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Clark, Jillian S. K.; Ferguson, Michael J.; McDonald, Robert; Stradiotto, Mark
Angewandte Chemie International Edition, May 6, 2019, Volume: 58, Issue: 19Journal Article
Base‐metal catalysts capable of enabling the assembly of heteroatom‐dense molecules by cross‐coupling of primary heteroarylamines and (hetero)aryl chlorides, while sought‐after given the ubiquity of unsymmetrical di(hetero)arylamino fragments in pharmacophores, are unknown. Herein, we disclose the new “double cage” bisphosphine PAd2‐DalPhos (L2). The derived air‐stable NiII pre‐catalyst C2 functions well at low loadings in challenging test C−N cross‐couplings with established substrates, and facilitates the first Ni‐catalyzed C−N cross‐couplings of primary five‐ or six‐membered ring heteroarylamines and activated (hetero)aryl chlorides, with synthetically useful scope that is competitive with Pd catalysis. Cage match: A nickel(II) pre‐catalyst featuring the new double cage PAd2‐DalPhos ancillary ligand enables the first examples of Ni‐catalyzed C−N cross‐couplings of primary five‐ or six‐membered ring heteroarylamines and (hetero)aryl chlorides with synthetically useful scope.
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