Synthesis of new penem derivatives: N-substituted analogs of FCE 22101

Synthese des hydroxy-1' ethyl-6 penemecarboxylates-3 de sodium substitues en 2 par methyl-, cyclohexyl- ou phenylcarbamoyloxymethyl via la carbamoylation en presence de dimethylamino-4 pyridine du t-butyldimethylsiloxy-1' ethyl-6 hydroxymethyl-2 penemecarboxylate-3 d'allyle