3,4-Diaminopyridine → HCID 178505655, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3,4-diaminopyridine (1.09 g., 1 mmoles), 3-fluorobenzoic acid (1.40 g., 10 mmoles), and polyphosphoric acid (PPA, 40 g.) was heated to about 200° C. with stirring for 3.5 hours. The solution was then slowly added to water. The solution was then neutralized by the addition of 50% aqueous sodium hydroxide and the resulting precipitate was collected by filtration. Crystallization from isopropanol/water gave 1.72 g. (81% yield) of 2-(3-fluorophenyl)imidazo[4,5-c]pyridine (base), m.p. about 290°-291° C.

Provenance & Evidence