Solvent‐Free, One‐Pot Synthesis of Pyrano[2,3‐c]pyrazole Derivatives in the Presence of KF·2H2O by Grinding

Abstract A solvent‐free, one‐pot process for the preparation of 4H‐pyrans in the presence of KF · 2H2O by grinding was achieved. Its advantages are easy workup, mild reaction conditions, high yields, and environmental friendliness.