In the title mol-ecule, C(17)H(15)BrN(4)O(2), the fused-ring system is essentially planar, the largest deviation from the mean plane being 0.015 (2) Å, and forms dihedral angles of 37.8 (2) and 35.5 (2)° with the phenyl and oxazolidine rings, respectively. The conformation adopted by the mol-ecule is stabilized by an intra-molecular π⋯π inter-action [centroid-centroid distance = 3.855(2) Å] between oxazolidine and phenyl rings. The crystal packing features inter-molecular C-H⋯N and C-H⋯O inter-actions.