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Li G, Luo D, Luo Q, Huang Z, Zhuang W, Luo H, Yang W. Chemoselectivity of the CuAAC/Ring Cleavage/Cyclization Reaction between Enaminones and α-Acylketenimine. J Org Chem 2024; 89:2190-2199. [PMID: 38279922 DOI: 10.1021/acs.joc.3c02095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2024]
Abstract
Ketenimines represent an important class of reactive species, useful synthetic intermediates, and synthons. However, in general, ketenimines preferentially undergoes nucleophilic addition reactions with hydroxyl and amino groups, and carbon functional groups remain a less studied subset of such systems. Herein, we develop a straightforward syntheses of pyridin-4(1H)-imines that is achieved by cyclization of a reacting enaminone unit with α-acylketenimine which is generated from the reactions of sulfonyl azides and terminal ynones in situ (CuAAC/Ring cleavage reaction). The cascade process preferentially starts with the nucleophilic α-C of the enaminone unit instead of an amino group, attacking the electron-deficient central carbon of ketenimine, and the chemoselectivity unconventional products pyridin-4(1H)-imines were formed by intramolecular cyclization.
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Affiliation(s)
- Guanrong Li
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Danyang Luo
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Qiaoli Luo
- School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang 524048, P. R. China
| | - Zixin Huang
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Weimin Zhuang
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Hui Luo
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Weiguang Yang
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
- The Marine Biomedical Research Institute of Guangdong, Zhanjiang, Guangdong 524023, China
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Bai PB, Durie A, Wang GW, Larrosa I. Unlocking regioselective meta-alkylation with epoxides and oxetanes via dynamic kinetic catalyst control. Nat Commun 2024; 15:31. [PMID: 38167324 PMCID: PMC10761682 DOI: 10.1038/s41467-023-44219-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 12/05/2023] [Indexed: 01/05/2024] Open
Abstract
Regioselective arene C-H bond alkylation is a powerful tool in synthetic chemistry, yet subject to many challenges. Herein, we report the meta-C-H bond alkylation of aromatics bearing N-directing groups using (hetero)aromatic epoxides as alkylating agents. This method results in complete regioselectivity on both the arene as well as the epoxide coupling partners, cleaving exclusively the benzylic C-O bond. Oxetanes, which are normally unreactive, also participate as alkylating reagents under the reaction conditions. Our mechanistic studies reveal an unexpected reversible epoxide ring opening process undergoing catalyst-controlled regioselection, as key for the observed high regioselectivities.
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Affiliation(s)
- Peng-Bo Bai
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Alastair Durie
- School of Natural Sciences, Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Gang-Wei Wang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
| | - Igor Larrosa
- School of Natural Sciences, Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.
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Yang W, Luo D, Li G, Luo Q, Banwell MG, Chen L. Synthesis of Pyridin-1(2 H)-ylacrylates and the Effects of Different Functional Groups on Their Fluorescence. Molecules 2023; 28:6511. [PMID: 37764287 PMCID: PMC10536652 DOI: 10.3390/molecules28186511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 08/25/2023] [Accepted: 09/01/2023] [Indexed: 09/29/2023] Open
Abstract
While fluorescent organic materials have many potential as well as proven applications and so have attracted significant attention, pyridine-olefin conjugates remain a less studied subset of such systems. Herein, therefore, we report on the development of the straightforward syntheses of pyridin-1(2H)-ylacrylates and the outcomes of a study of the effects of substituents on their fluorescent properties. Such compounds were prepared using a simple, metal-free and three-component coupling reaction involving 2-aminopyridines, sulfonyl azides and propiolates. The fluorescent properties of the ensuing products are significantly affected by the positions of substituents on the cyclic framework, with those located in central positions having the greatest impact. Electron-withdrawing groups tend to induce blue shifts while electron-donating ones cause red shifts. This work highlights the capacity that the micro-modification of fluorescent materials provides for fine-tuning their properties such that they may be usefully applied to, for example, the study of luminescent materials.
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Affiliation(s)
- Weiguang Yang
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang 524023, China; (D.L.); (G.L.)
| | - Danyang Luo
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang 524023, China; (D.L.); (G.L.)
| | - Guanrong Li
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang 524023, China; (D.L.); (G.L.)
| | - Qiaoli Luo
- School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang 524048, China;
| | - Martin G. Banwell
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang 524023, China; (D.L.); (G.L.)
- Institute for Advanced and Applied Chemical Synthesis (IAACS), Jinan University, Guangzhou 510632, China
| | - Lanmei Chen
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang 524023, China; (D.L.); (G.L.)
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He Y, Yang Z, Luo D, Luo X, Chen X, Yang W. An Oxidant-Free and Mild Strategy for Quinazolin-4(3 H)-One Synthesis via CuAAC/Ring Cleavage Reaction. Molecules 2023; 28:5734. [PMID: 37570705 PMCID: PMC10420183 DOI: 10.3390/molecules28155734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/21/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
An oxidant-free and highly efficient synthesis of phenolic quinazolin-4(3H)-ones was achieved by simply stirring a mixture of 2-aminobenzamides, sulfonyl azides, and terminal alkynes. The intermediate N-sulfonylketenimine underwent two nucleophilic additions and the sulfonyl group eliminated through the power of aromatization. The natural product 2-(4-hydroxybenzyl)quinazolin-4(3H)-one can be synthesized on a large scale under mild conditions with this method.
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Affiliation(s)
- Yueling He
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Guangdong Medical University, Zhanjiang 524023, China; (Y.H.); (Z.Y.); (D.L.)
- School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
| | - Zhongtao Yang
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Guangdong Medical University, Zhanjiang 524023, China; (Y.H.); (Z.Y.); (D.L.)
| | - Danyang Luo
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Guangdong Medical University, Zhanjiang 524023, China; (Y.H.); (Z.Y.); (D.L.)
| | - Xiai Luo
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Guangdong Medical University, Zhanjiang 524023, China; (Y.H.); (Z.Y.); (D.L.)
- Hunan Province Key Laboratory for Synthetic Biology of Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China
| | - Xiaodong Chen
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524023, China
| | - Weiguang Yang
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Guangdong Medical University, Zhanjiang 524023, China; (Y.H.); (Z.Y.); (D.L.)
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524023, China
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Yang W, Luo D, Li G, Hu W, Zheng J, Chen L. Mild and efficient synthesis of benzothiazolopyrimidine derivatives via CuAAC/ring cleavage/cyclization reaction. RSC Adv 2023; 13:22966-22972. [PMID: 37520094 PMCID: PMC10377972 DOI: 10.1039/d3ra04082h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 07/24/2023] [Indexed: 08/01/2023] Open
Abstract
An operationally mild and efficient synthesis of benzothiazolopyrimidine is achieved by a three-component reaction of 2-aminebenzo[d]thiazoles, sulfonyl azides and terminal ynones. This cascade process involved a CuAAC/ring cleavage/cyclization reaction. Particularly, most of the benzothiazolopyrimidine derivatives could be isolated by filtration without further purification.
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Affiliation(s)
- Weiguang Yang
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University Zhanjiang 524023 China
- GuangDong Engineering Technology Research Center for the Development and Utilization of Mangrove Wetland Medicinal Resources, The Marine Biomedical Research Institute of Guangdong Zhanjiang Zhanjiang Guangdong 524023 China
| | - Danyang Luo
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University Zhanjiang 524023 China
| | - Guanrong Li
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University Zhanjiang 524023 China
| | - Weigao Hu
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University Zhanjiang 524023 China
| | - Jia Zheng
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University Zhanjiang 524023 China
| | - Lanmei Chen
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, The Marine Biomedical Research Institute, Guangdong Medical University Zhanjiang 524023 China
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