反应详情

To a stirred solution of 5-methoxy-4-nitropicolinic acid (1 g, 0.005 mol) in DMF (10 mL) were added (S)-(3-fluoro-4-(trifluoromethoxy)phenyl)(3-fluoropyridin-2-yl)methanamine hydrochloride (1.8 g, 0.0055 mol, Intermediate 6), HATU (2.8 g, 0.0075 mol, molekula, India) and DIPEA (2.4 g, 0.02 mol, Aldrich). The reaction mixture was stirred for 12 h at rt. The reaction progress was monitored by TLC (50% EtOAc in pet ether). After completion of reaction, water (10 mL) was added and product was extracted with EtOAc (50 mL×3) and concentrated to get initial product. The product thus obtained was purified by column chromatography, silica gel (60-120 mesh), using 80-100% EtOAc in petroleum ether as the eluent to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.74 (d, J=7.6 Hz, 1H), 8.94 (s, 1H), 8.56 (d, J=4.8 Hz, 1H), 8.38 (s, 1H), 7.82 (t, J=8.8 Hz, 1H), 7.57-7.53 (m, 3H), 7.35 (d, J=8.8 Hz, 1H), 6.55 (d, J=7.2 Hz, 1H), 4.16 (s, 3H). MS (ESI, positive ion) m/z: 485.1 (M+H).

1. additionwas added
2. extractionproduct was extracted with EtOAc (50 mL×3)
3. concentrationconcentrated
4. customto get initial product
5. customThe product thus obtained
6. customwas purified by column chromatography, silica gel (60-120 mesh)