[Derivatives if imidazol (1,5-a) pyridin-3(2H)-one].

Numerous imidazo[1,5-a]pyridin-3(2H)-one derivatives having one or two electron-attracting substituents in positions 1 or 2 have been prepared starting from substituted 2-aminomethyl-pyridines and phosgene or ethyl chlorocarbonate. Attempts to obtain unsubstituted imidazo[1,5-a]-pyridin-3(2H)-one were not successful.