scholarly journals Copper-catalyzed α-selective hydrostannylation of alkynes for the synthesis of branched alkenylstannanes

2015 ◽  
Vol 51 (53) ◽  
pp. 10616-10619 ◽  
Author(s):  
H. Yoshida ◽  
A. Shinke ◽  
Y. Kawano ◽  
K. Takaki
Keyword(s):  
Copper Catalysis ◽  
Terminal Alkynes ◽  
Universal System

A universal system for highly α-selective hydrostannylation of terminal alkynes has been developed by use of a distannane or a silylstannane as a stannylating reagent under copper catalysis.

Competitive Copper Catalysis in the Condensation of Primary Nitro Compounds with Terminal Alkynes: Synthesis of Isoxazoles

2016 ◽  
Vol 2016 (27) ◽  
pp. 4643-4655 ◽  
Author(s):  
Ausilia Baglieri ◽  
Luca Meschisi ◽  
Francesco De Sarlo ◽  
Fabrizio Machetti
Keyword(s):  
Nitro Compounds ◽  
Copper Catalysis ◽  
Terminal Alkynes

scholarly journals Borylstannylation of alkynes with inverse regioselectivity: copper-catalyzed three-component coupling using a masked diboron

2015 ◽  
Vol 51 (29) ◽  
pp. 6297-6300 ◽  
Author(s):  
H. Yoshida ◽  
Y. Takemoto ◽  
K. Takaki
Keyword(s):  
Triple Bond ◽  
Copper Catalysis ◽  
Terminal Alkynes ◽  
Straightforward Manner ◽  
Three Component Coupling

Masked boryl and stannyl moieties are smoothly installed into a carbon–carbon triple bond of diverse terminal alkynes under copper catalysis to provide cis-boryl(stannyl)alkenes in a straightforward manner. The regioselectivity is totally inverted to those of the previous borylstannylations, where a masked boryl moiety is attached to an internal carbon of alkynes.

Relay Palladium/Copper Catalysis Enabled Silylative [5 + 1] Benzannulation Using Terminal Alkynes as One-Carbon Units

2020 ◽  
Vol 22 (21) ◽  
pp. 8544-8549 ◽  
Author(s):  
Li-Jun Wu ◽  
Fan Teng ◽  
Gui-Fen Lv ◽  
Jin-Heng Li
Keyword(s):  
Copper Catalysis ◽  
Terminal Alkynes

scholarly journals Origins of Internal Regioselectivity in Copper-Catalyzed Borylation of Terminal Alkynes

2021 ◽  
Author(s):  
Takumi Tsushima ◽  
Hideya Tanaka ◽  
Kazuki Nakanishi ◽  
Masaaki Nakamoto ◽  
Hiroto Yoshida
Keyword(s):  
Chemical Synthesis ◽  
Cross Coupling ◽  
Lewis Acidity ◽  
Copper Catalysis ◽  
Terminal Alkynes ◽  
Challenging Issue ◽  
Universal Approach ◽  
Copper Center

<p>Installation of a boron functionality into a more substituted carbon of terminal alkynes has been a challenging issue in chemical synthesis, since inherently Lewis acidic boron moieties, in principle, favor their attachment to a terminal carbon. Herein, we report on the highly internal-selective borylation of terminal alkynes under copper catalysis, wherein diminishment of boron-Lewis acidity and ligand-derived steric bulk around a copper center are the key to the success. In particular, the use of an anthranilamide-substituted boron moiety [B(aam)] is of high synthetic significance, because its properly diminished Lewis acidity enabled the internal regioselectivity and the Suzuki–Miyaura cross-coupling activity to be compatibly achieved. This method provided direct and universal approach to variously substituted branched alkenylboron compounds, regardless of electronic and steric properties of a substituent on terminal alkynes.</p>

scholarly journals Origins of Internal Regioselectivity in Copper-Catalyzed Borylation of Terminal Alkynes

2021 ◽  
Author(s):  
Takumi Tsushima ◽  
Hideya Tanaka ◽  
Kazuki Nakanishi ◽  
Masaaki Nakamoto ◽  
Hiroto Yoshida
Keyword(s):  
Chemical Synthesis ◽  
Cross Coupling ◽  
Lewis Acidity ◽  
Copper Catalysis ◽  
Terminal Alkynes ◽  
Challenging Issue ◽  
Universal Approach ◽  
Copper Center

<p>Installation of a boron functionality into a more substituted carbon of terminal alkynes has been a challenging issue in chemical synthesis, since inherently Lewis acidic boron moieties, in principle, favor their attachment to a terminal carbon. Herein, we report on the highly internal-selective borylation of terminal alkynes under copper catalysis, wherein diminishment of boron-Lewis acidity and ligand-derived steric bulk around a copper center are the key to the success. In particular, the use of an anthranilamide-substituted boron moiety [B(aam)] is of high synthetic significance, because its properly diminished Lewis acidity enabled the internal regioselectivity and the Suzuki–Miyaura cross-coupling activity to be compatibly achieved. This method provided direct and universal approach to variously substituted branched alkenylboron compounds, regardless of electronic and steric properties of a substituent on terminal alkynes.</p>

Copper Catalysis for Selective Heterocoupling of Terminal Alkynes

2016 ◽  
Vol 138 (38) ◽  
pp. 12348-12351 ◽  
Author(s):  
Lebin Su ◽  
Jianyu Dong ◽  
Long Liu ◽  
Mengli Sun ◽  
Renhua Qiu ◽  
...  
Keyword(s):  
Copper Catalysis ◽  
Terminal Alkynes

Copper-Catalyzed Hydrocarboxylation of Allenes

2019 ◽  
Author(s):  
Rémi blieck ◽  
Marc Taillefer ◽  
Florian Monnier
Keyword(s):  
Carboxylic Acids ◽  
Copper Catalysis ◽  
Ligand Free ◽  
First Time

The addition of carboxylic acids to allenes was performed for the first time with copper catalysis. The hydrocarboxylation reaction is totally regio- and stereoselective, ligand-free and used catalytic amounts of copper and base.

Major Approaches to Assessing the Fiscal Sustainability of the Constituent Entities of the Russian Federation

2020 ◽  
Vol 26 (6) ◽  
pp. 577-583
Author(s):  
L. A. Tuaeva ◽  
I. Z. Toguzova ◽  
S. K. Tokaeva
Keyword(s):  
Russian Federation ◽  
Systems Approach ◽  
Fiscal Sustainability ◽  
Qualitative Assessment ◽  
Universal System ◽  
Russian Scientific ◽  
Analysis And Synthesis ◽  
The Russian Federation ◽  
State And Local

The presented study develops theoretical and methodological foundations for assessing the fiscal sustainability of the constituent entities of the Russian Federation in perspective.Aim. The study aims to develop a systems approach to assessing the fiscal sustainability of the constituent entities of the Russian Federation in the medium and long term.Tasks. The authors analyze the major approaches to assessing the fiscal sustainability of federal subjects and determine the significance of quantitative and qualitative assessment methods in the development of a methodology for assessing the fiscal sustainability of federal subjects in the medium and long term.Methods. This study uses scientific methods of cognition, analysis and synthesis, comparison and analogy, systems and institutional approaches to assess the fiscal sustainability of federal subjects.Results. The authors examine the major approaches to assessing the fiscal sustainability of federal subjects developed by Russian scientific schools and disciplines; approaches used by state and local authorities; approaches to assessing the fiscal sustainability of federal subjects used by international and national rating agencies; foreign experience. In general, this implies the development of a universal system of indicators for assessing the fiscal sustainability of federal subjects.Conclusions. It is substantiated that under the current conditions of new challenges, particularly in the context of the coronavirus pandemic, it is necessary to assess the long-term balance and sustainability of the budgets of federal subjects using a systems approach based on quantitative and qualitative methods, making allowance for the medium- and long-term prospects to make efficient management decisions at different levels of the economic system.

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