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A method for convenient synthesis of N-alkyl-2-aryl-indole-3-carbaldehyde has been described. A variety of highly valuable indolyl aldehydes have been prepared through this method. Electron donating groups on both aromatic rings (anilinyl and benzyl) facilitate the formation of the desired products. A benzylic C-H insertion by rhodium carbene is the key step for this transformation.

Vinyl azide with a pendent diene can undergo thermal decomposition to a related azirine intermediate, which was used immediately in an intramolecular aza-Diels-Alder reaction to furnish an aziridine-containing trans-fused tricyclic core structure with excellent stereoselectivity. The method provides a facile entry to complex polycyclic alkaliods which can be further elaborated by ring-opening reactions and ring expansion of the aziridine moiety, as well as by dihydroxylation of the alkene group.

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N-Aryl-N-allyl-bis-functionalized amino-1-sulfonyl-1,2,3-trizoles undergo rhodium-catalyzed cyclization reactions and subsequent hydrolytic cleavage of the sulfonyl imine to give two structurally distinct N-heterocycles, 3-indolyl aldehydes and 3-azabicycloA C H T U N G T R E N N U N G [3,1,0]hexyl aldehydes. The product ratio can be tuned by varying the electronic properties of the two functional groups attached to the N atom. Based on these findings, two efficient and general methods