Imidazo-, pyrazolopyrazines and imidazotriazines and their use

A compound of the formula

• in which
• U represents CH,
• represents CR12,
• W represents N,
• A represents CR15,
• where
• R12 represents hydroxycarbonyl, C1-C4-alkoxycarbonyl, or —CH2R13,
• and
• where
• R13 represents morpholinyl,
• R15 represents hydrogen,
• R1 represents a group of the formula
• where
• * is the point of attachment to the heterocycle, and
• R3 represents 2-pyridyl, 1,3-thiazol-2-yl, 1,3-thiazol-4-yl, or 1H-1,2,4-triazol-5-yl,
• where 2-pyridyl, 1,3-thiazol-2-yl and 1,3-thiazol-4-yl are substituted by 1 or 2 substituents, where the substituents independently of one another are selected from the group consisting of halogen, cyano, nitro, amino, trifluoromethyl, trifluoromethoxy, aminocarbonyl, trifluoromethylcarbonyl, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-alkylamino, C3-C4-cycloalkylamino, C1-C4-alkylcarbonyl, C1-C4-alkoxycarbonyl, C1-C4-alkylaminocarbonyl and C3-C6-cycloalkylcarbonyl,
• where alkyl, alkoxy, alkylamino, alkylcarbonyl, alkoxycarbonyl, alkylaminocarbonyl and cycloalkylcarbonyl may be substituted by a substituent, where the substituent is selected from the group consisting of halogen, cyano, hydroxyl, amino, trifluoromethyl and C3-C6-cycloalkyl,
• and
• where 1H-1,2,4-triazol-5-yl, may be substituted by a substituent, where the substituent is selected from the group consisting of halogen, cyano, nitro, amino, trifluoromethyl, trifluoromethoxy, aminocarbonyl, trifluoromethylcarbonyl, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-alkylamino, C3-C4-cycloalkylamino, C1-C4-alkoxycarbonyl, C1-C4-alkylaminocarbonyl and C3-C6-cycloalkylcarbonyl,
• R2 represents phenyl,
• where phenyl may be substituted by 1 to 3 halogen substituents,
• or one of its salts.