An efficient catalytic method is presented for the hydrogenation of N‐heterocycles. The iridium‐based catalyst operates under mild conditions in water without any co‐catalyst or stoichiometric additives. The catalyst also promotes the reverse reaction of dehydrogenation of N‐heterocycles, hence displaying appropriate characteristics for a future hydrogen economy based on liquid organic hydrogen carriers
copper-catalyzed reduction of azaarenes with diboronicacid as reductant in an aprotic solvent under mild conditions has been developed. Most interestingly, the nitroazaarenes could be reduced exclusively to give the corresponding amines without touching the azaarene moieties. Furthermore, the reductive amination of aromatic nitro compounds and aromatic aldehydes has also been realized. A series of
Half-Sandwich Ruthenium Complexes for One-Pot Synthesis of Quinolines and Tetrahydroquinolines: Diverse Catalytic Activity in the Coupled Cyclization and Hydrogenation Process
作者:Xue-Jing Yun、Jing-Wei Zhu、Yan Jin、Wei Deng、Zi-Jian Yao
DOI:10.1021/acs.inorgchem.0c00955
日期:2020.6.1
the direct one-pot synthesis of tetrahydroquinoline derivatives from amino alcohols and ketones has been also developed on the basis of the continuous catalytic activity of this rutheniumcatalyst in the selective hydrogenation of the obtained quinoline derivatives with a low catalyst loading. The corresponding products, quinolines and tetrahydroquinoline derivatives, were afforded in good to excellent
Low‐Temperature Nickel‐Catalyzed C−N Cross‐Coupling via Kinetic Resolution Enabled by a Bulky and Flexible Chiral
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‐Heterocyclic Carbene Ligand
作者:Zi‐Chao Wang、Pei‐Pei Xie、Youjun Xu、Xin Hong、Shi‐Liang Shi
DOI:10.1002/anie.202103803
日期:2021.7.12
The transition-metal-catalyzed C−N cross-coupling has revolutionized the construction of amines. Despite the innovations of multiple generations of ligands to modulate the reactivity of the metal center, ligands for the low-temperature enantioselective amination of arylhalides remain a coveted target of catalyst engineering. Designs that promote one elementary reaction often create bottlenecks at
Catalytic Aerobic Dehydrogenation of Nitrogen Heterocycles Using Heterogeneous Cobalt Oxide Supported on Nitrogen-Doped Carbon
作者:Andrei V. Iosub、Shannon S. Stahl
DOI:10.1021/acs.orglett.5b01790
日期:2015.9.18
Dehydrogenation of (partially) saturated heterocycles provides an important route to heteroaromaticcompounds. A heterogeneous cobalt oxide catalyst, previously employed for aerobic oxidation of alcohols and amines, is shown to be effective for aerobic dehydrogenation of various 1,2,3,4-tetrahydroquinolines to the corresponding quinolines. The reactions proceed in good yields under mild conditions