Sulfuric Acid → 1,4-Dimethyl-2-oxo-6-(3-trifluoromethyl-phenyl)-1,2-dihydro-pyridine-3-carboxylic acid
反応式
[OH:1][C:2]1[N:10]=[C:9]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([C:17]([F:20])([F:19])[F:18])[CH:12]=2)[CH:8]=[C:7]([CH3:21])[C:3]=1[C:4]([OH:6])=[O:5].[CH3:22]C1C=C(C2C=CC=C(C(F)(F)F)C=2)NC(=O)C=1C(O)=O.OS(O)(=O)=O>CO>[CH3:22][N:10]1[C:9]([C:11]2[CH:16]=[CH:15][CH:14]=[C:13]([C:17]([F:20])([F:18])[F:19])[CH:12]=2)=[CH:8][C:7]([CH3:21])=[C:3]([C:4]([OH:6])=[O:5])[C:2]1=[O:1]参加物
4
実験手順
A solution of 0.30 g (1.0 mmol) of 2-hydroxy-4-methyl-6-(3-trifluoromethyl-phenyl)-nicotinic acid/4-methyl-2-oxo-6-(3-trifluoromethyl-phenyl)-1,2-dihydro-pyridine-3-carboxylic acid in 15 ml of MeOH was treated with 0.06 ml=0.01 g (0.1 mmol) of H2SO4 (98%) and the reaction mixture was heated up to reflux. After 4 hours, it was cooled down to RT, poured into crashed ice and extracted twice with CH2Cl2; the organic phases were washed with water, dried over magnesium sulfate, filtered and evaporated. The residue was purified by flash column chromatography (CH2Cl2/MeOH 1:0 to 9:1) to give 0.24 g (77%) of the title compound as off-white solid. MS: 312.0 (MH+).