Thiazole derivatives as A2B antagonists

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, R1 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-C1-C8 alkyl, carboxy, C1-C8-alkoxycarbonyl and acyloxy, or R1 is a 5- or 6-membered monovalent heterocyclic group, R2 is hydrogen, C1-C8-alkyl, acyl or -CON(R3)R4, R3 and R4 are each independently hydrogen or C1-C8-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-C8-alkyl, C1-C8-alkoxy, C1-C8-alkylthio, C1-C8-alkyl amino, di(C1-C8-alkyl) amino or acylamino group. The compounds are useful as pharmaceuticals.