An efficient use of NiCl2·6H2O, for the cross-coupling of arylboronicacids with various N-nucleophiles, has been demonstrated. The method is practical and offers an alternative to the corresponding Cu-mediated Chan–Lam process for the construction of the C–N bond.
Intermolecular Reductive C–N Cross Coupling of Nitroarenes and Boronic Acids by P<sup>III</sup>/P<sup>V</sup>═O Catalysis
作者:Trevor V. Nykaza、Julian C. Cooper、Gen Li、Nolwenn Mahieu、Antonio Ramirez、Michael R. Luzung、Alexander T. Radosevich
DOI:10.1021/jacs.8b10769
日期:2018.11.14
intermolecular C-N coupling is reported. The method employs a small-ring organophosphorus-based catalyst (1,2,2,3,4,4-hexamethylphosphetane) and a terminal hydrosilane reductant (phenylsilane) to drive reductive intermolecular coupling of nitro(hetero)arenes with boronic acids. Applications to the construction of both Csp2-N (from arylboronic acids) and Csp3-N bonds (from alkylboronicacids) are demonstrated;
Alkyltelluro Substitution Improves the Radical-Trapping Capacity of Aromatic Amines
作者:Jia-fei Poon、Jiajie Yan、Vijay P. Singh、Paul J. Gates、Lars Engman
DOI:10.1002/chem.201602377
日期:2016.8.26
The synthesis of a variety of aromatic amines carrying an ortho‐alkyltelluro group is described. The new antioxidants quenched lipidperoxyl radicals much more efficiently than α‐tocopherol and were regenerable by aqueous‐phase N‐acetylcysteine in a two‐phase peroxidation system. The inhibition time for diaryl amine 9 b was four‐fold longer than recorded with α‐tocopherol. Thiol consumption in the aqueous
Asymmetric Cycloisomerization of <i>o</i>
-Alkenyl-<i>N</i>
-Methylanilines to Indolines by Iridium-Catalyzed C(sp<sup>3</sup>
)−H Addition to Carbon-Carbon Double Bonds
diphosphine effectively promotes the intramolecular addition of the C(sp3)−H bond across a carbon–carbon double bond in a highly enantioselective fashion. The reaction gives indolines bearing a quaternary stereogenic carbon center at the 3‐position. The reactionmechanism involves rate‐determining oxidative addition of the N‐methyl C−H bond, followed by intramolecular carboiridation and subsequent reductive