Toluene → 7-(2,5-Difluorophenyl)-4-methyl-5,6,7,8-tetrahydroquinolin-5-one

Beteiligte Stoffe

Reaktionsschritte

A mixture of 1-amino-5-(2,5-difluorophenyl)cyclohexan-3-one (3.7 g), 3-oxobutylaldehyde dimethyl acetal (5.5 g), toluene (120 ml) and ethanol (70 ml) was stirred at 115° C. with adding potassium hydroxide powder (0.77 g). The mixture was combined with potassium hydroxide powder (0.16 g) after 30 minutes and with potassium hydroxide powder (0.16 g) and 3-oxobutylaldehyde dimethyl acetal (0.44 g) after 1 hour and further with potassium hydroxide powder (0.16 g) after 1 hour and 30 minutes, and then stirred at the same temperature for 5 hours. After cooling, the solvent was distilled off under reduced pressure and ethyl acetate was added. The organic layer was washed successively with water and saturated brine, and dried over magnesium sulfate. Ethyl acetate was distilled off under reduced pressure, and the residue was subjected to a silica gel column (ethyl acetate-hexane), and the resultant crystal was recrystallized from ethyl acetate-hexane to obtain 7-(2,5-difluorophenyl)-4-methyl-5,6,7,8-tetrahydroquinolin-5-one (2.3 g).

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