PROCESSO PARA PREPARACAO DE DERIVADOS DO BENZENO, ACTIVOS SOBRE O SISTEMA IMUNITARIO

The invention relates to compounds of formula: in which: - R1 represents a hydrogen atom or a halogen atom; - R2 represents a cyclohexyl or a phenyl; - R3 represents a cycloalkyl containing from 3 to 6 carbon atoms; - R4 represents a hydrogen atom, an alkyl containing from 1 to 6 carbon atoms or a cycloalkyl containing from 3 to 6 carbon atoms; - A represents a group chosen from: -CO-CH2-, -CH(Cl)-CH2-, -CH(OH)-CH2-, -CH2-CH2-, -CH = CH-, -C IDENTICAL C-; as well as their addition salts with inorganic or organic acids. These compounds possess activity with respect to the immune system. The invention also relates to a process for preparing the abovementioned compounds and to pharmaceutical compositions containing them.