Hf(OTf)4-catalyzed unprecedented annulation of an enamine with triethyl orthoformate leading to the preparation of tetrasubstituted symmetricalpyridine derivatives without an oxidant is described. This method accommodated the single-step synthesis of a disubstitutedsymmetricalpyridine using an acetophenone derivative, triethyl orthoformate, and ammonium acetate (NH4OAc).