The bis-1,4-dimesityl-1,2,3-triazol-5-ylidene–palladium complex (1a) successfully catalyzes the Mizoroki–Heck and Sonogashira coupling reactions with aryl bromides to give the corresponding alkenes and alkynes, respectively, in good to excellent yields. In the Mizoroki–Heck reaction, electron-rich, electron-poor, and functionalized aryl bromides and alkenes are tolerated, while the substrates are limited
Copper−Carbene Complexes as Catalysts in the Synthesis of Functionalized Styrenes and Aliphatic Alkenes
作者:Hélène Lebel、Michaël Davi、Silvia Díez-González、Steven P. Nolan
DOI:10.1021/jo061781a
日期:2007.1.1
2-propanol. The copper catalysts are not only inexpensive compared to rhodium complexes, but they also exhibit better functional group compatibility with aromatic aldehydes and ketones. Indeed very high yields were obtained for the formation of styrenes containing nitro, trifluoromethyl, amino, and ester groups, as well as for pyridine-, pyrrole-, and indole-substituted alkenes.
Asymmetric Synthesis of All-Carbon Benzylic Quaternary Stereocenters via Conjugate Addition to Alkylidene and Indenylidene Meldrum’s Acids
作者:Ashraf Wilsily、Eric Fillion
DOI:10.1021/jo901559d
日期:2009.11.20
aryl group consistently leading to high enantioselectivities. The nature of the organozinc reagent on the efficiency and selectivity of the conjugateaddition was also investigated. The solid-state conformation was determined for a number of alkylidene Meldrum’s acids and correlated with the observed enantioselectivity in relation to the arene pattern of substitution.
A copper- and amine-free Sonogashira coupling reaction promoted by a ferrocene-based phosphinimine-phosphine ligand at low catalyst loading
作者:Antonio Arques、David Auñon、Pedro Molina
DOI:10.1016/j.tetlet.2004.03.194
日期:2004.5
A palladium(II) complex containing a ferrocene-based phosphinimine-phosphine ligand was applied to the amine- and copper-free Sonogashiracoupling of aryl iodides and aryl bromides with terminal alkynes using 1 equiv of tetrabutylammonium acetate as an activator. The corresponding disubstituted alkynes were obtained in high yields and TONs using 0.1 mol % Pd-catalyst.
Oxine based unsymmetrical (O<sup>−</sup>, N, S/Se) pincer ligands and their palladium(<scp>ii</scp>) complexes: synthesis, structural aspects and applications as a catalyst in amine and copper-free Sonogashira coupling
作者:Satyendra Kumar、Fariha Saleem、Manish Kumar Mishra、Ajai K. Singh
DOI:10.1039/c7nj00067g
日期:——
L3 and L4. Upon reaction with Na2PdCl4/[Pd(CH3CN)2Cl2], L1–L4 coordinated as a (O−, N, E) donor (E = S/Se) resulting in complexes [Pd(L–H)Cl] (1–4; L = L1–L4). The molecular structures of L1, 1 and 2 were established by single crystal X-ray diffraction. The palladium in 1 and 2 has a nearly square planar geometry. The Pd–S bonddistance in 1 is 2.2648(14) Å and in 2, the Pd–Se bonddistance is 2.3641(7)