[O:1]=[C:2]1[NH:9][CH:8]=[C:7]([C:10]2[CH:15]=[CH:14][N:13]=[CH:12][CH:11]=2)[CH:6]=[C:3]1C#N.S(=O)(=O)(O)O.[OH-].[NH4+].N1C=CC(C2C=CC(=O)NC=2)=CC=1.[N+:36]([O-])([OH:38])=[O:37]>O>[N+:36]([C:3]1[C:2](=[O:1])[NH:9][CH:8]=[C:7]([C:10]2[CH:15]=[CH:14][N:13]=[CH:12][CH:11]=2)[CH:6]=1)([O-:38])=[O:37]Alternatively, 3-nitro-5-(4-pyridinyl)-2(1H)-pyridinone is prepared step-wise starting with 1,2-dihydro-2-oxo-5-(4-pyridinyl)-nicotinonitrile as follows: A mixture containing 197 g. of 1,2-dihydro-2-oxo-5-(4-pyridinyl)-nicotinonitrile, 600 ml. of concentrated sulfuric acid and 150 liters of water was refluxed for twenty-four hours, cooled and poured into 10 liters of a mixture of ice and water. The mixture was neutralized with ammonium hydroxide and the separated precipitate was collected, washed with a small amount of cold water and dried in vacuo at 80° C. to yield 148 g. of 5-(4-pyridinyl)-2(1H)-pyridinone, m.p. 258°-260° C. An 80 g. portion of 5-(4-pyridinyl)-2(1H)-pyridinone was added to 288 ml. of concentrated sulfuric acid and the mixture heated to 70° C. To this stirred solution kept at 70°-80° C. was added dropwise a mixture containing 102 ml. of 90% nitric acid and 29 ml. of concentrated sulfuric acid. The reaction mixture was heated at about 80° C. for three hours after addition of the mixture of acids. The reaction mixture was then cooled and poured into a mixture of ice and water with stirring. The precipitate was collected and dried. It was then slurried with water and neutralized with 10% aqueous potassium bicarbonate solution. The precipitate was collected, washed with water and dried in vacuo at 80° C. to yield 56 g. of 3-nitro-5-(4-pyridinyl)-2(1H)-pyridonone.
Wird geladen…
