Gold-Catalyzed Dimeric Cyclization of Isoeugenol and Related 1-Phenylpropenes in Ionic Liquid: Environmentally Friendly and Stereoselective Synthesis of 1,2,3-Trisubstituted 2,3-Dihydro-1H-indenes

Gold-catalyzed dimerization of isoeugenol and related 1-phenylpropenes in ionic liquid enabled environmentally friendly, stereoselective synthesis of 1,2,3-trisubstituted 2,3-dihydro-1H-indenes. Dimerization of isoeugenol or isohomogenol afforded diisoeugenol or diisohomogenol, respectively, with -configuration, whereas dimerization of -asarone furnished diasarone with -configuration.