Chemical and enzymatic stability of amino acid derived phosphoramidates of antiviral nucleoside 5′-monophosphates bearing a biodegradable protecting group
作者:Anna Leisvuori、Yuichiro Aiba、Tuomas Lönnberg、Päivi Poijärvi-Virta、Laurence Blatt、Leo Beigelman、Harri Lönnberg
DOI:10.1039/b924321f
日期:——
Ribavirin and 2â²-O-methylcytidine 5â²-phosphoramidates derived from L-alanine methyl ester bearing either an O-phenyl or a biodegradable O-[3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl] or O-[3-(acetyloxymethoxy)-2,2-bis(ethoxycarbonyl)propyl] protecting group were prepared. The kinetics of the deprotection of these pro-drugs by porcine liver esterase and by a whole cell extract of human prostate carcinoma was studied by HPLC-ESI-MS/MS. The 3-(acetyloxymethoxy)-2,2-bis(ethoxycarbonyl)propyl and 3-(acetyloxy)-2,2-bis(ethoxycarbonyl)propyl groups were readily removed releasing the L-alanine methyl ester phosphoramidate nucleotide, the deprotection of the 3-(acetyloxymethoxy) derivative being approximately 20 times faster. The chemical stability of the 2â²-O-methylcytidine pro-drugs was additionally determined over a pH range from 7.5 to 10.
我们合成了以L-丙氨酸甲酯为基础的核糖核酸药物,分别含有O-苯基或可生物降解的O-[3-(乙酰氧基)-2,2-双(乙基碳酸酯)丙基]或O-[3-(乙酰氧基甲氧基)-2,2-双(乙基碳酸酯)丙基]保护基团的利巴韦林和2â²-O-甲基胞苷5â²-磷酰胺盐。通过高效液相色谱-电喷雾质谱/质谱(HPLC-ESI-MS/MS),研究了这些前药在猪肝酯酶和人前列腺癌全细胞提取物中的去保护动力学。3-(乙酰氧基甲氧基)-2,2-双(乙基碳酸酯)丙基和3-(乙酰氧基)-2,2-双(乙基碳酸酯)丙基容易去除,释放出L-丙氨酸甲酯磷酰胺核苷酸,其中3-(乙酰氧基甲氧基)衍生物去保护的速度约为前者的20倍。此外,还在pH范围为7.5到10的条件下确定了2â²-O-甲基胞苷前药的化学稳定性。