Carbapenem and penem antibiotics. VII. Synthesis and antibacterial activity of 1.BETA.-methyl-2-(quaternary heteroaromatic-thiomethyl) carbapenems.

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Abstract
The synthesis and antibacterial activity of a series of 1β-methylcarbapenems having quaternary heteroaromatic-thiomethyl groups at the C-2 position are described. Both 2-hydroxymethyl and 2-chloromethyl carbapenems (1 and 7) respectively served as the common key intermediates for the preparation of these compounds. Of these, the 4-pyridiniothiomethyl derivatives exhibited the best antibacterial properties and turned out to possess high in vivo efficacy as well.

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