Synthesis of new tricyclic carbapenems (trinems) with a pyrrolidinyl moiety
at the C-4 position of the tricyclic ring and their antimicrobial activiti
es were studied. These trinems showed potent activities against Gram-positi
ve bacteria including methicillin-resistant Staphylococcus aureus (MRSA). A
mong them, (4R)-[(S)-pyrrolidin-3-ylthiomethyl]trinem (14a) exhibited good
activity against MRSA in vitro and in vivo.