Identification and Control of a Process-Related Impurity in the Chlorination of 3-Hydroxy-3-carbacephem
作者:Yatendra Kumar、Neera Tewari、Hashim Nizar、Bishwa Prakash Rai、Shailendra Kumar Singh
DOI:10.1021/op034026x
日期:2003.9.1
A process for the synthesis of carbacephem key intermediate (4-nitrophenyl)methyl,7-amino-1-carba(dethia)-3-chloro-3-ceph-em-4-carboxylate, monohydrochloride (1) via chlorination and deacylation employing chlorotriphenoxyphosphonium chloride [(PhO)(3)P+ClCl-] has been described. The most difficult problem encountered during the process development was the formation of an impurity 2, which has been isolated, identified, and controlled by modifying the reaction conditions.