反应详情

50% Sodium hydride (4.8 g, 0.1 mol) was washed with petroleum ether then stirred in dry tetrahydrofuran (50 ml) under nitrogen at -20° C. Ethyl 3-(2-methoxyphenylamino)acrylate (17.4 g, 0.1 mol) in dry tetrahydrofuran (100 ml) was added dropwise, keeping the temperature to -20° C. Cooling was removed and the mixture was stirred until a dark red colour was achieved. The mixture was recooled to -20° C. and cyclohexylcarbonyl chloride (14.0 ml, 0.1 mol) in dry tetrahydrofuran (50 ml) was added dropwise. The mixture was allowed to warm to room temperature and was stirred for a further 3 hours. The solvent was evaporated and the residue was partitioned between dichloromethane and 2M HCl. The organic layer was washed with water and brine, dried and evaporated to an oil which was chromatographed (silica gel, dichloromethane-hexane) to afford ethyl 2-cyclohexylcarbonyl-3-(2-methoxyphenylamino)acrylate as a yellow oil (23.3 g, 70%).

1. customto -20° C
2. temperatureCooling
3. customwas removed
4. customwas recooled to -20° C.
5. stirringwas stirred for a further 3 hours
6. customThe solvent was evaporated
7. customthe residue was partitioned between dichloromethane and 2M HCl
8. washThe organic layer was washed with water and brine
9. customdried
10. customevaporated to an oil which
11. customwas chromatographed (silica gel, dichloromethane-hexane)