Activation of Pig Liver Esterase in Organic Media with Organic Polymers. Application to the Enantioselective Acylation of Racemic Functionalized Secondary Alcohols
作者:Hans-Joachim Gais、Manfred Jungen、Vasudev Jadhav
DOI:10.1021/jo0016881
日期:2001.5.1
the aldehyde and the acid through imine formation and neutralization, respectively, but replenish at least in part also the water consumed in the competing hydrolysis of the acyl donor. A recovery of PLE together with the polymer was achieved without major loss of activity through their immobilization on a water-saturated polyaramide membrane, which occurs spontaneously in organic solvents.
猪肝酯酶(PLE)在有机溶剂中几乎没有醇与乙烯基酯酰化的活性。但是,在低水含量的有机溶剂中,添加甲氧基聚乙二醇(MPEG),牛血清白蛋白(BSA),TentaGelAmino树脂(TGA)或氨基甲基聚苯乙烯(AMPS)可使PLE与丙酸乙烯酯酰化醇的活性。 。聚合物活化的PLE在外消旋的1-烷氧基-,1-乙基硫烷基-和1-氟-3-芳基-2-丙醇以及外消旋的1-苯氧基-2-丙醇的酰化反应中显示出高对映选择性(E> 100)和外消旋的1-甲氧基-2-苯氧基-2-丙醇。聚合物活化的PLE的合成效用已通过1-甲氧基-3-苯基-2-丙醇,1-乙基硫烷基-3-苯基-2-丙醇,1-甲氧基-3-对羟基苯甲酸酯的克级分辨率证明。甲氧基苯基-2-丙醇,1-氟-3-苯基-2-丙醇,和1-甲氧基-3-苯氧基-2-丙醇。在醇与丙酸乙烯酯的PLE催化的酰化反应中,副产物乙醛和丙酸均对酶有害。另外,由于酰基供体的竞争性酶