Diversification of Amidyl Radical Intermediates Derived from CH Aminopyridylation
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abstract
CH amination chemistry promises to streamline access to nitrogen-containing fine chemicals. The typical need for N-activating substituents such of N-sulfonyl groups, which are challenging to remove and difficult to engage in synthetic elaboration limits synthetic utility. Here, we demonstrate that N-benzylaminopyridinium species, generated by CH aminopyridylation, provide a platform for synthetic elaboration via reductive NN bond activation to unveil electrophilic N-centered radicals. These reactive intermediates can be trapped either via anti-Markovnikov olefin carboamination to provide access to tetrahydroisoquinolines, which are important heterocycles in molecular therapeutics, or via aza-Rubottom chemistry with silyl enol ethers to provide alpha-amino ketones. This approach broadens the synthetic utility of N-alkylaminopyridinium intermediates and demonstrates a new approach to CH amination with synthetically addressable, bifunctional reagents.
