Compounds of Formula (I) and pharmaceutically acceptable salts thereof are described, as well as the pharmaceutical compositions containing said compounds and their pharmaceutically acceptable salts, and the use of said compounds and pharmaceutical compositions for the treatment, control or amelioration of proliferative diseases, including cancer.Cette invention concerne des composés de formule (I) et des sels pharmaceutiquement acceptables de ces composés, ainsi que des compositions pharmaceutiques contenant les dits composés et leurs sels pharmaceutiquement acceptables. Linvention concerne également lutilisation desdits composés et compositions pharmaceutiques pour le traitement, le contrôle ou lamélioration de maladies prolifératives, dont le cancer.