反应详情

温度

0 °C

To a solution of 4-iodo-2-methyl-1H-imidazole (162 mg, 0.78 mmol) in THF (2.6 mL, 0.3M) containing DIEA (0.33 mL, 1.95 mmol) and DMAP (47 mg, 0.039 mmol), cooled in a ice bath at 0° C., was added a solution of Ethyl chloroformate (211 mg, 1.95 mmol) in THF (2 mL, 1M). The reaction mixture was heated at 50° C. for 48 h and then concentrated. The residue was dissolved in DCM and the organic layer was washed with saturated NaCl, dried over magnesium sulfate, filtered and evaporated. The crude product was purified by flash chromatography (Prepacked column 10 g, DCM/MeOH: 97/3 as eluent) to afford 208 mg of ethyl 4-iodo-2-methyl-1H-imidazole-1-carboxylate (95%) as colorless oil.

1. temperatureThe reaction mixture was heated at 50° C. for 48 h
2. concentrationconcentrated
3. dissolutionThe residue was dissolved in DCM
4. washthe organic layer was washed with saturated NaCl
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customevaporated
8. customThe crude product was purified by flash chromatography (Prepacked column 10 g, DCM/MeOH: 97/3 as eluent)