反应详情

To a mixture of 6-Vinyl-quinoxaline (0.68 g, 4.35 mmol) in dioxane (44 mL) and water (35 mL) was added osmium tetraoxide (2.5% wt in t-BuOH, 2.18 mL, 0.17 mmol) followed by sodium periodate (2.79 g, 13.1 mmol) and the reaction stirred for 3 h. The solution was diluted with ethyl acetate (150 mL) and then washed with water (3×75 mL) followed by brine (75 mL). The organics were dried with magnesium sulfate, filtered, and concentrated in vacuo. Purification by flash column chromatography on silica gel using 10-20% ethyl acetate in dichloromethane as eluant yielded 470 mg (68% yield) of Quinoxaline-6-carbaldehyde as a white solid. 1H NMR (DMSO-d6): 10.30 (s,1H), 9.11 (d,2H,J=1.9 Hz), 8.74 (d,1H,J=1.4 Hz), 8.26 (m,2H). LC/MS (Method A): r.t.=0.69 min., purity=94.8%, calculated mass=158, [M+H]+=159.

1. washwashed with water (3×75 mL)
2. dry with materialThe organics were dried with magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customPurification by flash column chromatography on silica gel using 10-20% ethyl acetate in dichloromethane as eluant