Pyrazine derivatives useful as adenosine receptor antagonists

摘要

The present invention provides a compound of formula (I) wherein: A represents an optionally substituted monocyclic or polycyclic aryl or heteroaryl group B represents an optionally substituted monocyclic nitrogen-containing heteroaryl group; and either a) R1 and R2 represent hydrogen or specified substituents, or b) R2, R1 and the —NH— group to which R1 is attached, form a moiety selected from the moiety of formulae (IIa) and (IIb): (IIa) These compounds are useful as antagonists of the A2B receptor, for instance in the treatment of asthma.