Cu/N-ligand/TEMPO catalytic system was first applied to the aerobic oxidative synthesis of heterocycles. As demonstrated, 2-substituted quinazolines and 4H-3,1-benzoxazines were synthesized efficiently from the one-pot reaction of aldehydes with 2-aminobenzylamines and 2-aminobenzyl alcohols, respectively, by employing CuCl/DABCO/4-HO-TEMPO as the catalysts and oxygen as the terminal oxidant.
Cu / N-配体/ TEMPO催化体系首先被用于杂环的好氧氧化合成。如所证明的,通过使用CuCl / DABCO / 4-HO-TEMPO分别由醛与2-氨基苄胺和2-氨基苄醇的一锅反应有效地合成了2-取代的喹唑啉和4 H -3,1-苯并恶嗪。作为催化剂,氧气作为末端氧化剂。
Dehydrogenation of Nitrogen Heterocycles Using Graphene Oxide as a Versatile Metal-Free Catalyst under Air
作者:Jingyu Zhang、Shiya Chen、Fangfang Chen、Wensheng Xu、Guo-Jun Deng、Hang Gong
DOI:10.1002/adsc.201700178
日期:2017.7.17
Graphene oxide (GO) has been developed as an inexpensive, environmental friendly, metal‐free carbocatalyst for the dehydrogenation of nitrogenheterocycles. Valuable compounds, such as quinoline, 3,4‐dihydroisoquinoline, quinazoline, and indole derivatives, have been successfully used as substrates. The investigation of various oxygen‐containing molecules with different conjugated systems indicated
Gold(0) catalyzed dehydrogenation of N-heterocycles
作者:Elumalai Kumaran、Weng Kee Leong
DOI:10.1016/j.tetlet.2018.09.050
日期:2018.10
Gold nanoclusters are good catalyst precursors for the catalytic dehydrogenation of indolines, tetrahydroquinazolines, and related N-heterocycles. The catalytically active species is presumably Au(0) nanoparticles.
aerobic oxidative dehydrogenation of N-heterocycles were examined in detail. Many tetrahydroquinoline derivatives and a broad range of other N-heterocycles could be tolerated by the catalytic system using a biomass-derived solvent as a reaction medium. Newly generated mixed crystal phases, noticeably enhanced surface areas and labile lattice oxygen of the OMS-2-based nanocomposite catalysts might contribute
Electrochemical Acceptorless Dehydrogenation of N-Heterocycles Utilizing TEMPO as Organo-Electrocatalyst
作者:Yong Wu、Hong Yi、Aiwen Lei
DOI:10.1021/acscatal.7b04137
日期:2018.2.2
Catalytic acceptorless dehydrogenation (CAD) has been a basically important organic transformation to ubiquitous unsaturated compounds without the usage of a sacrificial hydrogen acceptor. In this work, we successfully developed the first electrochemical acceptorless dehydrogenation (ECAD) of N-heterocycles using TEMPO as the organo-electrocatalyst. We have achieved the catalyticdehydrogenation of