Citric Acid → HCID 178441785, compound

Participants

Reaction Steps

A mixture of 2-butyl-5-cyano-4-(1H-pyrrol-1-yl)-1-[(2'-(1H-tetrazol-5-yl)biphen-4-yl)methyl]-1H-imidazole (Example 15, 1.4 g) and 2 N NaOH (75 mL) was heated at reflux for 24 hours. The cooled solution was acidified to pH 3.5 by portionwise addition of citric acid. The resulting precipitate was collected by filtration and rinsed well with water. The solid was then purified by C18 -reversed phase chromatography eluting with acetonitrile-water (40:60). The majority of the acetonitrile was evaporated from the pure fractions at reduced pressure, keeping the temperature below 30° C. The remaining aqueous portion was washed with ethyl acetate and the organic layer was dried over anhydrous magnesium sulfate and evaporated. The residue was dissolved in ether and evaporated once again to give the title compound as a colorless powder. MS (FAB, thioglycerol) 468 (m+1), 424 (m-CO2 +1).

Provenance & Evidence