反应详情

To a solution of ethyl 2-(4-chloro-5-iodo-2-methoxyphenylamino)acetate (8.6 g, 22.9 mmol) in THF (50 mL) and water (50 mL), LiOH.H2O (1.96 g, 45.9 mmol) was added and the resulting mixture was stirred at room temperature for 2 h. The mixture was washed with 20% ethyl acetate/petroleum ether. The aqueous layer was acidified with aqueous HCl (1 M) to adjust PH to 3-4 and extracted with ethyl acetate. The organic layer was dried over MgSO4, filtered, and concentrated in vacuo to afford the desired product (5 g, 64% yield).

1. washThe mixture was washed with 20% ethyl acetate/petroleum ether
2. extractionextracted with ethyl acetate
3. dry with materialThe organic layer was dried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo