An enzymatic synthesis of 2, 3-O-isopropylidene-sn-glycerol (10), the synthetic key intermediate for platelet-activating factor, was achieved. Several 1, 3-di-O-acyl-2-benzylglycerols (5a-d) were synthesized from dihydroxyacetone dimer (2), and subjected to enzyme-catalyzed asymmetric hydrolysis. The optical purities of the mono-hydrolyzed products (6) were determined from the 400 MHz proton nuclear magnetic resonance spectra after conversion of 6 to the esters of (-)α-methoxy-α-trifluoromethylphenylacetic acid. Upon hydrogenolysis of the benzyl ether, followed by protection of diol and hydrolysis of the acetate, (-)-6a afforded 10.
实现了血小板活化因子的合成关键中间体 2,3-O-异亚丙基-sn-
甘油(10)的酶法合成。从二
羟基丙酮二聚体(2)合成了几种 1,3-二-O-酰基-2-苄基
甘油(5a-d),并进行了酶催化不对称
水解。6 转化为(-)α-甲氧基-α-三
氟甲基
苯乙酸酯后,通过 400
MHz 质子核磁共振谱测定了单
水解产物(6)的光学纯度。在苄基醚氢解、二元醇保护和
乙酸酯
水解后,(-)-6a 得到 10。