反应详情

4-Hydroxycyclohexanecarboxylic acid (10.0 g, 69.4 mmol) and N,O-dimethylhydroxylamine hydrochloride (8.80 g, 90.2 mmol) in dichloromethane (500 mL) was stirred with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (17.3 g, 90.2 mmol), 1-hydroxybenzotriazole (12.2 g, 90.2 mmol) and N,N-diisopropylethylamine (24.2 mL, 139 mmol) at room temperature for one day. After addition of water, the reaction mixture was extracted with chloroform, and the organic layer was washed with saturated aqueous sodium chloride, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/1 (v/v)→ethyl acetate) to give the title compound as a yellow oil (9.07 g, yield 70%).

1. extractionthe reaction mixture was extracted with chloroform
2. washthe organic layer was washed with saturated aqueous sodium chloride
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/1 (v/v)→ethyl acetate)