| 摘要 |
Novel hydantoin compounds are described of the formula (I): <IMAGE> (I) wherein Ar is phenyl optionally substituted by up to three radicals selected from the group comprising C1-6 alkoxy, halogen, 1,3-dioxol-2-yl, hydroxy C1-4 alkoxy C1-4 alkyl, phenyl, hydroxyl, nitrile, C1-4 haloalkyl, C1-4 alkyl, C2-4 alkenyloxy, C1-4 alkoxycarbonyl or phenoxy optionally substituted by C1-4 haloalkyl, C1-4 alkoxy or halogen; or is thiophene optionally substituted by phenyl or by one or two C1-4 alkyl groups; R1 and R2 are independently hydrogen or taken together represent a chemical bond; R3 is hydrogen, C1-6 alkyl or C2-4 alkenyl; and R4 is C1-6 alkyl, C2-4 alkenyl, phenyl or benzyl; provided that R3 cannot be hydrogen when Ar is unsubstituted phenyl and R4 is n-butyl. The compounds are useful in the treatment of immediate hypersensitivity diseases including asthma. |
