Enantioselective hydrolysis of water-insoluble α-acyloxy esters, (±)-5 and (±)-6, was carried out using lipases immobilized with Celite or a synthetic prepolymer (ENTP-4000 or ENT-4000) in a water-saturated organic solvent to produce chiral intermediates, (2S, 3S)-5 and (2S, 3R)-4, for the synthesis of diltiazem hydrochloride 1 and (-)-indolmycin 2, respectively. Furthermore, enantioselective hydrolysis of (±)-6 using lipid-lipase aggregates in water-saturated organic solvent was also found to give (2S, 3R)-4.
选择性
水解
水不溶性α-酰氧基酯(±)-5和(±)-6,采用用Celite或合成预聚合物(ENTP-4000或ENT-4000)固定化的
脂肪酶,在饱和
水的有机溶剂中进行,生成用于合成
盐酸地尔尼定1和
(-)-吲哚霉素2的手性中间体(2S, 3S)-5和(2S, 3R)-4。此外,使用脂质-
脂肪酶聚集体在饱和
水的有机溶剂中对(±)-6进行选择性
水解同样得到了(2S, 3R)-4。