AS-924, a Novel Orally Active Bifunctional Prodrug of Ceftizoxime. Synthesis and Relationship between Physicochemical Properties and Oral Absorption.
作者:Masayasu KASAI、Satoru HATANO、Meiko KITAGAWA、Akihisa YOSHIMI、Ken-ichi NISHIMURA、Nobuhiro MORI、Atsushi SAKAI、Taisuke SUGIHARA
DOI:10.1248/cpb.47.1081
日期:——
Ceftizoxime (CZX), a parenteral cephalosporin, has potent and broad antibacterial activity. To improve its oral absorption, we synthesized a series of monofunctional and bifunctional prodrugs of CZX. In rabbits, urinary recovery after oral administration of CZX was improved by esterification of the carboxyl group at the C-4 position with various lipophilic moieties (monofunctional prodrugs), and was further increased by introduciton of a hydrophilic L-alanine to the amino group on the thiazole ring at the C-7 position (bifuncional prodrugs). Least-squares analysis showed good parabolic correlatoins between log P and urinary recovery for monofunctional and bifunctional prodrugs, respectively. AS-924, a bifunctional prodrug with a pivaloyloxymethyl and L-alanyl moiety had the best balance of lipophilicity and water-solubility for oral absorption among the prodrugs synthesized.
头孢唑肟(CZX)是一种具有强效和广谱抗菌活性的非肠道给药头孢菌素。为了改善其口服吸收,我们合成了一系列单功能和双功能CZX前药。在兔子中,通过使用各种亲脂性基团对C-4位羧基进行酯化(单功能前药),可以改善口服给药后CZX在尿液中的回收率,并且通过在C-7位噻二唑环上的氨基引入亲水性L-丙氨酸(双功能前药),回收率进一步增加。最小二乘法分析表明,log P与尿液回收率之间存在良好的抛物线关系,分别对应单功能和双功能前药。AS-924是一种双功能前药,含有特戊酰氧甲基和L-丙氨酰基团,在合成的所有前药中,其在口服吸收方面的亲脂性和水溶性平衡最佳。