| 摘要 |
<p>Process for the Manufacture of Enol Derivatives 7.beta.-amino-3-cephem-3-ol-4-carboxylic acid compounds of the formula (IA) wherein R? represents an acyl group, R2 represents hydroxyl or a radical R? which together with the carbonyl grouping-C(=O)- forms a protected carboxyl group and R3 represents hydrogen, lower alkyl, phenyl-lower alkyl, diphenyl-lower alkyl or tri-lower alkyl silyl, and the corresponding 2-cephem compounds are prepared in that a compound of the formula,</p> |
