[NH2:1][C:2]1[C:3]([OH:12])=[C:4]([CH:9]=[CH:10][CH:11]=1)[C:5]([O:7][CH3:8])=[O:6].N1C=CC=CC=1.[N:19]1[CH:24]=[CH:23][C:22]([C:25]2[CH:26]=[C:27]([CH:31]=[CH:32][CH:33]=2)[C:28](Cl)=[O:29])=[CH:21][CH:20]=1>C1(C)C=CC=CC=1>[OH:12][C:3]1[C:2]([NH:1][C:28](=[O:29])[C:27]2[CH:31]=[CH:32][CH:33]=[C:25]([C:22]3[CH:21]=[CH:20][N:19]=[CH:24][CH:23]=3)[CH:26]=2)=[CH:11][CH:10]=[CH:9][C:4]=1[C:5]([O:7][CH3:8])=[O:6]Thionyl chloride (10 mL) was added to 3-(pyridin-4-yl)benzoic acid (1.5 g, 7.5 mmol) and the mixture was stirred under reflux overnight. The solvent was evaporated under reduced pressure and the residue was dried in vacuum giving 1.5 g of crude 3-(pyridin-4-yl)benzoyl chloride. To a solution of methyl 3-amino-2-hydroxybenzoate (950 g, 5.8 mmol) and pyridine (480 mg, 6 mmol) in toluene (50 mL) was added crude 3-(pyridin-4-yl)benzoyl chloride (1.5 g, 7 mmol) portion wise at 0° C. and then stirred at 70° C. for 4 h. The resulting mixture was extracted with ethyl acetate (100 mL×4), the organic phase was washed with water and saturated sodium bicarbonate, dried with anhydrous sodium sulfate and evaporated under reduced pressure to obtain methyl 2-hydroxy-3-(3-(pyridin-4-yl)benzamido)benzoate as a yellow solid (1.8 g, yield 85%). LC-MS (ESI) m/z: 349 (M+1)+.
読み込み中…
