New functionalized monocyclic beta-lactams suitable precursors for anhydro 2-azacephams
摘要:
The anhydro 2-azacephams 9 were prepared starting from penicillanate sulphoxides 1 via 4-aminosulphinyl-2-oxoazetidines 3 and 4 and 4-aminosulphonyl-2-oxoazetidines 6 and 8. New functionalized monocyclic beta-lactams 5 and 7 were also produced as precursors for other beta-lactam species.
Penicillin sulfoxide derived azetidinone sulfinyl chlorides and related sulfinic acid derivatives are cyclized to 3-methylenecephams by reaction with Friedel-Crafts catalysts or metathetic cation forming agents.
Process for the conversion of penicillin S-oxide into a corresponding
申请人:Societe Anonyme dite: CLIN-MIDY
公开号:US03959266A1
公开(公告)日:1976-05-25
A penicillin S-oxide is rearranged into the corresponding desacetoxycephalosporin compound by heating said penicillin S-oxide at a temperature of from 70 to 140.degree.C in the presence of a sulfoxide of formula R.sup.1 -SO-R.sup.2, preferably dimethyl sulfoxide, or a sulfonium or sulfoxonium salt of said sulfoxyde or a mixture of said sulfoxide and said sulfonium or sulfoxonium salt. The sulfoxide may act as reaction medium as well as reactant or an inert organic solvent may be used as a reaction medium.
Azetidinone antibiotics. XII. Chemical transformations of penicillins and cephalosporins. Mechanism and stereochemistry of the interconversions of penam and cepham systems
作者:S. Kukolja、S. R. Lammert、M. R. Gleissner、A. I. Ellis