反应详情

To a DMF (1 ml) solution of 6-bromoquinoline-2-carboxylic acid (4000 mg, 15.9 mmol, US2005165049A1), triethylamine (6.64 ml, 47.6 mmol), N,O-dimethylhydroxyamine hydrochloride (1860 mg, 19.0 mmol) and HBTU (6620 mg, 17.5 mmol) were added and the mixture was stirred for 24 hours at room temperature. The reaction was quenched with saturated NaHCO3 aqueous solution and water, and the product was extracted with EtOAc 3 times. The combined organic extracts were dried over Na2SO4, and concentrated in vacuo. The crude residue was applied to a silica gel column chromatography and eluted with hexane/ethyl acetate (4:1) to furnish the title compound (4.29 g, 92% yield) as an orange solid. 1H NMR (300 MHz, CDCl3) δ 3.47 (3H, s), 3.80 (3H, s), 7.68-7.80 (1H, brs), 7.81-7.85 (1H, m), 8.00-8.06 (2H, m), 8.17 (1H, d, J=8.1 Hz). MS (ESI): m/z 295, 297 (M+H)+.

1. customThe reaction was quenched with saturated NaHCO3 aqueous solution and water
2. extractionthe product was extracted with EtOAc 3 times
3. dry with materialThe combined organic extracts were dried over Na2SO4
4. concentrationconcentrated in vacuo
5. washeluted with hexane/ethyl acetate (4:1)