The present invention provides an improved synthesis for the manufacture of candesartan and pharmaceutically acceptable salts and esters thereof as active ingredients of a medicament for {HEAD ~ the treatment} of hypertension and related diseases and conditions which comprises {TAIL ~ the removal} of the tetrazolyl protecting group in an organic solvent, and in the presence of a Lewis acid 
comprises
The present invention provides an improved synthesis for the manufacture of candesartan and pharmaceutically acceptable salts and esters thereof as active ingredients of a medicament for { HEAD ~ the treatment } of hypertension and related diseases and conditions which comprises { TAIL ~ the removal } of the tetrazolyl protecting group in an organic solvent , and in the presence of a Lewis acid
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