Au(I)/Ag(I)-Catalyzed Cascade Approach for the Synthesis
of Benzo[4,5]imidazo[1,2‑<i>c</i>]pyrrolo[1,2‑<i>a</i>]quinazolinones
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Abstract
An
efficient and facile Au(I)/Ag(I)-catalyzed cascade method has
been developed for one-pot synthesis of the complex polycyclic heterocycles
benzo[4,5]imidazo[1,2-<i>c</i>]pyrrolo[1,2-<i>a</i>]quinazolinone derivatives through treatment of the substituted 2-(1<i>H</i>-benzo[<i>d</i>]imidazol-2-yl)anilines with 4-pentynoic
acid or 5-hexynoic acid. The strategy features a Au(I)/Ag(I)-catalyzed
one-pot cascade process involving the formation of three new C–N
bonds in high yields, and with broad a substrate scope