2-Acetylimidazo[4,5-b]pyridine was prepared and its reactions with some aromatic amines and sulfur (Willgerodt-Kindler reaction), some aromatic aldehydes, some carboxylic acid hydrazides as well as thiourea were investigated. New imidazo[4,5-b]pyridine derivatives with different substituents in 2-position (N-arylthioamides, imines, alpha, beta-unsaturated ketones, hydrazido-hydrazones and aminothiazole) were obtained. Most of the synthesized compounds were tested in vitro for their antituberculotic activity.

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