Copper(II) Anchored on Amine-Functionalized MMT: A Highly Efficient Catalytic System for the One-Pot Synthesis of Bispyrano[2,3-c]pyrazole Derivatives

Scheme 3

Proposed mechanism for one-pot synthesis of bispyrano[2,3-c]pyrazoles by MMT-[(CH₂)₃-NH=CHPy]-Cu(II).