Synthesis and Characterization of Impurities of a Common and Advanced Intermediate of Candesartan and Azilsartan Antihypertensive Drugs
Sangeeta Sangwan, Tapas Panda, Kaushal Nayyar, Sharwan K. Dewan, Rajesh K. Thaper
International Research Journal of Pure and Applied Chemistry · pp. 140–149 · Published 6 Nov 2014
10.9734/IRJPAC/2015/13162Abstract
Six impurities were identified in the lab development batches during the course of benzimidazole intermediate (1) synthesis by reverse phase HPLC method. Intermediate 1 is used as a common and advanced intermediate in the synthesis of candesartan and azilsartan. All the impurities were characterized by IR, NMR, LC/MS and CHN analyses, which included an isomer of intermediate 11 (impurity 19), desethyl analogue of 1 (impurity 20), desethoxy analogue of 1 (impurity 21), methyl analogue of 1 (impurity 22), cyanobiphenyl benzimidazole (impurity 25) and cyanobiphenyl derivative of 1 (impurity 26). The synthesis and characterization of these impurities are presented.
Cited by 2
N. V. D. Harikiran Maddi, Srinivas Garaga, Ambati V. Raghava Reddy · Current Issues in Pharmacy and Medical Sciences · 2017
Ana Testen, Miha Plevnik, Bogdan Štefane · Acta Pharmaceutica · 2018
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