反应详情

The 3-isopropyl-6-vinyl-[1,2,4]triazolo[4,3-b]pyridazine (3.28 g, 17.4 mmol, Preparation #1) in 1,4-dioxane (75 mL) and water (15 mL) was treated with osmium tetroxide (3.5 mL, 0.28 mmol, 2.5 wt % in 2-methyl 1-propanol) and then sodium periodate (7.45 g, 34.9 mmol) was added. The mixture was stirred at ambient temperature for about 1 h and then diluted with 1,4-dioxane (50 mL) and filtered through Celite®. The filter cake was washed with 1,4-dioxane then EtOAc. The filtrate was concentrated under reduced pressure and then the residue was purified by flash chromatography on silica gel with DCM/MeOH (9:1) as an eluent to give the title compound (2.30 g, 69.4%) as a beige solid: 1H NMR (CDCl3) δ 1.61 (d, 6H), 3.76 (m, 1H), 7.65 (d, 1H), 8.21 (m, 1H), 10.06 (d, 1H).

1. filtrationfiltered through Celite®
2. washThe filter cake was washed with 1,4-dioxane
3. concentrationThe filtrate was concentrated under reduced pressure
4. customthe residue was purified by flash chromatography on silica gel with DCM/MeOH (9:1) as an eluent