An objective of the present invention is to provide carbapenem derivatives which have potent antibiotic activity against MRSA, PRSP, Influenzavirus, and &bgr;-lactamase-producing bacteria and are stable against DHP-1. The compounds according to the present invention are compounds represented by formula (I) or pharmaceutically acceptable salts thereof:
1
wherein R
1
represents H or methyl; R
2
and R
3
represent H, a halogen atom, alkyl or the like; and R
4
represents substituted lower alkylthio or the like.
An objective of the present invention is to provide carbapenem derivatives which have potent antibiotic activity against MRSA, PRSP, Influenzavirus, and β-lactamase-producing bacteria and are stable against DHP-1. The compounds according to the present invention are compounds represented by formula (I) or pharmaceutically acceptable salts thereof:
wherein R1 represents H or methyl; R2 and R3 represent H, a halogen atom, alkyl or the like; and R4 represents substituted lower alkylthio or the like.
A novel synthetic method using an original and practical procedure for the preparation of the N-PNZ protected 2-aminomethylpyrrolidin-4-ylthio-containing sidechain of doripenem hydrate (S-4661), a new parenteral 1β-methylcarbapenem antibiotic, is described. trans-4-Hydroxy-l-proline was converted through an efficient process to (2S,4S)-4-acetylthio-2-(N-sulfamoyl-4-nitro-benzyloxycarbonyl-aminome