反应详情

A solution of 7-fluoro-1-(2-propen-1-yl)-2(1H)-quinoxalinone (2.4 g, 11.77 mmol) in 1,4-dioxane (140 ml) and water (250 ml) was treated with osmium tetroxide (4% solution in water; 14.5 ml) and sodium periodate (11.9 g) and the mixture was stirred at rt for 1.5 hours. It was evaporated to dryness onto silica gel and chromatographed on a 300 g silica gel column, eluting with 1:1 ethyl acetate-hexane then ethyl acetate. The early fractions gave (7-fluoro-2-oxo-1(2H)-quinoxalinyl)acetaldehyde which was triturated with ether/DCM 3:1 to give product (1.56 g).

1. customIt was evaporated to dryness onto silica gel
2. customchromatographed on a 300 g silica gel column
3. washeluting with 1:1 ethyl acetate-hexane