When the β-acyloxy esters (±)-10 and (±)-11 were exposed to the lipase OF-360 from Candida rugosa or immobilized lipase OF-360 in a water-saturated organic solvent, the hydrolyzed product (8aS)- was obtained in high chemical (40%) and optical (>99%ee) yields. The absolute structure of (8aS)-6 was confirmed by the fact that (8aS)-6 was converted into an authentic sample γ-keto nitrile (8aS)-17. Treatment of the diol (±)-12 with isopropenyl acetate in the presence of the lipase Godo E-4 from Pseudomonas sp. provided the unchanged (8aR)-12 (89%ee) in 42% yield.
当β-酰氧基酯(±)-10和(±)-11暴露在来自
黄酮霉Candida rugosa的OF-360
脂肪酶或固定化OF-360
脂肪酶于饱和
水的有机溶剂中时,得到的
水解产物(8aS)-以高
化学产率(40%)和光学纯度(>99%ee)获得。通过将(8aS)-6转化为一个正品样品γ-酮腈(8aS)-17,确认了(8aS)-6的绝对结构。将二醇(±)-12与异
丙烯醋酸酯在来自假单胞菌的Godo E-4
脂肪酶的存在下处理,得到未改变的(8aR)-12(89%ee),产率为42%。