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