反应详情

To a solution of 4-methoxyphenylacetone 9 (6.56 g, 4 mmol) in acetic anhydride (16 mmol) was added 90% HNO3 dropwise at −5° C. After adding HNO3, the ice-bath was removed and allowed to warm up to room temperature. The reaction was quenched by adding ice water. The resulting solution was extracted with ethyl acetate three times. The organic phase was dried over Na2SO4. Removal of the solvent under reduced pressure afforded crude product. Purification of the crude product by using silica gel column gave 10 (4.9 g, 59%). 1HNMR(CDCl3): 7.70 (d, J=2.1 Hz, 1H), 7.37 (dd, J=2.2 Hz, 8.5 Hz, 1H), 7.08 (d, J=8.5 Hz, 1H), 3.95 (s, 3H), 3.74 (s, 2H), 2.21 (s, 3H).

1. customthe ice-bath was removed
2. customThe reaction was quenched
3. additionby adding ice water
4. extractionThe resulting solution was extracted with ethyl acetate three times
5. dry with materialThe organic phase was dried over Na2SO4
6. customRemoval of the solvent under reduced pressure
7. customafforded crude product
8. customPurification of the crude product