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The synthesis and antibacterial activity of the 1-methylcarbapenems, 2-heteroaromatic-thiomethyl and 2-carbamoyloxymethyl derivatives having a 6-[(R)-1-hydroxyethyl] side chain, are described. The introduction of a methyl substituent at the C-1 position was accomplished by a newly developed procedure using crotyl halides and zinc dust. The 2-hydroxymethyl carbapenems as key intermediates allowed an easy entry into the preparation of title carbapenems.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Carbapenem and penem antibiotics. V. Carbapenem and penem antibiotics. VI. Synthesis and antibacterial activity of 2-heteroaromatic-thiomethyl and 2-carbamoyloxymethyl 1-methylcarbapenems.