反应详情

Cyclopropanol (542 μL, 8.69 mmol) is added to a suspension of methyl 5-chloropyrazine-2-carboxylate (1.0 g, 5.79 mmol) and potassium carbonate (1.60 g, 11.59 mmol) in dimethylformamide (11.6 mL). The reaction mixture is stirred for 15 hours at room temperature then for 24 hours at 50° C. The reaction is cooled to ambient temperature, diluted with water, and extracted with ethyl acetate (3 times). The organic layers are combined, dried over sodium sulfate, filtered, and concentrated under reduced pressure to give a brown oil. The crude product is purified by silica gel flash chromatography, eluting with ethyl acetate/hexane (0:100) to ethyl acetate/hexane (35:65) to give the title compound (610 mg, 54%). ES/MS (m/e): 195.0 (M+1).

1. waitfor 24 hours at 50° C
2. temperatureThe reaction is cooled to ambient temperature
3. extractionextracted with ethyl acetate (3 times)
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customto give a brown oil
8. customThe crude product is purified by silica gel flash chromatography
9. washeluting with ethyl acetate/hexane (0:100) to ethyl acetate/hexane (35:65)