DIHYDROPYRIDINELACTOLS, PROCESSES FOR THEIR PREPARATION AND THEIR USE AS MEDICAMENTS

Reducing blood sugar with the novel dihydropyridinelactols, or salts thereof, of the formula in which R1 represents a phenyl, naphthyl, thienyl, pyridyl, chromonyl, thiochromonyl or thiochromenyl radical, the stated radicals optionally containing 1 or 2 identical or different substituents from the group consisting of fluorine, chlorine and bromine, alkyl, alkoxy and alkylthio, each having 1 to 6 carbon atoms, and fluoroalkyl or fluoroalkoxy, each having up to 3 carbon atoms and 3 fluorine atoms, and nitro and cyano, R2 represents a straight-chain, branched or cyclic alkyl having up to 12 carbon atoms which is optionally inte rupted by 1 or 2 oxygen or sulphur atoms and which is optionally substituted by fluorine, chlorine, phenyl, cyano, hydroxyl, amino, C1-C3-alkylamino, di-C1-C3-alkylamino or N-benzylmethylamino, R3 represents cyano or straight-chain or branched alkyl which has up to 4 carbon atoms and is optionally interrupted in the chain by N-C1-C3-alkyl and/or oxygen, and R4 represents straight-chain, branched or cyclic alkyl which has up to 6 carbon atoms and is optionally interrupted by 1 or 2 oxygen atoms and is substituted by one or more radicals from amongst fluorine, chlorine, hydroxyl, phenyl, amino, carboxyl and C1-C4-alkoxycarbonyl.