发明名称 |
Process for the preparation of intermediates useful in the synthesis of cephalosporins |
摘要 |
A process is described for preparing 3-exomethylene cephalosporanic acid derivatives for use in the synthesis of cephalosporin antibiotics such as ceftibuten. The process comprises electrochemical reduction of a compound of the formula (IV) <IMAGE> (IV) wherein: R3 is <IMAGE> is an optional sulfoxide group; n is 2 or 3; R1 is H and R is H or NHR2, where R2 is H or a protecting group selected from C6H5CH2OC(O)-, C6H5C(O)- or C1-C6 alkoxy-C(O)-; or wherein R and R1 together with the carbon atom to which they are attached comprise -C(O)-, and produces the desired 3-exomethylene compounds with low levels of the corresponding 3-methyl tautomers.
|
申请公布号 |
US5847116(A) |
申请公布日期 |
1998.12.08 |
申请号 |
US19960767268 |
申请日期 |
1996.12.13 |
申请人 |
SCHERING CORPORATION;ANTIBIOTICOS |
发明人 |
WALKER, DEREK;LEE, JUNNING;MARTIN, CHARLES R.;ZHANG, HAIYAN;SOGLI, LORIS;BERNASCONI, ERMANNO;MENON, VINOD PARAKKAL |
分类号 |
C07D501/00;C07D501/04;C07D501/12;C07D501/14;C07D501/18;C07D501/22;C07D501/24;C07D501/59;C25B3/04;(IPC1-7):C07D501/00 |
主分类号 |
C07D501/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|