A straightforward route to 4H-1,4-benzoxazine-2-carbaldehydes by Swern oxidation
Swern oxidation of saturated (1,4-benzoxazine-2-yl)-methanols 2 furnished 4H-1,4-benzoxazine-2-carbaldehydes 3, which possess an α,β ethylenic bond. The reactivity of these compounds was examined.