反应详情

温度

-80 °C

To a solution of 5-bromo-2-iodobenzonitrile (5.00 g, 16.00 mmoles) in anhydrous tetrahydrofuran (80 ml) at −80° C. is added diisobutyl aluminium hydride (16.0 ml, 16.0 mmoles, 1M solution in toluene) dropwise over 10 minutes. The reaction mixture is stirred at −80° C. for a 1 hour, then allowed to warm to ambient temperature and stir overnight. Additional diisobutyl aluminium hydride (16.0 ml, 16.0 mmoles, 1M solution in toluene) is next added dropwise at room temperature, and the reaction mixture further stirred for 1 hour. After careful quenching with 2M hydrochloric acid (cooling in ice bath), the crude product is extracted with ethyl acetate (×2), then all organics are combined and dried over magnesium sulfate and filtered. The filtrate is evaporated under reduced pressure then purified by flash column chromatography (isohexane to 10% ethyl acetate in isohexane eluant) to afford 5-bromo-2-iodobenzaldehyde (0.85 g).

1. temperatureto warm to ambient temperature
2. stirringstir overnight
3. stirringthe reaction mixture further stirred for 1 hour
4. customAfter careful quenching with 2M hydrochloric acid (cooling in ice bath)
5. extractionthe crude product is extracted with ethyl acetate (×2)
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. customThe filtrate is evaporated under reduced pressure
9. customthen purified by flash column chromatography (isohexane to 10% ethyl acetate in isohexane eluant)