Synthesis and structure-activity relationship of new cephalosporins with amino heterocycles at C-7. Dependence of the antibacterial spectrum and .beta.-lactamase stability on the pKa of the C-7 heterocycle
作者:F. Jung、C. Delvare、D. Boucherot、A. Hamon、N. Ackerley、M. J. Betts
DOI:10.1021/jm00107a035
日期:1991.3
Cephalosporins with new aminobenzimidazole and aminoimidazoline heterocycles at C-7 have been synthesized starting with versatile C-7 isocyanide dihalide synthons. The aminobenzimidazoles have a broad spectrum of antibacterial activity, including Gram-positive and Gram-negative organisms, but possess limited beta-lactamase stability. In contrast, the aminoimidazolines have a narrow spectrum of antibacterial activity, limited to Gram-negative strains only, but possess outstanding beta-lactamase stability. Structure-activity relationships are discussed in terms of their dependence on the pK(a) of the C-7 amino heterocycle, basic C-7 residues giving cephalosporins with exceptional beta-lactamase stability.
JOSHUA A. V.; SCOTT J. R.; SOUDHI S. M.; BALL R. G.; LOWN J. W., J. ORG. CHEM., 52,(1987) N 12, 2447-2451
作者:JOSHUA A. V.、 SCOTT J. R.、 SOUDHI S. M.、 BALL R. G.、 LOWN J. W.