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164 results on '"Zhu, Yingguang"'

8. Visible Light‐Induced Benzylic C(sp3)−C(sp2) Defluorinative Coupling between Indole Derivatives and Polyfluoroarenes.

Author

Li, Yan, Tong, He, Li, Yukun, Chen, Kang, and Zhu, Yingguang

Subjects
CHARGE exchange, FUNCTIONAL groups, SCISSION (Chemistry), INDOLE, INDOLE derivatives
Abstract

A visible light‐induced transition metal‐free benzylic C(sp3)−C(sp2) defluorinative coupling between indole derivatives and polyfluoroarenes via the sequential electron transfer‐proton transfer (ET/PT) process has been developed, affording various polyfluorinated diarylmethanes. This protocol features mild conditions and good functional group tolerance. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Transition‐Metal‐Free Visible Light‐Induced Imino‐trifluoromethylation of Unsaturated Oxime Esters: A Facile Access to CF3‐Tethered Pyrrolines.

Author

Chen, Bin, He, Han, Xu, Jiawei, Guo, Kang, Xu, Ning, Chen, Kang, and Zhu, Yingguang

Subjects
ESTERS, RHODAMINE B, ORGANIC synthesis, CATALYSIS
Abstract

A novel transition‐metal‐free iminotrifluoromethylation of unsaturated oxime esters has been achieved through Rhodamine B photoredox catalysis under mild conditions. This methodology provides facile access to various CF3‐tethered pyrroline derivatives in high efficiency. The gram‐scale reaction demonstrates the potential value of this protocol in organic synthesis. [ABSTRACT FROM AUTHOR]

Published
2021
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26. Visible‐Light Photoredox‐Catalyzed Tandem Trifluoro‐methylation/Cyclization/Remote Oxidation of 1,6‐Dienes: Access to CF3‐Containing Five‐Membered Heterocycles.

Author

Chun, Jianlin, Zhang, Honglin, Meng, Fei, Guo, Kang, Cao, Shujun, Fang, Qin, Li, Jie, and Zhu, Yingguang

Subjects
OXIDATION, HETEROCYCLIC compounds, RING formation (Chemistry), ALKENES, OXIDIZING agents
Abstract

A visible‐light photoredox‐catalyzed tandem trifluoromethylation/cyclization/remote oxidation of 1,6‐dienes has been achieved. A broad range of trifluoromethyl group‐containing tetrahydrofurans or tetrahydropyrroles could be generated in good yields and with excellent diastereoselectivity by using dimethyl sulfoxide (DMSO) as the oxidant. The mild and facile protocol affords direct access to trifluoromethyl group‐bearing tetrahydrofurans and tetrahydropyrroles via difunctionalization of olefins. [ABSTRACT FROM AUTHOR]

Published
2021
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27. Transition‐Metal‐Free Visible Light‐Induced Imino‐trifluoromethylation of Unsaturated Oxime Esters: A Facile Access to CF3‐Tethered Pyrrolines

Author

Chen, Bin, He, Han, Xu, Jiawei, Guo, Kang, Xu, Ning, Chen, Kang, and Zhu, Yingguang

Abstract

A novel transition‐metal‐free iminotrifluoromethylation of unsaturated oxime esters has been achieved through Rhodamine B photoredox catalysis under mild conditions. This methodology provides facile access to various CF3‐tethered pyrroline derivatives in high efficiency. The gram‐scale reaction demonstrates the potential value of this protocol in organic synthesis. The first example of iminotrifluoromethylation of unsaturated oxime esterswas achieved through Rhodamine B catalysis under transition‐metal‐free conditions. This transformation provides facile access to CF3‐tethered pyrrolidines under mild conditions.

Published
2021
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28. Copper-Catalyzed Domino Cyclization/Trifluoromethylthiolation of Unactivated Alkenes: Access to SCF3-Containing Pyrrolines

Author

Guo, Kang, Zhang, Honglin, Cao, Shujun, Gu, Chen, Zhou, Huating, Li, Jie, and Zhu, Yingguang

Abstract

A novel and efficient copper-catalyzed cascade cyclization/trifluoromethylthiolation of unactivated olefins has been achieved with the stable and readily available AgSCF3as the SCF3source. A range of SCF3-substituted pyrrolines have been easily obtained under mild conditions in good yields via the present process. This method represents a facile and rapid access to valuable pyrrolines with fluorine-containing groups, and it is amenable to gram-scale synthesis.

Published
2024
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29. Access to Cyano-Containing Isoxazolines via Copper-Catalyzed Domino Cyclization/Cyanation of Alkenyl Oximes

Author

Meng, Fei, Zhang, Honglin, Guo, Kang, Dong, Jiayue, Lu, Ai-Min, and Zhu, Yingguang

Abstract

A highly efficient copper-catalyzed cyclization/cyanation cascade of unactivated olefins bearing oximes is described. A variety of cyano-containing isoxazolines have been obtained in high yields with cheap Cu(NO3)2·3H2O as the catalyst and TMSCN as the non-metallic cyanide source. The present method provides a mild, simple, and practical access to cyano-substituted isoxazolines and is amenable to gram scale. The simultaneous construction of C(sp3)–CN and C–O bonds can be achieved in one step.

Published
2024
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30. Copper‐Catalyzed Domino Cyclization/Thiocyanation of Unactivated Olefins: Access to SCN‐Containing Pyrazolines.

Author

Meng, Fei, Zhang, Honglin, He, Han, Xu, Ning, Fang, Qin, Guo, Kang, Cao, Shujun, Shi, Yun, and Zhu, Yingguang

Subjects
ALKENES, HYDRAZONES, CATALYSIS
Abstract

A mild and highly efficient Cu‐catalyzed cascade cyclization/thiocyanation of unactivated alkenes bearing hydrazones has been developed. A broad range of SCN‐substituted pyrazolines have been readily obtained in good to excellent yields with commercially available and very cheap Cu(acac)2 and NH4SCN. This present method provides a rapid, facile, and practical access to valuable pyrazolines with the important SCN functionality, and it is amenable to the gram scale. [ABSTRACT FROM AUTHOR]

Published
2020
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