反应详情

0.50 g of 3-chloro-6′-formyl-[2,3′]bipyridyl-5-carboxylic acid methyl ester (13) (1.81 mmol) prepared in Example 9 and 0.35 g of 4-morpholinobenzene-1,2-diamine(18) (1.81 mmol) prepared in Example 12 were dissolved in nitrobenzene (5.0 mL), and refluxed under heating for 2 hours. The reactant was cooled to room temperature, and concentrated under reduced pressure. The residue was separated by column chromatography (eluting solvent: ethyl acetate/hexane=1/1) to obtain 0.55 g of 3-chloro-6′-(6-morpholin-4-yl-1H-benzoimidazol-2-yl)-[2,3′]bipyridinyl-5-carboxylic acid methyl ester (yield 68%).

1. temperaturerefluxed
2. temperatureunder heating for 2 hours
3. concentrationconcentrated under reduced pressure
4. customThe residue was separated by column chromatography (eluting solvent: ethyl acetate/hexane=1/1)