Hydrochloric Acid → 4-[6-(Cyclopentyloxycarbonyl)aminobenzimidazol-1-ylmethyl]-3-methoxybenzoic acid

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Reaction Steps

A stirred solution of methyl 4-[6-(cyclopentyloxycarbonyl)aminobenzimidazol-1-ylmethyl]-3methoxybenzoate in 1:1 v/v tetrahydrofuran:methanol (7 ml.) was treated with water (1.4 ml.) and lithium hydroxide monohydrate (0.3 g.). Stirring was continued at ambient temperature for 4 hours. The solvent was then evaporated. The resultant residue was dissolved in water. The solution obtained was acidified with 10% v/v hydrochloric acid. The resultant precipitate was collected by filtration to give the title compound (0.43 g., 78%). An analytical sample was obtained as a white powder by recrystallization from aqueous ethanol; m.p. 241°-242° C.

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