反应详情

A mixture of 2.5 g of 4-bromo-1-nitro-2-(propan-2-yloxy)benzene, 2.58 g of 3-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine, 9.4 g of caesium carbonate and 703 mg of [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II), in 27 ml of dioxane and 8.8 ml of water, is microwave-heated at 130° C. for 20 minutes. The mixture is diluted with ethyl acetate and water. The aqueous phase is extracted with ethyl acetate (2×) and then with dichloromethane (2×10 ml). The combined organic phases are dried over magnesium sulfate and concentrated under vacuum. The residue is purified on 100 g of silica, elution being carried out with heptane/ethyl acetate (50/50 to 0/100), so as to obtain 2.63 g of 3-methoxy-4-[4-nitro-3-(propan-2-yloxy)phenyl]pyridine in the form of a brown solid.

1. extractionThe aqueous phase is extracted with ethyl acetate (2×)
2. dry with materialThe combined organic phases are dried over magnesium sulfate
3. concentrationconcentrated under vacuum
4. customThe residue is purified on 100 g of silica, elution