Synthesis of fused oxazole-containing coumarin derivatives via oxidative cross coupling reaction using a combination of CuCl2 and TBHP

RSC Advances ◽  
2016 ◽  
Vol 6 (23) ◽  
pp. 18891-18894 ◽  
Author(s):  
Md. Belal ◽  
Abu T. Khan
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coumarin Derivatives ◽  
Cross Coupling Reaction

Various fused oxazoles containing coumarin derivatives were synthesized via an oxidative cross coupling reaction by employing 20 mol% CuCl2 as the catalyst and TBHP as an oxidant.

An efficient synthesis of 4-substituted coumarin derivatives via a palladium-catalyzed Suzuki cross-coupling reaction

2014 ◽  
Vol 55 (49) ◽  
pp. 6627-6630 ◽  
Author(s):  
Trideep Rajale ◽  
Shikha Sharma ◽  
Daniel A. Stroud ◽  
Daniel K. Unruh ◽  
Emily Miaou ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coumarin Derivatives ◽  
Efficient Synthesis ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed

Oxidative cross coupling reaction mediated by I2/H2O2: a novel approach for the construction of fused thiazole containing coumarin derivatives

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 104155-104163 ◽  
Author(s):  
Md. Belal ◽  
Abu T. Khan
Keyword(s):  
Bond Activation ◽  
Sodium Sulfide ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Coumarin Derivatives ◽  
Novel Approach ◽  
Cross Coupling Reaction

Various 2-phenyl-4H-chromeno(3,4-d)thiazol-4-one derivatives have been synthesized through C–H bond activation using sodium sulfide as a source of sulfur atoms and by employing I2 as a catalyst and H2O2 as the terminal oxidant.

ChemInform Abstract: An Efficient Synthesis of 4-Substituted Coumarin Derivatives via a Palladium-Catalyzed Suzuki Cross-Coupling Reaction.

ChemInform ◽  
2015 ◽  
Vol 46 (16) ◽  
pp. no-no
Author(s):  
Trideep Rajale ◽  
Shikha Sharma ◽  
Daniel A. Stroud ◽  
Daniel K. Unruh ◽  
Emily Miaou ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coumarin Derivatives ◽  
Efficient Synthesis ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed

Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical

2020 ◽  
Author(s):  
Evgeny Tretyakov ◽  
Svetlana Zhivetyeva ◽  
Pavel Petunin ◽  
Dmitry Gorbunov ◽  
Nina Gritsan ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Ferromagnetic Coupling ◽  
Nitronyl Nitroxide ◽  
Triplet Ground State ◽  
One Dimensional ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed ◽  
Ferromagnetic Chain ◽  
High Yields

<p>Verdazyl-nitroxide diradicals were synthesized using the palladium-catalyzed cross-coupling reaction of the corresponding iodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex with high yields (up to 82%). The synthesized diradicals were found to be highly thermally stable and have a singlet (D<i>E</i><sub>ST</sub> » -64 cm<sup>–1</sup>) or triplet ground state (D<i>E</i><sub>ST</sub> ³ 25 and 100 cm<sup>–1</sup>), depending on which canonical hydrocarbon diradical type they belong to. Upon crystallization, triplet diradicals form unique one-dimensional (1D) spin <i>S</i> = 1 chains of organic diradicals with intrachain ferromagnetic coupling of <i>J</i>′/<i>k</i><sub>B</sub> from 3 to 6 K.</p>

An Iron-Based Catalyst Enables The Enantioconvergent Synthesis of Chiral 1,1-Diarylalkanes Through a Suzuki-Miyaura Cross-Coupling Reaction

2020 ◽  
Author(s):  
Chet Tyrol ◽  
Nang Yone ◽  
Connor Gallin ◽  
Jeffery Byers
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Radical Intermediates ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Boronic Esters ◽  
Carbon Centered Radical ◽  
Iron Based ◽  
High Yields

By using an iron-based catalyst, access to enantioenriched 1,1-diarylakanes was enabled through an enantioselective Suzuki-Miyaura crosscoupling reaction. The combination of a chiral cyanobis(oxazoline) ligand framework and 1,3,5-trimethoxybenzene additive were essential to afford high yields and enantioselectivities in cross-coupling reactions between unactivated aryl boronic esters and a variety of benzylic chlorides, including challenging ortho-substituted benzylic chloride substrates. Mechanistic investigations implicate a stereoconvergent pathway involving carbon-centered radical intermediates.

Ni(0)-Catalyzed α-Allylic Alkylation of Regular Ketones with 1,3-Dienes under pH and Redox-neutral Conditions

2019 ◽  
Author(s):  
Tiantian Chen ◽  
Yang Yang ◽  
Liyu Xie ◽  
Haijian Yang ◽  
Guangbin Dong ◽  
...  
Keyword(s):  
Oxidative Addition ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Dual Role ◽  
Allylic Alkylation ◽  
Cross Coupling Reaction ◽  
Neutral Conditions

<p>We report a Ni(0)-catalyzed cross coupling reaction between simple ketones and 1,3-dienes. A variety of a-allylic alkylation products were formed in an 1,2-addition manner with excellent regioselectivity. Water was found to significantly accelerate this transformation. A HO-Ni-H species generated from oxidative addition of Ni(0) to H<sub>2</sub>O is proposed to play a “dual role” in activating both the ketone and the diene substrate.</p>

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