摘要 |
Compounds of formula (I) in free or salt form, where A is a C<SUB>6</SUB>-C<SUB>15 </SUB>monovalent aromatic group. R<SUP>1 </SUP>is hydrogen, phenyl optionally substituted by one or more substituents selected from halogen, cyano, hydroxy, C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl, C<SUB>1</SUB>-C<SUB>8</SUB>-haloalkyl, C<SUB>1</SUB>-C<SUB>8</SUB>-alkoxy, C<SUB>1</SUB>-C<SUB>8</SUB>-alkoxy-C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl or acyloxy, or a 5- or 6-membered monovalent heterocyclic group, R<SUP>2 </SUP>is hydrogen, C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl, acyl or CON(R<SUP>3</SUP>)R<SUP>4</SUP>, provided that R<SUP>2 </SUP>is C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl, acyl or CON(R<SUP>3</SUP>)R<SUP>4 </SUP>when R<SUP>1 </SUP>is hydrogen, R<SUP>3 </SUP>and R<SUP>4 </SUP>are each independently hydrogen, or C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl, together with the nitrogen atom to which they are attached denote a 5- or 6-membered heterocyclic group, and Z<SUP>l</SUP>, Z<SUP>2</SUP>, Z<SUP>3 </SUP>and Z<SUP>4 </SUP>are each independently N or CR<SUP>5</SUP>, at least one of them being CR<SUP>5</SUP>, and R<SUP>5 </SUP>is hydrogen, C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl or C<SUB>1</SUB>-C<SUB>8</SUB>-alkoxy. The compounds are useful as adenosine receptor antagonists, particularly in the treatment of inflammatory or obstrucive airways diseases |