反应详情

A mixture of 5-cyclopropyl-2-(4-fluorophenyl)-N-methyl-6-(methylsulfonamido)benzofuran-3-carboxamide (1.850 g, 4.60 mmol), methyl 3,5-difluoro-2-nitrobenzoate (1.996 g, 9.19 mmol) and Na2CO3 (1.462 g, 13.79 mmol) in hexamethylphosphoramide (25 mL) was stirred overnight at room temperature. The mixture was diluted with EtOAc and filtered through a pad of Celite®. The filtrate was washed with brine, dried over Na2SO4, concentrated and purified by silica gel chromatography (0-35% EtOAc in hexanes) to give methyl 5-(N-(5-cyclopropyl-2-(4-fluorophenyl)-3-(methylcarbamoyl)benzofuran-6-yl)methylsulfonamido)-3-fluoro-2-nitrobenzoate (1.61 g, 58% yield) as yellow solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 0.62 (br. s., 1H), 0.79-0.95 (m, 2H), 0.96-1.11 (m, 1H), 1.84-1.97 (m, 1H), 3.01 (d, J=5.0 Hz, 3H), 3.31-3.36 (m, 3H), 3.87 (s, 3H), 5.82 (d, J=4.6 Hz, 1H), 7.22 (t, J=8.6 Hz, 2H), 7.37-7.44 (m, 1H), 7.50-7.54 (m, 2H), 7.56 (s, 1H), 7.83-7.92 (m, 2H). LCMS (m/z, ES+)=600.2 (M+H+).

1. filtrationfiltered through a pad of Celite®
2. washThe filtrate was washed with brine
3. dry with materialdried over Na2SO4
4. concentrationconcentrated
5. custompurified by silica gel chromatography (0-35% EtOAc in hexanes)