The synthesis and the in vitro activity of a number of cephalosporins and 7α-methoxy cephalosporins having 7-acyl substituents derived from 1-methyl-4 (or 5)-nitro-1H-imidazolyl-thioacetic acids are described. The microbiological profile is influenced by the position of both the nitro group and the side-chain sulfur atom on the 1-methyl imidazole, and by the nature of the 3-substituent.
This invention relates to novel 7-thiadiazol-oxyimino-3-cephem and cepham 4-carboxylic acid compounds of high antimicrobial activity.
这项发明涉及具有高抗微生物活性的新型7-噻二唑氧肟基-3-头孢菌素和头孢菌素-4-羧酸化合物。
7-Amino-thiadiazole oxyimino derivatives of cephem and cepham compounds
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04381299A1
公开(公告)日:1983-04-26
This invention relates to new cephem and cepham compounds of high antimicrobial activity, and more particularly to new 7-amino-thiadiazole oxyimino derivatives of cephem and cepham compounds.
7-Amino-thia-diazole oxyimino derivatives of cephem and cephem compounds
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04332798A1
公开(公告)日:1982-06-01
7-Substituted-3-cephem and cepham-4-carboxylic acids of formula (I) ##STR1## wherein R.sup.1 is amino or a protected amino, R.sup.2 is hydrogen, acyl, aryl which may be substituted with suitable substituent(s), lower alkyl substituted with suitable substituent(s), lower alkenyl, lower alkynyl, cycloalkyl which may be substituted with suitable substituent(s), cyclo(lower)alkenyl, or S- or O-containing 5-membered heterocyclic group substituted with oxo group(s). R.sup.3 is hydrogen or lower alkyl, R.sup.4 is hydrogen; acyloxy(lower)alkyl; acylthio(lower)alkyl pyridinium(lower)alkyl which may be substituted with suitable substituent(s); a heterocyclicthio(lower)alkyl which may be substituted with suitable substituent(s); lower alkyl; halogen; or hydroxy; and R.sup.5 is carboxy or a protected carboxy wherein R.sup.5 is COO-- when R.sup.4 is pyridinium(lower)alkyl which may be substituted with suitable substituent(s), and the heavy solid line means single or double bond, have useful antibiotic properties.
Treatments of organic isothiocyanates (R-NCS) with $NaN_3$ in the presence of pyridine in water at room temperature gave corresponding various organic tetrazole-thiones, [$S=CN_4(R)$] (R = alkyl or aryl). Isolated products are obtained as white or yellow solids in good yields (76-97%). The molecular structure by X-ray diffraction study for one of products shows the proposed formation. In addition, one-pot synthesis of 1-substituted 5-alkyl(or aryl)sulfanyltetrazoles has been demonstrated. Addition of alkyl or aryl halides into the mixture of organic isothiocyanates, $NaN_3$, and pyridine in water at room temperature exclusively formed 1-substituted 5-alkyl(or aryl)sulfanyltetrazoles (S-derivatives) in high yields.