反应详情

To a stirred solution of tert-butyl ethyl (4-(thiophen-2-yl)-1,2-phenylene)dicarbamate (0.10 g, 0.28 mmol, 1.0 equiv.) in MeOH (2 mL) at 0° C. was added a 4M solution of HCl in dioxane (1.5 mL). The reaction was warmed to room temperature and stirred for 2 h, The reaction was concentrated under reduced pressure. A saturated aqueous solution of sodium bicarbonate was added. The obtained solid was filtered, washed with water and dried. The crude material was purified by column chromatography (silica gel, 15% EtOAc/hexanes) to give ethyl (2-amino-5-(thiophen-2-yl)phenyl)carbamate (0.05 g, 69% yield).

1. concentrationThe reaction was concentrated under reduced pressure
2. additionA saturated aqueous solution of sodium bicarbonate was added
3. filtrationThe obtained solid was filtered
4. washwashed with water
5. customdried
6. customThe crude material was purified by column chromatography (silica gel, 15% EtOAc/hexanes)