sodium (6R,7R)-7-[[(2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetyl]amino]-3-(hydroxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate → (6R,7R)-3-[[5-(2-amino-2-iminoethyl)sulfanyl-1,3,4-thiadiazol-2-yl]sulfanylmethyl]-7-[[(2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 371 mg of sodium 7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-(Z)-2-methoxyiminoacetamido]-3-hydroxymethyl-3-cephem-4-carboxylate and 309 mg of 2-amidinomethylthio-5-mercapto-1,3,4-thiadiazole in 10 ml of DMF was added 600 mg of ethyl o-phenylenephosphate under stirring at -20° C. After stirring at -20° C. to 0° C. for 60 minutes, the mixture was subjected to a column chromatography on silica gel (100 g), being washed with acetonitrile and eluted with acetonitrile/water (4:1). The eluate was concentrated under reduced pressure, and the resultant solid was dissolved in dilute hydrochloric acid. This aqueous solution was subjected to a column chromatography on XAD-II (150 ml), being washed with water and eluted with 30% aqueous ethanol. The eluate was concentrated under reduced pressure and lyophilized to give 381 mg of the title compound as a colorless powder.

Provenance & Evidence