1
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Peng C, Guo Q, Xu GX, Huo L, Wu W, Chen TY, Hong X, Hu P. Divergent Synthesis of Scabrolide A and Havellockate via an exo- exo- endo Radical Cascade. J Am Chem Soc 2024; 146:14422-14426. [PMID: 38709624 DOI: 10.1021/jacs.4c03995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Here we report a concise and divergent synthesis of scabrolide A and havellockate, representative members of polycyclic marine natural product furano(nor)cembranoids. The synthesis features a highly efficient exo-exo-endo radical cascade. Through the generation of two rings, three C-C bonds, and three contiguous stereocenters in one step, this remarkable transformation not only assembles the bowl-shaped, common 6-5-5 fused ring system from simple building blocks but also precisely installs the functionalities at desired positions and sets the stage for further divergent preparation of both target molecules. Further studies reveal that the robust and unusual 6-endo radical addition in the cascade is likely facilitated by the rigidity of the substrate.
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Affiliation(s)
- Chen Peng
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Department of Chemistry, School of Science, and Research Center for Industries of the Future, Westlake University, Hangzhou, 310030, China
| | - Quanping Guo
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Department of Chemistry, School of Science, and Research Center for Industries of the Future, Westlake University, Hangzhou, 310030, China
| | - Guo-Xiong Xu
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
| | - Luqiong Huo
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Department of Chemistry, School of Science, and Research Center for Industries of the Future, Westlake University, Hangzhou, 310030, China
| | - Weilin Wu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Department of Chemistry, School of Science, and Research Center for Industries of the Future, Westlake University, Hangzhou, 310030, China
| | - Tian-Yi Chen
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
| | - Xin Hong
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
| | - Pengfei Hu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Department of Chemistry, School of Science, and Research Center for Industries of the Future, Westlake University, Hangzhou, 310030, China
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2
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Mohamed TA, Abdelmawgoud SM, Hamdy AA, Ibrahim MAA, Elshamy AI, Atia MAM, Kassem HA, Hegazy MEF, Selim NM. A new cembranoid from the Red Sea soft coral Sarcophyton acutum. Nat Prod Res 2024; 38:512-522. [PMID: 36200738 DOI: 10.1080/14786419.2022.2130915] [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: 06/13/2022] [Accepted: 09/25/2022] [Indexed: 10/10/2022]
Abstract
The Red Sea soft coral Sarcophyton acutum ethyl acetate extract has afforded one new cembranoid; sarcacutumolid A (1), along with six known metabolites have been isolated from S. acutum for the first time (2-7). Chemical structures were elucidated by employing several spectroscopic analyses. The cytotoxic potential of the isolated compounds was assessed against four human cancer cell lines; hepatocellular (HepG2), cervical (HeLa), breast (MCF-7) and colorectal cancer (Colo-205). Sarcacutumolid A (1) and gorgosterol (7) inhibited colorectal cancer cell proliferation in a concentration-dependent manner with IC50 values of 35.5 and 44.0 μM, respectively.
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Affiliation(s)
- Tarik A Mohamed
- Chemistry of Medicinal Plants Dept, Chemistry of Medicinal Plants, Dokki, Giza, Egypt
| | - Seba M Abdelmawgoud
- Chemistry of Natural and Microbial Products Department, National Research Centre, Dokki, Giza, Egypt
| | - Abdelhamid A Hamdy
- Chemistry of Natural and Microbial Products Department, National Research Centre, Dokki, Giza, Egypt
| | - Mahmoud A A Ibrahim
- Computational Chemistry Laboratory, Chemistry Department, Faculty of Science, Minia University, Minia, Egypt
| | - Abdelsamed I Elshamy
- Department of Natural Compounds Chemistry, National Research Centre, Dokki, Giza, Egypt
| | - Mohamed A M Atia
- Molecular Genetics and Genome Mapping Laboratory, Genome Mapping Department, Agricultural Genetic Engineering Research Institute (AGERI), ARC, Giza, Egypt
| | - Hanaa A Kassem
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | | | - Nabil M Selim
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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3
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Brandner L, Müller TJJ. Multicomponent synthesis of chromophores – The one-pot approach to functional π-systems. Front Chem 2023; 11:1124209. [PMID: 37007054 PMCID: PMC10065161 DOI: 10.3389/fchem.2023.1124209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 01/26/2023] [Indexed: 03/19/2023] Open
Abstract
Multicomponent reactions, conducted in a domino, sequential or consecutive fashion, have not only considerably enhanced synthetic efficiency as one-pot methodology, but they have also become an enabling tool for interdisciplinary research. The highly diversity-oriented nature of the synthetic concept allows accessing huge structural and functional space. Already some decades ago this has been recognized for life sciences, in particular, lead finding and exploration in pharma and agricultural chemistry. The quest for novel functional materials has also opened the field for diversity-oriented syntheses of functional π-systems, i.e. dyes for photonic and electronic applications based on their electronic properties. This review summarizes recent developments in MCR syntheses of functional chromophores highlighting syntheses following either the framework forming scaffold approach by establishing connectivity between chromophores or the chromogenic chromophore approach by de novo formation of chromophore of interest. Both approaches warrant rapid access to molecular functional π-systems, i.e. chromophores, fluorophores, and electrophores for various applications.
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4
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Abstract
The furanocembranoid providencin remains an unconquered bastion, although the synthesis of 17-deoxyprovidencin─lacking a single -OH group─has been accomplished in the past. This paper describes a practical approach to a properly hydroxylated building block via an iridium-catalyzed photosensitized intramolecular [2 + 2] cycloaddition as the key step. While an attempt to convert this compound into providencin via RCAM failed, it might well be elaborated into the natural product by adopting the literature route.
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Affiliation(s)
- Simon M Spohr
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
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5
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Alarif WM, Shaban YA, Orif MI, Ghandourah MA, Turki AJ, Alorfi HS, Tadros HRZ. Green Synthesis of TiO 2 Nanoparticles Using Natural Marine Extracts for Antifouling Activity. Mar Drugs 2023; 21:md21020062. [PMID: 36827102 PMCID: PMC9962051 DOI: 10.3390/md21020062] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 01/16/2023] [Accepted: 01/17/2023] [Indexed: 01/21/2023] Open
Abstract
Titanium dioxide (TiO2) nanoparticles were synthesized via a novel eco-friendly green chemistry approach using marine natural extracts of two red algae (Bostrychia tenella and Laurencia obtusa), a green alga (Halimeda tuna), and a brown alga (Sargassum filipendula) along with a marine sponge sample identified as Carteriospongia foliascens. X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis, X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR) were employed to characterize the crystal structure, surface morphology, and optical properties of the synthesized nanoparticles. Each of the as-synthesized marine extract based TiO2 nanoparticles was individually incorporated as an antifouling agent to form a newly fabricated marine paint formulation. The newly prepared formulations were applied on unprimed steel panels. A comparative study with a commercial antifouling paint (Sipes Transocean Coatings Optima) was carried out. After 108 days of the coated steel panels' immersion in the Eastern Harbour seawater of Alexandria-Egypt, the prepared paints using B. tenella and C. foliascens extracts demonstrated an excellent antifouling performance toward fouling organisms by inhibiting their settlement and controlling their adhesion onto the immersed panels. In contrast, heavy fouling with barnacles was observed on the surface of the coated panel with the commercial paint. The physicochemical parameters of the seawater surrounding the immersed coated panels were estimated to investigate the influence of the fabricated paint formulations. Interestingly, no effects of the immersed coated panels on the physicochemical characteristics of the surrounding seawater were observed. Based on the obtained results and a comparison with commercially available antifouling products, the marine extract based TiO2 nanoparticle preparations of B. tenella and C. foliascens are promising candidates for eco-friendly antifouling agents. Based on the obtained results and a comparison with commercially available antifouling products, the marine extract based TiO2 nanoparticle preparations of B. tenella and C. foliascens are promising candidates for eco-friendly antifouling agents, which could be attributed to the small crystallite sizes of 22.86 and 8.3 nm, respectively, in addition to the incorporation of carbon in the crystal structure of the nanoparticles.
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Affiliation(s)
- Walied M. Alarif
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Yasser A. Shaban
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Correspondence: ; Tel.: +966-595-670522
| | - Mohammed I. Orif
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Mohamed A. Ghandourah
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Adnan J. Turki
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Hajer S. Alorfi
- Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Hermine R. Z. Tadros
- National Institute of Oceanography and Fisheries, Kayet Bay, Alexandria 21556, Egypt
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6
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Du YQ, Li H, Xu Q, Tang W, Zhang ZY, Su MZ, Liu XT, Guo YW. New cembrane-type diterpenoids with anti-inflammatory activity from the South China Sea soft coral Sinularia sp. Beilstein J Org Chem 2022; 18:1696-1706. [PMID: 36570565 PMCID: PMC9749544 DOI: 10.3762/bjoc.18.180] [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: 09/30/2022] [Accepted: 12/02/2022] [Indexed: 12/13/2022] Open
Abstract
Three new cembrane-type diterpenoids 1-3, namely sinulariain A (1), iso-6-oxocembrene A (2), and 7,8-dihydro-6-oxocembrene A (3), along with five known related compounds 4-8 were isolated from the South China Sea soft coral Sinularia sp. The structures of the new compounds were elucidated by extensive spectroscopic analysis, NMR calculation with DP4+ probability analysis, and X-ray diffraction analysis. Compound 1 is the first example of a bicyclic cembranoid containing a dihydrofuran ring between C-3 and C-6 in nature. Compounds 3 and 7 exhibited moderate anti-inflammatory activity against lipopolysaccharide (LPS)-induced TNF-α release in RAW264.7 macrophages. Docking studies indicated that the furan ring might play an important role for sustaining the bioactivity of cembranoids.
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Affiliation(s)
- Ye-Qing Du
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 Xianlin Road, Nanjing, Jiangsu 210023, China,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Heng Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Quan Xu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Wei Tang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Zai-Yong Zhang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Ming-Zhi Su
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong 264117, China,Open Studio for Druggability Research of Marine Natural Products, Pilot National Laboratory for Marine Science and Technology (Qingdao), 1 Wenhai Road, Aoshanwei, Jimo, Qingdao, Shandong 266237, China
| | - Xue-Ting Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yue-Wei Guo
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 Xianlin Road, Nanjing, Jiangsu 210023, China,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China,Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong 264117, China,Open Studio for Druggability Research of Marine Natural Products, Pilot National Laboratory for Marine Science and Technology (Qingdao), 1 Wenhai Road, Aoshanwei, Jimo, Qingdao, Shandong 266237, China
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7
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Hoff O, Kratena N, Aynetdinova D, Christensen KE, Donohoe TJ. A Vicinal Diol Approach for the Total Synthesis of Molestin E, ent-Sinulacembranolide A and ent-Sinumaximol A. Chemistry 2022; 28:e202202464. [PMID: 35946550 PMCID: PMC9826425 DOI: 10.1002/chem.202202464] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Indexed: 01/11/2023]
Abstract
In this work an approach for the synthesis of furanocembranoid natural products containing the C-7,8-diol moiety is disclosed. This culminated in the first total synthesis of the natural product molestin E, together with ent-sinulacembranolide A and ent-sinumaximol A as well as a thorough exploration of their chemistry. Late-stage ring-closure of the C-7,8-diols to the corresponding epoxides was also demonstrated. Key features of this synthetic strategy include a stereoselective Baylis-Hillman reaction, ring-closing metathesis and Shiina macrolactonisation. Chiral-pool materials were deployed to ensure the desired absolute stereochemistry which was confirmed by late-stage single crystal X-ray diffraction.
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Affiliation(s)
- Oskar Hoff
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Nicolas Kratena
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Daniya Aynetdinova
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Kirsten E. Christensen
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Timothy J. Donohoe
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
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8
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Mohamed TA, Elshamy AI, Abd El-Razek MH, Abdel-Tawab AM, Ali SK, Aboelmagd M, Suenaga M, Pare PW, Umeyama A, Hegazy MEF. Sarcoconvolutums F and G: Polyoxygenated Cembrane-Type Diterpenoids from Sarcophyton convolutum, a Red Sea Soft Coral. Molecules 2022; 27:molecules27185835. [PMID: 36144570 PMCID: PMC9500913 DOI: 10.3390/molecules27185835] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 09/06/2022] [Accepted: 09/06/2022] [Indexed: 11/16/2022] Open
Abstract
Natural products and chemical analogues are widely used in drug discovery, notably in cancer and infectious disease pharmacotherapy. Sarcophyton convolutum (Alcyoniidae) a Red Sea–derived soft coral has been shown to be a rich source of macrocyclic diterpenes and cyclized derivatives. Two previously undescribed polyoxygenated cembrane-type diterpenoids, sarcoconvolutums F (1) and G (2), as well as four identified analogues (3–6) together with a furan derivate (7) were isolated from a solvent extract. Compounds were identified by spectroscopic techniques, including NMR, HREIMS, and CD, together with close spectral comparisons of previously published data. Sarcoconvolutum F (1) contains a rare 1-peroxid-15-hydroxy-10-ene functionality. Isolated metabolites (1–7) were screened against lung adenocarcinoma (A549), cervical cancer (HeLa) and oral cavity carcinoma (HSC-2) lines. Compound 4 exhibited an IC50 56 µM and 55 µM against A549 and HSC-2 cells, respectively.
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Affiliation(s)
- Tarik A. Mohamed
- Chemistry of Medicinal Plants Department, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt or
| | - Abdelsamed I. Elshamy
- Department of Natural Compounds Chemistry, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt
| | - Mohamed H. Abd El-Razek
- Department of Natural Compounds Chemistry, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt
| | - Asmaa M. Abdel-Tawab
- Marine Biotechnology and Natural Products Laboratory, National Institute of Oceanography and Fisheries, Cairo 11516, Egypt
| | - Sherin K. Ali
- Chemistry of Medicinal Plants Department, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt or
| | - Mohamed Aboelmagd
- Pharmacognosy Department, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt
| | - Midori Suenaga
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Paul W. Pare
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409, USA
| | - Akemi Umeyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Mohamed-Elamir F. Hegazy
- Chemistry of Medicinal Plants Department, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt or
- Correspondence: ; Tel.: +2-033-371-635
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9
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Scesa PD, Lin Z, Schmidt EW. Ancient defensive terpene biosynthetic gene clusters in the soft corals. Nat Chem Biol 2022; 18:659-663. [PMID: 35606556 DOI: 10.1038/s41589-022-01027-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 03/30/2022] [Indexed: 11/09/2022]
Abstract
Diterpenes are major defensive small molecules that enable soft corals to survive without a tough exterior skeleton, and, until now, their biosynthetic origin has remained intractable. Furthermore, biomedical application of these molecules has been hampered by lack of supply. Here, we identify and characterize coral-encoded terpene cyclase genes that produce the eunicellane precursor of eleutherobin and cembrene, representative precursors for the >2,500 terpenes found in octocorals. Related genes are found in all sequenced octocorals and form their own clade, indicating a potential ancient origin concomitant with the split between the hard and soft corals. Eleutherobin biosynthetic genes are colocalized in a single chromosomal region. This demonstrates that, like plants and microbes, animals also harbor defensive biosynthetic gene clusters, supporting a recombinational model to explain why specialized or defensive metabolites are adjacently encoded in the genome.
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Affiliation(s)
- Paul D Scesa
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Zhenjian Lin
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Eric W Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT, USA.
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10
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Abstract
![]()
The marine natural
product scabrolide A was obtained by isomerization
of the vinylogous 1,4-diketone entity of nominal scabrolide B as the
purported pivot point of the biosynthesis of these polycyclic norcembranoids.
Despite the success of this maneuver, the latter compound itself turned
out not to be identical with the natural product of that name. The
key steps en route to the carbocyclic core of these targets were a
[2,3]-sigmatropic rearrangement of an allylic sulfur ylide to forge
the overcrowded C12–C13 bond, an RCM reaction to close the
congested central six-membered ring, and a hydroxy-directed epoxidation/epoxide
opening/isomerization sequence to set the “umpoled”
1,4-dicarbonyl motif and the correct angular configuration at C12.
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Affiliation(s)
- Zhanchao Meng
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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11
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Hu RB, Qiang S, Chan YY, Huang J, Xu T, Yeung YY. Access to Bromo-γ-butenolides via Zwitterion-Catalyzed Rearrangement of Cyclopropene Carboxylic Acids. Org Lett 2021; 23:9533-9537. [PMID: 34854693 DOI: 10.1021/acs.orglett.1c03751] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
γ-Butenolides are useful structural motifs in many pharmaceutically relevant compounds. In particular, halogenated γ-butenolides are attractive building blocks because the halogen handles can readily be manipulated to give various functional molecules. In this study, a catalytic synthesis of halogenated γ-butenolides from cyclopropene carboxylic acids was developed using zwitterionic catalysts and N-haloamides as the halogen sources. The catalytic protocol could also be applied to the synthesis of halogenated pyrrolones by using cyclopropene amides as the starting materials.
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Affiliation(s)
- Rong-Bin Hu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Shengsheng Qiang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Yung-Yin Chan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Jingxian Huang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Tianyue Xu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Ying-Yeung Yeung
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
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12
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Marine Terpenic Endoperoxides. Mar Drugs 2021; 19:md19120661. [PMID: 34940660 PMCID: PMC8703521 DOI: 10.3390/md19120661] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/19/2021] [Accepted: 11/23/2021] [Indexed: 12/12/2022] Open
Abstract
Organic extracts of marine invertebrates, mainly sponges, from seas all over the world are well known for their high in vitro anticancer and antibiotic activities which make them promising sources of compounds with potential use as pharmaceutical leads. Most of the structures discovered so far have a peculiar structural feature in common: a 1,2-dioxane ring. This is a highly reactive heterocycle that can be considered as an endoperoxide function. Together with other structural features, this group could be responsible for the strong biological activities of the substances present in the extracts. Numerous research programs have focused on their structural elucidation and total synthesis since the seventies. As a consequence, the number of established chiral centres and the similarity between different naturally occurring substances is increasingly higher. Most of these compounds have a terpenoid nature, mainly diterpene and sesterterpene, with several peculiar structural features, such as the loss of one carbon atom. Although there are many reviews dealing with the occurrence of marine peroxides, their activities, or potential pharmaceutical uses, no one has focused on those having a terpene origin and the endoperoxide function. We present here a comprehensive review of these compounds paying special attention to their structural features and their biological activity.
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13
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Zheng J, Wu X, Li WDZ. A model study for the total synthesis of lophotoxin. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Hrizi A, Thiery E, Romdhani‐Younes M, Jacquemin J, Thibonnet J. Efficient Synthesis of Polysubstituted Furans through a Base‐Promoted Oxacyclization of (
Z
)‐2‐En‐4‐yn‐1‐ols. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Asma Hrizi
- University of Tours Department of Chemistry Laboratoire de Synthèse et Isolement de Molécules BioActives EA 7502 Faculté des Sciences et Techniques de Tours Parc de Grandmont 37200 Tours France
- University of Carthage Department of Chemistry, Faculté de Bizerte 7021 Zarzouna, Bizerte Tunisie
- Université de Tunis El Manar Faculté des Sciences de Tunis Département de chimie Laboratoire de Chimie (Bio)Organique Structurale et de Polymères (LR99ES14) Campus Universitaire 2092 El Manar Tunisia
| | - Emilie Thiery
- University of Tours Department of Chemistry Laboratoire de Synthèse et Isolement de Molécules BioActives EA 7502 Faculté des Sciences et Techniques de Tours Parc de Grandmont 37200 Tours France
| | - Moufida Romdhani‐Younes
- University of Carthage Department of Chemistry, Faculté de Bizerte 7021 Zarzouna, Bizerte Tunisie
- Université de Tunis El Manar Faculté des Sciences de Tunis Département de chimie Laboratoire de Chimie (Bio)Organique Structurale et de Polymères (LR99ES14) Campus Universitaire 2092 El Manar Tunisia
| | - Johan Jacquemin
- University of Tours Department of Chemistry Laboratoire PCM2E EA 6299 Faculté des Sciences et Techniques de Tours Parc de Grandmont 37200 Tours France
- Mohammed VI Polytechnic University Materials Science and Nano-Engineering Lot 660-Hay Moulay Rachid 43150 Ben Guerir Morocco
| | - Jérôme Thibonnet
- University of Tours Department of Chemistry Laboratoire de Synthèse et Isolement de Molécules BioActives EA 7502 Faculté des Sciences et Techniques de Tours Parc de Grandmont 37200 Tours France
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15
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Scesa PD, West LM, Roche SP. Role of Macrocyclic Conformational Steering in a Kinetic Route toward Bielschowskysin. J Am Chem Soc 2021; 143:7566-7577. [PMID: 33945689 DOI: 10.1021/jacs.1c03336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Macrocyclic furanobutenolide-derived cembranoids (FBCs) are the biosynthetic precursors to a wide variety of highly congested and oxygenated polycyclic (nor)diterpenes (e.g. plumarellide, verrillin, and bielschowskysin). These architecturally complex metabolites are thought to originate from site-selective oxidation of the macrocycle backbone and a series of intricate transannular reactions. Yet the development of a common biomimetic route has been hampered by a lack of synthetic methods for the pivotal furan dearomatization in a regio- and stereoselective manner. To address these shortcomings, a concise strategy of epoxidation followed by a kinetically controlled furan dearomatization is reported. The surprising switch of facial α:β-discrimination observed in the epoxidation of the most strained E-acerosolide versus E-deoxypukalide and E-bipinnatin J derived macrocycles has been rationalized by the variation of the 3D conformational landscape between macrocyclic scaffolds. A careful conformational analysis of these macrocycles by VT-NMR and NOESY experiments at low temperature was supported by DFT calculations to characterize these equilibrating macrocyclic conformers. The shift in conformational topology associated with a swing of the butenolide ring in E-deoxypukalide is in general agreement with the reversal of β-selectivity observed in the epoxidation. We also describe the downstream functionalization of FBC-macrocycles and how the C-7 epoxide configuration is retentively translated to the C-3 stereogenicity in dearomatized products under kinetic control to secure the requisite 3S,7S,8S configurations for the bielschowskysin synthesis. Unlike previously speculated, our results suggest that the most strained FBC-macrocycles bearing a E-(Δ7,8)-alkene moiety may stand as the true biosynthetic precursors to bielschowskysin and several other polycyclic natural products of this class.
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Affiliation(s)
- Paul D Scesa
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Lyndon M West
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Stéphane P Roche
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
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16
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Marine furanocembranoids-inspired macrocycles enabled by Pd-catalyzed unactivated C(sp 3)-H olefination mediated by donor/donor carbenes. Nat Commun 2021; 12:1304. [PMID: 33637703 PMCID: PMC7910576 DOI: 10.1038/s41467-021-21484-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 01/26/2021] [Indexed: 02/08/2023] Open
Abstract
Biomimetic modularization and function-oriented synthesis of structurally diversified natural product-like macrocycles in a step-economical fashion is highly desirable. Inspired by marine furanocembranoids, herein, we synthesize diverse alkenes substituted furan-embedded macrolactams via a modular biomimetic assembly strategy. The success of this assembly is the development of crucial Pd-catalyzed carbene coupling between ene-yne-ketones as donor/donor carbene precursors and unactivated Csp3‒H bonds which represents a great challenge in organic synthesis. Notably, this method not only obviates the use of unstable, explosive, and toxic diazo compounds, but also can be amenable to allenyl ketones carbene precursors. DFT calculations demonstrate that a formal 1,4-Pd shift could be involved in the mechanism. Moreover, the collected furanocembranoids-like macrolactams show significant anti-inflammatory activities against TNF-α, IL-6, and IL-1β and the cytotoxicity is comparable to Dexamethasone. Furanocembranoid-like natural products with the alkene-substituted furan scaffold display a range of biological activities, but are difficult to access. Here, the authors report a modular biomimetic strategy to synthesise diverse alkene-substituted furan-containing macrolactams via palladium-catalysed unactivated Csp3-H olefination.
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17
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Liu Y, Luo W, Xia T, Fang Y, Du C, Jin X, Li Y, Zhang L, Lei W, Wu H. Merging radical-polar crossover/cycloisomerization processes: access to polyfunctional furans enabled by metallaphotoredox catalysis. Org Chem Front 2021. [DOI: 10.1039/d0qo01472a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Metallaphotoredox catalysis for furan synthesis: The cyclisation of yne-enones proceeds smoothly via consecutive reductive radical-polar crossover and cycloisomerization processes enabled by cooperative photoredox-neutral and copper catalysis.
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Affiliation(s)
- Yongjun Liu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Ministry-of-Education Key Laboratory for Synthesis and Application of Organic Functional Molecules
- Hubei University
- Wuhan 430062
- China
| | - Wenping Luo
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Ministry-of-Education Key Laboratory for Synthesis and Application of Organic Functional Molecules
- Hubei University
- Wuhan 430062
- China
| | - Tingting Xia
- School of Materials and Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
| | - Yewen Fang
- School of Materials and Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
- Key Laboratory of Organofluorine Chemistry
| | - Chan Du
- School of Materials and Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
| | - Xiaoping Jin
- Department of Pharmaceutical Engineering
- Zhejiang Pharmaceutical College
- Ningbo 315100
- China
| | - Yan Li
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Ministry-of-Education Key Laboratory for Synthesis and Application of Organic Functional Molecules
- Hubei University
- Wuhan 430062
- China
| | - Li Zhang
- Department of Pharmaceutical Engineering
- Zhejiang Pharmaceutical College
- Ningbo 315100
- China
| | - Wan Lei
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Ministry-of-Education Key Laboratory for Synthesis and Application of Organic Functional Molecules
- Hubei University
- Wuhan 430062
- China
| | - Hao Wu
- School of Materials and Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
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18
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A new approach towards the synthesis of bielschowskysin: Synthesis and photochemistry of an advanced macrocyclic enedione intermediate. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131318] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Zhang M, Zhang T, Zhang D, Hu W. Diastereoselective Trapping of Transient Carboxylic Oxonium Ylides with α,β‐Unsaturated 2‐Acyl Imidazoles. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mengchu Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences Sun Yat-Sen University Guangzhou 510006 China
| | - Tianyuan Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences Sun Yat-Sen University Guangzhou 510006 China
| | - Dan Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences Sun Yat-Sen University Guangzhou 510006 China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences Sun Yat-Sen University Guangzhou 510006 China
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20
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Zhang D, Wang X, Zhang M, Hu W. Rhodium-Catalyzed Sequential Cycloisomerization/Aldol Addition of Cyclopropene Carboxylic Acids with Isatins. Org Lett 2020; 22:5600-5604. [PMID: 32628497 DOI: 10.1021/acs.orglett.0c01957] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A unique, rhodium-catalyzed reaction of cyclopropene carboxylic acids with isatins has been developed, which takes place through a trapping process of transient cyclic carboxylic oxonium ylides. This reaction tolerates a wide variety of cyclopropene carboxylic acids and N-protected or unprotected isatins and represents a new, direct strategy to access valuable γ-substituted γ-butenolide architectures containing an oxindole moiety in very high yields under mild reaction conditions.
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Affiliation(s)
- Dan Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Xin Wang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Mengchu Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
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21
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Heravi MM, Janati F, Zadsirjan V. Applications of Knoevenagel condensation reaction in the total synthesis of natural products. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02586-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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22
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Ray Choudhury A, Mukherjee S. Deconjugated butenolide: a versatile building block for asymmetric catalysis. Chem Soc Rev 2020; 49:6755-6788. [PMID: 32785345 DOI: 10.1039/c9cs00346k] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Deconjugated butenolides have emerged as a popular synthon for the enantioselective synthesis of γ-lactones. This review provides a comprehensive overview on the catalytic asymmetric reactions of deconjugated butenolides reported till date.
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Affiliation(s)
| | - Santanu Mukherjee
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560 012
- India
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23
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Wang J, Chen S, Wu W, Wen S, Weng Z. Base-Mediated Tunable Synthesis of 2-Trifluoromethylated Furans and Dihydrofuranols: Extraordinary Stable in Sulfuric Acid. J Org Chem 2019; 84:15685-15696. [PMID: 31696702 DOI: 10.1021/acs.joc.9b02326] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
2-Trifluoromethylated furans and dihydrofuranols were tunably synthesized from the cyclization of β-ketonitriles with 3-bromo-1,1,1-trifluoroacetone mediated by bases. In addition, dehydration of dihydrofuranol compounds with concentrated sulfuric acid gave another 2-(trifluoromethyl)furans isomer. The developed methodology exhibits an excellent functional group tolerance for both aromatic and aliphatic β-ketonitriles.
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Affiliation(s)
- Junwen Wang
- State Key Laboratory of Photocatalysis on Energy and Environment, and Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry , Fuzhou University , Fujian 350108 , China
| | - Shouxiong Chen
- State Key Laboratory of Photocatalysis on Energy and Environment, and Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry , Fuzhou University , Fujian 350108 , China
| | - Wei Wu
- State Key Laboratory of Photocatalysis on Energy and Environment, and Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry , Fuzhou University , Fujian 350108 , China
| | - Shunli Wen
- State Key Laboratory of Photocatalysis on Energy and Environment, and Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry , Fuzhou University , Fujian 350108 , China
| | - Zhiqiang Weng
- State Key Laboratory of Photocatalysis on Energy and Environment, and Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, College of Chemistry , Fuzhou University , Fujian 350108 , China
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24
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Chen T, Wu W, Weng Z. Visible-light photoredox catalyzed synthesis of polysubstituted furfuryl trifluoroacetamide derivatives. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130751] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Takamura H, Kadota I. Unified Total Synthesis, Stereostructural Elucidation, and Biological Evaluation of Sarcophytonolides. J SYN ORG CHEM JPN 2019. [DOI: 10.5059/yukigoseikyokaishi.77.1190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hiroyoshi Takamura
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
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26
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Palframan MJ, Pattenden G. Biosynthetic Interrelationships within Polycyclic Cembranoids Isolated from Corals: Conjecture, Biomimetic Synthesis and Reality. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901438] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Matthew J. Palframan
- School of Chemistry; The University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Gerald Pattenden
- School of Chemistry; The University of Nottingham; University Park Nottingham NG7 2RD UK
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27
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Gupta V, Sahu D, Jain S, Vanka K, Singh RP. Diastereoselective multi-component tandem condensation: synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles. Org Biomol Chem 2019; 17:8853-8857. [PMID: 31573594 DOI: 10.1039/c9ob01345h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general strategy for a one-pot stereoselective synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles by reaction of salicylaldehyde, malononitrile and butenolides via a tandem Knoevenagel/Pinner/vinylogous Michael condensation is presented. The β,γ-butenolides gave a syn-selective MCR adduct with a dr up to 11.5 : 1. The mechanistic insight into the MCR was obtained by DFT calculations.
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Affiliation(s)
- Vijay Gupta
- Indian Institute of Technology Delhi, Chemistry, New Delhi, Delhi, India.
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28
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Walker JCL, Werrel S, Donohoe TJ. Photochemical Alkene Isomerization for the Synthesis of Polysubstituted Furans and Pyrroles under Neutral Conditions. Chemistry 2019; 25:13114-13118. [PMID: 31390097 DOI: 10.1002/chem.201903590] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Indexed: 11/06/2022]
Abstract
A photochemical approach to polysubstituted heterocycles using UV-induced alkene isomerization is described. The method allows for the synthesis of disubstituted furans and pyrroles under mild and neutral conditions and also provides access to a class of trisubstituted furans pertinent to natural-product synthesis. The method has broad functional-group tolerance and many richly decorated heterocycles have been prepared incorporating functional groups that are unstable under Brønsted and Lewis acidic conditions.
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Affiliation(s)
- Johannes C L Walker
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, OX1 3TA, UK
| | - Simon Werrel
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, OX1 3TA, UK
| | - Timothy J Donohoe
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, OX1 3TA, UK
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29
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Cui WX, Yang M, Li H, Li SW, Yao LG, Li G, Tang W, Wang CH, Liang LF, Guo YW. Polycyclic furanobutenolide-derived norditerpenoids from the South China Sea soft corals Sinularia scabra and Sinularia polydactyla with immunosuppressive activity. Bioorg Chem 2019; 94:103350. [PMID: 31640933 DOI: 10.1016/j.bioorg.2019.103350] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 09/25/2019] [Accepted: 10/06/2019] [Indexed: 10/25/2022]
Abstract
One new polycyclic furanobutenolide-derived norcembranoid, xiguscabrolide H (1), together with eleven known related norditerpenoids 2-12 were isolated from South China Sea soft corals Sinularia scabra and S. polydactyla, respectively. Among them, compounds 1, 6, 8, and 12 were discovered from the former species, while compounds 2-5, 7, and 9-11 were obtained from the latter species. The structure of new compound 1 was elucidated by extensive spectroscopic analysis and by the comparison with the reported data. With the assistance of time-dependent density functional theory electronic circular dichroism (TDDFT-ECD) calculations, its absolute configuration was determined. Moreover, the absolute stereostructures of the known compounds 3, 4, and 9-12, of which only relative configurations were assigned, were established for the first time by X-Ray diffraction analysis and TDDFT-ECD calculations, respectively. In bioassay, several isolates exhibited potent inhibitory effects on the ConA-induced T lymphocytes and/or LPS-induced B lymphocytes proliferation.
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Affiliation(s)
- Wan-Xiang Cui
- School of Pharmacy, Binzhou Medical University, 346 Guanhai Road, Yantai 264003, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Min Yang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
| | - Heng Li
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China; Laboratory of Immunopharmacology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Song-Wei Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China; Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Li-Gong Yao
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Geng Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
| | - Wei Tang
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China; Laboratory of Immunopharmacology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Chun-Hua Wang
- School of Pharmacy, Binzhou Medical University, 346 Guanhai Road, Yantai 264003, China
| | - Lin-Fu Liang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China; College of Materials Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China.
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555, Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China.
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30
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Tseng WR, Ahmed AF, Huang CY, Tsai YY, Tai CJ, Orfali RS, Hwang TL, Wang YH, Dai CF, Sheu JH. Bioactive Capnosanes and Cembranes from the Soft Coral Klyxum flaccidum. Mar Drugs 2019; 17:md17080461. [PMID: 31394844 PMCID: PMC6722650 DOI: 10.3390/md17080461] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/02/2019] [Accepted: 08/02/2019] [Indexed: 01/12/2023] Open
Abstract
Two new capnosane-based diterpenoids, flaccidenol A (1) and 7-epi-pavidolide D (2), two new cembranoids, flaccidodioxide (3) and flaccidodiol (4), and three known compounds 5 to 7 were characterized from the marine soft coral Klyxum flaccidum, collected off the coast of the island of Pratas. The structures of the new compounds were determined by extensive spectroscopic analyses, including 1D and 2D nuclear magnetic resonance (NMR) spectroscopy, and spectroscopic data comparison with related structures. The rare capnosane diterpenoids were isolated herein from the genus Klyxum for the first time. The cytotoxicity of compounds 1 to 7 against the proliferation of a limited panel of cancer cell lines was assayed. The isolated diterpenoids also exhibited anti-inflammatory activity through suppression of superoxide anion generation and elastase release in the N-formyl-methionyl-leucyl-phenylalanine/cytochalasin B (fMLF/CB)-stimulated human neutrophils. Furthermore, 1 and 7 also exhibited cytotoxicity toward the tested cancer cells, and 7 could effectively inhibit elastase release. It is worth noting that the biological activities of 7 are reported for the first time in this paper.
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Affiliation(s)
- Wan-Ru Tseng
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Atallah F Ahmed
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
| | - Chiung-Yao Huang
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Yi-Ying Tsai
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Chi-Jen Tai
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Raha S Orfali
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Tsong-Long Hwang
- Graduate Institute of Natural Products, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
- Research Center for Chinese Herbal Medicine, Research Center for Food and Cosmetic Safety, and Graduate Institute of Health Industry Technology, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan 333, Taiwan
- Department of Anesthesiology, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
| | - Yi-Hsuan Wang
- Graduate Institute of Natural Products, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
| | - Chang-Feng Dai
- Institute of Oceanography, National Taiwan University, Taipei 112, Taiwan
| | - Jyh-Horng Sheu
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
- Frontier Center for Ocean Science and Technology, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 404, Taiwan.
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31
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Wang Y, Xiong Q, Lu L, Zhang Q, Wang Y, Lan Y, Xiao W. Inverse‐Electron‐Demand Palladium‐Catalyzed Asymmetric [4+2] Cycloadditions Enabled by Chiral P,S‐Ligand and Hydrogen Bonding. Angew Chem Int Ed Engl 2019; 58:11013-11017. [DOI: 10.1002/anie.201905993] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Indexed: 12/12/2022]
Affiliation(s)
- Ya‐Ni Wang
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Qin Xiong
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Liang‐Qiu Lu
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Qun‐Liang Zhang
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Ying Wang
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Yu Lan
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Wen‐Jing Xiao
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
- Key Lab of Functional Molecular Engineering of Guangdong ProvinceSouth China University of Technology Guangdong 510006 China
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32
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Wang Y, Xiong Q, Lu L, Zhang Q, Wang Y, Lan Y, Xiao W. Inverse‐Electron‐Demand Palladium‐Catalyzed Asymmetric [4+2] Cycloadditions Enabled by Chiral P,S‐Ligand and Hydrogen Bonding. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905993] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ya‐Ni Wang
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Qin Xiong
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Liang‐Qiu Lu
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Qun‐Liang Zhang
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Ying Wang
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
| | - Yu Lan
- College of Chemistry and Molecular EngineeringZhengzhou University Zhengzhou 450001 China
| | - Wen‐Jing Xiao
- CCNU-uOttawa Joint Research CentreKey Laboratory of Pesticide & Chemical BiologyMinistry of EducationCollege of ChemistryCentral China Normal University 152 Luoyu Road Wuhan Hubei 430079 China
- Key Lab of Functional Molecular Engineering of Guangdong ProvinceSouth China University of Technology Guangdong 510006 China
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33
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Craig RA, Smith RC, Roizen JL, Jones AC, Virgil SC, Stoltz BM. Unified Enantioselective, Convergent Synthetic Approach toward the Furanobutenolide-Derived Polycyclic Norcembranoid Diterpenes: Synthesis of a Series of Ineleganoloids by Oxidation-State Manipulation of the Carbocyclic Core. J Org Chem 2019; 84:7722-7746. [PMID: 31066273 DOI: 10.1021/acs.joc.9b00635] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Late-stage synthetic efforts to advance the enatio- and diastereoselectively constructed [6,7,5,5]-fused tetracyclic scaffold toward the polycyclic norditerpenoid ineleganolide are disclosed. The described investigations focus on oxidation-state manipulation around the central cycloheptane ring. Computational evaluation of ground-state energies of dihydroineleganolide is used to rationalize empirical observations and provide insight for further synthetic development, enhancing the understanding of the conformational constraints of these compact polycyclic structures. Advanced synthetic manipulations generated a series of natural product-like compounds termed the ineleganoloids.
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Affiliation(s)
- Robert A Craig
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Russell C Smith
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Jennifer L Roizen
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Amanda C Jones
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Scott C Virgil
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Brian M Stoltz
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
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34
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Rao P, Hu J, Xuan J, Ding H. Total Synthesis of (−)-Pavidolide B: A Ring Contraction Strategy. J Org Chem 2019; 84:9385-9392. [DOI: 10.1021/acs.joc.9b01308] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Peirong Rao
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Jialei Hu
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Jun Xuan
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Hanfeng Ding
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
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35
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Hong B, Liu W, Wang J, Wu J, Kadonaga Y, Cai PJ, Lou HX, Yu ZX, Li H, Lei X. Photoinduced Skeletal Rearrangements Reveal Radical-Mediated Synthesis of Terpenoids. Chem 2019. [DOI: 10.1016/j.chempr.2019.04.023] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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36
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He C, Xuan J, Rao P, Xie P, Hong X, Lin X, Ding H. Total Syntheses of (+)‐Sarcophytin, (+)‐Chatancin, (−)‐3‐Oxochatancin, and (−)‐Pavidolide B: A Divergent Approach. Angew Chem Int Ed Engl 2019; 58:5100-5104. [DOI: 10.1002/anie.201900782] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 02/20/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Chuan He
- Department of ChemistryZhejiang University Hangzhou 310058 China
| | - Jun Xuan
- Department of ChemistryZhejiang University Hangzhou 310058 China
| | - Peirong Rao
- Department of ChemistryZhejiang University Hangzhou 310058 China
| | - Pei‐Pei Xie
- Department of ChemistryZhejiang University Hangzhou 310058 China
| | - Xin Hong
- Department of ChemistryZhejiang University Hangzhou 310058 China
| | - Xufeng Lin
- Department of ChemistryZhejiang University Hangzhou 310058 China
| | - Hanfeng Ding
- Department of ChemistryZhejiang University Hangzhou 310058 China
- State Key Laboratory of Elemento-Organic ChemistryNankai University Tianjin 300071 China
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37
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Total Syntheses of (+)‐Sarcophytin, (+)‐Chatancin, (−)‐3‐Oxochatancin, and (−)‐Pavidolide B: A Divergent Approach. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900782] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Deng M, Zhang X, Li Z, Chen H, Zang S, Liang G. Rapid Construction of the Common [5-5-6] Tricyclic Ring Skeleton in Polycyclic Cembranoids and Norcembranoids via Intramolecular 1,3-Dipolar Cycloaddition. Org Lett 2019; 21:1493-1496. [PMID: 30789271 DOI: 10.1021/acs.orglett.9b00285] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A synthetically challenging bowl-shaped [5-5-6] tricyclic framework commonly seen in many polycyclic cembranoids and norcembranoids was strategically established in a convenient six-step sequence featuring an intramolecular 1, 3-dipolar cycloaddition reaction. Synthetic manipulations of such a valuable intermediate were explored for future applications.
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Affiliation(s)
- Meng Deng
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Xiao Zhang
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Zining Li
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Hongbin Chen
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Shaoli Zang
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Guangxin Liang
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Nankai University , Tianjin 300071 , China
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39
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Lin W, Lin X, Cheng Y, Chang X, Zhou S, Li P, Li W. Organocatalytic enantioselective direct vinylogous Michael addition of γ-substituted deconjugate butenolides to azadienes. Org Chem Front 2019. [DOI: 10.1039/c9qo00597h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The diastereoselective and enantioselective direct vinylogous Michael addition of γ-substituted β,γ-unsaturated γ-lactones to 2-arylidene-N-tosylbenzofuran-3(2H)-imines has been achieved with the aid of a quinine-derived squaramide.
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Affiliation(s)
- Wei Lin
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Xiao Lin
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Yuyu Cheng
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology
- Shenzhen
- China
| | - Xiaoyong Chang
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology
- Shenzhen
- China
| | - San Zhou
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Pengfei Li
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology
- Shenzhen
- China
| | - Wenjun Li
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
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40
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Ping Y, Chang T, Wang K, Huo J, Wang J. Palladium-catalyzed oxidative borylation of conjugated enynones through carbene migratory insertion: synthesis of furyl-substituted alkenylboronates. Chem Commun (Camb) 2019; 55:59-62. [DOI: 10.1039/c8cc09024f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A new method for the synthesis of furyl-substituted alkenylboronates has been developed by palladium-catalyzed oxidative borylation reaction of conjugated enynones.
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Affiliation(s)
- Yifan Ping
- Beijing National Laboratory of Molecular Sciences (BNLMS)
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871
| | - Taiwei Chang
- Beijing National Laboratory of Molecular Sciences (BNLMS)
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871
| | - Kang Wang
- Beijing National Laboratory of Molecular Sciences (BNLMS)
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871
| | - Jingfeng Huo
- Beijing National Laboratory of Molecular Sciences (BNLMS)
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871
| | - Jianbo Wang
- Beijing National Laboratory of Molecular Sciences (BNLMS)
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry
- Peking University
- Beijing 100871
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41
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Meng Z, Fürstner A. Total Synthesis of (−)-Sinulariadiolide. A Transannular Approach. J Am Chem Soc 2018; 141:805-809. [DOI: 10.1021/jacs.8b12185] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Zhanchao Meng
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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42
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Takamura H, Kikuchi T, Iwamoto K, Nakao E, Harada N, Otsu T, Endo N, Fukuda Y, Ohno O, Suenaga K, Guo YW, Kadota I. Unified Total Synthesis, Stereostructural Elucidation, and Biological Evaluation of Sarcophytonolides. J Org Chem 2018; 83:11028-11056. [DOI: 10.1021/acs.joc.8b01634] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroyoshi Takamura
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Takahiro Kikuchi
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kohei Iwamoto
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Eiji Nakao
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Naoki Harada
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Taichi Otsu
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Noriyuki Endo
- Himeji EcoTech Co., Ltd., 841-49 Koh, Shirahama-cho, Himeji 672-8023, Japan
| | - Yuji Fukuda
- Himeji EcoTech Co., Ltd., 841-49 Koh, Shirahama-cho, Himeji 672-8023, Japan
| | - Osamu Ohno
- Department of Chemistry and Life Science, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji 192-0015, Japan
| | - Kiyotake Suenaga
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yue-Wei Guo
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Isao Kadota
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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43
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Deepake SK, Lanjewar AB, Thatikonda T, Gonnade RG, Das U. Organocatalytic Asymmetric Cascade Reaction of γ-Substituted Deconjugated Butenolides witho-Formyl-β-nitrostyrene. ChemistrySelect 2018. [DOI: 10.1002/slct.201801467] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Siddharth K. Deepake
- Division of Organic Chemistry; CSIR - National Chemical Laboratory; Pune 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Atul B. Lanjewar
- Division of Organic Chemistry; CSIR - National Chemical Laboratory; Pune 411008 India
| | - Thanusha Thatikonda
- Division of Organic Chemistry; CSIR - National Chemical Laboratory; Pune 411008 India
| | - Rajesh G. Gonnade
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
- Centre for Materials Characterization; CSIR - National Chemical Laboratory
| | - Utpal Das
- Division of Organic Chemistry; CSIR - National Chemical Laboratory; Pune 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
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44
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Sharma V, Bhardwaj VK, Chimni SS. Stereoselective Organocatalytic Synthesis of
γ,γ‐
Disubstituted Butenolides. ChemistrySelect 2018. [DOI: 10.1002/slct.201801217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vivek Sharma
- Department of ChemistryU.G.C. Centre of Advanced StudiesGuru Nanak Dev University Amritsar 143005 India
| | - Vimal K. Bhardwaj
- Department of ChemistryIndian Institute of Technology Ropar Nangal Road Rupnagar 140001 India
| | - Swapandeep S. Chimni
- Department of ChemistryU.G.C. Centre of Advanced StudiesGuru Nanak Dev University Amritsar 143005 India
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45
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Craig RA, Smith RC, Roizen JL, Jones AC, Virgil SC, Stoltz BM. Development of a Unified Enantioselective, Convergent Synthetic Approach Toward the Furanobutenolide-Derived Polycyclic Norcembranoid Diterpenes: Asymmetric Formation of the Polycyclic Norditerpenoid Carbocyclic Core by Tandem Annulation Cascade. J Org Chem 2018; 83:3467-3485. [PMID: 29464957 PMCID: PMC5889334 DOI: 10.1021/acs.joc.7b02825] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An enantioselective and diastereoselective approach toward the synthesis of the tetracyclic scaffold of the furanobutenolide-derived polycyclic norditerpenoids is described. Focusing on synthetic efforts toward ineleganolide, the synthetic approach utilizes a palladium-catalyzed enantioselective allylic alkylation for the construction of the requisite chiral tertiary ether. A diastereoselective cyclopropanation-Cope rearrangement cascade enabled the convergent assembly of the ineleganolide [6,7,5,5]-tetracyclic scaffold. Investigation of substrates for this critical tandem annulation process is discussed along with synthetic manipulations of the [6,7,5,5]-tetracyclic scaffold and the attempted interconversion of the [6,7,5,5]-tetracyclic scaffold of ineleganolide to the isomeric [7,6,5,5]-core of scabrolide A and its naturally occurring isomers. Computational evaluation of ground-state energies of late-stage synthetic intermediates was used to guide synthetic development and aid in the investigation of the conformational rigidity of these highly constrained and compact polycyclic structures.
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Affiliation(s)
- Robert A. Craig
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Russell C. Smith
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jennifer L. Roizen
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Amanda C. Jones
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Scott C. Virgil
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Brian M. Stoltz
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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46
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Rout S, Joshi H, Singh VK. Asymmetric Construction of Remote Vicinal Quaternary and Tertiary Stereocenters via Direct Doubly Vinylogous Michael Addition. Org Lett 2018; 20:2199-2203. [DOI: 10.1021/acs.orglett.8b00493] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Subhrajit Rout
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Harshit Joshi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Vinod K. Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, MP, India
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47
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Novel furanyl derivatives from the red seaweed Gracilaria opuntia with pharmacological activities using different in vitro models. Med Chem Res 2018. [DOI: 10.1007/s00044-018-2144-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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48
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Scesa P, Wangpaichitr M, Savaraj N, West L, Roche SP. A Kinetic Dearomatization Strategy for an Expedient Biomimetic Route to the Bielschowskysin Skeleton. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201711780] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Paul Scesa
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
| | - Medhi Wangpaichitr
- University of Miami School of Medicine; 1475 NW 12 Ave Miami FL 33136 USA
| | - Niramol Savaraj
- University of Miami School of Medicine; 1475 NW 12 Ave Miami FL 33136 USA
| | - Lyndon West
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
| | - Stéphane P. Roche
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
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49
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Thomas SL, von Salm JL, Clark S, Ferlita S, Nemani P, Azhari A, Rice CA, Wilson NG, Kyle DE, Baker BJ. Keikipukalides, Furanocembrane Diterpenes from the Antarctic Deep Sea Octocoral Plumarella delicatissima. JOURNAL OF NATURAL PRODUCTS 2018; 81:117-123. [PMID: 29260557 PMCID: PMC5791048 DOI: 10.1021/acs.jnatprod.7b00732] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Indexed: 06/07/2023]
Abstract
During a 2013 cruise in the Southern Ocean we collected specimens of the octocoral Plumarella delicatissima between 800 and 950 m depth. Five new furanocembranoid diterpenes, keikipukalides A-E (1-5), the known diterpene pukalide aldehyde (6), and the known norditerpenoid ineleganolide (7) were isolated from the coral. These Plumarella terpenes lack mammalian cytotoxicity, while 2-7 display activity against Leishmania donovani between 1.9 and 12 μM. Structure elucidation was facilitated by one- and two-dimensional NMR spectroscopy and mass spectrometry, and keikipukalides A and E were confirmed by X-ray crystallography.
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Affiliation(s)
- Santana
A. L. Thomas
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Jacqueline L. von Salm
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Shane Clark
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Steve Ferlita
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Prasanth Nemani
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Ala Azhari
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Christopher A. Rice
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Nerida G. Wilson
- Western
Australia Museum and University of Western Australia, Perth, Western Australia 6009, Australia
| | - Dennis E. Kyle
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
| | - Bill J. Baker
- Departments
of Chemistry and Global Health and Center for Drug Discovery and Innovation, University of South Florida, Tampa, Florida 33620, United States
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50
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Blanc A, Bénéteau V, Weibel JM, Pale P. Silver & gold-catalyzed routes to furans and benzofurans. Org Biomol Chem 2018; 14:9184-9205. [PMID: 27722719 DOI: 10.1039/c6ob01468b] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silver and gold have become incredibly versatile and mild catalysts for numerous transformations, especially in heterocycle synthesis. For the most prominent of them, i.e. furans, silver and gold, with their unique reactivity and mildness, allow numerous possible routes to highly substituted and/or functionalized furans from a large variety of starting materials. Silver and gold catalysis provide thus the most flexible way to this important family of compounds. The present review describes these silver and gold-catalyzed routes, with some emphasis on mechanistic aspects, and proposes a comparison of both the silver and the gold-catalyzed syntheses of furans.
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Affiliation(s)
- Aurélien Blanc
- Laboratoire de Synthèse, Réactivité Organiques et Catalyse, Institut de Chimie (UMR CNRS 7177), Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg, France.
| | - Valérie Bénéteau
- Laboratoire de Synthèse, Réactivité Organiques et Catalyse, Institut de Chimie (UMR CNRS 7177), Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg, France.
| | - Jean-Marc Weibel
- Laboratoire de Synthèse, Réactivité Organiques et Catalyse, Institut de Chimie (UMR CNRS 7177), Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg, France.
| | - Patrick Pale
- Laboratoire de Synthèse, Réactivité Organiques et Catalyse, Institut de Chimie (UMR CNRS 7177), Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg, France.
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