Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → 4-(3-Cyclopentyloxy-4-methoxyphenyl)-4-(4-pyridylethynyl)cyclohexan-1-one

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Reaction Steps

A mixture of 4-(3-cyclopentyloxy-4-methoxyphenyl)-4-(4-pyridylethynyl)-1,1-(ethylenedioxy)cyclohexane (0.10 g, 0.24 mmol) and pyridinium p-toluenesulfonate (0.06 g, 0.24 mmol) in acetone (4 mL) and water (1 mL) was refluxed for 20 h., then was evaporated. Water was added, the mixture was extracted three times with dichloromethane, was dried (magnesium sulfate) and was evaporated. Purification by flash chromatography, eluting with 35:65 ethyl acetate:hexanes, provided 4-(3-cyclopentyloxy-4-methoxyphenyl)-4-(4-pyridylethynyl)cyclohexan-1-one (0.08 g, 91%) as a white solid, mp 148°-149° C. Anal. (C25H27NO3.0.5 H2O) calcd: C, 75.29; H, 7.08; N, 3.51; found: C, 75.51; H, 6.95; N, 3.42.

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