反应详情

To a solution of 5,6-dichloro-1H-indazole (0.50 g, 2.67 mmol) in DMF (8 ml) at room temperature was added powdered potassium hydroxide (450 mg, 8.02 mmol) and iodine (1.02 g, 4.01 mmol). The maroon reaction mixture was stirred at room temperature for 45 min then quenched with 10% aqueous Na2S2O3 and diluted with water. The mixture was extracted with EtOAc (2×). The combined organics were washed with water (3×), dried over MgSO4 and concentrated to afford 827 mg (99%) of 5,6-dichloro-3-iodo-1H-indazole as a pale yellow solid. 1H NMR (DMSO-d6, 400 MHz): δ (ppm) 13.79 (s, 1H), 7.94 (s, 1H), 7.72 (s, 1H).

1. customThe maroon reaction mixture
2. customthen quenched with 10% aqueous Na2S2O3
3. additiondiluted with water
4. extractionThe mixture was extracted with EtOAc (2×)
5. washThe combined organics were washed with water (3×)
6. dry with materialdried over MgSO4
7. concentrationconcentrated