Hydrochloric Acid → (5R,6S)-3-(1-acetimidoylpyrrolidin-3-yl)-6-[(1R)-1-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A solution of (5R,6S)-6-[(1R)-1-hydroxyethyl]-7-oxo-3-(pyrrolidin-3-yl)-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (180 mg) in phosphate buffer solution (pH was adjusted to around pH 8.5 with 30% aqueous potassium carbonate at 0° C. To the solution was added four portions of ethyl acetimidate hydrochloride (835 mg), while adjusting pH to around 8.5 with j0% aqueous potassium carbonate. After stirring for 10 minutes at 0° C., the solution was adjusted to around pH 7.0 with 1N hydrochloric acid. After the mixture was washed with a mixture of ethyl acetate (270 ml) and tetrahydrofuran (30 ml), the aqueous layer was concentrated. The resulting solution was chromatographed on nonionic adsorption resin "Diaion HP-20" (40 ml) eluting with a mixture of acetonitrile and water (2:98, V/V). The fractions containing the object compound were collected and freeze-dried to give (5R,6S)-3-(1-acetimidoylpyrrolidin-3-yl)-6-[(1R)-1-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (80 mg).

Provenance & Evidence