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An efficient one-pot process was developed to synthesize 4 H -chromene derivatives using a three-component reaction involving salicylaldehydes, cyclic 1,3-diketones, and thiols in an aqueous medium at room temperature. This protocol was accomplished using the inexpensive and readily available catalyst NH 4 Cl. The attractive features of this protocol are: use of inexpensive catalyst NH 4 Cl, good yields, and mild and environmentally benign reaction conditions.

Ammonium Chloride-Catalyzed Three-Component Reaction for the Synthesis of Fused 4H-Chromene Derivatives in Aqueous Medium