Compounds of formula (I) in free or salt form, where Ar is phenyl substituted by one or more substituents selected from halogen, cyano and C1- C8-haloalkyl, or naphthyl, R<1> is hydrogen, phenyl optionally substituted by one or more substituents selected from halogen, cyano, hydroxy, C1-C8-alkyl, C1-C8-haloalkyl, C1-C8-alkoxy, C1-C8-alkoxy-Cl-C8 alkyl, carboxy, C1-C8-alkoxycarbonyl and acyloxy, or R<1> is a 5- or 6- membered monovalent heterocyclic group, R<2> is hydrogen, Cl-C8-alkyl, acyl or -CON(R<3>)R<4>, R<3> and R<4> are each independently hydrogen or C1-Cs-alkyl, or together with the nitrogen atom to which they are attached denote a 5- or 6- membered heterocyclic group, and Y is a pyrimidinyl or pyridazinyl group, optionally substituted by at least one C1-Cs-alkyl, C1-C8-alkoxy, C1-C8-alkylthio, C1-C8-alkyl amino, di(Cl-C8-alkyl) amino or acylamino group. The compounds are useful as pharmaceuticals. |