Abstract
2-Methylindole-3-acetic acid and its 5-methoxy derivative were prepared from the respective phenylhydrazines and levulinic acid. Indole-3-carboxylic acid was obtained from indole, dimethylformamide and trifluoroacetic acid. These indole carboxylic acids were then condensed with substituted o-phenylenediamines under high temperature conditions in the presence of polyphosphoric acid as a catalyst to give the combined indole-benzimidazoles.
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