The present invention relates to novel antagonists of the A2B
adenosine receptor and pharmaceutical compositions comprising said antagonists as well as their uses for the treatment and prevention of disorders known to be susceptible to improvement by
antagonism of the A2B
receptor such as
asthma, chronic obstructive pulmonary disorder (
COPD),
pulmonary fibrosis, vascular diseases, allergic diseases, hypertension,
retinopathy,
diabetes mellitus, inflammatory
gastrointestinal tract disorders, inflammatory diseases, autoimmune diseases, renal diseases, neurological disorders and, in particular, cancers.In particular, the present invention relates to compounds of formula IwhereinR1 represents 1 to 3 identical or different R1 substituents, wherein said R1 is independently at each occurrence selected from
hydrogen,
halogen, C1-C8
alkyl, C1-C8haloalkyl, C1-C8alkoxy, C1-C8hydroxyalkyl and C1-C8alkoxyalkyl; Ra is selected from phenyl, pyridinyl, pyrimidinyl, thiazolyl, thiodiazolyl, oxazolyl, pyrazolyl and triazolyl wherein said phenyl, pyridinyl, thiazolyl, thiodiazolyl, oxazolyl, pyrazolyl and triazolyl is independently optionally substituted by one or more substituents independently selected from
halogen, hydroxyl, cycloalkyl, C1-C4
alkyl-substituted cycloalkyl, C1-C8
alkyl, C1-C8haloalkyl, C1-C8alkoxy, C1-C8alkylaminocarbonyl, C1-C8hydroxyalkyl, C1-C8dialkylaminoC1-C8alkyl, C1-C8aminoalkyl and a heterocycle selected from oxiran,
oxetane,
aziridine and
azetidine wherein said oxiran,
oxetane,
aziridine and
azetidine are independently optionally substituted by
halogen, hydroxyl, C1-C4alkyl, C1-C2haloalkyl, C1-C2alkoxy; or Ra is —CONHR′ wherein R′ is selected from C1-C8alkyl, cycloalkyl,
aryl, heteroaryl and C1-C8alkyl-N-
morpholino, wherein said
aryl, heteroaryl and C1-C8alkyl-N-
morpholino is independently optionally substituted by [one or more] substituents selected from halogen, cycloalkyl, C1-C8alkyl, C1-C8alkoxy, C1-C8hydroxalkyl and C1-C8alkoxyalkyl;Ar / Het is selected from pyridinyl, phenyl and oxazolyl wherein said pyridinyl, phenyl and oxazolyl is independently optionally substituted by one or more substituents independently selected from halogen, cyano, C1-C8alkyl, C1-C8haloalkyl, C1-C8alkoxy, C1-C8hydroxyalkyl and C1-C8alkoxyalkyl;or pharmaceutically acceptable salt, or
hydrate thereof.