Hydrolytic Reactions of Thymidine 5′-O-Phenyl-N-Alkylphosphoramidates, Models of Nucleoside 5′-Monophosphate Prodrugs
作者:Mikko Ora、Jarno Ojanperä、Harri Lönnberg
DOI:10.1002/chem.200700623
日期:2007.10.15
of the starting material 3 occurred as a side reaction. Comparative measurements with thymidine 5'-N-[(1S)-2-oxo-2-methoxy-1-methylethyl]phosphoramidate} (4) revealed that, under acidic conditions, this diester-like compound is hydrolyzed by P--N bond cleavage three orders of magnitude more rapidly than the triester-like 3. At pH>5, the stability order is reversed, with 3 being hydrolyzed six times
从而导致胸腺嘧啶核苷或苯酚的离开而没有任何中间体的明显积累。两种途径都代表3总体消失的一半。苯酚的离开最终导致5'-磷酸胸苷的形成。在pH> 5时,主要反应是羧酸酯键的水解,然后是羧酸根离子在分子内置换酚盐离子,然后将所得的环状混合酸酐水解成无环二酯状胸苷5'-氨基磷酸酯。后者产物定量地积累,没有任何进一步分解的迹象。原料3的氢氧根离子催化的P-OPh键断裂是副反应。与胸苷5'的比较测量