反应详情

温度

120 °C

The 1-(4-bromo-2-hydroxy-5-methylphenyl)ethanone (8.5 g, 37 mmol, Alfa Aesar catalog#H29125) was combined with zinc cyanide (8.7 g, 74 mmol) in N,N-dimethylformamide (75 mL) degassed with nitrogen and the tris(dibenzylideneacetone)dipalladium(0) (Aldrich Catalog No. 328774) (1.0 g, 1.1 mmol) and (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine) (Aldrich Catalog No. 526460) (1.5 g, 2.6 mmol) were added. The reaction was degassed again with nitrogen and heated to 120° C. and monitored by LC/MS. After heating for 18 hrs the reaction was complete, the reaction was allowed to cool to room temperature, taken up in ethyl acetate and washed with water (2×), brine, dried over magnesium sulfate and concentrated to give the crude product as a dark amber oil. The product was purified by FCC on silica gel eluting hexane:ethyl acetate gradient to give 4-acetyl-5-hydroxy-2-methylbenzonitrile as a solid (6.3 g, 98%). LCMS calculated for C10H10NO2(M+H)+: m/z=176.1; found: 176.2.

1. customdegassed with nitrogen
2. customThe reaction was degassed again with nitrogen
3. temperatureAfter heating for 18 hrs the reaction
4. temperatureto cool to room temperature
5. washwashed with water (2×), brine
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated
8. customto give the crude product as a dark amber oil
9. customThe product was purified by FCC on silica gel
10. washeluting hexane