A compound represented by a genera formula (Ia) or (Ib) and a stereo-selective preparation method thereof using a carbonyl reductase which is separated from
Kluyveromyces marxianus
. The compound can be prepared by reduction of substituted &bgr;-keto ester and can be used as an intermediate in preparing &bgr;-lactam group antibiotics.
1
由一般
化学式(Ia)或(Ib)代表的化合物及其立体选择性制备方法,使用从马氏克鲁维酵母中分离的羰基还原酶。该化合物可通过还原取代的β-
酮酯制备,并可用作制备β-内
酰胺类
抗生素中间体。