Abstract:
:Naturally occurring carbapenem antibiotics having a double bond in the side chain, when refluxed in chloroform containing quarternary alkylammonium halides, were converted into Z isomers in high yields. The mechanism of this new equilibration involves intramolecular proton transfer from the carboxylic acid to the carbon alpha to the sulfur atom in the side chain as shown by deuterium-labeling experiments. Some Z isomers showed stronger protective effects in mice infected by Escherichia coli O-111 and more potent synergistic activities with cefotiam in mice infected by Proteus vulgaris GN4815 than did the naturally occurring E isomers. The decomposition rates of the Z isomers in mouse kidney homogenates were about 3-fold slower than those of the E isomers.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Harada S,Tsubotani S,Asai M,Okonogi K,Kondo Mdoi
10.1021/jm00359a600subject
Has Abstractpub_date
1983-05-01 00:00:00pages
753-7issue
5eissn
0022-2623issn
1520-4804journal_volume
26pub_type
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