An Efficient and Facile Synthesis of tert‐Butyl 2‐(Methylamino)‐3‐nitro‐5‐oxo‐4‐aryl‐7,8‐dihydro‐4H‐pyrano[3,2‐c]pyridine‐6(5H)‐carboxylate derivatives in [BMIM]BF4

In this research, we have developed an efficient three-component reaction for the synthesis of pyrano[3,2-c]pyridine derivatives from the reaction of aromatic aldehydes, tert-butyl 2,4-dioxopiperidine-1-carboxylate, and N-methyl-1-(methylthio)-2-nitroethylen-1-amine in [BMIM]BF4 medium. The advantages of this method were readily available starting materials, simple reaction conditions, and satisfactory yields.