作者:Jim Iley、Rui Moreira、Teresa Calheiros、Eduarda Mendes
DOI:10.1023/a:1012146905833
日期:——
pathway was mainly affected by the steric bulk of the nitrogen substituents in the amide moiety, the reactivity being reduced with larger N-substituents. Hydrolysis in human plasma appeared to be mediated by enzymic processes and is dependent upon the steric bulk in the carboxylic acid moiety. Plasma hydrolysis rates were inversely dependent on the lipophilicity of the ester. CONCLUSIONS Derivatives containing
目的合成新型叔酰胺基甲基酯,并将其评估为羧酸试剂的潜在前药。方法通过紫外光谱和HPLC研究缓冲溶液和血浆中标题化合物的水解。结果酰胺基甲基酯通过酸催化,碱催化和不依赖pH的途径水解。酸催化的kH +和pH无关的过程ko均受原基中N取代基的电子和空间性质的强烈影响。对于这两个过程,电子效应都产生了较大的影响,并且吸电子取代基阻碍了反应。酰胺基甲酯的非pH依赖性水解取决于羧酸酯离去基团的pKa,得到布朗斯台德的beta(1g)值为-0.91。碱催化的kOH- 该途径主要受酰胺部分中氮取代基的空间体积的影响,反应性随较大的N-取代基而降低。人血浆中的水解似乎是由酶过程介导的,并且取决于羧酸部分中的空间体积。血浆水解速率反过来取决于酯的亲脂性。结论含有马尿酸乙酯载体的衍生物是有用的前药,可用于pKa> 3.5的含羧酸药物,例如非甾体类抗炎药和丙戊酸。血浆水解速率反过来取决于酯的亲脂性。结论含有马尿