反应详情

1.7 ml of 2N aqueous NaOH solution was added to a solution of 478 mg (1.7 mmol) of 1-[[1-oxo-3-(2-furanyl)propyl]amino]cyclohexanecarboxylic acid methyl ester obtained in Reference Example 64 in 2 ml of tetrahydrofuran, and the mixture was heated under reflux for 3 hours. Ether was added to the reaction solution to wash it. After the separated aqueous layer was neutralized by concentrated hydrochloric acid, it was extracted with ethyl acetate. After the obtained organic layer was washed with saturated brine, it was dried with anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. Then, 10 ml of methylene chloride and 377 mg (1.82 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride were added to the residue, and the mixture was stirred at room temperature overnight. The solvent was distilled off under reduced pressure, ethyl acetate was added thereto, and the mixture was washed with water, a 10% aqueous potassium hydrogensulfate solution, a saturated aqueous sodium hydrogencarbonate solution and then saturated brine, followed by drying with anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to obtain 198 mg (47%) of the title compound.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 3 hours
3. washto wash it
4. extractionwas extracted with ethyl acetate
5. washAfter the obtained organic layer was washed with saturated brine, it
6. dry with materialwas dried with anhydrous sodium sulfate
7. distillationthe solvent was distilled off under reduced pressure
8. distillationThe solvent was distilled off under reduced pressure, ethyl acetate
9. additionwas added
10. washthe mixture was washed with water
11. dry with materialby drying with anhydrous sodium sulfate
12. distillationThe solvent was distilled off under reduced pressure