Dual Gold Catalysis: σ,π-Propyne Acetylide and Hydroxyl-Bridged Digold Complexes as Easy-To-Prepare and Easy-To-Handle Precatalysts
作者:A. Stephen K. Hashmi、Tobias Lauterbach、Pascal Nösel、Mie Højer Vilhelmsen、Matthias Rudolph、Frank Rominger
DOI:10.1002/chem.201203010
日期:2013.1.14
series of dinuclear goldσ,π‐propyne acetylidecomplexes were prepared and tested for their catalytic ability in dualgoldcatalysis that was based on the reaction of an electrophilic π‐complex of gold with a goldacetylide. The air‐stable and storable catalysts can be isolated as silver‐free catalysts in their activated form. These dual catalysts allow a fast initiation phase for the dual catalytic cycles
Gold-Catalyzed Intermolecular CS Bond Formation: Efficient Synthesis of α-Substituted Vinyl Sulfones
作者:Yumeng Xi、Boliang Dong、Edward J. McClain、Qiaoyi Wang、Tesia L. Gregg、Novruz G. Akhmedov、Jeffrey L. Petersen、Xiaodong Shi
DOI:10.1002/anie.201310142
日期:2014.4.25
A general method for the synthesis of α‐substituted vinyl sulfones makes use of a combination of a triazole gold complex and gallium triflate. This efficientCS bond formation between simple terminal alkynes and sulfinic acids provides access to various α‐substituted vinyl sulfones.
Gold-Catalyzed Formal [3 + 2] Cycloaddition of Ynamides with 4,5-Dihydro-1,2,4-oxadiazoles: Synthesis of Functionalized 4-Aminoimidazoles
作者:Wei Xu、Gaonan Wang、Ning Sun、Yuanhong Liu
DOI:10.1021/acs.orglett.7b01469
日期:2017.6.16
A gold-catalyzed formal [3 + 2] cycloaddition of ynamides with 4,5-dihydro-1,2,4-oxadiazoles has been developed. The reaction provides a concise and regioselective access to highly functionalized 4-aminoimidazoles likely via the formation of an α-imino gold carbene intermediate followed by cyclization. 4,5-Dihydro-1,2,4-oxadiazole was found to act as an efficient N-iminonitrene equivalent in these
Indolesynthesis by a gold(I)‐catalyzed intermolecular formal [4+2] reactionbetween 1,3‐diynes and pyrroles has been developed. This reaction involves the hydroarylation of 1,3‐diynes with pyrroles followed by an intramolecular hydroarylation to give the 4,7‐disubstituted indoles. This reaction can also be applied to the synthesis of carbazoles when indoles are used as the nucleophiles instead of
In total and formal syntheses of dictyodendrins B, C, E, and F, the key step involved the direct construction of the pyrrolo[2,3‐c]carbazole core by the gold‐catalyzed annulation of a conjugated diyne with a pyrrole to form three bonds and two aromatic rings. The subsequent introduction of substituents at the C1 (Suzuki–Miyaura coupling), C2 (addition to an aldehyde), N3 (alkylation), and C5 positions
在双脱硫木糖醇B,C,E和F的全部和形式合成中,关键步骤涉及通过金催化的共轭二炔与吡咯的环化反应直接构建吡咯并[2,3- c ]咔唑核三个键和两个芳香环。随后在C1(Suzuki-Miyaura偶联),C2(加成醛),N3(烷基化)和C5位置(乌尔曼偶联)处引入取代基提供了不同的途径获得十碳五苯醚。