Preparation of 2-aminobenzophenones and polysubstituted quinolines through SmI2 promoted reductive cleavage of 3-aryl-2,1-benzisoxazoles

Intramolecular Fe(II)-catalyzed N-O or N-N bond formation from aryl azides

Iron(II) bromide catalyzes the transformation of aryl and vinyl azides with ketone or methyl oxime substituents into 2,1-benzisoxazoles, indazoles, or pyrazoles through the formation of an N-O or N-N bond. This transformation tolerates a variety of different functional groups to facilitate access to a range of benzisoxazoles or indazoles. The unreactivity of the Z-methyloxime indicates that N-heterocycle formation occurs through a nucleophilic attack of the ketone or oxime onto an activated planar iron azide complex.