反应详情

To 5 g of diethylpyridine-2,4-dicarboxylate were added 50 ml of ethanol and 50 ml of dichloroethane, followed by ice-cooling. 932 mg of sodium borohydride was added portionwise thereto, followed by stirring for 1 hour under ice-cooling, and further at room temperature for 15 hours. After ice-cooling the reaction solution, 5 ml of 6 M hydrochloric acid was added thereto, followed by stirring for 5 minutes and concentrating. A saturated aqueous sodium hydrogen carbonate solution was added thereto, followed by extracting with chloroform-isopropanol (10:1) and drying over anhydrous magnesium sulfate. After concentrating under reduced pressure, the residue was purified by silica gel column chromatography (eluent: chloroform-methanol) to obtain 0.7 g of ethyl 4-(hydroxymethyl)pyridine-2-carboxylate (Production Example 53-1) and 1.6 g of ethyl 2-(hydroxymethyl)isonicotinate (Production Example 53-2), respectively.

1. temperaturecooling
2. temperaturecooling
3. waitfurther at room temperature for 15 hours
4. additionwas added
5. stirringby stirring for 5 minutes
6. concentrationconcentrating
7. additionA saturated aqueous sodium hydrogen carbonate solution was added
8. extractionby extracting with chloroform-isopropanol (10:1)
9. dry with materialdrying over anhydrous magnesium sulfate
10. concentrationAfter concentrating under reduced pressure
11. customthe residue was purified by silica gel column chromatography (eluent: chloroform-methanol)