Eco-friendly, reusable ZnCr2O4 Nano catalyzed tetrahydroquinoline derivatives are prepared via Povarov reaction route from aromatic aldehydes, α-amino naphthalene, and 2,3-dihydrofuran under reflux/ultrasonic irradiation methods. This several affords several benefits like good to excellent yields, a higher percentage of atom economy. Substituted tetrahydroquinolines have been shown great biological potential.