Methanesulfonic Acid → Eprosartan Mesylate

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As per the process described and exemplified in the U.S. Pat. No. 5,185,351 (herein after referred to as the '351 patent), eprosartan free base (obtained as per the processes described in example I of the '351 patent) is suspended in isopropyl alcohol under stirring at about 8° C., methanesulfonic acid is added rapidly to the stirred suspension, the mass cooled to 3° C. and the precipitated solid collected to give crude eprosartan mesylate. The crude eprosartan mesylate is further purified by dissolving crude eprosartan mesylate in acetic acid at 80° C., filtered through a hyflow bed at 80° C., the solution cooled slowly to 25° C. followed by stirring and then the precipitated solid is collected by adding ethyl acetate as an anti-solvent to give eprosartan mesylate.

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