New Straightforward Synthesis and Characterization of a Unique 1β-Methylcarbapenem Antibiotic Biapenem Bearing a σ-Symmetric Bicyclotriazoliumthio Group as the Pendant Moiety
摘要:
Biapenem 1, (1R,5S,6S,)-2-[(6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazolium-6-yl)thio]-6-[(R)-1-hydroxyethyl]-1-methylcarbapen-2-em-3-carboxylate, is a new non-natural 1 beta-methylcarbapenem antibiotic which exhibits a wide range of antibacterial activity, remarkable chemical stability, and extensive stability against human renal dehydropeptidase-I. Mercaptobicyclotriazolium chloride 2 useful for the pendant moiety of 1 was successfully synthesized starting from hydrazine hydrate 3 along an economically available synthetic route. The thiol 2 was efficiently exploited for an expeditious synthesis of biapenem 1. Characterization (crystal structure, nonbonded S---O interaction, conformational analysis, and CH- - -O hydrogen bonds) of 1 was investigated by its X-ray crystallographic, H-1 NMR, and deuteration experiment analyses.
New Straightforward Synthesis and Characterization of a Unique 1β-Methylcarbapenem Antibiotic Biapenem Bearing a σ-Symmetric Bicyclotriazoliumthio Group as the Pendant Moiety
摘要:
Biapenem 1, (1R,5S,6S,)-2-[(6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazolium-6-yl)thio]-6-[(R)-1-hydroxyethyl]-1-methylcarbapen-2-em-3-carboxylate, is a new non-natural 1 beta-methylcarbapenem antibiotic which exhibits a wide range of antibacterial activity, remarkable chemical stability, and extensive stability against human renal dehydropeptidase-I. Mercaptobicyclotriazolium chloride 2 useful for the pendant moiety of 1 was successfully synthesized starting from hydrazine hydrate 3 along an economically available synthetic route. The thiol 2 was efficiently exploited for an expeditious synthesis of biapenem 1. Characterization (crystal structure, nonbonded S---O interaction, conformational analysis, and CH- - -O hydrogen bonds) of 1 was investigated by its X-ray crystallographic, H-1 NMR, and deuteration experiment analyses.
Process for preparing 1,2-pyrazolidine-4-yl-disulfide compound
申请人:WAKO PURE CHEMICAL INDUSTRIES LTD
公开号:EP0641783A1
公开(公告)日:1995-03-08
Novel and improved simple process for preparing a 1,2-pyrazolidine-4-yl-disulfide compound represented by the following formula:
wherein R¹ and R² are, independently each other, a hydrogen atom or an amino-protecting group.
This compound may be prepared by reacting a compound of the formula:
wherein R³ is an acid anion residue group, and
R¹ and R² have the same meanings as above, with a disulfide compound selected from the group consisting of an alkali metal disulfide, an alkali earth metal disulfide, an ammonium disulfide and a tri-alkylammonium disulfide.