反应详情

In a nitrogen atmosphere, a solution of 0.230 g (0.90 mmole) of (S)-2-amino-1,1-diphenyl-3-methylbutan-1-ol in 2.5 ml of 1,2-dichloroethane was added dropwise at -78° C. to a solution comprising 1.29 ml (0.90 mmole) of 0.70M borane-tetrahydrofuran solution and 1 ml of 1,2-dichloroethane, and the temperature of the mixture was raised from -78° C. to room temperature over about 2 hours. Thereafter, a solution of 0.157 g (0.6 mmole, E/Z=99.9/0.1) of (E)-1-cyclohexyl-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-one in 2.5 ml of 1,2-dichloroethane was added dropwise to this solution, and stirring was carried out for 24 hours. The reaction product was decomposed with addition of 6 ml of 10% hydrochloric acid to the solution, and after removing (S)-2-amino-1,1-diphenyl-3-methylbutan-1-ol hydrochloride by filtration, the organic layer was washed with water and concentrated under reduced pressure to obtain crude (-)-(E)-1-cyclohexyl-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol.

1. temperaturethe temperature of the mixture was raised from -78° C. to room temperature over about 2 hours
2. customafter removing (S)-2-amino-1,1-diphenyl-3-methylbutan-1-ol hydrochloride
3. filtrationby filtration
4. washthe organic layer was washed with water
5. concentrationconcentrated under reduced pressure