An Efficient, Commercially Viable, and Safe Process for Preparation of Losartan Potassium, an Angiotensin II Receptor Antagonist

An efficient, commercially viable and safe process for the preparation of losartan potassium, an antihypertensive drug substance, with an overall yield of 55.5% and ∼99.9% purity (including five chemical reactions and two recrystallizations) and meeting all other regulatory requirements is described. Formation and control of all the possible impurities are also described.