反应详情

To a solution of benzyl 7-phenoxyacetamido-8-oxo-5-thia-1,3-diazabicyclo[4,2,0]oct-3-ene-2-carboxylate (400 mg.) in tetrahydrofuran (12 ml.) was added a solution of potassium carbonate (195 mg.) in water (12 ml.) at 0° C. After the mixture was stirred at the same temperature for an hour and at room temperature for 1.8 hours, the reaction mixture was neutralized to pH 7 with cation-exchange resin Amberlite IRC-50 (Trade Mark; manufactured by Rohm & Haas Co., Ltd.) and then filtered. The filtrate was concentrated and lyophilized to give a powder (388 mg.) of potassium 7-phenoxyacetamido-8-oxo-5-thia-1,3-diazabicyclo[4,2,0]oct-3-ene-2-carboxylate.

1. filtrationfiltered
2. concentrationThe filtrate was concentrated