反应详情

This compound was prepared by the oxidation of the corresponding acylamido with potassium dichromate in glacial acetic acid. Into a 1000 ml Erlenmeyer flask, 240 ml of glacial acetic acid, and 5,7-diacetamido-2-methyl-8-acetoxyquinoline (31) (prepared as described in Example 31) (6.3 g, 2.0 mmol) were added. To the resulting suspension, a solution of potassium dichromate (17.64 g) in 200 ml of water was added. This black solution was magnetically stirred at room temperature for 20-24 hours. The solution was then poured into 900 ml of water and extracted with dichloromethane (5×200 ml). The organic extracts were washed with a solution of 5% sodium carbonate in a saturated salt solution (3×300 ml). The organic layer was dried overnight with anhydrous magnesium sulfate. The magnesium sulfate was filtered off, and the solvent was evaporated to leave an orange/yellow solid. The solid 7-acetamino-2-methylquinoline-5,8-dione (27) was dried overnight under vacuum. 2.6 g of product was obtained for a yield of 56%.

1. extractionextracted with dichloromethane (5×200 ml)
2. washThe organic extracts were washed with a solution of 5% sodium carbonate in a saturated salt solution (3×300 ml)
3. dry with materialThe organic layer was dried overnight with anhydrous magnesium sulfate
4. filtrationThe magnesium sulfate was filtered off
5. customthe solvent was evaporated
6. customto leave an orange/yellow solid
7. dry with materialThe solid 7-acetamino-2-methylquinoline-5,8-dione (27) was dried overnight under vacuum