反应详情

温度

60 °C

414 mg of 4-[5-(3,5-Dichloro-phenyl)-2-methyl-5-trifluoromethyl-2,5-dihydro-isoxazol-3-yl]-2-methyl-benzoic acid ethyl ester (VIIIa) and 152 mg of sodium borohydride were suspended in 10 ml tetrahydrofurane. The mixture was heated to 60° C. and 0.85 ml of methanol was the added dropwise under vigorous stirring. The mixture was stirred at 60° C. until the gas evolution subsided. The mixture was then cooled and ice water followed by diethylether were added. Then a solution of hydrochloric acid (1N) was slowly added to acidify the solution. The organic phase was washed with water and dried. Evaporation of the solvent afforded {4-[5-(3,5-Dichloro-phenyl)-2-methyl-5-trifluoromethyl-2,5-dihydro-isoxazol-3-yl]-2-methyl-phenyl}-methanol as a solidified foam in 98% yield. 1H-NMR (CDCl3, δ in ppm): 7.28-7.45 (m, 6H), 5.34 (s, 1H), 4.72 (s, 2H), 2.99 (s, 3H), 2.35 (s, 3H).

1. additionadded dropwise under vigorous stirring
2. temperatureThe mixture was then cooled
3. additionwere added
4. washThe organic phase was washed with water
5. customdried
6. customEvaporation of the solvent