A tandem isomerization/prins strategy: iridium(III)/Brønsted acid cooperative catalysis.

@article{Lombardo2013ATI,
  title={A tandem isomerization/prins strategy: iridium(III)/Br{\o}nsted acid cooperative catalysis.},
  author={Vince M. Lombardo and Christopher D. Thomas and Karl A Scheidt},
  journal={Angewandte Chemie},
  year={2013},
  volume={52 49},
  pages={
          12910-4
        }
}
Working together: A mild and efficient isomerization/protonation sequence generates pyran-fused indoles by cooperative catalysis between cationic iridium(III) and Bi(OTf)3 . Three distinct cyclization manifolds lead to the corresponding bioactive scaffolds in good yields. In addition, N-substituted indoles can be synthesized enantioselectively in the presence of a chiral phosphate. 
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