title: Cleavage of pyrimidines and fused pyrimidines by active methylene reagents with closure to give pyridine derivatives.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003500:Cyclization; D009682:Magnetic Resonance Spectroscopy; D011725:Pyridines / Q000138:chemical synthesis; D011743:Pyrimidines
chemical_list: D011725:Pyridines; D011743:Pyrimidines