Amplification of Asymmetric Induction in Sequential Reactions of Bis-diazoacetates Catalyzed by Chiral Dirhodium(II) Carboxamidates
作者:Michael P. Doyle、Yuanhua Wang、Pejman Ghorbani、Erhard Bappert
DOI:10.1021/ol0520121
日期:2005.10.1
[reaction: see text] Two sequential intramolecularcarbon-hydrogeninsertion or cyclopropanation reactions of bis-diazoacetates using chiral dirhodium(II) carboxamidate catalysts are reported. The initial metal carbene transformation forms an excess of one enantiomer that with the second transformation further enhances stereocontrol (kinetic amplification). Diastereoselectivity and enantioselectivity