Facile synthesis of 9 H -pyrrolo[1,2- a ]indoles via Brønsted acid catalyzed cascade reactions

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An efficient Brønsted acid catalyzed Friedel-Crafts alkenylation/1,6-addition/condensation cascade reaction has been developed. This protocol enables effective access to various highly functionalized 9H-pyrrolo[1,2-a]indoles in moderate to high yields. Mechanistic studies indicate that the in situ vinylogous reactivity intermediate might be formed in the catalytic system.