Aza-Claisen rearrangement in the cyclization reactions of nitrogen-containing enynes via ruthenium vinylidene complexes
Journal
Organometallics
Journal Volume
29
Journal Issue
22
Pages
5776-5782
Date Issued
2010
Author(s)
Abstract
The cyclization reaction of several diallyl aromatic amine molecules, each containing an ethynyl group at the ortho position of the aromatic ring, is accompanied by an aza-Claisen rearrangement, causing an allyl group migration to give substituted indole compounds. This cyclization is catalyzed by ruthenium triphenylphosphine and diphenylphosphinoethane (dppe) complexes as well as gold complexes with silver reagent. The less sterically crowded dppe complex is a more efficient catalyst. The mechanism involving a vinylidene intermediate is proposed on the basis of isolation of several intermediates in the ruthenium-catalyzed system. Single crystals of a metal complex with the cyclized ligand were obtained, and the structure was determined by an X-ray diffraction analysis.
SDGs
Type
journal article