Deacetoxycephalosporins via penicillin sulfoxide rearrangement

Details Deacetoxycephalosporins via penicillin sulfoxide rearrangement Deacetoxycephalosporins via penicillin sulfoxide rearrangement

C - Chemistry, Metallurgy

07

D

260/103

C07D 501/10 (2006.01) C07F 9/58 (2006.01)

Patent

CA 1053225

ABSTRACT The invention relates to a process for preparing a 7-acylamido-3-methyl-3-cephem-4-carboxylic acid ester by healing a 6-acylamidopenicillanic acid sulfoxide ester in an inert solvent and in the presence of an acidic catalyst characterized in that the improvement comprises heating the penicillin sulfoxide ester in 1,1,2-trichloroethane and in the presence of a salt of dichloromethanephosphonic acid and pyridine, quinoline, isoquinoline or the methyl substituted derivatives thereof.

241008

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