Heterogenization of Pd–NHC complexes onto a silica support and their application in Suzuki–Miyaura coupling under batch and continuous flow conditions
作者:Alberto Martínez、Jamin L. Krinsky、Itziar Peñafiel、Sergio Castillón、Konstantin Loponov、Alexei Lapkin、Cyril Godard、Carmen Claver
DOI:10.1039/c4cy00829d
日期:——
Immobilised Pd–NHC catalysts were successfully applied in Suzuki–Miyaura reaction under batch and flow conditions.
固定化的Pd-NHC催化剂成功地应用于批量和流动条件下的Suzuki-Miyaura反应。
Unified Protocol for Fe-Based Catalyzed Biaryl Cross-Couplings between Various Aryl Electrophiles and Aryl Grignard Reagents
作者:Lei Wang、Yi-Ming Wei、Yan Zhao、Xin-Fang Duan
DOI:10.1021/acs.joc.9b00151
日期:2019.5.3
Ti(OEt)4/PhOM enabled a highly general iron-based catalyst system, which could efficiently catalyze the biaryl coupling reaction between various electrophiles (I, Br, Cl, OTs, OCONMe2, OSO2NMe2) and common or functionalized aryl Grignardreagents with high functional group tolerance. Selective couplings of aryl iodides and bromides over the corresponding oxygen-based electrophiles have been achieved, and
A Pd‐catalyzedSuzuki cross‐coupling of arylboronicacids with Yagupolskii–Umemoto reagents was explored. In contrary to trifluoromethylations, the Pd‐catalyzedreaction of R−B(OH)2 and [Ar2SCF3]+[OTf]− provided the arylation products (R−Ar) in good to high yields. The reaction confirms that the S−Ar bonds of [Ar2SCF3]+[OTf]− can be readily cleaved in the presence of Pd complexes. The relatively electron‐poor
Nickel- or Cobalt-Catalyzed Cross-Coupling of Arylsulfonic Acid Salts with Grignard Reagents
作者:Christian A. Malapit、Michael D. Visco、Jonathan T. Reeves、Carl A. Busacca、Amy R. Howell、Chris H. Senanayake
DOI:10.1002/adsc.201500304
日期:2015.7.6
arylsulfonic acid salts as electrophiles in a nickel‐ or cobalt‐catalyzedcross‐coupling with Grignard reagents is described. Bis(tricyclohexylphosphine)nickel dichloride [NiCl2(PCy3)2] was found to be the optimal catalyst, and reactions with this catalyst proceeded in most cases at roomtemperature. The analogous cobalt catalyst [CoCl2(PCy3)2] was also found to promote the cross‐coupling reaction at higher
and methodologically novel self‐assembled multilayer nickel nanoparticle (NP) catalyst – sulfur‐modified gold‐supported Ni NPs (SANi) – for organic synthesis. The SANi catalyst was easily prepared through a three‐step procedure involving simultaneous in situ metal NP and nanospace organization. This unique method does not require any conventional preformed template for immobilizing and stabilizing