反应详情

Trans-5-carboxy-3-[4-(2-oxopyrrolidin-1-yl)cyclohexylcarbonylamino]-N-(5-chloropyridin-2-yl)benzofuran-2-carboxamide (830 mg) obtained in Example 77 is suspended in N,N-dimethylformamide-pyridine (1:1, 30 ml), and thereto are added successively morpholine (196 mg), 1-hydroxybenzotriazole (406 mg) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (576 mg) under ice-cooling, and the mixture is stirred at room temperature for 17 hours. To the reaction solution are poured ice-water and a saturated aqueous sodium hydrogen carbonate solution, and the mixture is extracted with ethyl acetate, washed with water and a saturated brine, and dried over sodium sulfate. The solvent is evaporated under reduced pressure, and the resulting residue is purified by NH-silica gel column chromatography (eluent: chloroform). The resulting residue is suspended in ethyl acetate-n-hexane, and the precipitates are collected by filtration, and dried to give the title compound (805 mg).

1. temperaturecooling
2. extractiona saturated aqueous sodium hydrogen carbonate solution, and the mixture is extracted with ethyl acetate
3. washwashed with water
4. dry with materiala saturated brine, and dried over sodium sulfate
5. customThe solvent is evaporated under reduced pressure
6. customthe resulting residue is purified by NH-silica gel column chromatography (eluent: chloroform)
7. filtrationthe precipitates are collected by filtration
8. customdried