One‐Pot Synthesis of Benzoxazoles via the Metal‐Free ortho‐C—H Functionalization of Phenols with Nitroalkanes.

PPA-activated nitroalkanes are employed in the design of a one-pot cascade transformation involving metal-free and oxidant-free direct ortho-C–H functionalization, followed by Beckman rearrangement and intramolecular cyclocondensation to produce benzoxazoles and benzobisoxazoles directly from easily available phenols.