反应详情

4 mL of 2 M lithium hydroxide solution (methanol/water=3/1) was added to 0.55 g of 3-chloro-6′-(6-morpholin-4-yl-1H-benzoimidazol-2-yl)-[2,3]bipyridinyl-5-carboxylic acid methyl ester (71) (1.22 mmol) prepared in Example 58, and stirred at room temperature for 6 hours. The mixture was concentrated under reduced pressure, dissolved in ethyl acetate, and washed with water. The organic layer was dried over magnesium sulfate, and concentrated under reduced pressure. The residue was separated by column chromatography (eluting solvent: chloroform/methanol=5/1) to obtain 0.49 g of yellow crystal, 3-chloro-6′-(6-morpholin-4-yl-1H-benzoimidazol-2-yl)-[2,3]bipyridinyl-5-carboxylic acid (yield 92%).

1. concentrationThe mixture was concentrated under reduced pressure
2. dissolutiondissolved in ethyl acetate
3. washwashed with water
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=5/1)