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In the current study, an environmentally benign and cost-effective procedures were suggested for the preparation of carboxy group functionalized imidazolium salts including [Cmmim]BF4- or [Cmmim]Br- as a new, re-usable Brønsted acidic ionic liquid (BAIL) catalyst. Then, the catalytic performance of [Cmmim]BF4- or [Cmmim]Br- were successfully inspected towards the three-components one-pot preparation of pyrano[2,3-d]pyrimidinone derivatives 4a-4q. The mentioned procedure shows short reaction times, easy work-up procedure, green conditions,