METHOD OF PREPARING A HIGHLY PURE POTASSIUM SALT OF AZILSARTAN MEDOXOMIL

摘要

A method of preparing the potassium salt of azilsartan medoxomil of formula I, in which a solvate of azilsartan medoxomil of formula II with a solvent selected from the group that consists of dimethyl acetamide or N-methyl pyrrolidone or their mixtures with other solvents is prepared, or re-crystallized from dimethyl acetamide or N-methyl pyrrolidine or their mixtures with other solvents, and, in the next step, converted to the potassium salt using a potassium source in a suitable solvent.