Determination of the enantiomeric purity and absolute configuration of α-hydroxy phosphonates
作者:James K. Kozlowski、Nigam P. Rath、Christopher D. Spilling
DOI:10.1016/0040-4020(95)00308-u
日期:1995.6
The absolute configuration of α-hydroxy phosphonates was determined by NMR spectroscopy of the O-methyl mandelate ester derivatives. The O-methyl mandelate ester diastereoisomers are distinguishable by their 1H and 31P NMR spectra and the observed chemical shifts allow assignment of the absolute configuration of the phosphonate C-1. The crystal structure of (1R) dimethyl 1-[(2′R)-2′-methoxy-2′-phe
α-羟基膦酸酯的绝对构型通过O-甲基扁桃酸酯衍生物的NMR光谱法确定。O-扁桃酸酯非对映异构体的1 H和31 P NMR光谱区分开,观察到的化学位移可确定膦酸酯C-1的绝对构型。(1R)二甲基1的晶体结构- [(2'R)-2'-甲氧基-2'-苯基乙酰氧基] -3-苯基-2- ë丙烯基膦酸酯是通过X射线衍射来确定。该对映体可通过HPLC在手性文具相上分离,因此可以准确地确定羟基膦酸酯的对映体纯度。