Alpha-aminoacyl-penicillins and cephalosporins

A .beta.-lactam compound of the formula ##STR60## in which X represents a radical of the fomula ##STR61## wherein R.sup.5 represents hydrogen, or represents halogen, azido or represents vinyl, 1-propenyl, 1-butenyl or straight-chain, branched or cyclic alkyl which has up to 10 C atoms and is optionally substituted by halogen, alkoxy or alkylthio with in each case up to 8 C atoms, halogenoalkylthio and halogenoalkoxy with in each case up to 8 C atoms, nitro, cyano, an amino group, aryl, SO.sub.3 H, SO.sub.2 NH.sub.2, SO.sub.2 -alkyl with up to 6 C atoms, OH, SH, acyloxy or acylthio with in each case up to 7 C atoms, OCONH.sub.2, carboxyl, alkoxycarbonyl with up to 8 C atoms, phenylthio, benzyloxy and/or benzylthio, by a pyridinium radical, or by a radical of the formula ##STR62## or represents alkoxy or alkylthio with up to 5 C atoms, R.sup.1 represents a radical of the formula ##STR63## which is optionally mono-, di-, tri- or tetra-substituted by halogen, alkyl, alkoxy, alkylthio, halogenoalkyl, halogenoalkoxy or halogenoalkylthio with in each case up to 8 C atoms, nitro, cyano or phenyl,

• wherein
• R.sup.6 and R.sup.7 are identical or different and represent hydrogen, or represent C.sub.6 -C.sub.10 -aryl, or represent an amino group, or represent hydroxyl, or represent alkoxy with up to 8 C atoms, or represent acyl or acyloxy with in each case up to 7 C atoms, or represent alkyl with up to 12 C atoms,
• R.sup.8 and R.sup.9 are identical or different and represent hydrogen, or represent C.sub.6 -C.sub.10 -aryl, or represent heterocyclyl, or represent hydroxyl, or represent an amino group, or represent alkoxy with up to 8 C atoms, or represent acyl with up to 7 C atoms, or represent acyloxy with up to 7 C atoms, or represent alkoxycarbonyl with up to 8 C atoms, or represent alkyl with up to 12 C atoms, or
• R.sup.8 and R.sup.9 together represent the group ##STR64## R.sup.10 and R.sup.11 are identical or different and represent hydrogen, or represent alkyl with up to 12 C atoms, or represent C.sub.6 -C.sub.10 -aryl, or represent alkoxycarbonyl with up to 8 C atoms,
• Y represents oxygen or --N--R.sup.12,
• Z represents oxygen, sulphur or --N--R.sup.13,
• A represents the group ##STR65## and wherein R.sup.12 and R.sup.13 are identical or different and represent hydrogen, or represent C.sub.6 -C.sub.10 -aryl, or represent straight-chain, branched or cyclic alkyl with up to 8 C atoms,
• R.sup.2 represents hydrogen or represents an amino-protective group,
• R.sup.3 represents hydrogen, or represents alkoxy or alkylthio with in each case up to 5 C atoms, or represents an amino group, or represents NHCHO, and
• R.sup.4 represents hydrogen, or represents a carboxyl-protective group, or represents alkali metal ions or ammonium ions, or represents a radical of the formula ##STR66##