Facile and simple synthesis of some new polyfunctionally heterocyclic derivatives incorporating 2-imino-2H-chromene moiety

1,2‐Dihydro‐2‐imino‐6‐(2‐imino‐2H‐chromen‐3‐yl)‐1,4‐diphenyl‐pyridine‐3‐carbonitrile 4 has been synthesized and reacted with ethyl cyanoacetate to yield the new 5‐amino‐1,7‐dihydro‐2‐(2‐imino‐2H‐chromen‐3‐yl)‐7‐oxo‐1,4‐diphenyl‐1,8‐naphthyridine‐6‐carbonitrile 6, which consider a good and available starting intermediate for synthesis of series of functionalized chromenes. So, the compound 6 was utilized as a key for the synthesis of some new pyrimido[5,4‐c][1,8]naphthyridinones, pyrido[2,3‐c][1,6]naphthyridinones, triazolo[3′,4′:1,6]triazino][5,4‐c][1,8]naphthyridinones, triazolo[2′,3′:1,6]pyrimido[4,5‐c][1,8]naphthyridinones, triazepino[6,5‐c][1,8]naphthyridinone, and triazino[5,4‐c][1,8]naphthyridinones. The structures of these compounds were established by elemental analysis, IR, MS, and NMR spectral analysis. J. Heterocyclic Chem., (2012).