Enantioselective microbial hydrolysis of C1 and C2 dissymmetrical cyclic carbonates with disubstitution (methyl and another groups) has been developed. Pseudomonas diminuta (FU0090), a bacterium, efficiently catalyzes the hydrolysis of five-membered cyclic carbonates. While the trans-substrates are hydrolyzed with low enantioselectivities and/or reactivities, the microbe hydrolyzes the cis-substrates
new method for the preparation of optically active acyclic α-hydroxy ketone derivatives by thermodynamic resolution using a chiral host compound is described. We examined the resolution of racemic 2-benzyloxy-3-pentanone with chiral host compounds in various solvents. After optimization of the reaction conditions, it has become apparent that the opticalresolution could occur only under certain strict
描述了一种使用手性主体化合物通过热力学拆分制备光学活性无环 α-羟基酮衍生物的新方法。我们研究了外消旋 2-benzyloxy-3-pentanone 与手性主体化合物在各种溶剂中的拆分。在优化反应条件后,很明显,光学拆分只能在溶剂、主体化合物和底物浓度的某些严格条件下发生。在室温下在 MeOH-H 2 O (1:1) 中搅拌带有环己基环的 (-)-TADDOL 的酮悬浮液,该悬浮液源自 L-酒石酸乙酯,产生具有高对映选择性的包合物,得到 (S) - 含高达 99% ee 的酮。另一方面,从滤液中得到的(R)-酮的ee可以通过使用(+)-TADDOL的相同程序得到改善;最后,得到几乎光学纯形式的酮的两种对映异构体。通过 ESI-TOFMS 分析形成的复合体假设主客比为 1:1。这种拆分过程也适用于其他基材,以提供相应的光学活性酮。