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Abstract
A direct synthesis of pyrazolo[3,4-b]pyridines [5&6] and [l]benzopyrano[4′,3′-e]pyrazolo[3,4-b]pyridines (7) is described by Friedlander condensation. An alternative and a short route for the preparation of [l]benzopyrano[4′,3′-e]pyrazolo[3,4-b]pyridines (7) is also reported.