Water → diphenylmethyl (6R,7R)-3-[(methylsulfonyl)oxy]-8-oxo-7-[(phenylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

Benzhydryl 7β-[(phenylacetyl)amino]-3-hydroxy-3-cephem-4-carboxylate (500 g, 1 mol) was dissolved in acetone (2 L) and methanesulfonyl chloride (86 mL, 1.1 mol) was added dropwise over 10 min with stirring at −20° C. Then, ethyldiisopropylamine (183 mL, 1.05 mol) was added dropwise over 30 min and the mixture was stirred at −20° C. for 40 min. The reaction mixture was poured into iced water (8 L) and the precipitate was collected by filtration. The precipitate was then washed with water (2 L) and ethyl acetate (300 mL), and dried under reduced pressure to give the title compound (523 g, 0.90 mol). yield: 90%.

Provenance & Evidence