[EN] PROCESSES FOR THE PREPARATION OF PENEMS AND ITS INTERMEDIATE<br/>[FR] PROCEDES DE PREPARATION DE PENEMES ET DE LEURS INTERMEDIAIRES
申请人:RANBAXY LAB LTD
公开号:WO2007004028A2
公开(公告)日:2007-01-11
[EN] The present invention relates to a process for the preparation of 4-acetoxy azetidinone of Formula I, wherein R2 is hydrogen or a suitable amino protecting group and P is suitable hydroxy protecting group, and to the use of these compounds as intermediates for the preparation of ß-lactam antibiotics that possess the carbapenem and penem ring systems. 4-acetoxy azetidinone of Formula I is a key intermediate in the synthesis of ß-lactam antibiotics which are commonly prescribed antimicrobial agents having activity against a wide range of both Gram-positive and Gram-negative bacteria. [FR] La présente invention concerne un procédé de préparation de 4-acétoxy-azétidinone de formule (I), dans laquelle R2 est hydrogène ou un groupe amino-protecteur approprié et P est un groupe hydroxy-protecteur approprié, ainsi que l'utilisation de ces composés comme intermédiaires pour la préparation d'antibiotiques de ß-lactame renfermant les systèmes cycliques carbapénème et pénème. La 4-acétoxy-azétidinone de formule (I) est un intermédiaire clé dans la synthèse d'antibiotiques de ß-lactame, lesquels sont des agents antimicrobiens communément prescrits dont l'activité est dirigée contre un large éventail de bactéries gram-positives et gram-négatives.
WO2007/4028
申请人:——
公开号:——
公开(公告)日:——
Practical synthetic approach to 4-acetoxy-2-azetidinone for the preparation of carbapenem and penem antibiotics
作者:Guo-Bin Zhou、Yue-Qing Guan、He Tang、Yan-Bin Zhao、Li-Rong Yang
DOI:10.1007/s11164-011-0344-5
日期:2012.1
A practical synthesis of 4-acetoxy-2-azetidinone useful for the preparation of carbapenem- and penem-type antibiotics is described. The synthesis has advantages such as avoiding the tedious and costly column chromatographic or recrystallized separation steps for diastereomers. The overall yield of the product is greatly improved and the process is also more economical for large-scale production. In addition, the mechanism for oxidative decarboxylation is also present.