反应详情

In 50 ml of dimethylformamide is dissolved 7.41 g of ethyl 2-(2-tritylaminothiazol-4-yl)-(Z)-2-hydroxyiminoacetate hydrochloride and with stirring at room temperature, 4.15 g of potassium carbonate and 2.75 g of 1-bromo-2-(2-methoxyethoxy)ethane are added. The mixture is stirred for 48 hours, after which it is poured into 500 ml of ice water and extracted with ethyl acetate. The extract is washed with water, dried over magnesium sulfate and concentrated under reduced pressure. The residue is chromatographed on silica gel (150 g) column and elution is carried out with hexane-ethyl acetate (1:1). The fractions rich in the desired compound are pooled and concentrated under reduced pressure to give 4.84 g of ethyl 2-(2-tritylaminothiazol4-yl)-(Z)-2-[2-(2-methoxyethoxy)ethoxyimino]acetate as a yellow foamy product.

1. stirringThe mixture is stirred for 48 hours
2. extractionextracted with ethyl acetate
3. washThe extract is washed with water
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue is chromatographed on silica gel (150 g) column and elution
7. concentrationconcentrated under reduced pressure