Preparation of triazine-based functionalized HY zeolite and its application in the green synthesis of tetrahydrobenzo[b]pyran and 1, 4-dihydropyrano [2, 3-c] pyrazole derivatives as a novel mesoporous recyclable nanocatalyst

The triazine-based functionalized HY zeolite nanoparticles have been employed for synthesis of the pharmaceutically valuable 1, 4-dihydropyrano [2, 3-c] pyrazole and tetrahydrobenzo[b]pyran derivatives as a novel, versatile and effectual heterogeneous catalyst and characterized by FT-IR, XRD, BET, FE-SEM, TGA, EDX and MAP. The reactions were carried out under mild and green condition and short reaction times with high yield and easy workup process. The heterogeneous nanocatalyst can be simply recovered and reused for at least five times without considerable loss of activity. Graphical abstract