Dimethylformamide → (6R)-8-Oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

Beteiligte Stoffe

Reaktionsschritte

A solution of 7-amino-3-cephem-4-carboxylic acid (1.0 g.) and trimethylsilylacetamide (3.8 g.) in ethyl acetate (10 ml.) and a solution of 2-[2-(2,2,2-trifluoroacetamidothiazol-4-yl)]-2-(2,4-dichlorobenzyloxyimino)acetic acid (syn isomer, 2.0 g.), phosphoryl chloride (0.9 g.) and N,N-dimethylformamide (0.43 g.) in ethyl acetate (16 ml.) were treated in a similar manner to that of Example 1-(1) to give 7-[2-(2,2,2-trifluoroacetamido)thiazol-4-yl]-2-(2,4-dichlorobenzyloxyimino)acetamido]-3-cephem-4-carboxylic acid (syn isomer, 2.3 g.).

Herkunft & Nachweise