160032-75-7Relevant academic research and scientific papers
7-alkylidenecephalosporin esters as inhibitors of human leukocyte elastase
Buynak, John D.,Srinivasa Rao,Ford, George P.,Carver, Christa,Adam, Greg,Geng, Bolin,Bachmann, Brian,Shobassy, Samir,Lackey, Stephanie
, p. 3423 - 3433 (2007/10/03)
A series of 7-alkylidenecephalosporins and 7-vinylidenecephalosporins, as their benzhydryl esters, have been tested as inhibitors of both porcine pancreatic elastase and human leukocyte elastase. Selected 7- alkylidenecephalosporin esters are found to be potent inhibitors of HLE. One category of new inhibitors is the 7-(haloalkylidene)cephalosporins. In contrast to previously reported cephalosporin-based elastase inhibitors, these haloalkylidene cephems show optimum inhibitory activity as sulfides, rather than as sulfones. They are efficient and irreversible inhibitors. A second class of active compounds is represented by the benzhydryl ester 7- (cyanomethylidene)cephalosporin sulfone. In contrast to the activity of these new inhibitors, the benzhydryl ester of the mechanism-based β-lactamase inhibitor, 7-[(2'-pyridyl)methylidene]-cephalosporin sulfone showed little inhibitory activity as an elastase inhibitor. 7-Vinylidenecephalosporins were also relatively poor inhibitors, although the terminally unsubstituted allene sulfide showed activity as an inhibitor of PPE. A modeling analysis suggests the 7-alkylidene substituents can be readily accommodated in the S1 pocket. A potential mechanism of inhibition is proposed.
Synthesis and mechanistic evaluation of 7-vinylidenecephem sulfones as β-lactamase inhibitors
Buynak, John D.,Khasnis, Dipti,Bachmann, Brian,Wu, Kuangcong,Lamb, Grady
, p. 10955 - 10965 (2007/10/02)
Representative 7-vinylidenecephalosporins 1 were synthesized from 7-aminocephalosporanic acid and were biologically evaluated as β-lactamase inhibitors. These chiral allenes were prepared stereospecifically from a cephalosporin-derived propargylic triflat
