One object of the invention is high purity butoconazole nitrate of the formula (I) (chemical name: 1-[4-(4-chlorophenyl)-2-(2,6-dichlorophenylthio)-n-butyl]-imidazole nitrate) containing maximum 0.1 wt % of chemical impurities, wherein at last 95 % of the particles of the substance are below 75 µm by diameter, whereas at least 99 % of the particles are below 250 µm by diameter. Another object of the invention is a process for the preparation of butoconazole nitrate starting from 1-chloro-4-chlorophenyl-2-butanol and imidazole to yield a compound of the formula (IV), reacting said compound of formula (IV) with thionyl chloride to give a compound of the formula (V) and reacting the obtained compound of the formula (V) with 2,6-dichlorothiophenol, performing said reaction steps in such a manner that the first step is carried out in a mixture of a water immiscible solvent and an aqueous solution of an alkali metal hydroxide or carbonate in the presence a phase transfer catalyst; the second step is accomplished in 1,2-dichloroethane solvent in the presence of dimethylformamide, whereas 1-1.2 mol of thionyl chloride reactant is used based on the amount of the compound of the formula (IV); and the third steps is performed without isolation of the product (VI) from the solution obtained, but to said solution nitric acid is added to give the butoconazole nitrate salt.
Still another object of the invention is a process for the preparation of the compound with the above specified particle size starting from crude butoconazole nitrate in such a manner that the starting material is dissolved in a mixture of methanol and methyl isobutyl ketone of 1 - 1.5 : 1 ratio (v/v), this solution is then added to methyl isobutyl ketone cooled to a temperature between 5 °C and -15 °C and the product obtained is isolated.
A pharmaceutical composition comprising as active ingredient high purity butoconazole nitrate of specified particle size in admixture with known auxiliaries is also within the scope of the invention.
本发明的一个目的是式(I)的高纯度
硝酸丁康唑(
化学名称:1-[4-(4-
氯苯基)-2-(2,6-二
氯苯硫基)-正丁基]-
咪唑硝酸盐),其
化学杂质含量不超过0.1重量%,其中至少95%的物质颗粒直径低于75微米,而至少99%的颗粒直径低于250微米。本发明的另一个目的是制备
硝酸丁康唑的工艺,从 1-
氯-4-
氯苯基-
2-丁醇和
咪唑开始,得到式 (IV) 化合物,将所述式 (IV) 化合物与亚
硫酰氯反应,得到式 (V) 化合物,将得到的式 (V) 化合物与 2、6-二
氯苯硫酚反应,第一步在不溶于
水的溶剂和碱
金属氢氧化物或
碳酸盐
水溶液的混合物中,在相转移催化剂存在下进行;第二步在有二甲基甲酰胺存在的 1,2-
二氯乙烷溶剂中完成,而 1-1.2摩尔的亚
硫酰氯反应物;第三步不从所得溶液中分离产物(VI),但在所述溶液中加入
硝酸,得到
硝酸丁康唑盐。
本发明的另一个目的是以
硝酸丁康唑粗盐为起始原料制备具有上述粒度的化合物的工艺,其方法是将起始原料溶解在
甲醇和
甲基异丁基酮的混合物中,其比例为 1 - 1.5 : 1 (v/v),然后将该溶液加入
甲基异丁基酮中,冷却至 5 °C 至 -15 °C 之间,分离得到产物。
一种药物组合物也属于本发明的范围,该药物组合物包括作为活性成分的高纯度
硝酸丁康唑和已知的助剂,其粒径为规定的粒度。