| 摘要 |
There are disclosed novel antibacterial compounds having the formula <IMAGE> wherein R is hydrogen, lower alkyl, lower alkenyl, lower alkynyl, cyclo lower alkyl, aryl of 6-12 carbon atoms, all the said foregoing groups being optionally substituted with carboxy, lower alkoxycarbonyl, phenoxycarbonyl, amino, mono- or di-lower alkyl substituted amino, hydroxy, lower alkoxy, phenoxy, carbamoyl, lower alkyl carbonyl, benzoyl, cyano, nitro, formamido, lower alkanoylamino or benzamido; R1 is hydrogen, lower alkyl or an alkali metal cation; A is <IMAGE> R2 and R3 are each individually lower alkyl, carboxy, lower alkoxycarbonyl, phenoxycarbonyl, amino, mono- or di-lower alkyl substituted amino, hydroxy, lower alkoxy, phenoxy, carbamoyl, mono- or di-lower alkyl substituted cabamoyl, lower alkylcarbonyl, benzoyl, cyano, nitro, lower alkanolyamino or benzamido; m=0-1; n=0-1; B represents <IMAGE> or a 5- or 6-membered unsaturated aza-, diaza-, triaza-, tetraza-, thia-, thiaza-, oxathia-, oxathiaza-, oxa-, dioxa-, oxaza- or, oxadiazacyclic moiety; and the dotted line denotes an optional double bond.
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