A process for the preparation of cephalosporin antibiotic of the formula (I)
which comprises:
(i) activating the compound of formula (III) as acid halide in an organic solvent
(ii) treating the reaction mass obtained from step (i) with water (iii) separating the organic layer containing the reactive derivative of formula (III) and condensing it with 7-amino cephalosporin derivative by maintaining the pH in the range 5.0-10.0 using an inorganic base of the formula (XV), and
iv) cyclizing the compound of formula (XVI)
with thiourea in the presence of solvent and salt of organic or inorganic acid at a temperature in the range of −50 to +50° C. to produce compound of formula (I).
一种制备
头孢菌素抗生素(I)的方法,包括:(i)在有机溶剂中激活公式(III)的化合物为酸卤化物;(ii)用
水处理步骤(i)得到的反应混合物;(iii)分离含有公式(III)反应衍
生物的有机层,并在pH在5.0-10.0范围内使用
无机碱(XV)与7-
氨基
头孢菌素衍
生物进行缩合;(iv)在有机或
无机酸盐溶剂和盐的存在下,将公式(XVI)的化合物在-50到+50°C的温度范围内与
硫脲环化,得到公式(I)的化合物。