enantioselective acylation of racemic diisopropyl α- and β-hydroxyphosphonates by hydrolases in t-butyl methyl ether with isopropenyl acetate as acyl donor is limited by the narrow substrate specificity of the enzymes. High enantiomeric excesses (up to 99%) were obtained for the acetates of (S)-diisopropyl 1-hydroxy-(2-thienyl)methyl-, 1-hydroxyethyl- and 1-hydroxyhexylphosphonate and (R)-diisopropyl 2-hydroxypropylphosphonate
外消旋
二异丙基α-和β-羟基
膦酸酯在
叔丁基甲基醚中通过
水解酶与
乙酸异丙烯酯作为酰基供体的对映选择性酰化受到酶狭窄的底物特异性的限制。对于(S)-
二异丙基1-羟基-(2-
噻吩基)甲基-,1-羟乙基-和1-羟
己基膦酸酯和(R)-
二异丙基2-羟
丙基膦酸酯的
乙酸酯,获得高对映体过量(至多99%)。双相系统中念珠菌和
蛋白酶枯草杆菌蛋白酶对
脂肪酶水解多种β-
氯乙酰氧基
膦酸酯的作用是对映体选择性的(S)-β-羟基
膦酸酯(ee 51–92%)。(S)-2-苯基-2-羟乙基-和(S)-3-甲基-2-羟基丁基
膦酸酯(ee分别为96%和99%)被转化为相同ee的(R)-2-
氨基膦酸。