Pyridine → HCID 131713913, compound

Participants

Reaction Steps

Dicyclohexylcarbodiimide (6.5 g) was added to a stirred solution of 7-[2-(2-formamidothiazol-4-yl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylic acid (syn isomer, 8.6 g) and 2-n-nonanoyloxy-1-n-nonanoyloxymethylethanol (7.8 g) in a mixture of dry pyridine (80 ml) and dry tetrahydrofuran (25 ml) at 3° C., and then stirred at 0° to 5° C. for 4 hours and allowed to stand at room temperature overnight. The resultant mixture was poured into ice water (450 ml) and extracted with ethyl acetate (450 ml). Water (50 ml) was added to the extract and adjusted to pH 2 to 3 with 20% sulfuric acid. The organic layer was separated, washed with a saturated aqueous solution of sodium chloride (100 ml×2) and an aqueous solution of sodium bicarbonate in turn, and dried over anhydrous magnesium sulfate. After removing the solution in vacuo, the residue was subjected to column chromatography on silica gel (370 g) with a mixture of chloroform and acetone (5:1). The eluate was evaporated in vacuo to give powder (4.62 g) of 2-n-nonanoyloxy-1-n-nonanoyloxymethylethyl 7-[2-(2-formamidothiazol-4-yl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate (syn isomer).

Provenance & Evidence