A highly efficient three-component coupling of aldehyde, terminal alkyne, and amine via C–H activation catalyzed by reusable immobilized copper in organic–inorganic hybrid materials under solvent-free reaction conditions

Recycling copper(I) immobilized on organic–inorganic hybrid material behaves as a very efficient heterogeneous catalyst in the three-component Mannich coupling reaction of aldehydes, terminal alkynes, and amines via C–H activation to afford the corresponding products in good to excellent yields under solvent-free reaction conditions.