The present invention provides improved processes for preparing Bosentan. The present invention provides novel intermediates like 4,6-dihydroxy-5-(2-methoxy phenoxy)[2,2′]bipyrimidine of formula (II) and N-(6-Chloro-5-(2-ethoxyphenoxy)[2,2′-bipyrimidinyl]-4-t-butyl benzenesulfonamide cesium salt and process for preparation thereof. The invention also disclosed novel polymorphic form of the intermediates.
本发明提供了改进的Bosentan制备工艺。本发明提供了新型中间体,例如式(II)的
4,6-二羟基-5-(2-
甲氧基苯氧基)[2,2′]联
嘧啶和N-(6-
氯-5-(2-乙氧基苯氧基)[2,2′-联
嘧啶基]-4-
叔丁基苯磺酰胺
铯盐及其制备工艺。本发明还揭示了中间体的新型多晶形态。