申请人:TECHNOLOGITSCHEN KOMBINAT
SA PROMISCHLENA MIKROBIOLOGIA
公开号:EP0432297A1
公开(公告)日:1991-06-19
This invention refers to a method for the preparation of the broad spectrum antibiotic, sodium cefamandole naphthate.
The object is to provide a technological method warranting a high yield, high purity and stability of the product.
The method comprises the following stages:
silylation of the initial product 7-amino-3-(1-methyl-1H-tetrazol-5-yl-thiomethyl)-3-cephem-4-carboxylic acid, acylation and then desilylation. In the method of this invention the desilylation is accompanied by the removal of the solvent. The obtained product is further dissolved in ethylacetate, decolourized, the solvent is removed and the obtained oily product is dissolved in dry methylene chloride, crystallized, separated and dissolved in a non-aqueous medium of two organic solvents and precipitated as sodium salt with sodium acetate or sodium-2-ethylhexanoate.
本发明涉及一种制备广谱抗生素头孢孟多萘酸钠的方法。
其目的是提供一种技术方法,保证产品的高产率、高纯度和稳定性。
该方法包括以下几个阶段:
初始产物 7-氨基-3-(1-甲基-1H-四唑-5-基硫甲基)-3-头孢-4-羧酸的硅烷化、酰化,然后脱硅。在本发明的方法中,脱硅过程伴随着去除溶剂。得到的产物进一步溶解在乙酸乙酯中,脱溶剂,除去溶剂,得到的油状产物溶解在干二氯甲烷中,结晶,分离,溶解在两种有机溶剂的非水介质中,用乙酸钠或 2-乙基己酸钠沉淀为钠盐。