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
The Gold(I)-Mediated Domino Reaction to Fused Diphenyl Phosphoniumfluorenes: Mechanistic Consequences for Gold-Catalyzed Hydroarylations and Application in Solar Cells
作者:Sebastian Arndt、Jan Borstelmann、Rebeka Eshagh Saatlo、Patrick W. Antoni、Frank Rominger、Matthias Rudolph、Qingzhi An、Yana Vaynzof、A. Stephen K. Hashmi
DOI:10.1002/chem.201800460
日期:2018.6.4
involving a phosphinoauration and a gold‐catalyzed 6‐endo‐digcyclization step, was developed. Starting from modular and simple‐to‐prepare phosphadiynes, π‐extended phosphoniumfluorenes were synthesized. The mechanistic proposal was supported by kinetic measurements and by the trapping of key intermediates. These led to important conclusions for the gold‐catalyzedhydroarylation mechanism. Cyclic voltammetry
A One-Pot Method for the Synthesis of Phenylalkynyl-Substituted Terminal Alkynes by Deprotection/Stannylation followed by a Migita–Kosugi–Stille coupling
A practical one-pot approach for the synthesis of arylalkynyl-substituted terminalalkynes has been developed through a deprotection/ stannylation of a phenylethynyl phosphine oxide followed by Migita–Kosugi–Stille coupling, avoiding the longer synthetic route involving repeated deprotection/Sonogashira coupling. Other features of this approach include mild reaction conditions, excellent yields, facile
Cascade Reactions of Aryl‐Substituted Terminal Alkynes Involving in Situ‐Generated α‐Imino Gold Carbenes
作者:Qiaoying Sun、Christopher Hüßler、Justin Kahle、Alexandra V. Mackenroth、Matthias Rudolph、Petra Krämer、Thomas Oeser、A. Stephen K. Hashmi
DOI:10.1002/anie.202313738
日期:2024.1.25
was achieved. It proceeds via an intermolecular gold carbene generation/C−H annulation followed by a 6-endo-dig cyclization or Pictet–Spengler reactions to selectively form fused indoles. The formation of 2-substitutedindoles and imidazoles derivatives through gold-catalyzed cyclization is also presented.
Polyaromatic Ribbon/Benzofuran Fusion via Consecutive Endo Cyclizations of Enediynes
作者:Philip M. Byers、Julian I. Rashid、Rana K. Mohamed、Igor V. Alabugin
DOI:10.1021/ol302922t
日期:2012.12.7
The Sonogashira/5-endo-dig/6-endo-dig cascade fuses a polycyclic aromatic backbone to the electron-rich furan subunit. The transformation proceeds in modest yields as a one-pot reaction. Efficiency of the full cascade is increased by removal of base prior to the addition of gold catalyst. Under these conditions, conversion to the full cascade products is achieved in nearly quantitative yields without purification of the intermediate products. Extension of the cascade toward triynes opens access to benzofuran-fused chrysene derivatives.