反应详情

To a solution of 1H-pyrazolo[3,4-b]pyridine (500.0 mg, 4.2 mmol, 1 equiv) in DMF (10 mL) at 0° C., was added iodine (2.13 g, 8.4 mmol, 2 equiv) and potassium hydroxide (943 mg, 16.8 mmol, 4 equiv). The resultant mixture was allowed to warm to room temperature and stirred for 1 hour. The reaction solution was slowly quenched with saturated sodium thiosulfate (Na2S2O5) solution (10 mL), and extracted with ethyl acetate (2×200 mL). The combined organic layers were washed with water (3×50 mL), brined (50 mL), dried over sodium sulfate and concentrated in vacuo to give 3-Iodo-1H-pyrazolo[3,4-b]pyridine (1.02 g) as a yellow powder which was used without further purification: LCMS (ES) M+H 246.2, Rf 2.17 min (Agilent Zorbax SB-C18, 2.1×50 mm, 5μ, 35° C., 1 ml/min flow rate, a 2.5 min gradient of 20% to 100% B with a 1.1 min wash at 100% B; A=0.1% formic acid/5% acetonitrile/94.9% water, B=0.1% formic acid/5% water/94.9% acetonitrile).

1. customThe reaction solution was slowly quenched with saturated sodium thiosulfate (Na2S2O5) solution (10 mL)
2. extractionextracted with ethyl acetate (2×200 mL)
3. washThe combined organic layers were washed with water (3×50 mL)
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated in vacuo