A process for the preparation of Cefuroxime acid (1), which comprises the following steps: (1) Extraction of deacetyl 7-glutaryl ACA (II) aqueous solution at acid pH with organic solvents (for example according to the procedures disclosed in U.S. Pat. No. 5,801,241); (2) drying the resulting solution while preventing lactonization of the intermediate; (3) carbamoylation of the hydroxymethyl group at the 3-position by reaction with chlorosulfonyl isocyanate or similar products; (7) extraction of the carbamoyl derivative from step 3 with water at neutral pH; (8) enzymatic hydrolysis of the amide at the 7-position of the cephalosporanic ring with glutaryl acylase; (6) acylation of the amino group by condensation with 2-furanyl(sin-methoxyimino)acetic acid chloride or mixed anhydride.
一种制备
头孢呋辛酸(1)的工艺,包括以下步骤:(1) 在酸性 pH 下用有机溶剂(例如按照 U.S. Pat.No.5,801,241);(2) 干燥所得溶液,同时防止中间体内酯化;(3) 通过与
氯磺酰异氰酸酯或类似产物反应,将 3 位上的羟甲基
氨基甲酰化;(7) 在中性 pH 下用
水萃取步骤 3 中的
氨基甲酰基衍
生物;(8) 用戊二酰酰化酶酶解头孢环 7 位上的酰胺; (6) 通过与 2-
呋喃基(sin-甲氧基亚
氨基)
乙酸氯化物或混合酸酐缩合使
氨基酰化。