申请人:Mathad Vijayavitthal Thippannachar
公开号:US20130296560A1
公开(公告)日:2013-11-07
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.
已经披露了一种公式(VIII)的波生坦铵盐。该盐可以是结晶的、非晶的或结晶和非晶的混合物。还披露了一种新型单锅法制备波生坦铵盐的过程。该过程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'-联吡嗪与4-叔丁基苯磺酰胺反应;向反应物中加入乙二醇并分离出波生坦铵盐。波生坦铵盐被转化为波生坦,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。