New derivatives of flavones, their process for the preparation and pharmaceutical compositions containing them

Compounds of general formula (I) (CF DRAWING IN BOPI) wherein - R1 represents an alkyl radical, - X represents oxygen, -CHR ' - or CR '=, - R' is selected from hydrogen and an alkyl, - R2 represents an optionally substituted alkyl radical, as defined herein, a cycloalkyl radical or a radical polycycloalkyl, as defined in the description, - R3 is hydrogen or hydroxy, - Alk represents an alkylene radical, and - Y is as defined in the description, and therapeutically useful as inhibitors of PDE4.