Asymmetric synthesis of platelet-activating factor (PAF) and its enantiomer by using biocatalysts was studied. Microbial reduction of the pro-chiral α-ketoester (3) afforded (+) -4 (> 99% ee), which could be converted to (+) -and (-) -batyl alcohol (12), a key synthetic intermediate for PAF. Compound (-) -4 (96% ee), with the requisite configuration for the synthesis of natural PAF, could also be obtained by enzyme-catalyzed enantioselective hydrolysis of (±) -15.
利用
生物催化剂研究了血小板活化因子(PAF)及其对映体的不对称合成。微
生物还原原手性α-
酮酯(3)可得到(+) -4 (> 99% ee),该化合物可转化为(+) -和(-) -伯醇(12),后者是 PAF 的关键合成中间体。通过酶催化对映体选择性
水解(±) -15,还可以得到具有合成天然 PAF 所需构型的化合物 (-) -4 (96% ee)。