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3H-Imidazolo[4,5-c]pyridine was prepared by the method of Stanovik and Tisler, Synthesis, 2, 120 (1974). A mixture of 2.2 g (0.02 mole) of 3,4-diaminopyridine and 5 ml diethoxymethyl acetate was heated at reflux for two hours. The reaction mixture was cooled and diluted by addition of ethyl acetate. The solid precipitate was collected by filtration and sublimed at 170° C. and 50 torr to give 0.84 g of 3H-imidazolo[4,5-c]pyridine; mp 165°-168° C.

1. custom3H-Imidazolo[4,5-c]pyridine was prepared by the method of Stanovik and Tisler, Synthesis, 2, 120 (1974)
2. temperaturewas heated
3. temperatureat reflux for two hours
4. temperatureThe reaction mixture was cooled
5. filtrationThe solid precipitate was collected by filtration
6. customsublimed at 170° C.