Enzymes in organic chemistry, part 2: Lipase-catalysed hydrolysis of 1-acyloxy-2-arylethylphosphonates and synthesis of phosphonic acid analogues of L-phenylalanine and L-tyrosine
作者:Martina Drescher、Yong-Fu Li、Friedrich Hammerschmidt
DOI:10.1016/0040-4020(95)98691-a
日期:1995.4
α-Hydroxyphosphonates (±)-3, prepared by base catalysed addition of phosphites 2 to aldehydes 1, were acylated to give esters (±)-4. Diethyl 1-acyloxy-2-arylethylphosphonates (±)-4a, 4b, and 4e were hydrolysed by lipase from Aspergillus niger in a biphasic system to afford (R)-α-hydroxyphosphonates of low enantiomeric purity. The corresponding diisopropyl phosphonates (±)-4c, 4f and 4g gave (S)-α-hydroxyphosphonates
通过将亚磷酸酯2碱催化加成到醛1中而制得的α-羟基膦酸酯(±)-3被酰化,得到酯(±)-4。在双相系统中,通过来自黑曲霉的脂肪酶水解1-酰氧基-2-芳基乙基膦酸二乙酯(±)-4a,4b和4e,得到对映体纯度低的(R)-α-羟基膦酸酯。相应的二异丙基膦酸酯(±)-4c,4f和4g得到(S)-α-羟基膦酸酯,ee最高可达78%。通过其(R)-MTPA-酯的31 P NMR光谱法确定了α-羟基膦酸酯的绝对构型。化合物3a和3e分别通过其叠氮化物化学转化为L-苯丙氨酸和L-酪氨酸的膦酸类似物。