The (-)-enantiomer of Corey lactone Ia has been separated from its (+)-enantiomer Ib via enantioselective esterification of the latter using glycerol tributyrate and catalytic amount of lipase from Candida cylindracea (EC 3.1.1.3) in an aprotic solvent at 20 to 40 °C during 5 to 48 h. The Ic obtained has been separated from Ia by column chromatography and converted back to Ib by acid catalyzed transesterification with methanol.
通过使用甘油三丁酸酯和来自圆筒形白色念珠菌(EC 3.1.1.3)的脂肪酶,在无极性溶剂中,在20至40℃的条件下进行了对后者进行对映选择性酯化的方法,从而分离出Corey内酯的(-)对映体Ia和其(+)对映体Ib。通过柱层析将得到的Ic与Ia分离,并通过酸催化下的甲醇转酯化反应将其转化回Ib。