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671 results on '"Wang, Xi-Cun"'

159. Synthesis of stilbene derivatives via visible-light-induced cross-coupling of aryl diazonium salts with nitroalkenes using –NO2 as a leaving group.

Author

Zhang, Na, Quan, Zheng-Jun, Zhang, Zhang, Da, Yu-Xia, and Wang, Xi-Cun

Subjects
STILBENE derivatives, COUPLING reactions (Chemistry), DIAZONIUM compounds
Abstract

The straightforward visible-light-induced synthesis of stilbene compounds via the cross-coupling of nitroalkenes and diazonium tetrafluoroborates under transition-metal-free conditions is described. The protocol uses green LEDs as light sources and eosin Y as an organophotoredox catalyst. Broad substrate scope and exclusive selectivity for the (E)-configuration of stilbenes are observed. This protocol proceeds via a radical pathway, with nitroalkenes serving as the radical acceptor, and the nitro group is cleaved during the process. [ABSTRACT FROM AUTHOR]

Published
2016
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160. Nickel-catalyzed.

Author

Gong, Hai ‐ Peng, Quan, Zheng ‐ Jun, and Wang, Xi ‐ Cun

Subjects
NICKEL catalysts, PYRIMIDINE derivatives, INDOLE, BENZIMIDAZOLES, NUCLEOPHILES
Abstract

Nickel-catalyzed of pyrimidin-2-yl tosylates with indole and benzimidazole was achieved using Ni(dppp)Cl2 as catalyst, yielding a variety of novel C2-substituted pyrimidine derivatives in good yields. This reaction proved to be tolerant of various pyrimidin-2-yl tosylates bearing either electron-donating or electron-withdrawing groups as well as nucleophiles including indole, benzimidazole and 1,2,4-triazole. Copyright © 2016 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2016
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197. Template Synthesis to Solve the Unreachable OrthoC–H Functionalization Reaction of Aryl Iodide

Author

Zhang, Bo-Sheng, Jia, Wan-Yuan, Wang, Yi-Ming, Oliveira, João C. A., Warratz, Svenja, Zhang, Ze-Qiang, Gou, Xue-Ya, Liang, Yong-Min, Wang, Xi-Cun, Quan, Zheng-Jun, and Ackermann, Lutz

Abstract

This report describes the use of a simple Pd/NBE catalytic system to achieve orthoC–H oxylation and phosphonylation and other functionalizations of aryl iodide through templated conversion reactions. Dimethylamine is introduced in the ortho-site of aryl iodide through C–H amination, and aryl dimethylamine is quickly converted to methyl quaternary ammonium salt precipitation. Methyl quaternary ammonium salt avoids Hofmann elimination in subsequent functionalization. This method solves various orthofunctionalization reactions of aryl iodide that have not been achieved for a long time in the field of Pd/NBE chemistry indirectly.

Published
2023
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198. Redox Neutral Radical-Relay Nickel-Catalyzed Remote Carbonylation

Author

Li, Ming, Gao, Fan, Miao, Dong-Yu, Chen, Dong-ping, Li, Shun-Xi, Qiu, Yi-Feng, Quan, Zheng-Jun, Wang, Xi-Cun, and Liang, Yong-Min

Abstract

A novel and efficient method for the catalytic installation of a carbonyl group via remote radical coupling is disclosed. The nickel-catalyzed reaction proceeds to undergo a sequential single-electron transfer, 1,5-hydrogen atom transfer, and carbonyl insertion, thus providing the α-substituted ketone. Further, this reaction could be carried out smoothly under normal pressure and redox-neutral conditions, and demonstrated functional-group compatibility and excellent site-selectivity.

Published
2023
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199. Synthesis of C4-Aminated Carbazoles and Their Derivatives via Pd/NBE Chemistry

Author

Zhang, Bo-Sheng, Zhao, Sheng-Yan, Li, Shun-Xi, Jia, Wan-Yuan, Yang, Yu-Xi, Wang, Yi-Ming, Gou, Xue-Ya, Liang, Yong-Min, Wang, Xi-Cun, and Quan, Zheng-Jun

Abstract

Carbazole, as one of the most important organic frameworks, has been used in optoelectronic materials and biochemistry. However, the synthesis of C4-substituted carbazole has always been an unsolved problem. This report describes the one-step synthesis of C4-aminated carbazoles and their derivatives through the series reaction of C–H amination and arylation. The substrate scope is wide. C4-Amino carbazoles substituted by C2, C6, C7, and C8 methyl groups, especially carbazole derivatives of fused rings, pyridine, and dibenzofuran, can be synthesized.

Published
2023
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