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Isolation, synthesis and characterization of impurities in celecoxib, a COX-2 inhibitor.
Satyanarayana U, Rao DS, Kumar YR, Babu JM, Kumar PR, Reddy JT. Satyanarayana U, et al. J Pharm Biomed Anal. 2004 Jun 29;35(4):951-7. doi: 10.1016/j.jpba.2004.02.037. J Pharm Biomed Anal. 2004. PMID: 15193741
The structure of impurities III, IV (ortho-isomer) and V (regio-isomer) were confirmed as [5-(4-methylphenyl)-3-trifluoromethyl-1H-pyrazole], 4-[5-(2'-methyl phenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl] benzene …
The structure of impurities III, IV (ortho-isomer) and V (regio-isomer) were confirmed as [5-(4-methylphenyl)-3- …
Liquid-chromatographic separation and determination of process-related impurities, including a regio-specific isomer of celecoxib on reversed-phase C18 column dynamically coated with hexamethyldisilazane.
Rao RN, Meena S, Nagaraju D, Rao AR, Ravikanth S. Rao RN, et al. Anal Sci. 2006 Sep;22(9):1257-60. doi: 10.2116/analsci.22.1257. Anal Sci. 2006. PMID: 16966821 Free article.
The separation of impurities viz., 4-methylacetophenone (I), 1-(4-methylphenyl)-4,4,4-trifluorobutane-1,3-dione (II), 4-hydrazinobenzene sulfonamide (III) and a regio-specific isomer [3-(4-methylphenyl)-5-trifluoromethyl- …
The separation of impurities viz., 4-methylacetophenone (I), 1-(4-methylphenyl)-4,4,4-trifluorobutane-1,3-dione (II), 4 …