申请人:Ciba-Geigy Corporation
公开号:US04405778A1
公开(公告)日:1983-09-20
The invention relates to O-substituted 7.beta.-amino-3-cephem-3-ol-4-carboxylic acid compounds of the formula ##STR1## wherein R.sub.1.sup.a represents hydrogen or an amino protective group R.sub.1.sup.A and R.sub.1.sup.b represents hydrogen or an acyl group Ac, or R.sub.1.sup.a and R.sub.1.sup.b together represent a bivalent amino protective group, R.sub.2 represents hydroxyl or a radical R.sub.2.sup.A which together with the carbonyl grouping --C(.dbd.O)-- forms a protected carboxyl group and R.sub.3 represents an optionally substituted hydrocarbon radical or an acyl group, and to 1-oxides of 3-cephem compounds of the formula I, and also to the corresponding 2-cephem compounds of the formula ##STR2## wherein R.sub.1.sup.a, R.sub.1.sup.b, R.sub.2 and R.sub.3 have the abovementioned meanings, or salts of such compounds with salt-forming groups. 3-Cephem compound of the formula IA, particularly those, in which R.sub.1.sup.a represents an acyl group, R.sub.1.sup.b is hydrogen and R.sub.2 is hydroxy exhibit pronounced antimicrobial effects, the others, and particularly the 1-oxides of these 3-cephem compounds and the corresponding 2-cephem compounds are useful as intermediates.
本发明涉及公式为:##STR1##的O-取代7-β-氨基-3-头孢烷-3-醇-4-羧酸化合物,其中R1a代表氢或氨基保护基R1A,R1b代表氢或酰基Ac,或R1a和R1b一起代表双价氨基保护基,R2代表羟基或与羰基--C(.dbd.O)--一起形成保护羧基的基团R2A,R3代表可选的取代的碳氢基团或酰基,以及公式I的3-头孢烷化合物的1-氧化物,以及相应的公式为:##STR2##的2-头孢烷化合物,其中R1a、R1b、R2和R3具有上述含义,或具有盐形成基团的这些化合物的盐。特别是,当R1a代表酰基,R1b为氢,R2为羟基时,公式IA的3-头孢烷化合物表现出明显的抗微生物作用,其他化合物,特别是这些3-头孢烷化合物的1-氧化物和相应的2-头孢烷化合物可用作中间体。