Synthetic studies of azaflavonoids. I. Studies on the synthesis of 5-azaflavone.

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Abstract

Azachalcones (IV) were synthesized from 2-cyano-3-hydroxy-pyridine (I) via three steps. Based on the ultraviolet spectroscopic data, the cyclization of IV to 5-azaflavanones (V) was assumed, but V could not be isolated. On the other hand, a 5-azaflavone (VIII) was prepared from I via five steps in a moderate yield.

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