A new reactivity pattern of Rh(II)-N-arylnitrenes was discovered that facilitates the synthesis of medium-sized N-heterocycles from ortho-cyclobutanol-substituted aryl azides. The key ring-expansion step of the catalytic cycle is both chemoselective and stereospecific. Our mechanistic experiments implicate the formation of a rhodium N-arylnitrene catalytic intermediate and reveal that sp C-H bond amination of this electrophilic species is competitive with the ring-expansion process.
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| http://dx.doi.org/10.1021/jacs.7b01833 | DOI Listing |
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