Structure--activity relationships of 1beta-methyl-2-(5-phenylpyrrolidin-3-ylthio)carbapenems.

Hiroki Sato, Hiroki Sakoh, Takashi Hashihayata, Hideaki Imamura, Norikazu Ohtake, Aya Shimizu, Yuichi Sugimoto, Shunji Sakuraba, Rie Bamba-Nagano, Koji Yamada, Terutaka Hashizume, Hajime Morishima

Index: Bioorg. Med. Chem. 10 , 1595, (2002)

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Abstract

Structure--activity relationship studies of 1beta-methyl-2-[(3S,5R)-5-(4-aminomethylphenyl)pyrrolidin-3-ylthio]carbapenems, especially those pertaining to the relationship between antibacterial activity and side-chain structure were conducted. These studies suggested that the trans-(3S,5R)-5-phenylpyrrolidin-3-ylthio side-chain and the aminomethyl group at the 4-position of the phenyl ring play a key role in enhancing the antibacterial activity against the MRSA and Pseudomonas aeruginosa strains. In particular, the basicity of a substituent at the 4-position of the phenyl ring were shown to greatly contribute to the antibacterial activity against MRSA and methicillin-resistant Staphyloccocus epidermidis strains. In contrast, the amidine group was shown to lead to potent antibacterial activity against P. aeruginosa strains comparable to that of imipenem, however, a good correlation between the basicity of the 4-substituent and antipseudomonal activity was not observed. In conclusion, the 4-aminomethyl or methylaminomethyl group on the phenyl ring was the best substituent for antipseudomonal activity.