Heterocyclic derivatives, preparation method and pharmaceutical compositions containing same
   
   

Compounds of formula (I): ##STR1##

wherein:

    • X represents an oxygen or a sulphur or CH2 or ##STR2##
    • R1 and R2 represent a hydrogen atom, or a group as defined in the description,
    • A represents an alkylene chain as described in the description,
    • B is as defined in the description,
    • R3 and R4 represent a hydrogen atom or a group as defined in the description,
    • D represents an optionally substituted benzene, optionally substituted pyrazine, optionally substituted pyrimidine or optionally substituted pyridazine

      and medicinal products containing the same which are useful in treating or preventing melatoninergic disorders.

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