Tetrahydrofuran → 4-Methyl-7-(2-thienyl)-5,6,7,8-tetrahydroquinolin-5-one

Participants

Reaction Steps

To a mixture of 5-(2-thienyl)cyclohexane-1,3-dione (1.5 g), 1-amino-2-butyne hydrochloride (0.82 g), molecular sieves 4A (3 g) and tetrahydrofuran (30 ml) was added triethylamine (0.78 g). The mixture was stirred at room temperature for 1 hour, refluxed for refluxed for 12 hours and cooled, and insoluble materials were filtered off. Under reduced pressure, the solvent was evaporated, and to the residue was added diphenylether (80 ml), and the mixture was stirred at 250° C. for 6 hours. Under reduced pressure, the solvent was evaporated, and the residue was dissolved in ethyl acetate. The solution was washed with 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 4-methyl-7-(2-thienyl)-5,6,7,8-tetrahydroquinolin-5-one (0.67 g).

Provenance & Evidence