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
Palladium‐Catalyzed Remote
<i>δ</i>
‐C−H Selenylation of Arylethylamide and Alkenylethylamide Derivatives
作者:Wenbo Ma、Yunhao Zhou、Yang Wang、Bo Li、Tao Zheng、Zemin Cheng、Ruhuai Mei
DOI:10.1002/adsc.202200691
日期:2022.10.18
A palladium-catalyzed remote δ-C−H selenylation of arylethylamidederivatives with readily available diselenides has been reported. This protocol relies on the use of a removable picolinamide directing group to access unsymmetrical diaryl selenides in 45–98% yields. Furthermore, the inactivated δ-C(alkenyl)−H bond was also compatible in this reaction and afforded the thermo-dynamically unfavorable
Cobalt-catalyzed C–H activation and isocyanide insertion of tryptamine derivatives
作者:Yiwen Zhu、Jing Wang、Jun Ying、Xiao-Feng Wu
DOI:10.1016/j.tet.2023.133551
日期:2023.8
tryptamine derivatives has been developed for the construction of indole-2-carboxamide scaffolds. By using Co(OAc)2·4H2O as the non-noble catalyst, the reaction worked well to give various indole-2-carboxamides in moderate to high yields. Furthermore, the mechanistic experiments indicated that the Co(III) species was the active catalyst in a non-radical reaction pathway. Notably, silversalt as the oxidant
Pd-Catalyzed Picolinamide-Directed Late-Stage Chalcogenation of Tryptophan-Containing Peptides
作者:Raghunath Bag、Nagendra K. Sharma
DOI:10.1021/acs.joc.3c01657
日期:2023.11.17
chalcogenation of tryptophan-containingpeptides with disulfides/diselenides in moderate to good yields. It comprises broad substrate scope, functional group diversity, late-stage modification of drug molecules, and various valuable synthetic transformations, including room temperature easy removal of the picolinamide auxiliary, which could be applicable to tune the structure and function of peptides.