The reaction of 3-halo-5,6-dihydro-4H-1,2-oxazine N-oxides with arynes was studied. Arynes were generated from o-silylaryl triflates and underwent consecutive [3+2]-cycloaddition/[4+2]-cycloreversion with N-oxides leading to substituted 3-vinyl-benzisoxazoles in high yields. In the...