Water → (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl (6R)-7-[[(2Z)-2-methoxyimino-2-(1,3-thiazol-4-yl)acetyl]amino]-3-[(3-methyl-1,2,4-thiadiazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

Participants

Reaction Steps

4-Bromomethyl-5-methyl-1,3-dioxolene-2-one (386 mg) was added to a solution of sodium 7-[(Z)-2-methoxyimino-2-(thiazol-4-yl)acetamido]-3-(3-methyl-1,2,4-thiadiazol-5-yl)thiomethyl-3-cephem-4-carboxylate (536 mg) in dimethylformamide (5 ml) at -5° C. The mixture was stirred at this temperature for 1.3 hr and then poured into a mixture of ethyl acetate (130 ml) and water (30 ml, adjusted to pH 3 with dil HCl) with stirring. The ethyl acetate layer was separated, washed successively with water (30 ml, adjusted to pH 3 with dil. HCl), 10% aqueous K2HPO4 solution (30 ml) twice, and saturated saline water, dried over MgSO4, concentrated in vacuo, and the residue was added dropwise to a mixture of diethyl ether (40 ml) and petroleum ether (40 ml). The formed crystals were filtered, washed with petroleum ether, and dried in vacuo to give the title compound (390 mg). ##STR38##

Provenance & Evidence