Butyn-2-one → 2-Methyl-7-(2-methylphenyl)-5,6,7,8-tetrahydroquinolin-5-one

Participants

Reaction Steps

A mixture of 5-(2-methylphenyl)cyclohexane-1,3-dione (1.3 g) and ammonium acetate (0.49 g) in ethanol (30 ml) was stirred at room temperature for 30 minutes, and to the mixture was added 3-butyn-2-one (0.44 g). The reaction solution was stirred at room temperature for 1.5 hours and refluxed for 27 hours. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in ethyl acetate. The solution was washed with sodium hydrogen carbonate solution, water and saturated brine, dried with magnesium sulfate and concentrated under reduced pressure, and the residue was purified with silica gel column chromatography (EtOAc/hexane) to give colorless crystals of 2-methyl-7-(2-methylphenyl)-5,6,7,8-tetrahydroquinolin-5-one (0.88 g).

Provenance & Evidence