反应详情

7-Chloro-6-phenylamino-3H-benzoimidazole-5-carboxylic acid methyl ester 7c (0.327 g, 1.08 mmol) is dissolved into DMF (16 mL) and NBS (0.193 g, 1.08 mmol) is added. After one hour, the reaction mixture is quenched by the addition of saturated aqueous NaHSO3. The reaction mixture is then partitioned between EtOAc/THF and water. The organic layer is washed with water and brine. The combined organic extracts are dried (Na2SO4) and concentrated under reduced pressure. The recovered solid is triturated with ether to give 0.225 g (54%) pure desired product. MS ESI (+) m/z 382, 384 (M+, Br pattern) detected.

1. additionis added
2. customthe reaction mixture is quenched by the addition of saturated aqueous NaHSO3
3. customThe reaction mixture is then partitioned between EtOAc/THF and water
4. washThe organic layer is washed with water and brine
5. dry with materialThe combined organic extracts are dried (Na2SO4)
6. concentrationconcentrated under reduced pressure
7. customThe recovered solid is triturated with ether