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US 3,943,126 AGranted
Process for acylating a 7-aminocephalosporin
AssigneeEli Lilly and Company
InventorsCharles W. Ryan, William B. Blanchard
Life of this patent
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Abstract
A 7-aminocephalosporin is acylated to a 7-acylamidocephalosporin by reaction with the pentachlorophenyl ester of sydnone-3-acetic acid or 1-tetrazoleacetic acid.
Claims11
A process for acylating a 7-aminocephalosporin which comprises the step of reacting said 7-aminocephalosporin or a silylated derivative thereof with a pentachlorophenyl ester of the formula ##SPC3##
- in which R.sub.2 is sydnone-3-acetyl or 1-tetrazoleacetyl.
Dependencies are inferred from the claim text.