High Selectivity from Configurational Match/Mismatch in Carbon−Hydrogen Insertion Reactions of Steroidal Diazoacetates Catalyzed by Chiral Dirhodium(II) Carboxamidates
作者:Michael P. Doyle、Simon B. Davies、Eric J. May
DOI:10.1021/jo015932f
日期:2001.11.1
in products from carbon-hydrogeninsertion in high yield and selectivities. Use of S-configured catalysts shows a distinctive preference for insertion into the 3-position to form beta-lactone products. The R-configured catalysts direct insertion preferentially to the equatorial C-H bond at the 2-position. Substituents or functional groups at the 5/6-position prevent C-H insertion from taking place