Patent ID: 7563814

Claim:
A process for preparing olmesartan medoxomil containing less than about 0.1% of one or more of comprising: a) obtaining a sample of trityl olmesartan medoxomil; b) measuring the amount of one or more impurities selected from the group consisting of in the sample of trityl olmesartan medoxomil; c) selecting a sample of trityl olmesartan medoxomil in which the amount of one or more of the measured impurities is less than about 0.1%; d) combining the trityl olmesartan medoxomil from step c) with an acid in a solvent to produce triphenyl carbinol; e) preparing a filtrate comprising olmesartan medoxomil by precipitating and filtering out the triphenyl carbinol; f) adding a base to the filtrate; and g) cooling the filtrate of step f) to obtain olmesartan medoxomil.