反应详情

2-Chloro-6-methylnicotinic acid (25.0 g) was suspended in a mixed solvent of dimethylformamide (100 mL) and chloroform (100 mL), and to this suspension were added dimethylaminopyridine (21.3 g) and methanol (4.67 g). Finally, 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide (WSC) hydrochloride (33.5 g) was added to the mixture, followed by stirring at room temperature for 6 hours. After the reaction mixture was concentrated, ethyl acetate (300 mL) was added thereto. The mixture was washed successively with water, 10% ammonium chloride, water, and saturated brine, dried over sodium sulfate, and concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:4, v/v) to give the title compound (24.6 g) as a colorless oil.

1. concentrationAfter the reaction mixture was concentrated
2. additionethyl acetate (300 mL) was added
3. washThe mixture was washed successively with water, 10% ammonium chloride, water, and saturated brine
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:4, v/v)