Compounds selected from the group No. Name and/or structure "A5" 2-[4-(3-fluorophenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A6" 2-[4-(4-fluorophenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A8" 2-[4-(4-chlorophenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A9" 2-[4-(2-chlorophenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A10" 2-(4-trifluoromethylpiperidin-1-yl)-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A11" 2-[4-(3-chlorophenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A13" 2-(4-tert-butylpiperazin-1-yl)-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A14" 2-[4-(4-methoxyphenyl)-3-oxopiperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A15" 2-[4-(piperidine-1-carbonyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A16" 2-[4-(6-hydroxypyridin-2-yl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A18" N-pyridin-2-yl-2-[4-(4-oxo-3,4,5,6,7,8-hexahydroquinazolin-2-yl)piperazin-1-yl]acetamide "A19" 2-(4-acetylpiperazin-1-yl)-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A20" 2-[4-(morpholine-4-carbonyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A21" 2-[4-(3-aminopropanoyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A22" 2-[4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazin-1-yl]pyridine-3-carboxamide "A23" 2-[4-(4-oxo-3,4,5,6,7,8-hexahydroquinazolin-2-yl)piperazin-1-yl]-N-pyridin-3-ylacetamide "A24" 2-[4-(2,2-dimethylpropanoyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A25" 2-[4-(2-hydroxyethyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A26" 2-[4-[2-(2-pyridyl)ethyl]piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A27" 2-[4-(piperidine-2-carbonyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A28" 4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazine-2-carboxamide "A29" 2-[3-(hydroxymethyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A30" -1-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazine-2-carboxamide "A31" 2-[ -2-(hydroxymethyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A32" 2-[4-(3-pyridyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A33" 2-[4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazin-1-yl]benzonitrile "A34" 2-[4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazin-1-yl]benzamide "A35" 2-(4-hydroxy-4-phenyl-1-piperidyl)-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A36" 2-[4-(4-fluoro-2-methoxy-phenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A37" 2-[4-(2,4-dimethoxyphenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A38" 2-[4-(2-chloro-4-methoxy-phenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A39" 2-[4-(2-chloro-4-fluoro-phenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A40" 2-[4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazin-1-yl]acetamide "A41" 2-(3-phenylpiperazin-1-yl)-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A42" 2-[4-(2-isopropoxyphenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A43" 2-[4-[2-(trifluoromethoxy)phenyl]piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A44" 2-[4-(6-methoxypyridazin-3-yl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A45" 4-[4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazin-1-yl]benzonitrile "A46" 2-[4-[4-(4-oxo-5,6,7,8-tetrahydro-3H-quinazolin-2-yl)piperazin-1-yl]phenyl]acetonitrile "A47" 2-[4-[4-(trifluoromethoxy)phenyl]piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A48" 2-[4-(4-ethoxyphenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A49" 2-[4-(4-isopropoxyphenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A50" 2-[4-(4-trifluoromethylphenyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A51" 2-[4-(6-methoxy-3-pyridyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A52" 2-[4-(5-methoxy-2-pyridyl)piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A53" 2-[4-hydroxy-4-(4-methoxy-phenyl)-piperidin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A54" 2-[4-(2-methoxy-phenyl)-piperidin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A55" 2-[4-(4-methoxy-phenyl)-piperidin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A56" 2-[4-(2-trifluoromethyl-phenyl)-piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one "A57" 2-[4-[2-(1-hydroxy-1-methyl-ethyl)phenyl]piperazin-1-yl]-5,6,7,8-tetrahydro-3H-quinazolin-4-one and pharmaceutically acceptable solvates, salts, tautomers and stereoisomers thereof, including mixtures thereof in all ratios.