[EN] CRYSTALLINE FORM OF 2-(2-HYDROXY PHENYL)BENZ[E][1,3]OXAZIN-4-ONE, PROCESS FOR THE SAME AND USE FOR PRODUCING 4-(3,5-BIS(2-HYDROXYPHENYL)-1H-1,2,4-TRIAZOL-1-YL)BENZOIC ACID<br/>[FR] FORME CRISTALLINE DE LA 2-(2-HYDROXYPHÉNYL)BENZ[E][1,3]OXAZIN-4-ONE, SON PROCÉDÉ DE PRODUCTION ET SON UTILISATION POUR PRODUIRE L'ACIDE 4-(3,5-BIS(2-HYDROXYPHÉNYL)-1H-1,2,4-TRIAZOL-1-YL)BENZOÏQUE
申请人:MATRIX LAB LTD
公开号:WO2010023685A2
公开(公告)日:2010-03-04
The present invention relates to a crystalline form of 2-(2-hydroxyphenyl) benz [e] [1, 3] oxazin-4-one, a process for production thereof and its use in the preparation of 4- (3, 5-bis (2-hydroxyphenyl)-1H-1, 2, 4-triazol-1-yl) benzoic acid. The improved process for the preparation 4-(3,5-bis (2-hydroxyphenyl)-1H-1,2,4-triazol-1-yl) benzoic acid (Deferasirox), wherein salicylic chloride is reacted with salicylamide in presence of a solvent to give acyl compound, which is heated to higher temperature in-situ to undergo cyclization to obtain crystalline form of 2-(2-hydroxyphenyl) benz [e] [1, 3] oxazin-4-on and further reaction with hydrazino benzoic acid to give 4-(3,5- bis(2-hydroxyphenyl)-1H-1,2,4-triazol-1-yl)benzoic acid.