| 摘要 |
<p>7566-720D Disclosed are intermediates of the general formula (V) wherein R1 represents a hydrogen atom, a methyl group or an aryl group, and R2 represents a hydrogen atom or may be taken together with R1 to form a divalent carbon chain residue, or its acid addition salt. The intermediates may be used for preparing novel Ampicillin esters by reacting with phenylglycine of the formula Ph-CH(NH2)-COOH. The intermediates are prepared by reacting a compound of the formula (III) wherein R1 and R2 are as defined above, and X is a halogen atom, with a (6-protected)-aminopenicillanic acid or its salt.</p> |
