Reaction of 1,3-dicarbonyl compounds with nitriles: synthesis of pyrazolo [1,5-c] -1,2,4-triazines, pyridines 4H-indeno [1,2-b] pyran derivatives

Several new pyrazolopyridotriazines, pyridines, 4H-pyran and H-indeno [1,2-b] pyran derivatives were prepared from beta-dicarbonyl compounds I, II and the ylidenes III and IV as starting materials