Substituted pyridines and 2-oxo-1,2-dihydropyridines

A substituted pyridine or 2-oxo-1,2-dihydropyridine of the formula ##STR55## in which A represents a radical of the formula ##STR56## wherein R.sup.1 denotes alkyl having up to 10 carbon atoms, which is optionally substituted by cycloalkyl having 3 to 6 carbon atoms, hydroxyl or by alkoxy or alkylthio having in each case up to 6 carbon atoms, or

• denotes cycloalkyl having 3 to 6 carbon atoms,
• R.sup.2, R.sup.5 and R.sup.6 are identical or different and denote hydrogen, hydroxyl, nitro, cyano, formyl or halogen, or
• denote alkyl, alkenyl, alkinyl, alkoxy or alkylthio having in each case up to 8 carbon atoms, which are optionally substituted up to 3 times in an identical or different manner by hydroxyl, cyano, halogen, carboxyl, alkoxy, acyl or alkoxycarbonyl having in each case up to 6 carbon atoms, or by cycloalkyl having 3 to 6 carbon atoms, benzyl, phenyl, phenoxy, or benzoyl wherein said cyclic radicals are optionally substituted up to 2 times in an identical or different manner by trifluoromethyl, trifluoromethoxy, halogen, nitro, cyano, hydroxyl, hydroxymethyl or by alkyl or alkoxy having in each case up to 6 carbon atoms, or denote acyl or alkoxycarbonyl having in each case up to 8 carbon atoms, phenoxycarbonyl, benzyloxycarbonyl or carboxyl, or
• denote tetrazolyl, which is optionally substituted by triphenylmethyl or by alkyl having up to 6 carbon atoms, which can in turn be substituted by cyano, halogen, carboxyl, phenoxycarbonyl, hydroxyl or by straight-chain or branched alkoxy or alkoxycarbonyl having in each case up to 6 carbon atoms, or
• denote a group of the formula ##STR57## --NR.sup.9 R.sup.10, --CO--NR.sup.11 R.sup.12, --CH.sub.2 --OR.sup.13 or --S(O).sub.a --R.sup.14
• wherein
• R.sup.9, R.sup.10, R.sup.11 and R.sup.12 are identical or different and denote hydrogen, cycloalkyl having 3 to 8 carbon atoms or alkyl having up to 8 carbon atoms, which is optionally substituted by phenyl,
• R.sup.13 denotes acyl having up to 6 carbon atoms or benzoyl,
• R.sup.14 denotes alkyl having up to 8 carbon atoms,
• a denotes a number 1 or 2,
• R.sup.3 and R.sup.7 are identical or different and denote hydrogen, hydroxyl, carboxyl, alkoxy or alkoxycarbonyl having in each case up to 8 carbon atoms, or
• denote a group of the formula --NR.sup.15 R.sup.16,
• wherein
• R.sup.15 and R.sup.16 have the abovementioned meaning of R.sup.9 and R.sup.10 and are identical to or different from these,
• or
• denote aryl having 6 to 10 carbon atoms, which is optionally substituted up to 2 times in an identical or different manner by trifluoromethyl, trifluoromethoxy, halogen, nitro, cyano, hydroxyl, hydroxymethyl or by straight-chain or branched alkyl or alkoxy having in each case up to 6 carbon atoms, or
• denote straight-chain or branched alkyl or alkenyl having in each case up to 8 carbon atoms, which is optionally substituted up to 3 times in an identical or different manner by hydroxyl, cyano, halogen, carboxyl, straight-chain or branched alkoxy, acyl or alkoxycarbonyl having in each case up to 6 carbon atoms, or by cycloalkyl having 3 to 6 carbon atoms, benzyl, phenyl, phenoxy, or benzoyl wherein said cyclic radicals are optionally substituted up to 2 times in an identical or different manner by trifluoromethyl, trifluoromethoxy, halogen, nitro, cyano, hydroxyl, hydroxymethyl or by alkyl or alkoxy having in each case up to 6 carbon atoms,
• R.sup.4 denotes hydrogen, nitro, carboxyl or alkoxycarbonyl having up to 8 carbon atoms, or
• denotes a group of the formula --NR.sup.17 R.sup.18,
• wherein
• R.sup.17 and R.sup.18 have the abovementioned meaning of R.sup.9 and R.sup.10 and are identical to or different from these,
• or
• denotes alkyl or alkenyl having in each case up to 8 carbon atoms, which is optionally substituted up to 3 times in an identical or different manner by hydroxyl, cyano, halogen, carboxyl, straight-chain or branched alkoxy, acyl or alkoxycarbonyl having in each case up to 6 carbon atoms, or by cycloalkyl having 3 to 6 carbon atoms, benzyl, phenyl, or benzoyl, wherein said cyclic radicals are optionally substituted up to 2 times in an identical or different manner by trifluoromethyl, trifluoromethoxy, halogen, nitro, cyano, hydroxyl, hydroxymethyl or by alkyl or alkoxy having in each case up to 6 carbon atoms,
• R.sup.8 has the abovementioned meaning of R.sup.1 and R.sup.4 and is identical to or different from these,
• D represents the ##STR58## group or represents a group of the formula ##STR59## wherein T denotes hydrogen or alkyl having up to 8 carbon atoms,
• E represents hydrogen, halogen, cyano, nitro, trifluoromethyl, hydroxyl, trifluoromethoxy or amido, or represents alkyl, alkoxy or alkoxycarbonyl having in each case up to 6 carbon atoms,
• L represents a radical of the formula ##STR60## wherein R.sup.19 has the abovementioned meaning of E and is identical to or different from this,
• and
• R.sup.20 denotes a radical of the formula ##STR61## wherein R.sup.28 denotes hydrogen or straight-chain or branched alkyl having up to 8 carbon atoms, which is optionally substituted by acyl having up to 6 carbon atoms, or denotes the triphenylmethyl group,
• or a salt thereof, the compound having at most three tetrazole groups.