Metal-Reductant-Free Electrochemical Nickel-Catalyzed Couplings of Aryl and Alkyl Bromides in Acetonitrile
作者:Robert J. Perkins、Alexander J. Hughes、Daniel J. Weix、Eric C. Hansen
DOI:10.1021/acs.oprd.9b00232
日期:2019.8.16
attractive approach for the synthesis of complex molecules at both small and large scale, two barriers for large-scale applications have remained: the use of stoichiometric metalreductants and a need for amide solvents. In this communication, new conditions that address these challenges are reported. The nickel-catalyzed reductive cross-coupling of aryl bromides with alkyl bromides can be conducted in a
Coupling of Challenging Heteroaryl Halides with Alkyl Halides via Nickel-Catalyzed Cross-Electrophile Coupling
作者:Eric C. Hansen、Changfeng Li、Sihang Yang、Dylan Pedro、Daniel J. Weix
DOI:10.1021/acs.joc.7b01334
日期:2017.7.21
importance, the synthesis of alkylated heterocycles from the cross-coupling of Lewis basic nitrogen heteroaryl halides with alkyl halides remains a challenge. We report here a general solution to this challenge enabled by a new collection of ligands based around 2-pyridyl-N-cyanocarboxamidine and 2-pyridylcarboxamidine cores. Both primary and secondary alkyl halides can be coupled with 2-, 3-, and 4-pyridyl
Electrochemical Nickel Catalysis for Sp<sup>2</sup>-Sp<sup>3</sup> Cross-Electrophile Coupling Reactions of Unactivated Alkyl Halides
作者:Robert J. Perkins、Dylan J. Pedro、Eric C. Hansen
DOI:10.1021/acs.orglett.7b01598
日期:2017.7.21
catalytic nickel complexes in sp2-sp3 cross-electrophile coupling reactions has been developed. The electrochemical reduction provides reliable nickel catalyst activation and turnover and offers a tunable parameter for reaction optimization, in contrast to more standard activated metal powder reductants. The electrochemical reactions give yields (i.e., 51–86%) and selectivities as high or superior to
Di(2-picolyl)amines as Modular and Robust Ligands for Nickel-Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Electrophile Coupling
作者:Alexander J. Rago、Aristidis Vasilopoulos、Amanda W. Dombrowski、Ying Wang
DOI:10.1021/acs.orglett.2c03346
日期:2022.11.25
reaction, because noncommercial analogues usually entail challenging syntheses. In this work, di(2-picolyl)amines (DPAs) are explored as an alternative modular ligand class for the nickel-catalyzed aryl–alkyl cross-electrophile coupling. Novel DPA ligands were synthesized directly from inexpensive amine and pyridine building blocks in a single step. This facile synthetic route enabled the parallel synthesis