Novel bicyclic .beta.-lactams and intermediates useful in their preparation are disclosed. In particular, 7.beta.-acyl-amino- and 7.beta.-amino-8-oxo-4-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acids are prepared. The acylated compounds are antibacterial agents.
Methods and intermediates for preparing cis-4-oxoazetidine intermediates
申请人:SmithKline Corporation
公开号:US04166816A1
公开(公告)日:1979-09-04
The stereospecific cycloaddition of nitrogen containing acetic acid halides or anhydrides with Schiff bases having a carbalkoxy group substituted on the methine carbon atom offers new intermediates and methods for preparing synthetic cephalosporin congeners having antibacterial activity.
Cis-4-oxoazetidine intermediates and methods of preparing them
申请人:SmithKline Corporation
公开号:US04072674A1
公开(公告)日:1978-02-07
The stereospecific cycloaddition of nitrogen containing acetic acid halides or anhydrides with Schiff bases having a carbalkoxy group substituted on the methine carbon atom offers new intermediates and methods for preparing synthetic cephalosporin congeners having antibacterial activity.
Syntheses of New Isocephems and Isodethiaoxacephems as Antimicrobial Agents
作者:Gholam H. Hakimelahi、Jih Ru Hwu、Shwu-Chen Tsay、Zahra Ramezani、Jih Ru Hwu
DOI:10.1002/hlca.19960790323
日期:1996.5.8
The cis-configurated isocephem 26 as well as isodethiaoxacephems 21 and 33 were synthesized (Schemes 4 and 5). The key step involves chlorination of the corresponding carbanions of 23, 18, and 31 with CF3SO2Cl followed by internal alkylation. β-Lactams 3, 21, 26, and 33 were found to possess biological activity against several pathogenic microorganisms in vitro. Electronic activation of the lactam
的顺式-构型异头孢烯26以及isodethiaoxacephems 21和33合成(方案4和5)。的关键步骤涉及的相应的碳负离子的氯化23,18,和31与CF 3 SO 2氯随后内部烷基化。β内酰胺3,21,26,和33被发现具有抗几种病原性微生物的生物活性在体外。异噻唑烷酮33中内酰胺部分的电子活化显着增强了其生物活性。