反应详情

Under an atmosphere of nitrogen, a solution of 5-bromo-6-(cyclopropylmethoxy)-pyridine-2-carboxylic acid (300 mg, 1.1 mmol), 2-(3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (278 mg, 1.3 mmol), 1,1′-bis(diphenylphosphino) ferrocene-palladium(II)dichloride methylene chloride complex (CAN 95464-05-4, 45 mg, 0.06 mmol) and sodium carbonate (964 mg, 9.1 mmol) in DMF (10 mL) was heated to 100° C. overnight. The reaction mixture was poured into water, extracted with ethyl acetate (30 mL), the pH of the aqueous layer was adjusted to 2 by addition of 1 N hydrochloric acid and the resulting mixture was extracted with ethyl acetate (3×30 mL). The combined organic extracts were washed six times with brine, dried over anhydrous sodium sulfate and evaporated. The residue was purified by column chromatography (silica gel, 8 g, 30% ethyl acetate in petroleum ether) to yield the title compound (0.15 g, 1 mmol, 49.4%) as white solid; MS (EI): m/e 276.0 [M+H]+.

1. extractionextracted with ethyl acetate (30 mL)
2. additionthe pH of the aqueous layer was adjusted to 2 by addition of 1 N hydrochloric acid
3. extractionthe resulting mixture was extracted with ethyl acetate (3×30 mL)
4. washThe combined organic extracts were washed six times with brine
5. dry with materialdried over anhydrous sodium sulfate
6. customevaporated
7. customThe residue was purified by column chromatography (silica gel, 8 g, 30% ethyl acetate in petroleum ether)