Azami H, Barrett D, Matsuda K, Tsutsumi H, Washizuka K, Sakurai M, Kuroda S, Shirai F, Chiba T, Kamimura T, Murata M. Synthesis and antibacterial activity of novel 4-pyrrolidinylthio carbapenems. Part III: Novel 2-alkyl substituents containing cationic heteroaromatics linked via a C-N bond.
Bioorg Med Chem 1999;
7:1665-82. [PMID:
10482459 DOI:
10.1016/s0968-0896(99)00085-1]
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Abstract
The synthesis and biological activity of a novel series of 2-alkyl-4-pyrrolidinylthio-beta-methylcarbapenems containing a variety of cationic heteroaromatic substituents is described. As a result of these studies, we uncovered a relationship between in vitro antibacterial activity and the length of the alkyl spacer part, and discovered FR20950 (1c), containing a two methylene spacer moiety and an imidazolio group, which possesses a balanced spectrum of antibacterial activity, including Pseudomonas aeruginosa and Methicillin-resistant Staphylococcus aureus (MRSA). Furthermore, FR20950 exhibited excellent urinary recovery, and comparable stability against renal dehydropeptidase-I (DHP-I) to Biapenem. DHP-I stability could be improved by introduction of a substituent on to the imidazole ring.
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