<i>N</i>-Heterocyclic Carbene/Palladium Cascade Catalysis: Construction of 2,2-Disubstitiuted Benzofuranones from the Reaction of 3-(2-Formylphenoxy)propenoates with Allylic Esters
carbene (NHC) and palladium/ligand was demonstrated. In the presence of a triazolium salt, palladiumcatalyst, and base, the reaction of 3-(2-formylphenoxy)propenoates and allylic esters proceeded efficiently under mild conditions to afford 2-allylbenzofuran-3-one-2-acetates in moderated to good yields. An asymmetric cascade catalysis was achieved when (R)-BINAP was employed as a chiral ligand, producing
A Novel [3+2] Dipolar
Cycloaddition Approach to Hexahydrobenzofuro[3,2-<i>b</i>]pyrroles
作者:Ikyon Kim、Hee-Kyung Na、Kyung Kim、Sun Kim、Ge Lee
DOI:10.1055/s-2008-1077951
日期:——
A highly stereoselective intramolecular 1,3-dipolar cycloaddition reaction of azomethine ylides derived from 2-vinyloxybenzaldehydes proceeded smoothly to allow for a direct access to tricyclic hexahydrobenzofuro[3,2-b]pyrroles in good yields.