反应详情

To 20 ml of ethanol were added 2.66 g of diethyl 4-oxocyclohexane-1,2-dicarboxylate, 2.45 g of concentrated sulfuric acid and 1.08 g of phenylhydrazine. The mixture was refluxed for 2 hours and then cooled to room temperature. Thereto were added 50 ml of ethyl acetate and 50 ml of water. The mixture was adjusted to pH 7.5 with an aqueous saturated sodium hydrogencarbonate solution. The organic layer was separated, washed with an aqueous saturated sodium chloride solution, and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure. The residue was recrystallized from ethanol to obtain 1.87 g (yield: 59%) of diethyl 1,2,3,4-tetrahydrocarbazole-2,3-dicarboxylate as colorless needles.

1. temperatureThe mixture was refluxed for 2 hours
2. customThe organic layer was separated
3. washwashed with an aqueous saturated sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe solvent was removed by distillation under reduced pressure
6. customThe residue was recrystallized from ethanol