反应详情

2.44 g of Na2CO3 (23.0 mmol), 1.15 g of 4-formylphenylboronic acid (7.67 mmol), and 0.21 g of Pd(PPh3)4 were added to 1.68 g of 5,6-dichloro-N-ethyl-nicotinamide (5) (7.67 mmol) prepared in Example 2 dissolved in 30 mL of 1,2-dimethoxyethane and 30 mL of distilled water, and refluxed under heating and stirring for 18 hours. The mixture was cooled to room temperature, concentrated about 50% under reduced pressure to extract the aqueous layer with ethyl acetate. The organic layer was dried over magnesium sulfate, and concentrated under reduced pressure. The residue was separated by column chromatography (eluting solvent: chloroform/methanol=10/1) to obtain 5-chloro-N-ethyl-6-(4-formyl-phenyl)-nicotinamide 1.78 g (yield 80%).

1. temperatureunder heating
2. concentrationconcentrated about 50% under reduced pressure
3. extractionto extract the aqueous layer 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)