反应详情

温度

-78 °C

2,2,2-trifluoro-N-(6-fluoro-3-iodoimidazo[1,2-a]pyridin-2-yl)acetamide (500 g, 0.00134 mol) was dissolved in tetrahydrofuran (16 mL) and was cooled at −78° C. N-Butyllithium (2 molarin cyclohexane, 1.6 mL) was added and the reaction was warmed to −20 for 15 minutes then chilled to 78° C. Methyl iodide (110 uL, 0.0017 mol) was added and the reaction was allowed to warm to room temperature. The reaction was poured into ice water and extracted with ethyl acetate (3×50 mL). The combined organics were dried (magnesium sulfate) and solvent removed. Residue chromatographed on silica (50% ethyl acetate/hexanes) to give 2,2,2-trifluoro-N-(6-fluoro-3-methylimidazo[1,2-a]pyridin-2-yl)acetamide 5 Rf 0.47, 50% ethyl acetate/hexanes; MS m/z 262 (M+H).

1. temperaturethe reaction was warmed to −20 for 15 minutes
2. temperaturethen chilled to 78° C
3. temperatureto warm to room temperature
4. extractionextracted with ethyl acetate (3×50 mL)
5. dry with materialThe combined organics were dried (magnesium sulfate) and solvent
6. customremoved
7. customResidue chromatographed on silica (50% ethyl acetate/hexanes)