反应详情

A solution of 4.5 g. of 3-(dimethylamino)-8-carboxy-1,2,3,4-tetrahydrocarbazole (Example 39) in 150 ml. of 5-N hydrogen chloride in ethyl alcohol was heated under reflux for thirty hours. The solution was evaporated to dryness under reduced pressure and the residue was recrystallized from ethanol to give 3 g. of 3-(dimethylamino)-8-ethoxycarbonyl-1,2,3,4-tetrahydrocarbazole hydrochloride, m.p. 263°-264° C.

1. temperatureunder reflux for thirty hours
2. customThe solution was evaporated to dryness under reduced pressure
3. customthe residue was recrystallized from ethanol
4. customto give 3 g