反应详情

(5-Bromo-benzothiazol-2-yl)-acetic acid ethyl ester (1.25 g, 4.2 mmol) was dissolved in THF (20 mL) and EtOH (5 mL) under N2. Then 0.24 g of NaBH4 was dissolved in EtOH (3 mL) and added to the above solution. The reaction mixture was stirred at room temperature for 2 hours. After the completion the mixture was quenched with water and extracted with CH2Cl2. The aqueous layer was extracted again with more CH2Cl2. The combined methylene chloride layer was dried over anhydrous MgSO4 and filtered. Removal of solvent gave crude product with a yield of 1.11 g. The crude product was used directly in the next step.

1. additionadded to the above solution
2. customAfter the completion the mixture was quenched with water
3. extractionextracted with CH2Cl2
4. extractionThe aqueous layer was extracted again with more CH2Cl2
5. dry with materialThe combined methylene chloride layer was dried over anhydrous MgSO4
6. filtrationfiltered
7. customRemoval of solvent
8. customgave crude product with a yield of 1.11 g