Pd-catalyzed carboetherification of β,γ-unsaturated oximes:: A novel approach to Δ2-isoxazolines

A novel route to the synthesis of Delta(2)-isoxazoline derivatives is described. Reaction of beta,gamma-unsaturated oximes with aryl bromides via palladium-catalyzed carboetherification affords 3,5-disubstituted Delta(2)-isoxazolines in good yields. The use of Xantphos as ligand is crucial for the transformation. The carboetherification products can be further converted to beta-hydroxy ketones in the presence of Fe powder and NH(4)Cl.