New azetidinones substituted in position 4 as precursors type antibiotics 3-carboxy-carbapenems substituted in position 2, and a method for producing them.

摘要

4-AZETIDINOMAS REPLACED NEW having formulas * FIG *: CON R1, R2, R3, R4, R5 YX defined below, which are intermediates for the preparation of antibacterial carbapenem AND carbacephem AND PROCESS FOR PRODUCING SUCH ANTIBACTERIAL A THROUGH THE USE OF MEDIATED cyclization reaction ACIDA.