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The reaction of 3-benzoylquinoxalin-2(1H)-ones with enamines (generated in situ from ammonium acetate and the corresponding methylaryl(hetaryl)ketones) proceeds smoothly to give the corresponding substituted 1-(pyrrolyl)benzimidazolone derivatives in moderate yields through the novel rearrangement of 3-benzoylquinoxalin-2(1H)-ones involving a dual cleavage of the C3═N4 and C2-C3 bonds under mild conditions.

Besides amino acids, which react under through decarboxylation, alkyl amines, diamines, and aminoalcohols serve as aminomethylene sources.

The rearrangement process includes a novel ring contraction as the key step to produce various benzimidazole structures bearing a pyrrole part at one of the nitrogens.

The title catalytic system as an uncharged nanosized catalytic complex gives high yields (≥90%) of the aerobic cross-coupling reaction of aryl halides and phenylboronic acid at 25 °C.

Substituted imidazolidin-2-ones have been synthesised by the interaction of imidazol-2-one with 2-methylresorcinol and pyrogallol in a chloroform solution in the presence of trifluoroacetic acid.

Reactions of 3,5-di-tert-butyl-4-hydroxybenzyl acetate with indole and its derivatives gave a series of sterically hindered phenolic compounds having various functional groups. The products are potentially capable of inhibiting radical chain oxidation processes according to different mechanisms.