| abstract |
(57) [Problem] To provide a novel intermediate for producing cephalosporin containing a substituted benzyloxyimino group at the 7-position. SOLUTION: The following general formula (VIII): [Wherein, R 1p, R 2p, represents R 3p, R 4p and R 5p each radical R 1, R 2, R 3, meaning or protected reactive functional group of R 4 and R 5, R 6 Represents a base in the form of a quaternary ammonium, R 7 represents the residue of an easily cleavable ester, R 8 represents a hydrogen atom or a protecting group for an amine function, and R 9 represents an easily cleavable ester. Which represents the residue of the formula: |