Ethyl Acetate → 2-(2-Methanesulfonamido-1,3-thiazol-4-yl)acetic acid

Beteiligte Stoffe

Reaktionsschritte

To a solution of potassium hydroxide (2.9 g.) in water (80 ml.) was added ethyl 2-methanesulfonamidothiazol-4-ylacetate (9.1 g.) under ice-cooling and stirring, and the mixture was stirred for 1 hour at room temperature. After the reaction, to the reaction mixture was added a mixture of water and ethyl acetate, and then the aqueous layer was separated. The remaining ethyl acetate layer was extracted twice with 10% hydroxide aqueous solution. The extracts were combined with the above obtained aqueous layer, and the mixture was acidified with hydrochloric acid under ice-cooling. The precipitated crystals were collected by filtration, washed with water and dried to give 2-methanesulfonamidothiazol-4-ylacetic acid (5.94 g.), mp 158°-160° C. (dec.).

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