反应详情

To a solution of 2-amino-2-(3,4-difluorophenyl)-ethanol 2.6 g, 15.0 mmol) in CH2Cl2 (15 mL) and 20% (by wt.) NaOH (15 mL) was added a solution of chloroacetyl chloride (1.32 mL, 16.5 mmol) in 15 mL of CH2Cl2 at −10° C. dropwise under argon atmosphere. After the addition was complete, the reaction mixture was stirred for 15 min and then it was transferred to a separatory funnel. The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (2×20 mL). The combined organic extracts were washed with a solution containing 10 mL of brine and 5 drops of concentrated HCl. The organic layer was dried over MgSO4, filtered and the solvent was removed in vacuo to give a white solid. It was further purified with flash column chromatography on silica gel with 1:1 hexane/EtOAc followed by EtOAc as the eluting system. 2-Chloro-N-[1-(3,4-difluoro-phenyl)-2-hydroxy-ethyl]-acetamide was obtained as a white solid (2.6 g, 69.5% yield).

1. additionAfter the addition
2. customit was transferred to a separatory funnel
3. customThe organic layer was separated
4. extractionthe aqueous layer was extracted with CH2Cl2 (2×20 mL)
5. washThe combined organic extracts were washed with a solution
6. additioncontaining 10 mL of brine and 5 drops of concentrated HCl
7. dry with materialThe organic layer was dried over MgSO4
8. filtrationfiltered
9. customthe solvent was removed in vacuo
10. customto give a white solid
11. customIt was further purified with flash column chromatography on silica gel with 1:1 hexane/EtOAc