A compound represented by a general 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 β-keto ester and can be used as an intermediate in preparing β-lactam group antibiotics.
一种由一般式(Ia)或(Ib)表示的化合物以及使用从马克斯氏酵母中分离出的羰基还原酶的立体选择性制备方法。该化合物可以通过还原取代的β-
酮酯来制备,并可用作制备β-内酰胺类抗生素的中间体。