反应详情

温度

80 °C

Methyl 3,5-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate (Step A, 2.79 g, 7.20 mmol), 1,1′-bis(di-tert-butylphoshino)ferrocene palladium dichloride (0.391 g, 0.600 mmol) and 5-bromo-2-methoxypyridine (0.776 mL, 6 mmol) were mixed in a reaction flask which was then evacuated and charged with nitrogen three times. Added 1,4-dioxane (30.0 mL) and 3.0M aqueous potassium carbonate (6.00 mL, 18.00 mmol), evacuated and charged with nitrogen (3×), then stirred overnight at 80° C. The reaction was then partitioned between ethyl acetate and water. After a second water wash, the organic was dried over sodium sulfate, filtered and evaporated. The crude was purified by silica gel chromatography, eluting with 10 column volumes of 4% ethyl acetate/hexanes followed by a gradient of 4-10% ethyl acetate/hexanes over 10 column volumes to give the title compound. 1H NMR (CDCl3, 500 MHz) δ7.94 (d, 1H), 67.79 (s, 2H), 67.36 (dd, 1H), 66.84 (d, 1H), 64.00 (s, 3H), 63.93 (s, 3H), 62.09 (s, 6H).

1. customwas then evacuated
2. additioncharged with nitrogen three times
3. additioncharged with nitrogen (3×)
4. customThe reaction was then partitioned between ethyl acetate and water
5. washAfter a second water wash
6. dry with materialthe organic was dried over sodium sulfate
7. filtrationfiltered
8. customevaporated
9. customThe crude was purified by silica gel chromatography
10. washeluting with 10 column volumes of 4% ethyl acetate/hexanes