Fused imidazo[3,2-d]pyrazines as PI3 kinase inhibitors

摘要

There is provided compounds of formula (I), wherein A1, A2, A3, A4, n, the dotted lines, B1, B1a, B2, B2a, B3, B3a, B4, B4a, R2 and R3 have meanings given in the description, and pharmaceutically-acceptable esters, amides, solvates or salts thereof, which compounds are useful in the treatment of diseases in which inhibition of a protein kinase (e.g. a PI3-K and/or mTOR) is desired and/or required, and particularly in the treatment of cancer or a proliferative disease.