Biocatalytic Deracemization of 1,4-Benzodiazepines in the Synthesis of Enantiomerically Pure Serine
作者:Amir Avdagi?、Vitomir ?unji?
DOI:10.1002/hlca.19980810110
日期:1998.1.12
benzyloxycarbonyl; 12) and of its (R)-enantiomer is reported. Kinetic resolution of the easily available racemic 3-(hydroxymethyl)-1,4-benzodiazepin-2-ones is performed in the key step via acetylation by the immobilized Mucor miehei lipase (Lipozyme IM) at 60°. This method is characterized by high enantiomer purity (ee's ges; 99%) of the intermediary alcohols (+)-8 and (+)-9 and acetates (−)-10 and (−)-11, as
报道了(S)-N -Cbz-丝氨酸(Cbz =苄氧羰基;12)及其(R)-对映异构体的有效立体控制合成。在关键步骤中,通过固定化的Mucor miehei脂肪酶(Lipozyme IM)在60°下进行乙酰化,可以轻松获得外消旋的3-(羟甲基)-1,4-苯并二氮杂-2--2-酮的动力学拆分。该方法的特点是中间体醇(+)- 8和(+)- 9和乙酸酯(-)- 10和(-)- 11以及最终中间体的对映体纯度很高(ee's ges; 99%)乘积(S)-和(R)-N -Cbz-丝氨酸,生物催化剂的简单回收,2-氨基二苯甲酮(3和4)的完全回收并将其回收再用于1,4-苯并二氮杂卓的生产,并有可能选择性消旋“错”的醇对映体8和9在Amberlite CG 400存在的情况下。