反应详情

To a mixture of potassium t-butoxide (2.05 g) and anhydrous N,N-dimethylformamide (60 ml) was added butyltriphenylphosphonium bromide (7.30 g) at room temperature. The mixture was stirred for 15 minutes and then a solution of t-butyl 4-oxocyclohexylcarbamate (1.30 g) in N,N-dimethylformamide (10 ml) was added to the mixture. The reaction mixture was stirred at room temperature overnight and then saturated aqueous ammonium chloride was added to the mixture. The mixture was extracted with toluene, and the organic layer was washed with brine, dried over sodium sulfate, and then the solvent was removed in vacuo. After diethyl ether was added to the residue, the precipitate was filtered off and then the filtrate was concentrated under reduced pressure. The residue was purified by a silica gel chromatography (eluent: gradient from 100% hexane/0% ethyl acetate to 0% hexane/100% ethyl acetate) to give 1.40 g of t-butyl (4-butylidenecyclohexyl)carbamate.

1. stirringThe reaction mixture was stirred at room temperature overnight
2. extractionThe mixture was extracted with toluene
3. washthe organic layer was washed with brine
4. dry with materialdried over sodium sulfate
5. customthe solvent was removed in vacuo
6. additionAfter diethyl ether was added to the residue
7. filtrationthe precipitate was filtered off
8. concentrationthe filtrate was concentrated under reduced pressure
9. customThe residue was purified by a silica gel chromatography (eluent: gradient from 100% hexane/0% ethyl acetate to 0% hexane/100% ethyl acetate)