反应详情

A solution of 4-cyano-4-(3-cyclopentyloxy-4-methoxyphenyl)cyclohexan-1-one (1.0 g, 3.19 mmol, prepared by the procedures described in PCT applications PCT/US3/01990 (WIPO publication No. WO 93/19748) and PCT application PCT/US93/02325 published as WIPO number WO 93/19750) in benzene (25 mL) was treated with p-toluenesulfonic acid (5 mg) and ethylene glycol (0.18 mL, 3.19 mmol) and was heated to reflux under an argon atmosphere; water was removed from the mixture via a Dean-Stark trap. After 1.5 h, ether (200 mL) was added, the solution was washed with aqueous 5% sodium bicarbonate and brine, was dried (potassium carbonate) and was evaporated to provide a clear colorless oil. 1H NMR(250 MHz, CDCl3) δ 7.0 (m, 2H), 6.85 (d, J=7 Hz, 1H), 4.8 (m, 1H), 4.0 (m, 4H), 3.85 (s, 3H), 1.58-2.20 (m, 16H).

1. temperaturewas heated
2. temperatureto reflux under an argon atmosphere
3. customwater was removed from the mixture via a Dean-Stark trap
4. additionether (200 mL) was added
5. washthe solution was washed with aqueous 5% sodium bicarbonate and brine
6. dry with materialwas dried (potassium carbonate)
7. customwas evaporated
8. customto provide a clear colorless oil