反应详情

In a 100-mL egg plant-type flask, MeI (381 mL, 6 mmol) was added to a DMF solution (10 ml) of ethyl 3-iodo-1H-indazole-6-carboxylate (948 mg, 3 mmol) and K2CO3 (830 mg, 6 mmol), and stirred overnight at room temperature. Further, and K2CO3 (830 mg, 6 mmol) and methyl iodide (381 μL, 6 mmol) were added to it, and stirred at 50° C. for 1 hour. After the starting materials disappeared, methanol was added to the reaction solution and stirred at that temperature for 30 minutes. This was diluted with a mixed solvent of hexane and ethyl acetate, and washed with water and saturated saline water in that order, dried with sodium sulfate, filtered, concentrated and purified through silica gel column chromatography to obtain the title compound as a colorless solid.

1. stirringstirred at 50° C. for 1 hour
2. stirringstirred at that temperature for 30 minutes
3. washwashed with water and saturated saline water in that order
4. dry with materialdried with sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified through silica gel column chromatography