反应详情

温度

200 °C

N-(4-Chlorobenzyl)-6-iodo-7-methoxy-1-methyl-4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamide (150 mg) is mixed with pyridine hydrochloride (1.50 g). The resulting solid is heated at 200° C. for 1 h, then cooled to room temperature and washed with MeOH. The residue is then dissolved in CH2Cl2, washed with 1N HCl, brine, dried (MgSO4), filtered and concentrated in vacuo. The crude product is purified by silica gel chromatography (CH2Cl2/MeOH 19/1, 9/1) to afford 60 mg (56%) of N-(4-chlorobenzyl)-1-methyl-4,7-dioxo-1,4,7,8-tetrahydro[1,8]naphthyridine-3-carboxamide. Physical characteristics are as follows: 1H NMR (DMSO-d6) δ 8.85, 8.44, 7.42-7.33, 6.82, 4.55, 3.92; IR (diffuse reflectance) 3044, 2350, 2318, 1941, 1908, 1679, 1645, 1627, 1553, 1524, 1504, 1466, 803, 672, 656, cm−1.

1. temperaturecooled to room temperature
2. washwashed with MeOH
3. dissolutionThe residue is then dissolved in CH2Cl2
4. washwashed with 1N HCl, brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude product is purified by silica gel chromatography (CH2Cl2/MeOH 19/1, 9/1)