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Rh(III)-Catalyzed Redox-Neutral Unsymmetrical C-H Alkylation and Amidation Reactions of N-Phenoxyacetamides.
Journal of the American Chemical Society 2018 January 11
A Rh(III)-catalyzed unsymmetrical C-H alkylation and amidation of N-phenoxyacetamides with diazo compounds has been developed under mild and redox-neutral conditions, producing dinitrogen as the only byproduct. The reaction represents the first example of one-step, unsymmetrical difunctionalization of two ortho-C-H bonds. Experimental and computational studies support that N-phenoxyacetamides most likely undergo an initial ortho-C-H alkylation with diazo compounds via a Rh(III)-catalyzed C-H activation, and the resulting Rh(III) intermediate subsequently undergoes an intramolecular oxidative addition into the O-N bond to form a Rh(V) nitrenoid species that is protonated and further directed toward electrophilic addition to the second ortho position of the phenyl ring. This work might provide a new direction for unsymmetrical C-H difunctionalization reactions in an efficient manner.
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