反应详情

To a solution of ethyl 2-aminothiazol-4-ylacetate (18.6 g.) in dried methylene chloride (140 ml.) was added pyridine, and to the mixture was dropwise added a solution of mesyl chloride (17.2 g.) in dried methylene chloride (20 ml.) under ice-cooling and stirring. The mixture was further stirred for 5 hours at room temperature, and to the mixture was added a mixture of water and ethyl acetate. After adjusting the mixture to about pH 2 with 10% hydrochloric acid under ice-cooling, the precipitates were collected by filtration, washed with ethyl acetate and dried to give ethyl 2-methanesulfonamidothiazol-4-ylacetate (9.2 g.), mp 207° to 208° C.

1. temperaturecooling
2. stirringThe mixture was further stirred for 5 hours at room temperature
3. additionto the mixture was added
4. temperaturecooling
5. filtrationthe precipitates were collected by filtration
6. washwashed with ethyl acetate
7. customdried