Hydrochloric Acid → Biphenyl-2-ylcarbamic acid 1-[2-(4-formyl-2,5-dimethylphenylcarbamoyl)ethyl]piperidin-4-yl ester hydrochloride

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Reaction Steps

To a 50 mL round-bottom flask was added biphenyl-2-ylcarbamic acid piperidin-4-yl ester (1.2 g, 4.04 mmol) and N-(4-[1,3]dioxolan-2-yl-2,5-dimethylphenyl)acrylamide (1.0 g, 4.04 mmol). Ethanol (10 mL) and dichloromethane (10 mL) were added to form a slurry. The reaction mixture was heated at 45° C. to 50° C. for about 18 hours and then cooled to room temperature. Aqueous 1M hydrochloric acid (10 mL) was added and the resulting mixture was stirred vigorously for about 3 hours. Dichloromethane (10 mL) was added and the resulting mixture was stirred for about 5 minutes. The layers were then separated and the organic layer was dried over anhydrous sodium sulfate, filtered and concentrated on a rotary evaporator to provide crude biphenyl-2-ylcarbamic acid 1-[2-(4-formyl-2,5-dimethylphenylcarbamoyl)ethyl]piperidin-4-yl ester hydrochloride (1.9 g). 1H NMR (300 MHz, DMSO-d6) δ 1.2-1.4 (m, 2H), 1.58-1.75 (m, 2H), 2.0-2.17 (m, 2H), 2.19 (s, 3H), 2.38 (s, 3H), 2.41-2.50 (m, 4H), 2.5-2.75 (m, 2H), 4.31-4.42 (m, 1H), 7.10-7.35 (m, 9H), 7.55 (s, 1H), 7.75 (s, 1H), 8.59 (s, 1H), 9.82 (s, 1H), 9.98 (s, 1H); MS [M+H+] found 500.2.

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