反应详情

Bromine (10.4 mL, 202 mmol) was added dropwise over 1 hour to a solution of 2-amino-3-(hydroxymethyl)pyridine (25.1 g, 202 mmol) in acetic acid (500 mL) at room temperature. After complete addition the reaction mixture was stirred for an extra hour. After concentration to dryness, the residue was partitioned between 1M Na2CO3 (750 mL) and ethyl acetate (500 mL). The aqueous layer was separated and extracted one more time with ethyl acetate (500 mL). The combined organic phases were washed with a saturated solution of sodium chloride (500 mL), dried over sodium sulfate, filtered and concentrated to dryness. After trituration of the residue in DCM/heptane and extra washing with DCM the title product was obtained as a light yellow solid (30.0 g, 70%, py 97.3%).

1. additionAfter complete addition the reaction mixture
2. concentrationAfter concentration to dryness
3. customthe residue was partitioned between 1M Na2CO3 (750 mL) and ethyl acetate (500 mL)
4. customThe aqueous layer was separated
5. extractionextracted one more time with ethyl acetate (500 mL)
6. washThe combined organic phases were washed with a saturated solution of sodium chloride (500 mL)
7. dry with materialdried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated to dryness
10. washAfter trituration of the residue in DCM/heptane and extra washing with DCM the title product
11. customwas obtained as a light yellow solid (30.0 g, 70%, py 97.3%)