Abstract: The present invention relates to certain spiro-azacyclic derivatives which are tachykinin antagonists and are useful, for example, in the treatment or prevention of pain, inflammation, migraine, emesis and postherpetic neuralgia.

Abstract: The present invention relates to compounds of formula (I), wherein R.sup.1 and R.sup.4 represent hydrogen, halogen, C.sub.1-6 alkyl, C.sub.2-6 alkenyl, C.sub.2-6 alkynyl, C.sub.3-7 cycloalkyl, C.sub.3-7 cycloalkylC.sub.1-4 alkyl, C.sub.1-6 alkoxy, C.sub.1-4 alkyl substituted by a hydroxy or C.sub.1-4 alkoxy group, OCF.sub.3, hydroxy, trifluoromethyl, trimethylsilyl, nitro, CN, SR.sup.a, SOR.sup.a, SO.sub.2 R.sup.a, COR.sup.a, CO.sub.2 R.sup.a or CONR.sup.a R.sup.b, where R.sup.a and R.sup.b are each independently hydrogen or C.sub.1-4 alkyl; R.sup.2, R.sup.3 and R.sup.5 represent hydrogen, halogen, C.sub.1-6 alkyl, C.sub.1-4 alkoxy substituted by a C.sub.1-4 alkoxy group, or trifluoromethyl; R.sup.6 represents C.sub.1-6 alkyl, optionally substituted by oxo, substituted by a 5-membered heteroaromatic ring selected from oxazole, thiazole, isoxazole, isothiazole, oxadiazole and thiadiazole, wherein each heteroaromatic ring is substituted at the available carbon atom by a group of the formula: ZNR.sup.7 R.sup.8.

Abstract: The present invention relates to compounds of formula (I): wherein X is N or CH; and pharmaceutically acceptable salts and prodrugs thereof. The compounds are of p articular use in the treatment of pain, inflammation, migraine and emesis.