Racemic α-acyloxyalkylphosphonates (±)-4 are prepared and tested for kinetic resolution by lipases AP 6 and to a minor extent by F-AP 15. The former proves to be a useful enzyme in terms of broadness of application, reaction rate and enantiomeric excess. Lipase F-AP 15 transformed neither of the two substrates checked for hydrolysis. Enzymatic hydrolysis of α-acyloxyphosphonates containing straight chain alkyl groups with lipase AP 6 yields (S)-α-hydroxyalkylphosphonates 3 preferentially. Substrates with branched chain alkyl groups are hydrolysed with lower enantioselectivity, the (R)-ester being saponified more easily than the (S)-ester.
制备了外消旋δ-±-乙酰氧基烷基
膦酸盐 (±)-4,并通过
脂肪酶 AP 6 和少量 F-AP 15 进行了动力学解析测试。前者在应用广泛性、反应速度和对映体过量方面被证明是一种有用的酶。
脂肪酶 F-AP 15 对两种底物都没有进行
水解转化。用
脂肪酶 AP 6 对含有直链烷基的 δ-acyloxyphosphonates 进行酶
水解,可优先生成 (S)-δ-hydroxyalkylphosphonates 3。含有支链烷基的底物
水解的对映选择性较低,(R)-酯比(S)-酯更容易被皂化。