A new palladium‐catalyzed intramolecular oxidativecycloisomerization of readily available starting materials, 2‐cinnamyl‐1,3‐dicarbonyls, has been demonstrated for the creation of structurally diverse 2‐benzyl furans. The cycloisomerization occurs by a regioselective 5‐exo‐trig pathway. The reaction shows a broad substrate scope with good to excellent yields. Furthermore, a one‐pot procedure has been
Synthesis of Tetrasubstituted Furan Derivatives by Condensation of 1,3-Diketones with Cyclic α-Hydroxy-β-oxo Esters
作者:Barhiem Schickmous、Jens Christoffers
DOI:10.1002/ejoc.201402388
日期:2014.7
alicyclic and heterocyclic α-hydroxy-β-oxo esters under acidic conditions [0.1 equiv. cerium(III) salt in AcOH]. With [b]-annulated 4-acyl-3-hydroxy-5-methylfuran-2-carboxylates as common intermediates, the reaction proceeded along different pathways depending on the starting materials used: Alicyclic α-hydroxy-β-oxo esters gave cycloalkane-annulated furans as products. The ester group was lost after