Palladium-Catalyzed Oxygenative Cross-Coupling of Ynamides and Benzyl Bromides by Carbene Migratory Insertion

2018 ◽  
Vol 130 (10) ◽  
pp. 2746-2750 ◽  
Author(s):  
Yunpeng Gao ◽  
Guojiao Wu ◽  
Qi Zhou ◽  
Jianbo Wang
2020 ◽  
Vol 56 (91) ◽  
pp. 14287-14290
Author(s):  
Kaichuan Yan ◽  
Maoyao He ◽  
Jianglian Li ◽  
Hua He ◽  
Ruizhi Lai ◽  
...  

A palladium-catalyzed cross-coupling reaction of sulfoxonium ylides with benzyl bromides is reported, which could afford polysubstituted olefins and features good substrate tolerance.


2013 ◽  
Vol 52 (28) ◽  
pp. 7084-7097 ◽  
Author(s):  
Tjøstil Vlaar ◽  
Eelco Ruijter ◽  
Bert U. W. Maes ◽  
Romano V. A. Orru

2015 ◽  
Vol 51 (68) ◽  
pp. 13321-13323 ◽  
Author(s):  
Haiqing Luo ◽  
Guojiao Wu ◽  
Shuai Xu ◽  
Kang Wang ◽  
Chaoqiang Wu ◽  
...  

A palladium-catalyzed cross-coupling reaction of electron-deficient aryl fluorides with aryl N-tosylhydrazones, which involves C–F bond activation and migratory insertion of palladium carbene, has been developed.


ChemInform ◽  
2013 ◽  
Vol 44 (46) ◽  
pp. no-no
Author(s):  
Tjoestil Vlaar ◽  
Eelco Ruijter ◽  
Bert U. W. Maes ◽  
Romano V. A. Orru

2020 ◽  
Author(s):  
Jian Cao ◽  
Ernest Armenta ◽  
Lisa Boatner ◽  
Heta Desai ◽  
Neil Chan ◽  
...  

Bioorthogonal chemistry is a mainstay of chemoproteomic sample preparation workflows. While numerous transformations are now available, chemoproteomic studies still rely overwhelmingly on copper-catalyzed azide –alkyne cycloaddition (CuAAC) or 'click' chemistry. Here we demonstrate that gel-based activity-based protein profiling (ABPP) and mass-spectrometry-based chemoproteomic profiling can be conducted using Suzuki–Miyaura cross-coupling. We identify reaction conditions that proceed in complex cell lysates and find that Suzuki –Miyaura cross-coupling and CuAAC yield comparable chemoproteomic coverage. Importantly, Suzuki–Miyaura is also compatible with chemoproteomic target deconvolution, as demonstrated using structurally matched probes tailored to react with the cysteine protease caspase-8. Uniquely enabled by the observed orthogonality of palladium-catalyzed cross-coupling and CuAAC, we combine both reactions to achieve dual protein labeling.


2020 ◽  
Author(s):  
Baojian Xiong ◽  
Yue Li ◽  
Yin Wei ◽  
Søren Kramer ◽  
Zhong Lian

Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance and low cost of phenols. Here, we report a dual nickel/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryl triflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60 examples). Furthermore, it displays low sensitivity to steric effects demonstrated by the synthesis of a 2,2’disubstituted biaryl and a fully substituted aryl product. The widespread presence of phenols in natural products and pharmaceuticals allow for straightforward late-stage functionalization, illustrated with examples such as Ezetimibe and tyrosine. NMR spectroscopy and DFT calculations indicate that the nickel catalyst is responsible for activating the aryl triflate, while the palladium catalyst preferentially reacts with the aryl tosylate.


2020 ◽  
Author(s):  
Evgeny Tretyakov ◽  
Svetlana Zhivetyeva ◽  
Pavel Petunin ◽  
Dmitry Gorbunov ◽  
Nina Gritsan ◽  
...  

<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>


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