Studies on orally active cephalosporin esters. V. A prodrug approach for oral delivery of 3-thiazoliomethyl cephalosporin.
作者:Masao MIYAUCHI、Eiji NAKAYAMA、Koichi FUJIMOTO、Isao KAWAMOTO、Junya IDE
DOI:10.1248/cpb.38.1906
日期:——
administered orally to mice, these derivatives were mainly transformed to a novel 3-spiro cephalosporin 11, and desired reconversion to the 3-thiazoliomethyl cephalosporin was minor. Isomerization to delta 2-cephalosporin 14 was also observed. These results showed that the derivatives (8-10) tested in this study did not serve as orally active prodrugs of 3-thiazoliomethyl cephalosporin 1.
通过使用硫胺素化学的前药方法尝试口服递送3-噻唑啉甲基头孢菌素1。将3-噻唑基甲基改性为没有离子电荷的开环结构,并将4-羧基转化为新戊酰氧基甲基酯。所得衍生物(8-10)的亲脂性适合从肠道被动吸收,在磷酸盐缓冲液(pH 6.86)中的化学稳定性中等。当对小鼠口服给药时,这些衍生物主要被转化为新型的3-螺头孢菌素11,并且向3-噻唑基甲基头孢菌素的期望转化很小。还观察到异构化为δ2-头孢菌素14。