Synthesis of enantiomeric diethyl (1R,2R)- and (1S,2R)-1,2,3-trihydroxypropylphosphonates
作者:Andrzej E. Wróblewski、Katarzyna B. Balcerzak
DOI:10.1016/s0040-4020(98)00366-4
日期:1998.6
Addition of diethyl phosphite to 2,3-O-cyclohexylidene-D-glyceraldehyde catalyzed by triethylamine or fluorides led to ca. 35:65 mixtures of diethyl (1R,2R)- and (1S,2R)-2,3-O-cyclohexylidene-1,2,3-trihydroxypropylphosphonates (4a) and (4b). Application of lithium diethylphosphonate only slightly improved diastereoselectivity. Through chromatographic separation of 4a and 4b the protected trihydroxypropylphosphonates
在三乙胺或氟化物的催化下,将亚磷酸二乙酯加成到2,3- O-环己叉基-D-甘油醛中,结果大约为。(1 R,2 R)-和(1 S,2 R)-2,3 - O-亚环己基-1,2,3-三羟丙基膦酸酯(4a)和(4b)的35:65混合物。二乙基膦酸锂的施用仅稍微改善了非对映选择性。通过4a和4b的色谱分离,被保护的三羟丙基膦酸酯首次成为纯对映异构体。主要非对映异构体中的1 S构型根据从标题化合物获得的1,2- O-异亚丙基衍生物的构象和构型分析,分配4b。