A novel ammonium salt of Bosentan of formula (VIII); has been disclosed. The salt may be either crystalline or amorphous or mixture of Crystalline and amorphous form. A novel single pot process for the preparations of ammonium salt of Bosentan has been disclosed. The process comprises reacting the 4,6-dichloro-5-(2-methoxyphenoxy)-2,2'- bipyrimidine with 4-tert-butylbenzenesulfonamide in the presence of solvent and a base; adding ethylene glycol to the reaction mass and isolating the ammonium salt of Bosentan. The ammonium salt of Bosentan is converted into Bosentan and further into Bosentan Monohydrate which are substantially free from dimer impurity and 6-hydroxy impurity.
已经披露了一种
化学式为(VIII)的
波生坦铵盐。该盐可以是结晶的、非晶的或结晶和非晶形式的混合物。已经披露了一种用于制备
波生坦铵盐的新型一锅法工艺。该工艺包括在溶剂和碱的存在下,将4,6-二
氯-5-(2-
甲氧基苯氧基)-
2,2'-联吡啶与4-
叔丁基苯磺酰胺反应;向反应体系中加入
乙二醇并分离出
波生坦铵盐。
波生坦铵盐转化为
波生坦,进一步转化为
波生坦单
水合物,这些物质基本上不含二聚体杂质和6-羟基杂质。