模发酵时,还原产物(6a-6d)的
化学产率和光学纯度都得到了显著提高。