A mixture of 5-acryloyloxymethyl-6-(2-methoxyphenyl)-2,2,4-trimethyl-1,2-dihydroquinoline (Compound No. 1-7, 50 mg, 0.14 mmol), allylbromide (111 μL, 1.28 mmol) and potassium carbonate (78 mg, 0.56 mmol) was suspended in anhydrous N,N-dimethylformamide (2 mL), and the reaction mixture was stirred at 60° C. for 4 days. After cooling down, it was diluted with ethyl acetate (25 mL). The whole was washed with water (30 mL, twice) and saturated brine (30 mL) successively, dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled compound (23 mg) as a pale yellow oil. (Yield 41%)
