Novel coumarin derivatives and the salts thereof, a process for the preparation thereof and their use in the pharmaceutical field

摘要

The present invention relates to novel coumarin derivatives of formula (I) wherein: X=O or S; n=zero, 1, 2, 3 or 4; R5 and R6, which can be the same or different, are optionally unsaturated C1-C4 alkyl groups, or together with the nitrogen atom they form a residue of cyclic amines optionally containing other heteroatoms; R1=CH3 or phenyl; R2 and Rcustom-character file="US20040023893A1-20040205-P00900.TIF" wi="20" he="20" id="custom-character-00001"/4, which can be the same or different, are H, OH, allyl, halogen or methyl.