反应详情

A solution of 1.2 g of (R)-2-(4,5-dihydro-8-methoxy-1H-benz[g]indol-1-yl)-1-methyl-ethylamine, 0.52 g of triethylamine and 0.83 g of ethyl trifluoroacetate in 50 ml of anhydrous methanol was stirred at room temperature for 27 hours. After the solvent had been drawn off in a vacuum, the residue was taken up with 70 ml of anhydrous dioxane, 1.8 g of DDQ were added and the mixture was boiled under reflux for 1.5 hours, Subsequently, the reaction mixture was concentrated in a vacuum and the residue was purified by column chromatography on silica gel (dichloromethane/acetone 4:1). 0.97 g (59%) of (R)-N-[2-(8-methoxy-1H-benz[g]indol-1-yl)-1-methyl-ethyl]-trifluoroacetamide was obtained as a pale brown solid which was used in the next reaction without additional recrystallization.

1. additionwere added
2. temperatureunder reflux for 1.5 hours
3. concentrationSubsequently, the reaction mixture was concentrated in a vacuum
4. customthe residue was purified by column chromatography on silica gel (dichloromethane/acetone 4:1)