反应详情

Ethyl 2-bromothiazole-4-carboxylate (1 g), 3-(methylsulphonyl)phenyl-boronic acid (1.02 g, 1.2 equivalents) and potassium carbonate (1.76 g) are introduced in dioxane (12.5 ml). (1,3-Diisopropylimidazol-2-ylidene)(3-chloropyridyl)palladium(II) dichloride (288 mg) is added, and the mixture is stirred under reflux under protective gas for 18 h. Dioxane is then removed in a rotary evaporator, and the residue is taken up in ethyl acetate and water. The organic phase is separated off and the aqueous phase is back-extracted twice with ethyl acetate. The combined organic phases are washed with brine and dried over sodium sulphate and concentrated. Purification by column chromatography on silica gel (ethyl acetate/hexane) results in a white solid (629 mg).

1. temperatureunder reflux under protective gas for 18 h
2. customDioxane is then removed in a rotary evaporator
3. customThe organic phase is separated off
4. extractionthe aqueous phase is back-extracted twice with ethyl acetate
5. washThe combined organic phases are washed with brine
6. dry with materialdried over sodium sulphate
7. concentrationconcentrated
8. customPurification by column chromatography on silica gel (ethyl acetate/hexane)