p-Toluenesulfonic acid monohydrate → N-(3-(4-Isopropylphenyl)-4,6-dimethyl-7-vinyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide

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A solution of N-(7-(1-hydroxyethyl)-3-(4-isopropylphenyl)-4,6-dimethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide (1.23 g, 3.02 mmol) obtained in Example 22 and p-toluenesulfonic acid monohydrate (20 mg) in toluene (20 mL) was refluxed with heating at 80° C. for 1 hour under an argon atmosphere. The reaction solution was washed with an aqueous saturated sodium hydrogen carbonate solution, dried over magnesium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:9) to obtain 1.09 g (yield: 89%) of the title compound. Melting point: 171-172° C. (hexane-ethyl acetate).

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