反应详情

To a mixture of 0.78 g of 2-(3-iodopyridin-4-yl)-5-(trifluoromethyl)benzoxazole, 0.27 g of phenylboronic acid, 5 ml of tetrahydrofuran and 0.14 g of dichlorobis(triphenylphosphine)palladium (II), 3 ml of 10% aqueous solution of sodium hydroxide was added and heated to reflux for three hours. Water was added to the reaction mixture, followed by extraction with ethyl acetate twice. The combined organic layers were washed with water and a saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.18 g of 2-(3-phenyl pyridin-4-yl)-5-(trifluoromethyl)benzoxazole (hereinafter, referred to as “active compound 32”).

1. additionwas added
2. temperatureheated
3. temperatureto reflux for three hours
4. extractionfollowed by extraction with ethyl acetate twice
5. washThe combined organic layers were washed with water
6. dry with materiala saturated sodium chloride solution, dried over anhydrous magnesium sulfate
7. concentrationconcentrated under reduced pressure