反应详情

温度

60 °C

To a stirring solution of 2-chloro-5-[5-(3-chlorothiophen-2-yl)-[1,2,4]oxadiazol-3-yl]-phenylamine (0.121 g, 0.386 mmol), (dimethylamino)acetaldehyde diethyl acetal (0.720 mL, 3.94 mmol), glacial acetic acid (24.0 mL) and water (0.100 mL, 5.55 mmol) was added sodium cyanoborohydride (0.140 g, 2.22 mmol). The solution was heated at 60° C. for 5 days and then the solution was stirred at room temperature until a precipitate formed. The suspension was filtered, the filter cake was washed with EtOAc (10 mL) and then the filtrate was concentrated by rotary evaporation. The residue was purified by flash column chromatography (silica gel, elution with EtOAc:hexanes, 1:3.5), gave 0.027 g (20%) of the title compound as a white solid. 1H NMR (CDCl3): 7.60 (d, 1H, J=5.2 Hz), 7.44–7.35 (m, 3H), 7.13 (d, 1H, J=5.2 Hz), 4.33 (br s, 1H), 3.37–3.28 (m, 2H), 1.36 (t, 3H, J=7.1 Hz).

1. customformed
2. filtrationThe suspension was filtered
3. washthe filter cake was washed with EtOAc (10 mL)
4. concentrationthe filtrate was concentrated by rotary evaporation
5. customThe residue was purified by flash column chromatography (silica gel, elution with EtOAc:hexanes, 1:3.5)