Compounds of formula I in which R1 is 1-4C-alkyl, 3-7C-cycloalkyl, 2-4C-alkenyl, 2-4C-alkinyl, 3-7C-cycloalkyl-1-4C-alkyl, or 2-7C-alkyl substituted by R11, in which R11 is -N R112, or halogen, in which R111 is hydrogen, 1-4C-alkyl, 2-4C-alkenyl, 2-4C-alkinyl, 3-7C-cycloalkyl, 3-7C-cycloalkyl-1-4C-alkyl, hydroxy-2-4C-alkyl, 1-4C-alkoxy-2-4C-alkyl, 1N-(1-4C-alkyl)-pyrazolyl, 1N- -pyrazolyl, isoxazolyl, or completely or partially fluorine-substituted 1-4C-alkyl, R112 is hydrogen, 1-4C-alkyl, 3-7C-cycloalkyl, or 3-7C-cycloalkyl-1-4C-alkyl, or R111 and R112 together and with inclusion of the nitrogen atom, to which they are bonded, form a ring Het, in which Het is piperidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl, S-oxo-thiomorpholin-4-yl, S,S-dioxo-thio-morpholin-4-yl, pyrrolidin-1-yl, azetidin-1-yl, homopiperidin-1-yl, 4N- -piperazin-1-yl, 4N- -homopiperazin-1-yl, 2,5-dihydro-pyrrol-1-yl, 1,2,3,6-tetrahydropyridin-1-yl, pyrrol-1-yl, pyrazol-1-yl, imidazol-1-yl, triazol-1-yl, or tetrazol-1-yl, in which R113 is hydrogen, 1-4C-alkyl, 3-7C-cycloalkyl, 3-7C-cycloalkyl-1-4C-alkyl, 1-4C-alkylcarbonyl, amidino, or completely or partially fluorine-substituted 1-4C-alkyl, wherein said Het may be optionally substituted by one or two substituents independently selected from fluorine and 1-4C-alkyl, R2 is hydrogen, 1-4C-alkyl, halogen, trifluoromethyl, 1-4C-alkoxy or hydroxyl, R3 is hydrogen, 1-4C-alkyl, halogen, trifluoromethyl or 1-4C-alkoxy, R4 is 1-4C-alkyl, 3-7C-cycloalkyl or 3-7C-cycloalkyl-1-4C-alkyl, R5 is 1-4C-alkyl, halogen, 1-4C-alkoxy, trifluoromethyl, cyano, hydroxyl, phenyl-1-4C-alkoxy, 1-4C-alkoxy-2-4C-alkoxy, hydroxy-2-4C-alkoxy, 3-7C-cycloalkoxy, 3-7C-cycloalkyl-1-4C-alkoxy, or completely or predominantly fluorine-substituted 1-4C-alkoxy, R6 is hydrogen, 1-4C-alkyl or halogen, and the salts, solvates, stereoisomers and the salts of the stereoisomers of these compounds, and the solvates of the salts, stereoisomers, and the salts of the stereoisomers of these compounds. R1 is 1-4C-alkyl, 3-7C-cycloalkyl, 2-4C-alkenyl, 2-4C-alkinyl, 3-7C-cycloalkyl-1-4C-alkyl, or 2-7C-alkyl substituted by R11, in which R11 is -N R112, or halogen, in which R111 is hydrogen, 1-4C-alkyl, 2-4C-alkenyl, 2-4C-alkinyl, 3-7C-cycloalkyl, 3-7C-cycloalkyl-1-4C-alkyl, hydroxy-2-4C-alkyl, 1-4C-alkoxy-2-4C-alkyl, 1N-(1-4C-alkyl)-pyrazolyl, 1N- -pyrazolyl, isoxazolyl, or completely or partially fluorine-substituted 1-4C-alkyl, R112 is hydrogen, 1-4C-alkyl, 3-7C-cycloalkyl, or 3-7C-cycloalkyl-1-4C-alkyl, or R111 and R112 together and with inclusion of the nitrogen atom, to which they are bonded, form a ring Het, in which Het is piperidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl, S-oxo-thiomorpholin-4-yl, S,S-dioxo-thio-morpholin-4-yl, pyrrolidin-1-yl, azetidin-1-yl, homopiperidin-1-yl, 4N- -piperazin-1-yl, 4N- -homopiperazin-1-yl, 2,5-dihydro-pyrrol-1-yl, 1,2,3,6-tetrahydropyridin-1-yl, pyrrol-1-yl, pyrazol-1-yl, imidazol-1-yl, triazol-1-yl, or tetrazol-1-yl, in which R113 is hydrogen, 1-4C-alkyl, 3-7C-cycloalkyl, 3-7C-cycloalkyl-1-4C-alkyl, 1-4C-alkylcarbonyl, amidino, or completely or partially fluorine-substituted 1-4C-alkyl, R2 is hydrogen, 1-4C-alkyl, halogen, trifluoromethyl, 1-4C-alkoxy or hydroxyl, R3 is hydrogen, 1-4C-alkyl, halogen, trifluoromethyl or 1-4C-alkoxy, R4 is 1-4C-alkyl, 3-7C-cycloalkyl or 3-7C-cycloalkyl-1-4C-alkyl, R5 is 1-4C-alkyl, halogen, 1-4C-alkoxy, trifluoromethyl, cyano, hydroxyl, phenyl-1-4C-alkoxy, 1-4C-alkoxy-2-4C-alkoxy, hydroxy-2-4C-alkoxy, 3-7C-cycloalkoxy, 3-7C-cycloalkyl-1-4C-alkoxy, or completely or predominantly fluorine-substituted 1-4C-alkoxy, R6 is hydrogen, 1-4C-alkyl or halogen,