反应详情

A mixture of 10.0 g of 4-bromo-1-nitro-2-(propan-2-yloxy)benzene, 5.78 g of 4-pyridylboronic acid, 12.2 g of sodium carbonate and 1.0 g of bis(triphenylphosphine)dichloropalladium, in 200 ml of dioxane and 35 ml of water, is heated at 110° C. (bath) for 9 h. The mixture is diluted with ethyl acetate and water. The aqueous phase is extracted twice with ethyl acetate and then with dichloromethane. The combined organic phases are dried over magnesium sulfate and concentrated under vacuum. The residue is purified on 330 g of silica, elution being carried out with ethyl acetate/heptane (1/1 to 4/1), so as to obtain 7.35 g of 4-[4-nitro-3-(propan-2-yloxy)phenyl]pyridine in the form of a pale yellow solid.

1. extractionThe aqueous phase is extracted twice with ethyl acetate
2. dry with materialThe combined organic phases are dried over magnesium sulfate
3. concentrationconcentrated under vacuum
4. customThe residue is purified on 330 g of silica, elution