[EN] PROCESS FOR THE PREPARATION OF RIFAXIMIN CRYSTALLINE FORM<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UNE FORME CRISTALLINE DE RIFAXIMINE
申请人:GRANULES INDIA LTD
公开号:WO2018178777A1
公开(公告)日:2018-10-04
The present invention relates to an improved process for the preparation Crystalline Form G2 of Rifaximin of Formula (I). The invention also relates to crystalline Form G2 of Rifaximin (I) obtained by the process of the present invention, the said Form G2 being substantially pure, stable and characterized by X-ray powder diffraction pattern comprising peaks selected from 5.3, 5.7, 6.4, 6.9, 7.1, 7.7, 8.7, 10.4, 10.5, 11.0, 1 1.5, 1 1.8, 17.2, 17.6, 18.2, 18.5 and 20.9 ± 0.2° 2θ. The invention also relates to crystalline Form Gl of Rifaximin (I) obtained by the process of the present invention, the said Form Gl being substantially pure, stable and characterized by X-ray powder diffraction pattern comprising peaks selected from 5.4, 6.6, 7.4, 7.9, 8.8, 10.5, 1 1.0, 1 1.8, 12.9, 17.6, 18.5, 19.7, 21.0, 21.4, 22.1 ± 0.2° 2θ.. The present invention further relates to process for the preparation of substantially pure Rifaximin comprising recrystallization in alcohol or in mixture of water and alcoholic solvents.
本发明涉及一种改进的方法,用于制备式(I)的Rifaximin晶体形式G2。该发明还涉及通过本发明的方法获得的晶体形式G2的Rifaximin(I),所述形式G2是基本纯净、稳定的,并具有由5.3、5.7、6.4、6.9、7.1、7.7、8.7、10.4、10.5、11.0、11.5、11.8、17.2、17.6、18.2、18.5和20.9 ± 0.2° 2θ选定的峰组成的X射线粉末衍射图案。该发明还涉及通过本发明的方法获得的晶体形式Gl的Rifaximin(I),所述形式Gl是基本纯净、稳定的,并具有由5.4、6.6、7.4、7.9、8.8、10.5、11.0、11.8、12.9、17.6、18.5、19.7、21.0、21.4、22.1 ± 0.2° 2θ选定的峰组成的X射线粉末衍射图案。本发明还涉及一种制备基本纯净Rifaximin的方法,包括在
酒精或
水和
酒精溶剂混合物中重结晶。