反应详情

2.57 g of N-[2-((1R,3R,4S)-1-methyl-4-isopropylcyclohex-3-yloxy)ethyl]-N-(2-hyd roxyethyl)-N-methylamine were dissolved in 100 ml of tetrahydrofuran. 0.48 g of a 50% strength sodium hydride dispersion was added at room temperature, and the reaction mixture was heated under reflux for 3 hours. A solution of 1.1 g of ethyl bromide in 20 ml of tetrahydrofuran was then added dropwise to the reaction solution at boiling temperature, and the reaction solution was heated under reflux for a further 6 hours. The reaction solution was worked up by adding 2 ml of water and concentrating the mixture under reduced pressure. The remaining residue was purified by chromatography on silica gel using n-hexane/dichloromethane/methanol as the eluent. 0.55 g of oily N-[2-((1R,3R,4S)-1-methyl-4-isopropylcyclohex-3-yloxy)ethyl]-N-(2-etho xyethyl)-N-methylamine was obtained. [α]D20 =-51.20° (c=1; methanol)

1. temperaturethe reaction mixture was heated
2. temperatureunder reflux for 3 hours
3. temperaturethe reaction solution was heated
4. temperatureunder reflux for a further 6 hours
5. concentrationconcentrating the mixture under reduced pressure
6. customThe remaining residue was purified by chromatography on silica gel