Grignard Reagent/CuI/LiCl-Mediated Stereoselective Cascade Addition/Cyclization of Diynes: A Novel Pathway for the Construction of 1-Methyleneindene Derivatives
作者:De-Yao Li、Yin Wei、Min Shi
DOI:10.1002/chem.201302191
日期:2013.11.11
Diynes containing a cyclopropane group smoothly undergo a novel intramolecular and stereoselective cascade addition/cyclization reaction to produce the corresponding 1‐methyleneindene derivatives in moderate to good yields. This interesting transformation is mediated by Grignard reagent/CuI with LiCl as an additive under mild conditions. The obtained product can easily be further functionalized through
CO Extrusion in Homogeneous Gold Catalysis: Reactivity of Gold Acyl Species Generated through Water Addition to Gold Vinylidenes
作者:Janina Bucher、Tim Stößer、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201409859
日期:2015.1.26
describe a new gold‐catalyzed decarbonylative indene synthesis. Synergistic σ,π‐activation of diyne substrates leads to gold vinylidene intermediates, which upon addition of water are transformed into gold acyl species, a type of organogold compound hitherto only scarcely reported. The latter are shown to undergo extrusion of CO, an elementary step completely unknown for homogeneousgoldcatalysis. By tuning
Dual Gold-Catalyzed Three-Component Reaction: Efficient Synthesis of Indene-Fused Esters, Acids, and Lactones through Gold Vinylidene Intermediates
作者:Congjun Yu、Xiaodong Ma、Bin Chen、Bencan Tang、Robert S. Paton、Guozhu Zhang
DOI:10.1002/ejoc.201700084
日期:2017.3.17
A dual gold(I)‐catalyzed three‐component reaction is developed to prepare indene‐fused carboxylic acid derivatives from diynes, alcohols, and pyridine N‐oxides in both inter‐ and intramolecular fashions. Pyridine N‐oxides exhibit unique reactivity and selectivity to oxidize the gold vinylidene. Experimental studies and DFT calculations support ketene formation as the key step.
Aurated Aryl Cations as Halogen Abstractors – Easy Access to 1-Halogenated Naphthalenes
作者:Michael Schukin、Thomas Wurm、Janina Bucher、Martin C. Dietl、Caroline J. Aschendorf、Matthias Rudolph、Frank Rominger、Jürgen Graf、A. Stephen K. Hashmi
DOI:10.1021/acscatal.3c03907
日期:2024.2.2
1,5-Diynes bearing two terminal alkyne functionalities are converted into highly reactive naphthyl cation intermediates by a gold(I) catalyst with a sterically demanding ligand. This highly electrophilic intermediate is utilized for the abstraction of halogens from appropriate solvents (e.g., DCE).
The gold-catalyzed one-pot synthesis of 3H-benzo[e]isoindoles (3) from a mixture of isoxazole (2) and diynamides (1) is described. This tandem catalysis involves two separate steps: (i) initial synthesis of 2-(3-pyrrolyl)-1-alkynylbenzenes and (ii) a novel alkyne/pyrrole coupling reaction through pyrrole dearomatization. Our control experiments reveal the cooperative action of the gold catalyst and
描述了由异恶唑( 2 )和二炔酰胺( 1 )的混合物金催化一锅法合成3H-苯并[ e ]异吲哚( 3 )。这种串联催化涉及两个独立的步骤:(i)2-(3-吡咯基)-1-炔基苯的初始合成和(ii)通过吡咯脱芳构化的新型炔/吡咯偶联反应。我们的对照实验揭示了金催化剂和异恶唑助催化剂的协同作用,使新型炔/吡咯偶联能够导致 1,2-酰基转移。