Ruthenium-Catalyzed Direct Transformation of Alkenyl Oximes to 5-Cyanated Isoxazolines: A Cascade Approach Based on Non-Stabilized Radical Intermediate
A convenient method offers an easy access to 5‐cyanated isoxazolines in good to high yields and shows good functional group tolerance and high efficiency. In this protocol, tert‐butyl nitrte plays a dual role, acting as an oxidant as well as a nitrogen source. Remarkably, this new reaction avoids using any toxic radical initiator or cyanide reagents and constructs C–O and C≡N triple bonds in a single‐step
approach for the synthesis of isoxazoline derivatives is reported. This protocol involves 1,3-dipolarcycloaddition between in situ generated nitrileoxides from the corresponding aldoximes using [hydroxy(tosyloxy)iodo]benzene (HTIB, Koser’s reagent) and maleimides, styrene and acrylonitrile. The described methodology is very attractive as it is operationally simple, has broad scope, and does not require