Results 21 to 30 of about 41,386 (303)

Ligand-Assisted Gold-Catalyzed Efficient Alkynylative Cyclization with Terminal Alkynes Using H2O2 as Oxidant

, 2022
The gold-catalyzed cyclization-functionalization is a powerful approach to construct high-value organic molecules. However, current strategies mainly rely on expensive external oxidants or pre-functionalized substrates, which exhibit low atom economy and
Matthias, Rudolph, Tao, Wang, Jun, Li, Hongwei, Shi, Martin C., Dietl, Frank, Rominger, Philipp M., Stein, A. Stephen K., Hashmi, Petra, Krämer   +8 more
core   +1 more source

Recent Advances in the Addition of Amide/Sulfonamide Bonds to Alkynes

Molecules, 2019
The addition of amide/sulfonamide bonds to alkynes is not only one of the most important strategies for the direct functionalization of carbon–carbon triple bonds, but also a powerful tool for the downstream transformations of amides/sulfonamides ...
Fei Zhao, Pinyi Li, Xiaoyan Liu, Xiuwen Jia, Jiang Wang, Hong Liu   +5 more
doaj   +1 more source

Synthesis of N-perfluoroalkyl-3,4-disubstituted pyrroles by rhodium-catalyzed transannulation of N-fluoroalkyl-1,2,3-triazoles with terminal alkynes

Beilstein Journal of Organic Chemistry, 2021
The rhodium-catalyzed transannulation of N-perfluoroalkyl-1,2,3-triazoles with aromatic and aliphatic terminal alkynes under microwave heating conditions afforded N-perfluoroalkyl-3,4-disubstituted pyrroles (major products) and N-fluoroalkyl-2,4 ...
Olga Bakhanovich, Viktor Khutorianskyi, Vladimir Motornov, Petr Beier   +3 more
doaj   +1 more source

Masked alkynes for synthesis of threaded carbon chains

, 2023
Polyynes are chains of sp1 carbon atoms with alternating single and triple bonds. As they become longer, they evolve towards carbyne, the 1D allotrope of carbon, and they become increasingly unstable.
Prakhar, Gupta, Amber, Thompson, Anthony, Parker, Yueze, Gao, Harry, Anderson, Connor, Patrick   +5 more
core   +1 more source

Chemoselective Biohydrogenation of Alkenes in the Presence of Alkynes for the Homologation of 2‐Alkynals/3‐Alkyn‐2‐ones into 4‐Alkynals/Alkynols [PDF]

Advanced Synthesis & Catalysis, 2019
AbstractThe chemoselective hydrogenation of alkenes in the presence of alkynes is a very challenging transformation to achieve with traditional chemical methods. The development of an effective procedure to perform this transformation would enrich the tool‐kit available to organic chemists for the development of useful synthetic routes, and the ...
Colombo D., Brenna E., Gatti F. G., Ghezzi M. C., Monti D., Parmeggiani F., Tentori F.   +6 more
openaire   +3 more sources

Iron-catalyzed carboazidation of alkenes and alkynes

Nature Communications, 2019
Carboazidation of alkenes and alkynes holds the promise to construct valuable, functionalized molecules. Here, the authors report a general and efficient iron-catalyzed carboazidation of both alkenes and alkynes enabled by t-butyl perbenzoate.
Haigen Xiong, Nagarajan Ramkumar, Mong-Feng Chiou, Wujun Jian, Yajun Li, Ji-Hu Su, Xinhao Zhang, Hongli Bao   +7 more
doaj   +1 more source

Design, development and applications of copper-catalyzed regioselective (4 + 2) annulations between diaryliodonium salts and alkynes

Communications Chemistry, 2022
Intermolecular (4 + 2) cycloaddition with alkynes is a powerful approach to construct isocoumarin moieties, however, regioselectivity remains challenging for the transition metal-catalyzed approach.
Weilin Wang, Junrui Zhou, Chao Wang, Congdi Zhang, Xiao-Qian Zhang, Youliang Wang   +5 more
doaj   +1 more source

Functionalization of remote C(sp3)-H bonds enabled by copper-catalyzed coupling of O-acyloximes with terminal alkynes

Nature Communications, 2020
Sonogashira cross-coupling is a powerful strategy to prepare functionalized internal alkynes. Here, the authors report a domino sequence for the generation of γ-/δ-alkynyl nitriles and γ-alkynyl ketones from the coupling of terminal alkynes with O ...
Zhaodong Li, Rubén O. Torres-Ochoa, Qian Wang, Jieping Zhu   +3 more
doaj   +1 more source

The Effect of N-Donor Ligands on the Reaction of Ruthenium Hydrides with 1-Alkynes

, 2016
Neutral ruthenium hydrides Ru(CO)ClH(L)(PPh3)2 bearing one N-donor ligand react with 1-alkynes at 23 °C to yield neutral alkenyl complexes Ru(CO)Cl(CHCHR)(L)(PPh3)2.
Antonio M. Echavarren (1299936), Amelia Santos (3084375), Javier López (638357), Juan J. González (3039825), Pilar Tinoco (3084378), Amalia Galán (3084381)   +5 more
core   +1 more source

Mechanochemical Desymmetrization of Unbiased Bis- and Tris-alkynes to Access 3,5-Isoxazoles-Alkyne Adducts and Unsymmetrical Bis-3,5-isoxazoles

, 2022
A mechanochemical desymmetrization of symmetrical bis- and tris-alkynes via a controlled 1,3-dipolar cycloaddition reaction with nitrile oxide dipoles has been developed.
Irini , Trakakis, Rafael A., Hernandez R., Jean-Louis , Do, Tomislav , Friščić, Pat , Forgione, Louis A., Cuccia   +5 more
core   +1 more source