Copper-Catalyzed Divergent Trifluoromethylation/Cyclization of Unactivated Alkenes
作者:Jing Zheng、Ziyang Deng、Yan Zhang、Sunliang Cui
DOI:10.1002/adsc.201500965
日期:2016.3.3
Most of the precedent copper‐catalyzed trifluoromethylation reactions of unactivatedalkenes concern terminalalkenes, and these processes are terminated in elimination, or nucleophilic addition, or semipinacol rearrangement, or CH bond functionalization steps. In this study, we develop a trifluoromethylation method for both unactivatedterminal and internal alkenes to enable divergent late‐stage
Synthesis of Spiro-dihydroquinoline and Octahydrophenanthrene Derivatives via Palladium-Catalyzed Intramolecular Oxidative Arylation
作者:Zhong-Lin Zang、Shuklachary Karnakanti、Sheng Zhao、Ping Hu、Zhen Wang、Pan-Lin Shao、Yun He
DOI:10.1021/acs.orglett.7b00228
日期:2017.3.17
A method for intramolecular sp2 C–H oxidative arylation of unactivated cyclic olefins has been developed to access spiro-dihydroquinoline and octahydrophenanthrene derivatives in a straightforward and efficient manner. Bearing picolinamide as a directing group, the alkenyl anilines cyclized to afford spiro-dihydroquinolines in moderate to excellent yields via direct oxidative arylation, while the alkenyl
Pd-Catalyzed Remote Site-Selective and Stereoselective C(Alkenyl)–H Alkenylation of Unactivated Cycloalkenes
作者:Chun-Li Mao、Sheng Zhao、Zhong-Lin Zang、Lin Xiao、Cheng-He Zhou、Yun He、Gui-Xin Cai
DOI:10.1021/acs.joc.9b02797
日期:2020.1.17
A palladium-catalyzed alkenylation involving remote δ-position C(alkenyl)-H activation of cycloalkenes reacting with electron-deficient alkenes is described. This method features excellent site selectivity and stereoselectivity to efficiently afford only E-selective highly substituted 1,3-diene derivatives with extra-ligand-free and good functional group tolerance including estrone and free N-H tryptamine
Iridium-Catalyzed Cycloisomerization of <i>N</i>-Tethered 1,7-Enynes: Construction of an Azabicyclo[5.1.0]octene System
作者:Sheng Zhao、Zhong-Lin Zang、Siyu Li、Xumei Wen、Chenhui Wang、Jian Guo、Yun He
DOI:10.1021/acs.joc.0c00516
日期:2020.7.17
An efficient method for the synthesis of azabicyclo[5.1.0]octenes through cycloisomerization of nitrogen-tethered 1,7-enynes catalyzed by [IrCp*Cl2]2 was developed. With appropriately designed substrates, this method could be easily employed to generate complex fused ringsystems such as [6-6-3-7], [5-6-3-7], [7-6-3-7], and [8-6-3-7] ringsystems, which enriches the diversity of the cyclopropane-fused
Ligand‐Controlled, Tunable Copper‐Catalyzed Radical Divergent Trifluoromethylation of Unactivated Cycloalkenes
作者:Qi Wang、Zhong‐Lin Zang、Mi Jie、Li‐Hua Luo、Dan Yang、Cheng‐He Zhou、Gui‐Xin Cai
DOI:10.1002/adsc.202101016
日期:2021.12.7
The Cu-catalyzed high-chemoselective trifluoromethylation reactions of unactivated cycloalkenes via the modulation of appropriate ligands have been explored. The Cu(I)/appropriate ligands-catalytic systems overcome the key challenge in differentiating two pathways involving radical intermediates and provide a ligand-controlled approach for site-specific spiro-aryltrifluoromethylation and chlorotrifluoromethylation
已经探索了通过调节合适的配体对未活化的环烯烃进行 Cu 催化的高化学选择性三氟甲基化反应。Cu(I)/适当的配体催化系统克服了区分涉及自由基中间体的两条途径的关键挑战,并为位点特异性螺芳基三氟甲基化和氯三氟甲基化提供了一种配体控制的方法,以提供三氟甲基化的螺四氢喹啉化合物和邻位含氯的化合物三氟甲基环烷烃。此外,与报道的氯源相比,1,2-二氯乙烷被用作三氟氯甲基化的更绿色、更经济的原料。