反应详情

To a stirred solution of (62) (1.97 g, 5.59 mmol) in anhydrous DMF (25 ml) under nitrogen atmosphere, was added 60% sodium hydride (224 mg, 5.59 mmol). After 10 min., oxygen was bubbled into the reaction mixture for 4 hr. The mixture was partitioned between ether and aqueous saturated ammonium chloride solution. The organic layer was taken, washed with water twice, dried with anhydrous magnesium sulfate, filtered, and evaporated in vacuo. The residue was then purified by silica gel column chromatography (eluent, ether:hexanes (1:30)) to afford 1.37 g (72%) of the title compound as a white solid. m.p. 118-119° C.; 1H NMR (200 MHz, CDCl3) δ 1.09 (3H, t, J=7.4 Hz), 2.46 (2H, q, J=7.4 Hz), 3.95 (3H, s), 4.08 (3H, s), 7.58 (1H, t, J=1.8 Hz), 7.56 (2H, d, J=1.8 Hz).

1. customoxygen was bubbled into the reaction mixture for 4 hr
2. customThe mixture was partitioned between ether and aqueous saturated ammonium chloride solution
3. washwashed with water twice
4. dry with materialdried with anhydrous magnesium sulfate
5. filtrationfiltered
6. customevaporated in vacuo
7. customThe residue was then purified by silica gel column chromatography (eluent, ether:hexanes (1:30))