反应详情

To a solution of 4-fluoro-5-((2-fluoro-4-iodophenyl)amino)benzo[d]oxazole-6-carboxylic acid (70 mg, 0.17 mmol) in t-BuOH (3 mL) was added DPPA (82 mg, 0.29 mmol) followed by triethylamine (36 mg, 0.36 mmol). The mixture was heated under reflux for 3 h and allowed to slowly warm to room temperature. The solvent was removed in vacuo and the resultant crude product was purified by column chromatography on silica gel (petroleum ether/ethyl acetate, 2:1, v/v). The corresponding product was obtained (white solid, 62 mg, 89.2% yield). 1H NMR (400 MHz, DMSO-d6): δ 11.75 (s, 1H), 8.67 (s, 1H), 7.96 (d, 1H), 7.76 (d, 1H), 7.50 (m, 1H), 7.39 (s, 1H).

1. temperatureThe mixture was heated
2. temperatureunder reflux for 3 h
3. customThe solvent was removed in vacuo
4. customthe resultant crude product was purified by column chromatography on silica gel (petroleum ether/ethyl acetate, 2:1
5. customThe corresponding product was obtained (white solid, 62 mg, 89.2% yield)