Phosphorus oxychloride → 7-[2-(2-Formamidothiazol-4-yl)-2-(2-methylthiazol-4-yl methoxyimino)acetamido]-3-cephem-4-carboxylic acid

Participants

Reaction Steps

2-(2-Formamidothiazol-4-yl)-2-(2-methylthiazol-4-yl-methoxyimino)acetic acid (syn isomer, 0.50 g.), N,N-dimethylformamide (0.123 g.), phosphoryl chloride (0.259 g.) and ethyl acetate (6 ml.) were treated in a similar manner to that of Example 1-(1) to give an activated acid solution. The solution and a solution of 7-amino-3-cephem-4-carboxylic acid (0.306 g.), trimethylsilylacetamide (1.03 g.), and bis-(trimethylsilyl)acetamide (0.90 ml.) in ethyl acetate (3 ml.) were treated in a similar manner to that of Example 1-(1). Water (10 ml.) was added to the resultant mixture, and the ethyl acetate layer was separated, washed with a saturated aqueous solution of sodium chloride, dried over magnesium sulfate and then evaporated in vacuo to give 7-[2-(2-formamidothiazol-4-yl)-2-(2-methylthiazol-4-yl-methoxyimino)acetamido]-3-cephem-4-carboxylic acid (syn isomer, 0.48 g.)

Provenance & Evidence