反应详情

Ethyl 2-amino-6-bromo-1-benzothiophene-3-carboxylate (9.0 g, 27 mmol), formamide (85 mL) and ammonium formate (2.7 g, 43 mmol) were heated in an oil bath at 135° C. overnight. The next morning the reaction mixture was a pastel blue slurry. The reaction mixture was allowed to cool to room temperature and was then filtered. The solid was washed with water, dried by filtration, and finally dried in a vacuum oven overnight at 45° C. to yield a light blue solid (7.8 g, quantitative). 1H NMR (DMSO-d6) δ 12.9 (br, 1H), 8.37 (s, 1H), 8.35 (d, 1H), 8.31 (s, 1H), 7.69 (d, 1H); LCMS RT=3.08 min, [M+H]+=281.1.

1. filtrationwas then filtered
2. washThe solid was washed with water
3. customdried by filtration
4. customfinally dried in a vacuum oven overnight at 45° C.
5. customto yield a light blue solid (7.8 g, quantitative)