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Sukowski V, van Borselen M, Mathew S, de Bruin B, Fernández-Ibáñez MÁ. meta-C-H Arylation of Aniline Derivatives via Palladium/ S,O-Ligand/Norbornene Cooperative Catalysis. Angew Chem Int Ed Engl 2023:e202317741. [PMID: 38079090 DOI: 10.1002/anie.202317741] [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: 11/21/2023] [Indexed: 12/23/2023]
Abstract
Aromatic amines are ubiquitous moieties in organic molecules and their direct functionalization is of great interest in many research areas due to their prevalence in pharmaceuticals and organic electronics. While several synthetic tools exist for the ortho- and para-functionalization of anilines, the functionalization of the less reactive meta-position is not easy to achieve with current methods. To date, the meta-C-H arylation of aniline derivatives has been restricted to either the use of directing groups & templates, or their transformation into anilides & quaternary anilinium salts. Herein, we report the first general and efficient meta-C-H-arylation of non-directed aniline derivatives via cooperative catalysis with a palladium-S,O-ligand-norbornene system. The reaction proceeds under mild conditions with a wide range of aniline derivatives and aryl iodides, while being operationally simple and scalable. Our preliminary mechanistic investigation-including the isolation of several palladium complexes and deuterium experiments-reveal useful insights into the substituent-effects of both the aniline-substrate and the norbornene-mediator during the meta-C-H activation step.
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Affiliation(s)
- Verena Sukowski
- Van't Hoff Institute for Molecular Sciences, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Manuela van Borselen
- Van't Hoff Institute for Molecular Sciences, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Simon Mathew
- Van't Hoff Institute for Molecular Sciences, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Bas de Bruin
- Van't Hoff Institute for Molecular Sciences, Science Park 904, 1098 XH, Amsterdam, The Netherlands
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Gültekin DD, Daştan A, Taşkesenligil Y, Kazaz C, Zorlu Y, Balci M. Bromination of endo-7-norbornene derivatives revisited: failure of a computational NMR method in elucidating the configuration of an organic structure. Beilstein J Org Chem 2023; 19:764-770. [PMID: 37284587 PMCID: PMC10241099 DOI: 10.3762/bjoc.19.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 05/23/2023] [Indexed: 06/08/2023] Open
Abstract
Previously we reported on the bromination of endo-7-bromonorbornene at different temperatures yielding mixtures of addition products. The structural elucidations of the formed compounds were achieved by NMR spectroscopy. Particularly, the γ-gauche effect and long-range couplings were instrumental in assigning the stereochemistry of the adducts. However, in a recent paper, Novitskiy and Kutateladze claimed that based on an applied machine learning-augmented DFT method for computational NMR that the structure of the product, (1R,2R,3S,4S,7s)-2,3,7-tribromobicyclo[2.2.1]heptane was wrong. With the aid of their computational method, they revised a number of published structures, including ours, and assigned our product the structure (1R,2S,3R,4S,7r)-2,3,7-tribromobicyclo[2.2.1]heptane. To fit their revised structure, they proposed an alternative mechanism featuring a skeletal rearrangement without the intermediacy of a carbocation. Herein, we are not only confirming the structure originally assigned by us through crucial NMR experiments, we also present the ultimate structural proof by means of X-ray crystallography. Moreover, we disprove the mechanism proposed by the aforementioned authors based on sound mechanistic reasoning and point to an oversight by the authors that led them to an erroneous mechanistic pathway.
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Affiliation(s)
- Demet Demirci Gültekin
- Askale Vocational College, Department of Metallurgical Program, Atatürk University 25500 Erzurum, Turkey
| | - Arif Daştan
- Department of Chemistry, Atatürk University, 25240 Erzurum, Turkey
| | | | - Cavit Kazaz
- Department of Chemistry, Atatürk University, 25240 Erzurum, Turkey
| | - Yunus Zorlu
- Department of Chemistry, Gebze Technical University, 41400, Gebze, Turkey
| | - Metin Balci
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
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3
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Wang Z, Li Y, Han X, Zhang D, Hou H, Xiao L, Li G. Kalihiacyloxyamides A-H, α-acyloxy amide substituted kalihinane diterpenes isolated from the sponge Acanthella cavernosa collected in the South China Sea. PHYTOCHEMISTRY 2023; 206:113512. [PMID: 36503704 DOI: 10.1016/j.phytochem.2022.113512] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 11/07/2022] [Accepted: 11/08/2022] [Indexed: 06/17/2023]
Abstract
Eight unreported α-acyloxy amide substituted kalihinane diterpenes, named kalihiacyloxyamides A-H were isolated from the South China Sea sponge Acanthella cavernosa. The planar structures and absolute configurations were elucidated by detailed 1D and 2D NMR experiments along with HRESIMS analysis, single crystal X-ray diffraction and CD spectroscopic analysis. Two compounds showed significant cytotoxicity against K562 cell line with IC50 values of 6.4 and 6.3 μM, while two other compounds displayed moderate cytotoxicity against MDA-MB-231 with IC50 values of 7.3 and 7.9 μM.
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Affiliation(s)
- Zhe Wang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China; Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, People's Republic of China
| | - Yueying Li
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Xiao Han
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China; Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, People's Republic of China
| | - Di Zhang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China; Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, People's Republic of China
| | - Huiyue Hou
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China; Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, People's Republic of China
| | - Li Xiao
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China; Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, People's Republic of China
| | - Guoqiang Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China; Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, People's Republic of China.
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4
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Novitskiy IM, Kutateladze AG. Peculiar Reaction Products and Mechanisms Revisited with Machine Learning-Augmented Computational NMR. J Org Chem 2022; 87:8589-8598. [PMID: 35723522 DOI: 10.1021/acs.joc.2c00749] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
DU8ML, a fast and accurate machine learning-augmented density functional theory (DFT) method for computing nuclear magnetic resonance (NMR) spectra, proved effective for high-throughput revision of misassigned natural products. In this paper, we disclose another important aspect of its application: correction of unusual reaction mechanisms originally proposed because of incorrect product structures.
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Affiliation(s)
- Ivan M Novitskiy
- Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, United States
| | - Andrei G Kutateladze
- Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, United States
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Remete AM, Novák TT, Nonn M, Haukka M, Fülöp F, Kiss L. Synthesis of novel fluorinated building blocks via halofluorination and related reactions. Beilstein J Org Chem 2020; 16:2562-2575. [PMID: 33133288 PMCID: PMC7590628 DOI: 10.3762/bjoc.16.208] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 10/06/2020] [Indexed: 12/25/2022] Open
Abstract
A study exploring halofluorination and fluoroselenation of some cyclic olefins, such as diesters, imides, and lactams with varied functionalization patterns and different structural architectures is described. The synthetic methodologies were based on electrophilic activation through halonium ions of the ring olefin bonds, followed by nucleophilic fluorination with Deoxo-Fluor®. The fluorine-containing products thus obtained were subjected to elimination reactions, yielding various fluorine-containing small-molecular entities.
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Affiliation(s)
- Attila Márió Remete
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary.,Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary
| | - Tamás T Novák
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary
| | - Melinda Nonn
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary.,Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary.,MTA-SZTE Stereochemistry Research Group, Hungarian Academy of Sciences, H-6720 Szeged, Eötvös u. 6, Hungary
| | - Matti Haukka
- Department of Chemistry, University of Jyväskylä, FIN-40014, Jyväskylä, Finland
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary.,Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary.,MTA-SZTE Stereochemistry Research Group, Hungarian Academy of Sciences, H-6720 Szeged, Eötvös u. 6, Hungary
| | - Loránd Kiss
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary.,Interdisciplinary Excellence Centre, Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary
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6
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Li Z, Zheng J, Li C, Wu W, Jiang H. Palladium-Catalyzed Three-Component Coupling Reaction of Allyl Carboxylates, Norbornenes and Diboronates Involving Sequential Olefins Insertion and Borylation Reaction. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201800536] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zun Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou Guangdong 510640 China
| | - Jia Zheng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou Guangdong 510640 China
| | - Chunsheng Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou Guangdong 510640 China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou Guangdong 510640 China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou Guangdong 510640 China
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Essiz S, Dalkilic E, Sari O, Dastan A, Balci M. Unexpected regioselectivity observed in the bromination and epoxidation reactions of p-benzoquinone-fused norbornadiene: An experimental and computational study. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Stereo- and regioselective halogenation of norbornenes directed by neighboring group participation. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.10.105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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da Costa Resende G, Alvarenga ES. Structural elucidation of dioxa-cage compounds from tetrahydroisobenzofuran-1(3H)-one: analysis of NMR data and GIAO chemical shifts calculations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:968-974. [PMID: 27391981 DOI: 10.1002/mrc.4483] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 06/20/2016] [Accepted: 07/04/2016] [Indexed: 06/06/2023]
Abstract
The polycyclic compounds, especially the dioxa-cages, have attracted considerable attention in recent years. In our work, a series of 9β-substituted 3-oxo-4,11-dioxatetracyclo[5.2.1.15,8 .02,6 ]undecane compounds were unexpectedly isolated during bromination, chlorination and epoxidation reactions of the 3-hydroxy-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one. After careful analysis of the NMR data, the chemical shifts of the isolated and the expected products were predicted by theoretical calculations using density functional theory and gauge including atomic orbitals. The best correlation between calculated and experimental data was evaluated by comparing mean absolute errors and applying DP4 probability methodology. Results from both approaches indicated a correct structural elucidation. Copyright © 2016 John Wiley & Sons, Ltd.
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Teixeira MG, Alvarenga ES. Characterization of novel isobenzofuranones by DFT calculations and 2D NMR analysis. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:623-631. [PMID: 26811211 DOI: 10.1002/mrc.4411] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 12/23/2015] [Accepted: 12/29/2015] [Indexed: 06/05/2023]
Abstract
Phthalides are frequently found in naturally occurring substances and exhibit a broad spectrum of biological activities. In the search for compounds with insecticidal activity, phthalides have been used as versatile building blocks for the syntheses of novel potential agrochemicals. In our work, the Diels-Alder reaction between furan-2(5H)-one and cyclopentadiene was used successfully to obtain (3aR,4S,7R,7aS)-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one and (3aS,4R,7S,7aR)-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one (2) and (3aS,4S,7R,7aR)-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one and (3aR,4R,7S,7aS)-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one (3). The endo adduct (2) was brominated to afford (3aR,4R,5R,7R,7aS,8R)-5,8-dibromohexahydro-4,7-methanoisobenzofuran-1(3H)-one and (3aS,4S,5S,7S,7aR,8S)-5,8-dibromohexahydro-4,7-methanoisobenzofuran-1(3H)-one (4) and (3aS,4R,5R,6S,7S,7aR)-5,6-dibromohexahydro-4,7-methanoisobenzofuran-1(3H)-one and (3aR,4S,5S,6R,7R,7aS)-5,6-dibromohexahydro-4,7-methanoisobenzofuran-1(3H)-one (5). Following the initial analysis of the NMR spectra and the proposed two novel unforeseen products, we have decided to fully analyze the classical and non-classical assay structures with the aid of computational calculations. Computation to predict the (13) C and (1) H chemical shifts for mean absolute error analyses have been carried out by gauge-including atomic orbital method at M06-2X/6-31+G(d,p) and B3LYP/6-311+G(2d,p) levels of theory for all viable conformers. Characterization of the novel unforeseen compounds (4) and (5) were not possible by employing only the experimental NMR data; however, a more conclusive structural identification was performed by comparing the experimental and theoretical (1) H and (13) C chemical shifts by mean absolute error and DP4 probability analyses. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Milena G Teixeira
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG, 36571-900, Brazil
| | - Elson S Alvarenga
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG, 36571-900, Brazil
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Xu Y, Lang JH, Jiao WH, Wang RP, Peng Y, Song SJ, Zhang BH, Lin HW. Formamido-diterpenes from the South China Sea sponge Acanthella cavernosa. Mar Drugs 2012; 10:1445-1458. [PMID: 22851918 PMCID: PMC3407923 DOI: 10.3390/md10071445] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 06/01/2012] [Accepted: 06/16/2012] [Indexed: 11/16/2022] Open
Abstract
Seven new formamido-diterpenes, cavernenes A–D (1–4), kalihinenes E and F (5–6), and kalihipyran C (7), together with five known compounds (8–12), were isolated from the South China Sea sponge Acanthella cavernosa. Structures were established using IR, HRESIMS, 1D and 2D NMR, and single X-ray diffraction techniques. The isolated compounds were assessed for their cytotoxicity against a small panel of human cancer cell lines (HCT-116, A549, HeLa, QGY-7701, and MDA-MB-231) with IC50 values in the range of 6–18 μM. In addition, compound 9 showed weak antifungal activity against Trichophyton rubrum and Microsporum gypseum with MIC values of 8 and 32 μg/mL, respectively, compound 10 displayed weak antifungal activity against fungi Candida albicans, Cryptococcus neoformans, T. rubrum, and M. gypseum with MIC values of 8, 8, 4, and 8 μg/mL, respectively.
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Affiliation(s)
- Ying Xu
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China; (Y.X.); (J.-H.L.); (W.-H.J.); (R.-P.W.)
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China;
| | - Jun-Hui Lang
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China; (Y.X.); (J.-H.L.); (W.-H.J.); (R.-P.W.)
| | - Wei-Hua Jiao
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China; (Y.X.); (J.-H.L.); (W.-H.J.); (R.-P.W.)
| | - Ru-Ping Wang
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China; (Y.X.); (J.-H.L.); (W.-H.J.); (R.-P.W.)
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China;
| | - Ying Peng
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China;
| | - Shao-Jiang Song
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China;
- Authors to whom correspondence should be addressed; (S.-J.S.); (B.-H.Z.); (H.-W.L.); Tel./Fax: +86-24-23986510 (S.-J.S.); +86-21-81875272 (B.-H.Z.); +86-21-65585154 (H.-W.L.)
| | - Bao-Hua Zhang
- Eastern Hepatobiliary Surgical Hospital, Second Military Medical University, Shanghai 200438, China
- Authors to whom correspondence should be addressed; (S.-J.S.); (B.-H.Z.); (H.-W.L.); Tel./Fax: +86-24-23986510 (S.-J.S.); +86-21-81875272 (B.-H.Z.); +86-21-65585154 (H.-W.L.)
| | - Hou-Wen Lin
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China; (Y.X.); (J.-H.L.); (W.-H.J.); (R.-P.W.)
- Authors to whom correspondence should be addressed; (S.-J.S.); (B.-H.Z.); (H.-W.L.); Tel./Fax: +86-24-23986510 (S.-J.S.); +86-21-81875272 (B.-H.Z.); +86-21-65585154 (H.-W.L.)
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13
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Liu H, Chen C, Wang L, Tong X. Pd(0)-Catalyzed Iodoalkynation of Norbornene Scaffolds: The Remarkable Solvent Effect on Reaction Pathway. Org Lett 2011; 13:5072-5. [DOI: 10.1021/ol2022388] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hui Liu
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Chen Chen
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Limin Wang
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Xiaofeng Tong
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
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Li Y, Liu X, Jiang H, Liu B, Chen Z, Zhou P. Palladium-Catalyzed Bromoalkynylation of CC Double Bonds: Ring-Structure-Dependent Synthesis of 7-Alkynyl Norbornanes and Cyclobutenyl Halides. Angew Chem Int Ed Engl 2011; 50:6341-5. [DOI: 10.1002/anie.201100002] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2011] [Revised: 04/21/2011] [Indexed: 11/06/2022]
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15
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Li Y, Liu X, Jiang H, Liu B, Chen Z, Zhou P. Palladium-Catalyzed Bromoalkynylation of CC Double Bonds: Ring-Structure-Dependent Synthesis of 7-Alkynyl Norbornanes and Cyclobutenyl Halides. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Nişanci B, Dalkiliç E, Güney M, Daştan A. Synthesis and Diels-Alder cycloaddition reaction of norbornadiene and benzonorbornadiene dimers. Beilstein J Org Chem 2009; 5:39. [PMID: 19777139 PMCID: PMC2748719 DOI: 10.3762/bjoc.5.39] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2009] [Accepted: 08/07/2009] [Indexed: 11/23/2022] Open
Abstract
Dimeric forms of norbornadiene and benzonorbornadiene were synthesized starting with known monobromide derivatives. The Diels–Alder cycloaddition reaction of dimers with TCNE and PTAD was investigated and new norbornenoid polycyclics were obtained. All compounds were characterized properly using NMR spectroscopy.
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Affiliation(s)
- Bilal Nişanci
- Atatürk University, Faculty of Science, Department of Chemistry, 25240 Erzurum-TURKEY
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Şengül ME, Gültekin DD, Eşsiz S, Şahin E, Daştan A. The first and efficient synthesis of some of the polyhalogenated benzobarrelenes: unusual formation of a benzosemibullvalene derivative. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.04.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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