反应详情

Acetic acid (1 ml.) was added to a solution of 7-(2-methoxyimino-3,3-ethylenedioxybutyramido)-3-(benzothiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 500 mg.) in tetrahydrofuran (6 ml.) and water (2 ml.). Zinc powder (500 mg.) and copper sulfate 5-hydrate (50 mg.) were added to the solution at room temperature, and stirred at the same temperature for 2 hours. The resultant mixture was treated in a similar manner to that of Example 10-(3) Method A to give a mixture (120 mg.) of 7-(2-methoxyimino-3,3-ethylenedioxybutyramido)-3-methylenecepham-4-carboxylic acid (syn isomer) and 7-(2-methoxyimino-3,3-ethylenedioxybutyramido)-3-methyl-3-cephem-4-carboxylic acid (syn isomer) (5:1).