反应详情

To a mixture of 2-(methoxycarbonyl)isonicotinic acid (150 mg, 0.83 mmol), ethylamine hydrochloride salt (203 mg, 2.48 mmol), and diisopropylethylamine (0.72 mL, 4.14 mmol) in DMF is added HBTU (377 mg, 0.99 mmol) at 0° C. After stirring at room temperature for 1 hour, the mixture is poured onto water (30 mL). The aqueous phase is extracted with dichloromethane (30 mL×2). The combined organic layer is dried over sodium sulfate and concentrated in vacuo. The residue is purified by column chromatography on silica gel eluting with n-hexane/ethyl acetate (2:1˜1:1) to give 83 mg (48% yield) of the title compound as a white solid.

1. additionthe mixture is poured onto water (30 mL)
2. extractionThe aqueous phase is extracted with dichloromethane (30 mL×2)
3. dry with materialThe combined organic layer is dried over sodium sulfate
4. concentrationconcentrated in vacuo
5. customThe residue is purified by column chromatography on silica gel eluting with n-hexane/ethyl acetate (2:1˜1:1)