Alkylated (hetero) cyclic compounds

A compound selected from those of formula (I):

• ##STR55## in which:
• R.sub.1 represents a group chosen from alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, cycloalkylalkyl, and substituted cycloalkylalkyl,
• A forms, with the benzene ring to which it is attached, a cyclic group chosen from tetrahydronaphthalene, dihydronaphthalene, and naphthalene,
• R.sub.2 represents hydrogen or alkyl,
• R.sub.3 represents:
• a group R.sub.31 :
• ##STR56## with X representing sulfur or oxygen and R.sub.4 representing a group R.sub.41 chosen from alkyl, substituted alkyl, alkenyl, alkynyl, cycloalkyl, substituted cycloalkyl, cycloalkylalkyl, and substituted cycloalkylalkyl,
• or a group of formula (R.sub.32):
• ##STR57## with X' representing sulfur or oxygen and R.sub.5 representing hydrogen or group chosen from alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, cycloalkylalkyl, and substituted cycloalkylalkyl,
• it being understood that in the description of formula (I), and except where otherwise mentioned:
• the term "alkyl" denotes a linear or branched group containing 1 to 6 carbon atoms, inclusive,
• the terms "alkenyl" and "alkynyl" denote linear or branched groups containing 2 to 6 atoms, inclusive,
• the term "cycloalkyl" denotes a group of 3 to 8 carbon atoms, inclusive,
• the term "substituted" associated with the alkyl group means that this group is substituted with one or more substituents chosen from halogen, alkyl, hydroxyl, and alkoxy, containing 1 to 6 carbon atoms, inclusive,
• the term "substituted" associated with the "cycloalkyl" and "cycloalkylalkyl" group means that this group is substituted with one or more groups chosen from halogen, alkyl, and oxo,
• and the enantiomers and diastereoisomers thereof.