反应详情

Compound (2) (3.1 g; 10 mmol) was dissolved in 150 mL CH2Cl2 at rt under N2. Solid 12 (5.1 g; 20 mmol) was added portion-wise to the stirring reaction, followed by catalytic 2,2,6,6-tetramethyl-1-piperdinyloxy, free radical (TEMPO; 0.23 g; 1.50 mmol). Saturated sodium bicarbonate solution was then added (20 mL) and the reaction allowed to stir overnight at rt under N2. The resulting light orange solid was filtered off and washed repeatedly with CH2Cl2 and diethyl ether until the extractions ran clear and colorless. After drying, 4-(6-bromo-4-methyl-3-oxo-3,4-dihydro-pyrazin-2-ylamino)-benzaldehyde (3) was obtained in nearly quantitative yields (3.1 g) and was carried directly on to the next reaction. MS 308.01 & 310.01 (M+H)

1. customto the stirring reaction
2. filtrationThe resulting light orange solid was filtered off
3. washwashed repeatedly with CH2Cl2 and diethyl ether until the extractions
4. customAfter drying