Here we report the synthesis of Ni(II) immobilized on modifed boehmite nanostructures as an environmentally friendly heterogeneous catalyst for the one-pot domino synthesis of benzo[a]pyrano[2,3-c]phenazine and benzo[a]benzo[6,7]chromeno[2,3- c]phenazine in PEG as a green solvent. Elemental analysis, FT-IR, XRD, TGA, SEM, EDX, and ICP-OEC confrmed the structure of this nanocatalyst. Importantly, this nanocatalyst can be easily separated from the reaction media and reused for at least four consecutive cycles without a discernible reduction in its catalytic activity.
