Water → HCID 54274141, compound

Participants

Reaction Steps

t-Butoxy-bis-dimethylaminomethane (1.9 cc) is added, whilst stirring, to a solution, at 80° C., under nitrogen, of the syn isomer of 2-benzhydryloxycarbonyl-7-{2-[(2-t-butoxycarbonylprop-2-yl)-oxyimino]-2-(2-tritylaminothiazol-4-yl)-acetamido}-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene (6 g) in dimethylformamide (64 cc), and the reaction is continued for 15 minutes. The mixture is then poured into a mixture of ethyl acetate (200 cc) and water (200 cc), the organic phase is decanted, washed with water (3×100 cc) and a saturated aqueous solution of sodium chloride (100 cc), dried over sodium sulphate and filtered and the filtrate is concentrated to dryness at 20° C. under 20 mm Hg (2.7 kPa). This yields crude 2-benzhydryloxycarbonyl-3-(2-dimethylaminovinyl)-7-{2-[(2-t-butoxycarbonylprop-2-yl)-oxyimino]-2-(2-tritylaminothiazol-4-yl)-acetamido}-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene, syn isomer, E form (6.5 g) in the form of a hard brown foam.

Provenance & Evidence