反应详情

Hydroxylamine hydrochloride (1.11 g, 16.0 mmoles) and triethylamine (2.22 ml) were added to a solution of 4-(tert-butyl-diphenyl-silanyloxymethyl)-5-methyl-furan-2-carbaldehyde from (i)(6.3 g, 16.0 mmoles) in dichloromethane (125 ml) and the mixture was stirred at room temperature for 17 hours. After cooling to 0° C., 2-Chloro-1,3-dimethylimidazolium chloride (2.81 g, 16.6 mmoles) and triethylamine (4.6 ml) were added and the yellow suspension was stirred at room temperature for 24 hours. The mixture was diluted with water and extracted with dichloromethane. The combined extracts were washed with 5% aqueous hydrochloric acid, saturated aqueous sodium bicarbonate and water, and finally dried (MgSO4). The solvent was evaporated and the residue was purified by flash chromatography (silica, cyclohexane/diethyl ether 99:1 v/v as eluent) to afford 4-(tert-butyl-diphenyl-silanyloxymethyl)-5-methyl-furan-2-carbonitrile as a viscous oil, (3.75 g).

1. temperatureAfter cooling to 0° C.
2. stirringthe yellow suspension was stirred at room temperature for 24 hours
3. extractionextracted with dichloromethane
4. washThe combined extracts were washed with 5% aqueous hydrochloric acid, saturated aqueous sodium bicarbonate and water
5. dry with materialfinally dried (MgSO4)
6. customThe solvent was evaporated
7. customthe residue was purified by flash chromatography (silica, cyclohexane/diethyl ether 99:1 v/v as eluent)