The present invention is directed to a process for the displacement of the acetoxy group of a cephalosporanic acid by a sulfur nucleophile, in an organic solvent and under essentially anhydrous conditions.
本发明涉及一种在有机溶剂和基本无水条件下,通过硫亲核试剂取代头孢菌酸中的乙酰氧基的过程。
Exploitation of Antibiotic Resistance as a Novel Drug Target: Development of a β-Lactamase-Activated Antibacterial Prodrug
作者:Lindsay E. Evans、Aishwarya Krishna、Yajing Ma、Thomas E. Webb、Dominic C. Marshall、Catherine L. Tooke、James Spencer、Thomas B. Clarke、Alan Armstrong、Andrew M. Edwards
DOI:10.1021/acs.jmedchem.8b01923
日期:2019.5.9
Expression of beta-lactamase is the single most prevalent determinant of antibiotic resistance, rendering bacteria resistant to beta-lactam antibiotics. In this article, we describe the development of an antibiotic prodrug that combines ciprofloxacin with a beta-lactamase-cleavable motif. The prodrug is only bactericidal after activation by beta-lactamase. Bactericidal activity comparable to ciprofloxacin is demonstrated against clinically relevant E. coli isolates expressing diverse beta-lactamases; bactericidal activity was not observed in strains without beta-lactamase. These findings demonstrate that it is possible to exploit antibiotic resistance to selectively target beta-lactamase-producing bacteria using our prodrug approach, without adversely affecting bacteria that do not produce beta-lactamase. This paves the way for selective targeting of drug-resistant pathogens without disrupting or selecting for resistance within the microbiota, reducing the rate of secondary infections and subsequent antibiotic use.
Spry, Douglas O.; Snyder, Nancy J.; Bhala, Anita R., Heterocycles, 1987, vol. 26, # 11, p. 2911 - 2920
作者:Spry, Douglas O.、Snyder, Nancy J.、Bhala, Anita R.、Pasini, Carol E.、Indelicato, Joseph M.