反应详情

To a solution of 3-iodo-5-(methylsulfonyl)-1H-indazole (400 mg, 1.24 mmol) in THF (15 mL) was added t-BuOK (208 mg, 1.86 mmol) slowly at 0° C., mixture stirred for 30 minutes, then iodomethane (262 mg, 1.86 mmol) was added at 0° C., then warmed to room temperature and stirred for 2 hours. Reaction quenched with water (40 mL) and product extracted with EtOAc (3×30 mL), organics combined dried with sodium sulfate, filtered and concentrated under reduced pressure to afford a solid which was purified by column chromatography (silica gel, 200-300 mesh, eluting with dichloromethane/methanol=10:1) to give 3-iodo-1-methyl-5-(methylsulfonyl)-1H-indazole (210 mg, 50.6%) as a white solid. LCMS: (M+H)+=337; 1H NMR (300 MHz, DMSO): δ 7.97-7.94 (m, 3H), 4.13 (s, 3H), 3.26 (s, 3H).

1. stirringstirred for 2 hours
2. customReaction
3. customquenched with water (40 mL) and product
4. extractionextracted with EtOAc (3×30 mL)
5. dry with materialorganics combined dried with sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customto afford a solid which
9. customwas purified by column chromatography (silica gel, 200-300 mesh, eluting with dichloromethane/methanol=10:1)