Aluminum(III) Chloride → HCID 178482024, compound

Participants

Reaction Steps

To a solution of 7β-[(Z)-2-(2-t-butoxycarbonylaminothiazol-4-yl)-2-trityloxyiminoacetyl]amino-3-(1-methyl-5-tetrazolyl)thiomethylthio-3-cephem-4-carboxylic acid diphenylmethyl ester (576 mg: 0.555 mMol.) in a mixture of anisole (2 ml) and nitromethane (8 ml) cooling at -30° to -40° C. is added a solution of aluminum chloride (591 mg: 4.44 mMol.) in anisole (2 ml), and the mixture is stirred at -30° to -40° C. for 1 hour. The reaction mixture is diluted with 1N-hydrochloric acid (5 ml) and water and washed with ethyl acetate. The aqueous layer is concentrated under reduced pressure to remove the organic solvents, and purified by styrene-divinylbenzene copolymer chromatography (methanol: water=4:1). The resulting powder is washed with ethyl acetate to give 7β-[(Z)-2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetyl]amino-3-(1-methyl-5-tetrazolyl)thiomethylthio-3-cephem-4-carboxylic acid as yellow powder (200 mg). Yield: 68%.

Provenance & Evidence