Water → HCID 10870340, compound

Participants

Reaction Conditions

Reaction Steps

In 200 ml of acetone was suspended 10 g (0.0341 mole) of methylsulfonylethyl 2-(2-aminothiazol-4-yl)-(Z)-2-hydroxyiminoacetate as obtained in Example 3. After a serial addition of 9.98 g (0.0512 mole) of t-butyl bromoacetate, 0.6 ml of water and 18.85 g of anhydrous potassium carbonate, the mixture was stirred at 40° C. for 2 hours followed by addition of 200 ml of water. The mixture was stirred at 30°-35° C. for about an hour, whereby the methylsulfonylethyl group was hydrolytically eliminated. Then, the ethyl acetate was added to the hydrolysis reaction mixture. The organic layer was extracted with water and the aqueous layers were combined and adjusted to pH 2 with 2N HCl. The resulting white crystalline precipitate was collected by filtration and dried to give 9.0 g of 2-(2-aminothiazol-4-yl)-(Z)-2-(t-butoxycarbonylmethoxyimino)acetic acid. (Yiled, 87.6%)

Provenance & Evidence