反应详情

68.1 g of ethyl 2-(2-amino-4-thiazolyl)-2-[(Z)-[(diethylcarbamoyl)methoxy]imino]-acetate are dissolved in 2.8 l of methanol and 240 ml of water and the solution is treated with 230 ml of 1N aqueous sodium hydroxide solution. The methanol is removed under reduced pressure after 48 hours and the aqueous solution is washed with ethyl acetate. After the addition of 230 ml of 1N aqueous hydrochloric acid, the crystallized acid is filtered off and dried. There are obtained 250.8 g of 2-(2-amino-4-thiazolyl)-2-[(Z)-[(diethylcarbamoyl)methoxy]imino]-acetic acid of melting point 180° C.

1. customThe methanol is removed under reduced pressure after 48 hours
2. washthe aqueous solution is washed with ethyl acetate
3. additionAfter the addition of 230 ml of 1N aqueous hydrochloric acid
4. filtrationthe crystallized acid is filtered off
5. customdried