Carboxylation of Aryl Triflates with CO<sub>2</sub> Merging Palladium and Visible-Light-Photoredox Catalysts
作者:Samir Kumar Bhunia、Pritha Das、Shantanu Nandi、Ranjan Jana
DOI:10.1021/acs.orglett.9b01532
日期:2019.6.21
visible-light-promoted, highly practical carboxylation of readily accessible aryl triflates at ambient temperature and a balloon pressure of CO2 by the combined use of palladium and photoredox Ir(III) catalysts. Strikingly, the stoichiometric metallic reductant is replaced by a nonmetallic amine reductant providing an environmentally benign carboxylation process. In addition, one-potsynthesis of a carboxylic
Mild and Efficient Nickel-Catalyzed Heck Reactions with Electron-Rich Olefins
作者:Thomas M. Gøgsig、Jonatan Kleimark、Sten O. Nilsson Lill、Signe Korsager、Anders T. Lindhardt、Per-Ola Norrby、Troels Skrydstrup
DOI:10.1021/ja2084509
日期:2012.1.11
A new efficient protocol for the nickel-catalyzed Heckreaction of aryl triflates with vinyl ethers is presented. Mild reaction conditions that equal those of the corresponding palladium-catalyzed Heckreaction are applied, representing a practical and more sustainable alternative to the conventional regioselective arylation of vinyl ethers. A catalytic system comprised of Ni(COD)(2) and 1,1'-bis(
Cross‐Electrophile C(sp
<sup>2</sup>
)−Si Coupling of Vinyl Chlorosilanes
作者:Jicheng Duan、Ke Wang、Guang‐Li Xu、Shaolin Kang、Liangliang Qi、Xue‐Yuan Liu、Xing‐Zhong Shu
DOI:10.1002/anie.202010737
日期:2020.12.14
C−Si bond remains unexplored. Here we report a cross‐electrophile Csp2‐Si coupling reaction of vinyl/aryl electrophiles with vinyl chlorosilanes. This new protocol offers an approach for facile and precise synthesis of organosilanes with high molecular diversity and complexity from readily available materials. The reaction proceeds under mild and non‐basic conditions, demonstrating a high step economy
作者:Hai T. Dao、Chao Li、Quentin Michaudel、Brad D. Maxwell、Phil S. Baran
DOI:10.1021/jacs.5b05144
日期:2015.7.1
problem of olefin hydromethylation is presented. This highly chemoselective method can tolerate labile and reactive chemical functionalities and uses a simple set of reagents. An array of olefins, including mono-, di-, and trisubstituted olefins, are all smoothly hydromethylated. This mild protocol can be used to simplify the synthesis of a specific target or to directly “edit” complex natural products
Sulfonate Versus Sulfonate: Nickel and Palladium Multimetallic Cross-Electrophile Coupling of Aryl Triflates with Aryl Tosylates
作者:Kai Kang、Liangbin Huang、Daniel J. Weix
DOI:10.1021/jacs.0c04670
日期:2020.6.17
While phenols are frequent and convenient aryl sources in cross-coupling, typically as sulfonate esters, the direct cross-Ullmann coupling of two different sulfonate esters is unknown. We report here a general solution to this chal-lenge catalyzed by a combination of Ni and Pd with Zn reductant and LiBr as an additive. The reaction has broad scope, as demonstrated in 33 examples (65% ± 11% ave yield)