Syntheses and hydrolysis of basic and dibasic ampicillin esters tailored for intracellular accumulation
作者:Isabelle Paternotte、Hua Juan Fan、Pascal Scrève、Michel Claesen、Paul M Tulkens、Etienne Sonveaux
DOI:10.1016/s0968-0896(00)00255-8
日期:2001.2
Readily hydrolysable basic and dibasicesters of ampicillin were synthesised by alkylation of the carboxylate function of ampicillin to obtain prodrugs that may accumulate in cells and allow for an intracellular delivery of ampicillian (Fan et al., Bioorg. Med. Chem. Lett. 1997, 7, 3107). We found that the beta-lactam ring cleavage and the hydrolysis of the ester function were competitive reactions
Seven new ester prodrugs of ampicillin with hydrolysis half-lives ranging from 65 to 308 min were synthesized. The cellular accumulation of two of them (in J774 mouse macrophages) and their activities against intracellular Staphylococcus aureus were determined in comparison with the pivaloyloxymethylester of ampicillin (pivampicillin) and ampicillin. The esters accumulated extensively and were more active than ampicillin in this in vitro system. (C) 1997 Elsevier Science Ltd.