反应详情

0.29 of Na2CO3 (0.273 mmol), 0.25 g of 6-methylpyridin-3-ylboronic acid (11) (0.18 mmol) and 0.11 g of Pd(PPh3)4 were added to 0.4 g of 5,6-dichloro-nicotinic acid methyl ester (10) (0.2 mmol) prepared in Example 7 dissolved in 14 mL of 1,2-dimethoxyethane and 7 mL of distilled water, and refluxed under heating and stirring for 18 hours. The mixture was cooled to room temperature, and concentrated about 50% under reduced pressure. The aqueous layer was extracted with ethyl acetate, and the organic layer was dried over magnesium sulfate, concentrated under reduced pressure. The residue was separated by column chromatography (eluting solvent: chloroform/methanol=10/1) to obtain 0.42 g of 3-chloro-6′-methyl-[2,3′]bipyridyl-5-carboxylic acid methyl ester (yield 88%).

1. temperatureunder heating
2. concentrationconcentrated about 50% under reduced pressure
3. extractionThe aqueous layer was extracted with ethyl acetate
4. dry with materialthe organic layer was dried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was separated by column chromatography (eluting solvent: chloroform/methanol=10/1)