p-Toluenesulfonic acid → 1-oxo-3-phenyl-6-(3-phenyl-propoxy)-1H-indene-2-carboxylic acid methyl ester

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Reaction Steps

1-Oxo-3-phenyl-6-(3-phenylpropoxy)-1H-indene-2-carboxylic acid ethyl ester (2 g, 4.85 mmol) obtained in Example 7 was dissolved in methanol, p-toluenesulfonic acid (92 mg, 0.49 mmol) was added thereto, and refluxed for 24 hrs. The resulting mixture washed with sodium bicarbonate and extracted with ethyl acetate. The organic layer was separated, dried over anhydrous MgSO4 and concentrated under a reduced pressure. Then, the resulting residue was purified by flash chromatography to obtain 1.2 g of the titled compound (yield: 62%).

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