反应详情

温度

125 °C

A flask is charged with zinc triflate (545 mg, 3 mol % based on the aldehyde compound mentioned blow). Vacuum (0.5 hPa or lower) is applied and the flask is heated to 125° C. for 2 hours. The flask is cooled to 23° C., the vacuum released and (+)-N-methylephedrine (296 mg, 3.3 mol % based on the aldehyde compound mentioned below) is added. Vacuum (0.5 hpa or lower) is applied for 0.5 hour and then released. To the flask, triethylamine (607 mg, 12 mol % based on the aldehyde compound mentioned below) and 2-(1,1-dimethyl-prop-2-ynyloxy)-tetrahydropyran as the alkyne compound (55 mmol, 110 mol % based on the aldehyde compound mentioned below) are added, and stirred for 0.25 hour at 25-30° C. And then cyclohexanecarboxaldehyde (50 mmol) as the aldehyde compound is added. The reaction mixture is stirred at 50° C. for 20 hours. Then, the distillation under reduced pressure gives (R)-1-cyclohexyl-4-methyl-4-tetrahydropyranyloxy-2-pentyn-1-ol, bp 130° C. (0.04 hPa), a colorless oil, in 82% yield.

1. temperatureThe flask is cooled to 23° C.
2. additionis added
3. additionare added
4. stirringThe reaction mixture is stirred at 50° C. for 20 hours
5. distillationThen, the distillation under reduced pressure