1,2,3,4-tetrahydronaphthalene compounds

A compound of formula (I):

• ##STR33## in which:
• R.sub.1 and R.sub.2, which may be identical or different, represent hydrogen, but not simultaneously when X=CH.sub.2, halogen, linear or branched (C.sub.1 -C.sub.6) alkyl, phenyl which is unsubstituted or substituted with one or more halogen or linear or branched (C.sub.1 -C.sub.6) alkyl or linear or branched (C.sub.1 -C.sub.6) alkoxy or trihalomethyl or benzyl, pyridylmethyl or imidazolylmethyl, thiazolylmethyl, pyridyl, imidazolyl, or thiazolyl, or alternatively,
• R.sub.1 and R.sub.2 form, with the carbon atoms to which they are attached, a cyclopentane or cyclohexane ring,
• R.sub.3 represents hydroxyl, linear or branched (C.sub.1 -C.sub.6) alkoxy or amino which is unsubstituted or substituted with one or two linear or branched (C.sub.1 -C.sub.6) alkyl,
• R.sub.4 represents linear or branched (C.sub.1 -C.sub.6) alkyl, phenyl which is unsubstituted or substituted with one or more halogen or linear or branched (C.sub.1 -C.sub.6) alkyl, linear or branched (C.sub.1 -C.sub.6) alkoxy, trihalomethyl or hydroxyl, naphthyl, pyridyl, thienyl, or thiazolyl,
• X represents methylene or oxygen or sulfur,
• their enantiomers or their addition salts with a pharmaceutically-acceptable base.