Acetic Acid → Ceftizoxime

Beteiligte Stoffe

Reaktionsschritte

A solution of 5.40 mmol of ceftizoxime sodium salt (equivalent to 2 g of ceftizoxime) in 20 ml of water was acidified with 5.40 ml of 1 N acetic acid. The resulting solid was collected and washed with ice water to give 1.90 g of ceftizoxime. A suspension of 1.85 g of ceftizoxime (dried at 80° C./0.1 mm) in 60 ml of methylene chloride was stirred overnight under argon with 2.03 g of N,O-bis(trimethylsilyl) acetamide and 1.73 g of diethyl chlorophosphate, whereupon the solid had dissolved. After a month the reaction mixture was evaporated to dryness and the residue was washed with water. The aqueous washes were extracted with chloroform, back-washing the chloroform extracts with water. Evaporation of the dried (MgSO4) chloroform extracts left 0.049 g of a colorless gum; NMR (CDCl3, 80 MHz) δ 1.37 (t, CH3) δ 1.41 (t, CH3), 4.17 (OCH2, NOCH3); IR (KBr) 1032 (P= O), 1787 (β-lactam).

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