Aluminum(III) Chloride → HCID 178481984, compound

Participants

Reaction Steps

To a solution of 7μ-[(Z)-2-(2-t-butoxycarbonylaminothiazol -4-yl)- 2-trityloxyiminoacetamido-3-(3-methyl-1,2,3-triazol-4-yl)thiomethylthio-3-cephem-4-carboxylic acid diphenylmethyl ester (900 mg: 0.869 mMol.) in a mixture of anisole (4 ml) and nitromethane (16 ml) is added a solution of aluminum chloride (924 mg: 6.95 mMol.) in anisole (2 ml) at -40° C., and the mixture is stirred for 1 hour at -40°-30° C. The reaction mixture is diluted with 1N-hydrochloric acid (7 ml) and water and washed with ethyl acetate. The aqueous layer is concentrated under reduced pressure to remove organic solvent and passed through a column of styrene-divinylbenzene copolymer adsorbent. The product is eluted with methanol-water (4:1) to give 7μ-(Z)-2-(2-aminothiazol -4-yl)-2-hydroxyiminoacetamido]-3-(3-methyl-1,2,3-triazol-4-yl)thiomethylthio-3-cephem-4-carboxylic acid as pale yellow powder (366 mg). Yield: 80%.

Provenance & Evidence