反应详情

温度

100 °C

A mixture of ethyl 5-bromo-benzofuran-2-carboxylate 15 (6 g, 22.3 mmole), diethyl 3-pyridylborane (3.66 g, 25 mmole), tetrakis(triphenylphosphine)palladium (0) (270 mg), and potassium phosphate (11.4 g, 53.7 mmole) in DMF (60 ml) was stirred under an argon atmosphere and heated to 100° C. for 16 hrs. The mixture was allowed to cool to room temperature, poured into ethyl acetate and washed with 10% HCl. The organic layer was washed with brine, dried, and evaporated to give 10.4 g of 5-pyridin-3-yl-benzofuran-2-carboxylic acid methyl ester. 534 mg the carboxylic ester were then dissolved in 11 ml t-butanol and stirred under nitrogen. Addition of 198 mg NaBH4 followed by 1.75 ml methanol and the reaction was stirred at 55° C. overnight. After cooling, the reaction was poured into brine and extracted with ethyl acetate. The organic layer was dried and evaporated. The residue was purified by chromatography to give 330 mg of (5-pyridin-3-yl-benzofuran-2-yl)-methanol 61.

1. temperatureto cool to room temperature
2. washwashed with 10% HCl
3. washThe organic layer was washed with brine
4. customdried
5. customevaporated