Combinatorial Approach to Chiral Tris-ligated Carbophilic Platinum Complexes: Application to Asymmetric Catalysis
作者:Alexandre Pradal、Serafino Gladiali、Veronique Michelet、Patrick Y. Toullec
DOI:10.1002/chem.201304794
日期:2014.6.2
the synthesis of libraries of chiral tris‐ligated cationic platinumcomplexes and their in situ evaluation as asymmetriccarbophilic catalysts in a model domino hydroarylation/cyclization reaction of a 1,6‐enyne was developed. A catalyst‐generation process based on a combination of a monodentate and a bidentate phosphorus ligand allowed the formation of 108 chiralcomplexes. One‐pot screening of the stereoinduction
Asymmetric Au-catalyzed domino cyclization/nucleophile addition reactions of enynes in the presence of water, methanol and electron-rich aromatic derivatives
作者:Alexandre Pradal、Chung-Meng Chao、Maxime R. Vitale、Patrick Y. Toullec、Véronique Michelet
DOI:10.1016/j.tet.2011.03.071
日期:2011.6
system is described for the asymmetric domino cyclization/functionalization reactions of functionalized 1,6-enynes in the presence of an external nucleophile. The use of (R)-4-MeO-3,5-(t-Bu)2-MeOBIHEP ligand associated with gold led to clean rearrangements implying the formal addition of an oxygen or carbon nucleophile to an alkene followed by a cyclization process. The enantiomeric excesses were highly
作者:Chung-Meng Chao、Maxime R. Vitale、Patrick Y. Toullec、Jean-Pierre Genêt、Véronique Michelet
DOI:10.1002/chem.200802341
日期:2009.1.26
Gold efficiency: An efficient AuI catalytic system is described for the enantioselective hydroarylation/cyclization reaction of 1,6‐enynes (see scheme). Use of the (R)‐4‐MeO‐3,5‐(tBu)2‐MeOBIPHEP–gold complex led to clean rearrangements implying the formal addition of a carbon nucleophile (1,3,5‐trimethoxybenzene, 1,3‐dimethoxybenzene, pyrrole, 1,3,5‐trimethoxy‐2‐bromobenzene and indole derivatives)
Small Gold(I) and Gold(I)–Silver(I) Clusters by C−Si Auration
作者:Xiao‐Li Pei、Ana Pereira、Ekaterina S. Smirnova、Antonio M. Echavarren
DOI:10.1002/chem.202001509
日期:2020.6.5
3c–2e Au−C−M bonds (M=Au/Ag). Hexagold clusters [Au6L4](X)2 are obtained by reaction of (L−TMS)AuCl with AgX, whereas reaction with AgX and Ag2O leads to gold–silver clusters [Au4Ag2L4](X)2. Oxo‐trigold(I) species [Au3O]+ were identified as the intermediates in the formation of the silver‐doped clusters. Other [Au5], [Au4Ag], and [Au12Ag4] clusters were also obtained. Clusters containing PAu−Au−AuP structural
邻三甲基硅基芳基膦的金化导致金和金银簇的形成,其中邻位金属化膦显示 3c-2e Au−C−M 键 (M=Au/Ag)。六金簇[Au 6 L 4 ](X) 2是通过(L−TMS)AuCl 与AgX 反应获得的,而与AgX 和Ag 2 O 反应则得到金银簇[Au 4 Ag 2 L 4 ](X ) 2 . 氧代三金(I)物质[Au 3 O] +被确定为银掺杂簇形成的中间体。还获得了其他[Au 5 ]、[Au 4 Ag]和[Au 12 Ag 4 ]簇。含有 PAu−Au−AuP 结构基序的簇在均相条件下在炔烃的活化中表现出良好的催化活性。
Variations on the Theme of JohnPhos Gold(I) Catalysts: Arsine and Carbene Complexes with Similar Architectures
作者:Javier Carreras、Ana Pereira、Margherita Zanini、Antonio M. Echavarren
DOI:10.1021/acs.organomet.8b00276
日期:2018.10.22
carbene gold(I) complexes with architectures closely related to those of 2-(di-tert-butylphosphino)biphenyl gold(I) complexes have been prepared and structurally characterized. As predicted, 2-(di-tert-butylarsine)biphenyl gold(I) complexes are more electrophilic catalysts in comparison to their phosphine analogues, whereas those based on 4-arylindazole behave similarly to NHC-gold(I) catalysts.