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Rhodium(I)‐catalyzed enantioselective intramolecular cyclization of enynes having a hydroxy group in the tether was investigated, and various cyclic compounds possessing a chiral quaternary carbon center were obtained in high yields with high ees. In this cyclization, a Rh−C(sp2) bond in the rhodacyclopentene intermediate, which was formed by enantioselective oxidative cycloaddition of enynes to a...
Ein chirales quartäres Kohlenstoffzentrum im Ring kann durch RhI‐katalysierte Cyclisierung von Eninen eingeführt werden, wie Y. Oonishi, Y. Sato et al. in ihrer Zuschrift auf S. 8828 schildern. Die Cyclisierung verläuft über die Spaltung der Rh‐C(sp2)‐Bindung des chiralen Rhodacyclus durch eine O‐H‐Bindung des Substituenten, gefolgt von β‐Hydrideliminierung aus dem resultierenden Oxarhodacyclus sowie...
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