An enantioselective organocatalytic intramolecular ring-closing Friedel-Crafts-type alkylation of indolyl
![](/i<font color=)
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mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-unsaturated aldehydes has beendeveloped. This powerful new strategy allows enantioselective access to THPIs and THBCs in a straightforward and atom-economical
manner.