PROCESS FOR PREPARATION OF BOSENTAN

摘要

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.