申请人:E. R. Squibb & Sons, Inc.
公开号:US03959259A1
公开(公告)日:1976-05-25
1,2,4-Oxadiazolonylacetyl penicillins and cephalosporins of the general formula ##SPC1## Wherein A is either ##SPC2## R.sub.1 is hydrogen, lower alkyl or phenyl-lower alkyl; R.sub.2 is hydrogen, lower alkyl, phenyl, hydroxyphenyl, thienyl, furyl, or pyridyl; R.sub.3 is hydrogen, lower alkyl, phenyl-lower alkyl, a salt forming ion, trimethylsilyl, benzhydryl, or ##EQU1## R.sub.4 is lower alkyl, phenyl or phenyl-lower alkyl; and X is hydrogen, lower alkoxy, lower alkanoyloxy, lower alkylmercapto, the radical of a nitrogen base, or certain heterocyclic thio moieties; are disclosed. They are useful as antibacterial agents.
公式为##SPC1##的1,2,4-噁二唑酮基乙酰青霉素和头孢菌素,其中A为##SPC2##,R.sub.1为氢,低碳基或苯基-低碳基;R.sub.2为氢,低碳基,苯基,羟基苯基,噻吩基,呋喃基或吡啶基;R.sub.3为氢,低碳基,苯基-低碳基,盐形成离子,三甲基硅基,苯甲基或##EQU1##;R.sub.4为低碳基,苯基或苯基-低碳基;X为氢,低烷氧基,低烷酰氧基,低烷基硫基,氮碱基的基团或某些杂环硫基团。它们用作抗菌剂。