Indole-5-carbonitrile → 3-(4-hydroxybutanoyl)-1H-indole-5-carbonitrile

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The present inventors have further surprisingly and unexpectedly found that 3-(4-hydroxybutyl)-1H-indole-5-carbonitrile intermediate can be prepared, in high purity and with high yield, by reacting 5-cyanoindole with 4-chlorobutyryl chloride in the presence of aluminium chloride to produce an intermediate compound, followed by reacting the compound with an aqueous alcohol to produce 3-(4-hydroxybutyryl)-1H-indole-5-carbonitrile, which is then reduced with sodium cyanoborohydride in the presence of hydrochloric acid and water in acetonitrile solvent to produce 3-(4-hydroxybutyl)-1H-indole-5-carbonitrile.

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