Glutaryl 7-amino-3-vinyl-cephalosporanic acid derivatives and process for preparing it

A novel glutaryl 7-amino-3-vinyl-cephalosporanic acid derivative is provided to be used for synthesizing cephalosporin antibiotics. And a method for economically preparing thereof from glutaryl 7-aminocephalosporanic acid is provided. The glutaryl 7-amino-3-vinyl-cephalosporanic acid derivative is represented by the formula(1), where R1 is H, alkali metal or C1-10 alkyl-substituted silyl, each R2 and R3 is independently H, C1-6 alkyl, phenyl, thiazole, or C1-6 alkyl substituted thiazole.