Rhodium( ii )-catalyzed divergent intramolecular tandem cyclization of N - or O -tethered cyclohexa-2,5-dienones with 1-sulfonyl-1,2,3-triazole: synthesis of cyclopropa[ cd ]indole and benzofuran derivatives

A novel rhodium( ii )-catalyzed divergent intramolecular tandem cyclization of N - or O -tethered cyclohexa-2,5-dienones and 1-sulfonyl-1,2,3-triazole is disclosed, affording cyclopropa[ cd ]indole and benzofuran derivatives in moderate to good yields.