Water → HCID 68194082、化合物

To a solution of methyl 2-(4-fluorophenyl)-3-(1,2,3,4-tetrahydroquinolin-1-yl)quinoxaline-6-carboxylate (300 mg, 0.73 mmol) in N,N-dimethylformamide (20 ml) was added NBS (193 mg, 1.08 mmol) under an inert atmosphere of nitrogen. The resulting solution was stirred for 1.5 h at −10° C. Then water (150 ml) was added and the reaction was extracted with ethyl acetate (3×50 ml). The organic layers were combined, dried over anhydrous magnesium sulfate and concentrated in vacuo to give a residue, which was purified by silica gel chromatography eluting with 1%-2% ethyl acetate in petroleum ether to afford methyl 3-(6-bromo-1,2,3,4-tetrahydroquinolin-1-yl)-2-(4-fluorophenyl)quinoxaline-6-carboxylate as a yellow solid (200 mg, 56%).