反应详情

To a clear solution of 3-(5-phenyl-4-(trifluoromethyl)isoxazol-3-yl)-7-vinyl-4,5-dihydronaphtho[1,2-c]isoxazole (Preparation 6A, 1.6 g, 3.92 mmol) in THF (15 mL) were sequentially added NMO (50% in water, 1.219 mL, 5.88 mmol) and osmium tetroxide (4% in water, 0.958 mL, 0.157 mmol) at room temperature. The solution was vigorously stirred at room temperature overnight. A cloudy solution of sodium periodate (1.425 g, 6.66 mmol) in water (14 mL) was added. The mixture was stirred at room temperature under nitrogen for 0.5 hr. Water (20 mL) was then added and the mixture was stirred at room temperature for 30 min. The solid was filtered, washed with water (2×2 mL) and methanol (2 mL) and dried to give 3-(5-phenyl-4-(trifluoromethyl)isoxazol-3-yl)-4,5-dihydronaphtho[1,2-c]isoxazole-7-carbaldehyde (1.6 g, 3.90 mmol, 100% yield) as a white solid. The compound had an HPLC retention time=4.02 min. (condition C); LC/MS M+1=410.9.

1. customat room temperature
2. stirringThe mixture was stirred at room temperature under nitrogen for 0.5 hr
3. stirringthe mixture was stirred at room temperature for 30 min
4. filtrationThe solid was filtered
5. washwashed with water (2×2 mL) and methanol (2 mL)
6. customdried