New benzo[beta]chromeno-naphthyridin-7-one and pyrano[2',3':7,8] quino[2,3-beta]quinoxalin-7-one compounds, process for their preparation and pharmaceutical compositions containing them

摘要

A compound of formula (I) is disclosed, wherein: B1 and B2, which may be the same or different, represent, independently of one another, carbon or nitrogen, with the proviso that at least one of B1 or B2 represents nitrogen, and X, Y, X1, Y1, R1, R2, R3, R4, and A are as defined in the specification. The compound of formula (I) is suitable for use in the treatment of cancer.