NiXantphos: A Deprotonatable Ligand for Room-Temperature Palladium-Catalyzed Cross-Couplings of Aryl Chlorides
作者:Jiadi Zhang、Ana Bellomo、Nisalak Trongsiriwat、Tiezheng Jia、Patrick J. Carroll、Spencer D. Dreher、Matthew T. Tudge、Haolin Yin、Jerome R. Robinson、Eric J. Schelter、Patrick J. Walsh
DOI:10.1021/ja411855d
日期:2014.4.30
remarkable chemoselectivity in the presence of aryl chloride substrates bearing heteroaryl groups and sensitive functional groups that are known to undergo 1,2-addition, aldol reaction, and O-, N-, enolate-α-, and C(sp2)–H arylations. The advantages and importance of the Pd–NiXantphos catalyst system outlined herein make it a valuable contribution for applications in Pd-catalyzed arylationreactions with
Palladium-Catalyzed C(sp<sup>3</sup>)–H Arylation of Diarylmethanes at Room Temperature: Synthesis of Triarylmethanes via Deprotonative-Cross-Coupling Processes
作者:Jiadi Zhang、Ana Bellomo、Andrea D. Creamer、Spencer D. Dreher、Patrick J. Walsh
DOI:10.1021/ja3047816
日期:2012.8.22
this approach is an in situ metalation of the substrate via C-H deprotonation under catalytic cross-coupling conditions, which is referred to as a deprotonative-cross-coupling process (DCCP). Base and catalyst identification were performed by high-throughput experimentation (HTE) and led to a unique base/catalyst combination [KN(SiMe(3))(2)/Pd-NiXantphos] that proved to efficiently promote the room-temperature