ChemInform Abstract: A Novel Access to Pyrido[4, 3‐d]pyrimidine Scaffold via Staudinger/Intramolecular Aza‐Wittig Reaction of 5‐Acyl‐4‐(β‐azidoalkyl)‐1, 2, 3, 4‐tetrahydropyrimidin‐2‐ones. Issue 4 (January 2015)