反应详情

7-Bromo-1-(2-propen-1-yl)pyrido[2,3-b]pyrazin-2(1H)-one (278 mg, 1.045 mmol) was dissolved in 1,4-dioxane (10 ml) and water (10 ml). Sodium periodate (559 mg, 2.613 mmol) was added, followed by osmium tetroxide (0.22 ml of 4% aqueous solution). The mixture stirred at rt for 1 h, water 40 ml was added the mixture was stirred for a further 1 h. The reaction was concentrated to about 50 ml and extracted with 20% MeOH/DCM (3×100 ml). The organic extracts were combined, dried over anhydrous magnesium sulphate, filtered and evaporated under reduced pressure to give (7-bromo-2-oxopyrido[2,3-b]pyrazin-1(2H)-yl)acetaldehyde (existing mostly as the hydrate) as an impure brown oil (423 mg, 107%).

1. stirringwas stirred for a further 1 h
2. concentrationThe reaction was concentrated to about 50 ml
3. extractionextracted with 20% MeOH/DCM (3×100 ml)
4. dry with materialdried over anhydrous magnesium sulphate
5. filtrationfiltered
6. customevaporated under reduced pressure