The invention relates to chromene compounds, a process for their preparation and pharmaceutical compositions containing them. The invention relates to the compounds of formula (I), where R1 and R2 together form the carbon chain of formula (II), where: R3 is a hydrogen atom or an alkyl grouping, R4 is a hydrogen atom, an alkyl, aryl, heteroaryl, 3,4-dioxocyclobutenyle, alkylcarbonyl, cycloalkylcarbonyl, heterocycloalkylcarbonyl, benzoyl, arylsulfonyl or heteroarylsulfonyl grouping, each of said groups being optionally substituted, R3 and R4 forming, together with the nitrogen atom having the sane, a ring comprising 5 to 8 members, the thus formed ring being optionally substituted.