Diisopropyl Ether → Hexanoyloxymethyl 7-[2-(2-aminothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate

Participants

Reaction Steps

To a solution of sodium 7-[2-(2-aminothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (2 g) in N,N-dimethylformamide (20 ml) was added a solution of iodomethyl hexanoate (1.28 g) in N,N-dimethylformamide (4 ml) under ice-cooling, and the mixture was stirred at the same temperature for 15 minutes. To the reaction mixture was added ethyl acetate (80 ml), followed by washing twice with water, three times with 5% aqueous solution of sodium bicarbonate and twice with a saturated aqueous solution of sodium chloride. The resultant solution was dried over anhydrous magnesium sulfate and then evaporated to give a residue, which was pulverized with diisopropyl ether to obtain hexanoyloxymethyl 7-[2-(2-aminothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (1.85 g), mp 98°-109° C. (dec.).

Provenance & Evidence