An extensive array of 4H‐pyrido[1,2‐a]pyrimidin‐4‐ones have been synthesized from commercially available 2‐aminopyridines and β‐oxo esters with excellent yields under solvent‐free conditions. The reaction, catalyzed by cheap and nontoxic BiCl3, proceeds with short reaction times under mild conditions and normal atmosphere. Only water and alcohol are formed as co‐products in this green reaction.

Solvent-Free Synthesis of 4H-Pyrido[1,2-a]pyrimidin-4-ones Catalyzed by BiCl 3: A Green Route to a PrivilegedBackbone. -(ROSLAN, I. I.; LIM, Q.-X.; HAN, A.; CHUAH*, G.-K.; JAENICKE, S.; Eur.