Dicyclohexylcarbodiimide → 7-(2,2,2-Trifluoroethylsulfonylacetamido)-3-[1-(2-ureidoethyl)-tetrazol-5-ylthiomethyl]-3-cephem-4-carboxylic acid t-butyl ester

Participants

Reaction Steps

To a solution of 8.6 g. (0.019 mol.) of 7-amino-3-[1-(2-ureidoethyl)tetrazol-5-ylthiomethyl]-3-cephem-4-carboxyic acid t-butyl ester and 3.9 g. (0.019 mol.) of 2,2,2-trifluoroethylsulfonylacetic acid in tetrahydrofuran is added dropwise a solution of 3.9 g. (0.019 mol.) of dicyclohexylcarbodiimide in 100 ml. of tetrahydrofuran. The reaction mixture is stirred at 25° for 12 hours, then filtered and concentrated to about 10 ml. The residue is filtered and evaporated to dryness to give 7-(2,2,2-trifluoroethylsulfonylacetamido)-3-[1-(2-ureidoethyl)-tetrazol-5-ylthiomethyl]-3-cephem-4-carboxylic acid t-butyl ester.

Provenance & Evidence