反应详情

In a schlenck tube, a mixture of 2-bromo-3-methyl-5-nitropyridine (4.6 mmol, 1.0 g), phenylboronic acid (4.6 mmol, 0.560 g), PdCl2dppf.DCM (0.47 mmol, 0.4 g), Cs2CO3 (13.8 mmol, 4.5 g) in a dioxane/water 4:1 mixture (18 ml) was heated at 100° C. for 14 hours, under argon atmosphere. The solvent was evaporated and the crude mixture was extracted between water and ethyl acetate. The solid residue was purified by chromatography over SiO2 eluting with hexane/ethyl acetate mixtures affording 3-methyl-5-nitro-2-phenylpyridine (0.95 g, yield 97%) as major product.

1. customThe solvent was evaporated
2. extractionthe crude mixture was extracted between water and ethyl acetate
3. customThe solid residue was purified by chromatography over SiO2 eluting with hexane/ethyl acetate