Abstract
Abstract The syntheses of 2-(2-amino-4-thiazolyl) 2-(hydroxy or alkoxy)-imino acetic acid derivatives, with the anti (E) and syn (Z) configurations, are described. By means of these compounds, the acylation of the amino-group of 7β-amino cephalosporanic acid (7-ACA) has been achieved. The two resulting series of cephalosporin derivatives-anti and syn-are markedly different with respect to their antibiotic activity. Some of the syn compounds possess an antibacterial activity which is the highest ever observed.
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