Iridium(III)-Catalyzed C-H Amidation of Nitrones with Dioxazolones.

Various amidated nitrones were efficiently achieved through Ir(III)-catalyzed direct C-H amidation of nitrones with good to excellent yields and tolerance of broad functional groups. This reaction smoothly proceeded at room temperature in the absence of acid or base in a short reaction time. Carbon dioxide was generated as the sole byproduct, thus providing an environmentally benign amidation process. The title products could be efficiently transformed to substituted benzisoxazoline.