[EN] PROCESSES FOR THE PREPARATION OF CEPHALOSPORIN DERIVATIVES<br/>[FR] PROCEDES DE PREPARATION DE DERIVES DE CEPHALOSPORINE
申请人:CJ CORP
公开号:WO2005042544A1
公开(公告)日:2005-05-12
Provided is a process for preparing a compound of formula 1 or its salt. The process includes reacting a compound of formula 4 with acetaldehyde in a mixed solvent including water, isopropanol, and methylenechloride in a volume ratio of 1:3-6:11-14 in the presence of a first base to stereospecifically prepare a compound of formula 3 and reacting the compound of the formula 3 with an anhydrous compound of formula 2 in the presence of a second base.
[EN] PROCESSES FOR THE PREPARATION OF CEPHEM DERIVATIVES<br/>[FR] PROCEDES DE PREPARATION DE DERIVES DE CEPHEME
申请人:CJ CORP
公开号:WO2005042543A1
公开(公告)日:2005-05-12
Provided is a process for preparing a compound of formula 1 or its salt, which includes reacting a compound of formula 2 with a compound of formula 3 in the presence of a base.