反应详情

6-Chloronicotinic acid 1-oxide (0.347 g, 2.0 mmol) and 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline (0.544 g, 2.2 mmol) were mixed in chloroform (8 mL) at 0° C. 1-Methylpiperazine (0.30 g, 3.0 mmol) was added after 5 min and the reaction mixture was stirred for 16 h at room temperature. The solvent was removed in vacuo and the residual oil was purified on a silica gel column using chloroform/methanol/triethylamine, (100:20:1), as the eluent to give 0.18 g, (35% yield) of the title compound as a brownish solid: 1H NMR (DMSO-d6, 400 MHz) δ 8.56 (s, 1H), 7.90 (d, J=8.0 Hz, 1H), 7.39 (d, J=8.0 Hz, 1H), 3.63 (br s, 2H), 3.39 (br s, 2H), 2.43 (br s, 2H), 2.34 (br s, 2H), 2.25 (s, 3H); MS (EI) m/z 256 and 258 (M++1).

1. customThe solvent was removed in vacuo
2. customthe residual oil was purified on a silica gel column