A facile one-pot synthesis of benzimidazoles from 2-nitroanilines by reductive cyclization.

[摘要]：A facile one-pot process to prep. benzimidazole derivs. is described. Reductive cyclization of a series of 2-nitroanilines with orthoesters in the presence of Pd/C in methanol at room temp., which is promoted by a catalytic amt. of acetic acid, affords the corresponding benzimidazole derivs. in high yields.

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