Compounds are disclosed of formula (I)
wherein
R₁ represents -COR₄, -CO₂R₄, -COCO₂R₄ or -CONR₄R₅(where R₄ and R₅ may be the same or different and represent a hydrogen atom or a C₁₋₃alkyl group);
R₂ represents a hydrogen atom or a hydroxy or oxo group, with the proviso that when R₁ is -COR₄, -CO₂R₄ or -COCO₂R₄, R₂ is not a hydrogen atom;
R₃ represents a hydrogen atom or a hydroxy group;
X represents a direct bond, -CH₂- or -CH₂O-;
Ar represents a substituted phenyl moiety;
and physiologically acceptable salts thereof.
The compounds are indicated as useful in the treatment of pain.
Processes for their preparation and pharmaceutical compositions containing them are also disclosed.
Compounds are disclosed of formula (I) ##STR1## wherein R.sub.1 represents --COR.sub.4, --CO.sub.2 R.sub.4, --COCO.sub.2 R.sub.4 or --CONR.sub.4 R.sub.5 (where R.sub.4 and R.sub.5 may be the same or different and represent a hydrogen atom or a C.sub.1-3 alkyl group); R.sub.2 represents a hydrogen atom or a hydroxy or oxo group, with the proviso that when R.sub.1 is --COR.sub.4, --CO.sub.2 R.sub.4 or --COCO.sub.2 R.sub.4, R.sub.2 is not a hydrogen atom; R.sub.3 represents a hydrogen atom or a hydroxy group; X represents a direct bond, --CH.sub.2 -- or --CH.sub.2 O--; Ar represents a substituted phenyl moiety; and physiologically acceptable salts thereof. The compounds are indicated as useful in the treatment of pain. Processes for their preparation and pharmaceutical compositions containing them are also disclosed.