申请人:LUPIN LIMITED
公开号:US20040132996A1
公开(公告)日:2004-07-08
A process for preparation of ceftiofur sodium of formula (Ib)
1
possessing high stability and having purity of more than 97% and substantially free of impurities, is disclosed. The process comprises:
i) reacting cefotaxime or its salts or its esters of formula (VI)
2
wherein R
3
is hydrogen, an alkali or alkaline earth metal, or an easily hydrolysable ester, with thiofuroic acid, employed in a molar proportion of 1.5 to 3.0 moles per mole of compound (VI), in the presence of acetonitrile as solvent and in the presence of large excess of methanesulfonic acid, employed in molar proportions of 12 to 18 moles per mole of compound (VI), and at a temperature of between −5° C. to 30° C. to give after necessary neutralisation of the alkali or alkaline earth metal or removal of the ester group of the 4-carboxylic acid function, wherever applicable, ceftiofur of formula (Ia), possessing high stability and having purity of more than 97% and substantially free of impurities;
3
ii) converting the ceftiofur of formula (Ia) thus obtained to its salt with an organic amine by treating a solution of ceftiofur in a mixture of water and a water-miscible organic solvent with an organic amine, at a temperature ranging from −10° C. to 10° C.;
iii) reacting of the amine salt thus obtained with a sodium metal carrier in a mixture of water and water-miscible organic solvent and in presence of sodium hydrogen sulfite to give ceftiofur sodium of formula (Ib)
揭示了一种制备具有高稳定性、纯度超过97%且基本无杂质的化学式为(Ib)1的头孢噻呋钠的方法。该方法包括:i) 在丙腈作为溶剂和大量过量的甲磺酸存在下,将头孢噻唑或其盐或其酯的化学式为(VI)2,其中R3为氢、碱金属或碱土金属,或易水解酯,与噻呋酸反应,摩尔比为每摩尔化合物(VI)1.5至3.0摩尔,温度在-5°C至30°C之间,经过必要的中和碱金属或碱土金属或去除4-羧基酸功能的酯基(如适用),得到具有高稳定性、纯度超过97%且基本无杂质的化学式为(Ia)的头孢噻呋;ii) 将得到的化学式为(Ia)的头孢噻呋转化为其与有机胺的盐,通过在水和水相溶性有机溶剂的混合物中用有机胺处理头孢噻呋的溶液,在温度范围为-10°C至10°C;iii) 在水和水相溶性有机溶剂的混合物中,以及在硫代亚硫酸氢钠存在下,将得到的胺盐与钠金属载体反应,得到化学式为(Ib)的头孢噻呋钠。