2-heteroarylcarboxylic acid amides

A method for treating a cognitive impairment in a patient suffering from Alzheimer's disease or schizophrenia, the method comprising administering to a patient a therapeutically effective amount a compound of formula (I):

• wherein
• R1 represents 1-azabicyclo[2.2.2]oct-3-yl,
• R2 represents hydrogen or C1-C6-alkyl,
• R3 represents hydrogen, halogen or C1-C6-alkyl,
• A represents oxygen or sulfur,
• and
• the ring B represents benzo, pyrimido, pyrimidazo or pyridazino which is substituted by a radical selected from the group consisting of halogen, C1-C6-alkanoyl, carbamoyl, cyano, trifluoromethyl, trifluoromethoxy, nitro, amino, C1-C6-acylamino, C1-C6-alkyl, C1-C6-alkyoxy, C1-C6-alkylthio, C1-C6-alkylamino, heteroarylcarbonylamino, arylcarbonylamino, C1-C6-alkylsulfonyl-amino, di(C1-C4-alkylsulfonyl)amino, arylsulfonylamino, di(arylsulfonyl)amino, C3-C6-cycloalkylcarbonylmethyl, 1,3-dioxa-propane-1,3-diyl, amino(hydroxyimino)methyl and benzo,
• or a salt, a hydrate or a hydrate of a salt thereof.