Losartan → Losartan potassium salt

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To 10.2 g losartan of Example 1 in 59 ml i-propanol, a solution of 1.4 g of potassium hydroxide in 1.5 ml of water was added at a temperature of 38-40° C. to a pH of 10 during half an hour. Approximately 19 ml of azeotropic mixture i-propanol/water were removed by distillation, 36 ml n-heptane were added, and reaction mixture was stirred at room temperature until a white solid was formed. The resulting solid was diluted with 14 ml n-heptane, filtered, washed with 26 ml n-heptane, and dried in vacuo at 50° C. to yield 8.57 g losartan potassium.

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