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
Catalytic Multisite-Selective Acetoxylation Reactions at sp<sup>2</sup> vs sp<sup>3</sup> C–H Bonds in Cyclic Olefins
作者:Zhong-Lin Zang、Sheng Zhao、Shuklachary Karnakanti、Cheng-Lin Liu、Pan-Lin Shao、Yun He
DOI:10.1021/acs.orglett.6b02458
日期:2016.10.7
The first Pd-catalyzed multisite-selective acetoxylation reactions are disclosed at an unactivated alkene sp2 C–H bond versus secondary allylic sp3 C–H bond in cyclic olefins via the modulation of directing groups. The different directing groups overcome the key challenge in differentiating C–H bonds and provide a new controlling approach for site-specific C–H activation. A wide variety of substrates
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。
Sorm; Beranek, Chemicke Listy, 1953, vol. 47, p. 708,710