Synthesis of Some Novel Heteroannelated Chromones by Basic Rearrangement of 6-Methylchromone-3-Carbonitrile

A new series of chromeno[2,3-b]pyridines was efficiently synthesized via chemical transformations of 6-methylchromone-3-carbonitrile with some methylene-active compounds bearing -CH2-CN and -CH2-CO- moieties. Some heteroannelated chromeno[2,3-b]pyridines were also synthesized. The structures of the new synthesized products were deduced on the basis of their analytical and spectral data.