1
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Jiang HL, Zhang YY, Mao HY, Zhang Y, Cao YX, Yu HY, Dong XY, Tao L, Yang CS. Strophiofimbrins A and B: Two Rearranged Norditerpenoids with Novel Tricyclic Carbon Skeletons from Strophioblachia fimbricalyx. J Org Chem 2023; 88:5936-5943. [PMID: 37043752 DOI: 10.1021/acs.joc.3c00301] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Two rearranged norditerpenoids with novel tricyclic carbon skeletons, strophiofimbrin A (1) and strophiofimbrin B (2), were isolated from Strophioblachia fimbricalyx. Their structures were established by 1D/2D NMR spectroscopy, HRESIMS, quantum chemistry calculations, and X-ray diffraction analyses. 1 and 2 represented the first examples of diterpenoids with unprecedented 5/6/7-fused ring systems. In the proposed biosynthetic pathway, they were suspected to derive from cleistanthane norditerpenoids via ring opening, expansion, cyclization, and rearrangement based on the existence of phenanthrenone and cleistanthane diterpenoids from Strophioblachia and Trigonostemon, two closely related genera of the Euphorbiaceae family. Furthermore, compounds 1 and 2 exhibited significant proliferation inhibition and obvious neuroprotective effects.
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Affiliation(s)
- Hou-Li Jiang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou, Jiangsu 225009, China
- The Key Laboratory of Syndrome Differentiation and Treatment of Gastric Cancer of the State Administration of Traditional Chinese Medicine, Yangzhou, Jiangsu 225009, China
| | - Yan-Yan Zhang
- Testing Center, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Hao-Yu Mao
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yue Zhang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yin-Xue Cao
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Hong-Yan Yu
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Xiao-Yun Dong
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Li Tao
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
- The Key Laboratory of Syndrome Differentiation and Treatment of Gastric Cancer of the State Administration of Traditional Chinese Medicine, Yangzhou, Jiangsu 225009, China
| | - Chang-Shui Yang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225009, China
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou, Jiangsu 225009, China
- The Key Laboratory of Syndrome Differentiation and Treatment of Gastric Cancer of the State Administration of Traditional Chinese Medicine, Yangzhou, Jiangsu 225009, China
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2
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Yang CS, Jiang HL, Mao HY, Zhang Y, Zhang YY, Dong XY. Strophioblin, a novel rearranged dinor-diterpenoid from Strophioblachia fimbricalyx. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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3
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de Souza MM, Chagas LGRD, Gonçalves AE, Tomczak M, Reichert S, Schuquel ITA, Cechinel-Filho V, Meyre-Silva C. Phytochemical Analysis and Antinociceptive Properties of Hydroalcoholic Extracts of Aleurites moluccanus Bark. PLANTA MEDICA 2021; 87:896-906. [PMID: 34034350 DOI: 10.1055/a-1497-0239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Aleurites moluccanus is used in folk medicine to treat many diseases including pain and inflammatory processes in general. Considering the potential of the leaf extract, evidenced in a previous study, the present study investigates the antinociceptive and anti-inflammatory properties of the hydroethanolic extract of A. moluccanus bark and isolated compounds in animal models of pain. The antinociceptive and anti-inflammatory activities of A. moluccanus bark were evaluated through hyperalgesia induced by carrageenan, PGE2, cytokines, bradykinin, epinephrine, Freund's complete adjuvant, and lipopolysaccharide. Five compounds were isolated from the dichloromethane bark extract: acetyl aleuritolic acid, atraric acid, spruceanol, (5β,10α)-12-hydroxy-13-methoxy-8,11,13-podocarpatrien-3-one and sonderianol. To optimize the extraction conditions, ethanol 50, 70, and 90°GL were used as extracting solvent, in a 1 : 20 (w/v) drug : solvent ratio, under stirring at room temperature for 4 h. The extracts were named AMC50, AMC70, and AMC90, respectively. These extracts were administered to mice (250 mg/kg, p. o.) with reduced mechanical hyperalgesia activity in the carrageenan test. Of these, AMC90 showed the best results. Pure (5β,10α)-12-hydroxy-13-methoxy-8,11,13-podocarpatrien-3-one showed a beneficial effect for up to 48 hours after the administration of carrageenan, while acetyl aleuritolic acid was effective only in the first hour. AMC90 was able to reverse the analgesia induced only by prostaglandin E2 and tumor necrosis factor. We also induced hyperalgesia using the lipopolysaccharide and Freund's complete adjuvant models, with positive results. These results support the antinociceptive and anti-inflammatory activity of A. moluccanus bark extract. The observed effects are partly due to the presence of acetyl aleuritolic acid, atraric acid, and (5β,10α)-12-hydroxy-13-methoxy-8,11,13-podocarpatrien-3-one.
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Affiliation(s)
- Márcia Maria de Souza
- Universidade do Vale do Itajaí (UNIVALI), Escola de Ciências da Saúde, Itajaí, Santa Catarina State, Brazil
| | - Luiz G R D Chagas
- Universidade do Vale do Itajaí (UNIVALI), Escola de Ciências da Saúde, Itajaí, Santa Catarina State, Brazil
| | - Ana Elisa Gonçalves
- Universidade do Vale do Itajaí (UNIVALI), Escola de Ciências da Saúde, Itajaí, Santa Catarina State, Brazil
| | - Marcelo Tomczak
- Universidade do Vale do Itajaí (UNIVALI), Escola de Ciências da Saúde, Itajaí, Santa Catarina State, Brazil
| | - Simone Reichert
- Universidade do Vale do Itajaí (UNIVALI), Escola de Ciências da Saúde, Itajaí, Santa Catarina State, Brazil
| | - Ivania T A Schuquel
- Universidade Estadual de Maringá (UEM), Departamento de Química, Maringá, Paraná State, Brazil
| | - Valdir Cechinel-Filho
- Universidade do Vale do Itajaí (UNIVALI), Escola de Ciências da Saúde, Itajaí, Santa Catarina State, Brazil
| | - Christiane Meyre-Silva
- Pós-graduação em Farmácia. Universidade Federal de Santa Catarina (UFSC), Bloco JK, Campus Reitor João David Ferreira Lima, Trindade, Florianópolis, Santa Catarina State, Brazil
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4
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Dembitsky VM, Ermolenko E, Savidov N, Gloriozova TA, Poroikov VV. Antiprotozoal and Antitumor Activity of Natural Polycyclic Endoperoxides: Origin, Structures and Biological Activity. Molecules 2021; 26:686. [PMID: 33525706 PMCID: PMC7865715 DOI: 10.3390/molecules26030686] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/20/2021] [Accepted: 01/25/2021] [Indexed: 02/08/2023] Open
Abstract
Polycyclic endoperoxides are rare natural metabolites found and isolated in plants, fungi, and marine invertebrates. The purpose of this review is a comparative analysis of the pharmacological potential of these natural products. According to PASS (Prediction of Activity Spectra for Substances) estimates, they are more likely to exhibit antiprotozoal and antitumor properties. Some of them are now widely used in clinical medicine. All polycyclic endoperoxides presented in this article demonstrate antiprotozoal activity and can be divided into three groups. The third group includes endoperoxides, which show weak antiprotozoal activity with a reliability of up to 70%, and this group includes only 1.1% of metabolites. The second group includes the largest number of endoperoxides, which are 65% and show average antiprotozoal activity with a confidence level of 70 to 90%. Lastly, the third group includes endoperoxides, which are 33.9% and show strong antiprotozoal activity with a confidence level of 90 to 99.6%. Interestingly, artemisinin and its analogs show strong antiprotozoal activity with 79 to 99.6% confidence against obligate intracellular parasites which belong to the genera Plasmodium, Toxoplasma, Leishmania, and Coccidia. In addition to antiprotozoal activities, polycyclic endoperoxides show antitumor activity in the proportion: 4.6% show weak activity with a reliability of up to 70%, 65.6% show an average activity with a reliability of 70 to 90%, and 29.8% show strong activity with a reliability of 90 to 98.3%. It should also be noted that some polycyclic endoperoxides, in addition to antiprotozoal and antitumor properties, show other strong activities with a confidence level of 90 to 97%. These include antifungal activity against the genera Aspergillus, Candida, and Cryptococcus, as well as anti-inflammatory activity. This review provides insights on further utilization of polycyclic endoperoxides by medicinal chemists, pharmacologists, and the pharmaceutical industry.
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Affiliation(s)
- Valery M. Dembitsky
- Centre for Applied Research, Innovation and Entrepreneurship, Lethbridge College, 3000 College Drive South, Lethbridge, AB T1K 1L6, Canada;
- A.V. Zhirmunsky National Scientific Center of Marine Biology, 17 Palchevsky Str., 690041 Vladivostok, Russia;
| | - Ekaterina Ermolenko
- A.V. Zhirmunsky National Scientific Center of Marine Biology, 17 Palchevsky Str., 690041 Vladivostok, Russia;
| | - Nick Savidov
- Centre for Applied Research, Innovation and Entrepreneurship, Lethbridge College, 3000 College Drive South, Lethbridge, AB T1K 1L6, Canada;
| | - Tatyana A. Gloriozova
- Institute of Biomedical Chemistry, 10 Pogodinskaya Str., 119121 Moscow, Russia; (T.A.G.); (V.V.P.)
| | - Vladimir V. Poroikov
- Institute of Biomedical Chemistry, 10 Pogodinskaya Str., 119121 Moscow, Russia; (T.A.G.); (V.V.P.)
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5
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Ban NK, Linh TM, Mai NC, Tai BH, Nhiem NX, Hoang NH, Kiem PV. New 3,4 -seco-diterpene and coumarin derivative from the leaves of Trigonostemon flavidus Gagnep. Nat Prod Res 2020; 36:3247-3254. [PMID: 33249875 DOI: 10.1080/14786419.2020.1851225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Two new compounds named trigoflavidus A (1) and trigoflavidus B (2), and eight known compounds, trigoflavidone (3), heterophypene (4), howpene C (5), 3,4-seco-sonderianol (6), trigonochinene C (7), fraxidin (8), isofraxidin (9), and isofraxetin (10) were isolated from the leaves of Trigonostemon flavidus Gagnep. by various chromatographic methods. Their chemical structures were elucidated via UV, IR, HR-ESI-MS and NMR spectroscopic methods and divided into two groups including six 3,4-seco-diterpenes (1, 3-7) and four coumarins (2, 8-10). Absolute configurations at stereocenters of compound 1 were confirmed by comparison of its CD spectra with those of the TD-DFT calculations. At a concentration of 30 µM, compounds 1-10 exhibited weak cytotoxic activity toward LU1, HepG2, MCF7, and SKMel2 human cell lines (cell viability all over 50%).
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Affiliation(s)
- Ninh Khac Ban
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam.,Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
| | - Tran My Linh
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
| | - Nguyen Chi Mai
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
| | - Bui Huu Tai
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam.,Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
| | - Nguyen Xuan Nhiem
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam.,Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
| | - Nguyen Huy Hoang
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
| | - Phan Van Kiem
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam.,Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Viet Nam
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6
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Chang FR, Wang SW, Chen SR, Lee CY, Sheu JH, Cheng YB. Aleuritin, a novel dinor-diterpenoid from the twigs of Aleurites moluccanus with an anti-lymphangiogenic effect. Org Biomol Chem 2020; 18:7892-7898. [PMID: 32996532 DOI: 10.1039/d0ob01527j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A phytochemical investigation of Aleurites moluccanus yielded one novel dinor-diterpenoid, aleuritin (1), along with a rare diterpenoid, aleuritone (2). Compound 1 has an unprecedented skeleton with a 6/6/5-fused tricyclic ring system. Compound 2 possesses a rare 6/6/5/3-fused tetracyclic skeleton, which is probably an artifact formed photochemically by the Norrish reaction. The structures of 1 and 2 were determined by spectroscopic methods (ECD, IR, mass, and NMR) and confirmed by single-crystal X-ray diffraction analyses. A plausible biogenetic pathway of 1 is proposed. Pharmacological study showed that these two compounds possessed mild in vitro anti-lymphangiogenic activity, which suppressed tube formation with IC50 values of 48.1 ± 1.8 and 34.2 ± 0.8 μg mL-1, respectively.
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Affiliation(s)
- Fang-Rong Chang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
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7
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Maslovskaya LA, Savchenko AI, Krenske EH, Chow S, Holt T, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Boyle GM, Kutateladze AG, Williams CM. EBC-232 and 323: A Structural Conundrum Necessitating Unification of Five In Silico Prediction and Elucidation Methods. Chemistry 2020; 26:11862-11867. [PMID: 32864777 DOI: 10.1002/chem.202001884] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/08/2020] [Indexed: 12/12/2022]
Abstract
Structurally unique halimanes EBC-232 and EBC-323, isolated from the Australian rainforest plant Croton insularis, proved considerably difficult to elucidate. The two diastereomers, which consist an unusual oxo-6,7-spiro ring system fused to a dihydrofuran, were solved by unification and consultation of five in silico NMR elucidation and prediction methods [i.e., ACDLabs, olefin strain energy (OSE), DP4, DU8+ and TD DFT CD]. Structure elucidation challenges of this nature are prime test case examples for empowering future AI learning in structure elucidation.
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Affiliation(s)
- Lidia A Maslovskaya
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia.,QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Andrei I Savchenko
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Sharon Chow
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Tina Holt
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, 80208, USA
| | - Victoria A Gordon
- EcoBiotics Limited, PO Box 1, Yungaburra, 4884, Queensland, Australia
| | - Paul W Reddell
- EcoBiotics Limited, PO Box 1, Yungaburra, 4884, Queensland, Australia
| | - Carly J Pierce
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Peter G Parsons
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Glen M Boyle
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Andrei G Kutateladze
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, 80208, USA
| | - Craig M Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
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8
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Sikorsky TV, Ermolenko EV, Gloriozova TA, Dembitsky VM. Mini Review: Anticancer activity of diterpenoid peroxides. VIETNAM JOURNAL OF CHEMISTRY 2020. [DOI: 10.1002/vjch.202000014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Tatyana V. Sikorsky
- A. V. Zhirmunsky National Scientific Center of Marine Biology; Vladivostok 690041 Russia
| | - Ekaterina V. Ermolenko
- A. V. Zhirmunsky National Scientific Center of Marine Biology; Vladivostok 690041 Russia
| | | | - Valery M. Dembitsky
- Centre for Applied Research, Innovation and Entrepreneurship, Lethbridge College; 3000 College Drive South Lethbridge Canada AB T1K 1L6
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9
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Maslovskaya LA, Savchenko AI, Krenske EH, Chow S, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Boyle GM, Williams CM. EBC-342: A Novel Tetrahydrofuran Moiety Containing Casbane from the Australian Rainforest. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lidia A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Elizabeth H. Krenske
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Sharon Chow
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited; PO Box 1 4884 Yungaburra Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
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10
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Tan YP, Xue Y, Savchenko AI, Houston SD, Modhiran N, McMillan CLD, Boyle GM, Bernhardt PV, Young PR, Watterson D, Williams CM. Basimarols A, B, and C, Highly Oxygenated Pimarane Diterpenoids from Basilicum polystachyon. JOURNAL OF NATURAL PRODUCTS 2019; 82:2828-2834. [PMID: 31553187 DOI: 10.1021/acs.jnatprod.9b00522] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The highly oxygenated pimarane diterpenoids basimarols A, B, and C (3-5) were isolated from the plant species Basilicum polystachyon, which was collected within the Australian arid zone. Structure elucidation was performed using a suite of spectroscopic techniques, including X-ray crystallography. Anticancer and anti-DENV activity of 3-5 was explored, but only limited activity was observed. More extensive antiviral evaluation of stachyonic acid A (1), which was also isolated from B. polystachyon, revealed broad spectrum antiviral activity against West Nile virus (Kunjin strain, WNVKun) and human influenza viruses H1N1 and H3N2.
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Affiliation(s)
| | - Yongbo Xue
- School of Pharmaceutical Sciences (Shenzhen) , Sun Yat-Sen University , Guangzhou , 510275 , People's Republic of China
| | | | | | | | | | - Glen M Boyle
- QIMR Berghofer Medical Research Institute , PO Royal Brisbane Hospital, Brisbane , 4029 , Queensland , Australia
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11
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Kato H, Sebe M, Nagaki M, Eguchi K, Kagiyama I, Hitora Y, Frisvad JC, Williams RM, Tsukamoto S. Taichunins A-D, Norditerpenes from Aspergillus taichungensis (IBT 19404). JOURNAL OF NATURAL PRODUCTS 2019; 82:1377-1381. [PMID: 30995043 DOI: 10.1021/acs.jnatprod.8b01032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Four new norditerpenes, taichunins A-D (1-4), were isolated from the fungus Aspergillus taichungensis (IBT 19404). Compound 1 has a new carbon framework. The absolute configurations were determined by the calculated ECD spectral method. Compound 1 was cytotoxic against HeLa cells with an IC50 value of 4.5 μM, whereas 2-4 were nontoxic at 50 μM.
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Affiliation(s)
- Hikaru Kato
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
| | - Momona Sebe
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
| | - Mika Nagaki
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
| | - Keisuke Eguchi
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
| | - Ippei Kagiyama
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
| | - Yuki Hitora
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
| | - Jens C Frisvad
- Section for Eukaryotic Biotechnology, Departments of System Biology , Technical University of Denmark , Building 221, 2800 Kongens Lyngby , Denmark
| | - Robert M Williams
- Department of Chemistry , Colorado State University , 301 West Pitkin Street , Fort Collins , Colorado 80523 , United States
- University of Colorado Cancer Center , Aurora , Colorado 80045 , United States
| | - Sachiko Tsukamoto
- Graduate School of Pharmaceutical Sciences , Kumamoto University , 5-1 Oe-honmachi , Kumamoto 862-0973 , Japan
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12
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Boyle GM, Parsons PG, Williams CM. New Halimanes from the Australian Rainforest Plant Croton Insularis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801548] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lidia A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of; 4072 Brisbane Queensland Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of; 4072 Brisbane Queensland Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited; PO Box 1 4884 Yungaburra Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of; 4072 Brisbane Queensland Australia
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13
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Maslovskaya LA, Savchenko AI, Pierce CJ, Boyle GM, Gordon VA, Reddell PW, Parsons PG, Williams CM. New Casbanes and the First trans
-Cyclopropane seco
-Casbane from the Australian Rainforest Plant Croton insularis. Chemistry 2019; 25:1525-1534. [DOI: 10.1002/chem.201804904] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/28/2018] [Indexed: 01/30/2023]
Affiliation(s)
- Lidiya A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Queensland Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited; P.O. Box 1 Yungaburra 4884 Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Queensland Australia
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14
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Chemical Constituents from Croton Species and Their Biological Activities. Molecules 2018; 23:molecules23092333. [PMID: 30213129 PMCID: PMC6225158 DOI: 10.3390/molecules23092333] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/07/2018] [Accepted: 09/10/2018] [Indexed: 12/12/2022] Open
Abstract
The genus Croton belongs to the Euphorbiaceae family, which comprises approximately 1300 species. Many Croton species have been used as folk medicines. This review focuses on the chemical constituents from Croton species and their relevant biological activities, covering the period from 2006 to 2018. A total of 399 new compounds, including 339 diterpenoids, were reported. Diterpenoids are characteristic components of the Croton species. These isolated compounds exhibited a broad spectrum of bioactivities, including cytotoxic, anti-inflammatory, antifungal, acetylcholinesterase inhibitory, and neurite outgrowth-promoting properties. The present review provides a significant clue for further research of the chemical constituents from the Croton species as potential medicines.
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15
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Phenylacetylene-bearing 3,4-seco-cleistanthane diterpenoids from the roots of Phyllanthus glaucus. Fitoterapia 2018; 128:79-85. [DOI: 10.1016/j.fitote.2018.05.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/04/2018] [Accepted: 05/12/2018] [Indexed: 11/21/2022]
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16
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Vanden Berg TJ, Pinkerton DM, Williams CM. 7-Step total synthesis of (+)-EBC-329: Photoisomerisation reveals new seco-casbane family member. Org Biomol Chem 2018; 15:7102-7105. [PMID: 28820535 DOI: 10.1039/c7ob01400g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first seco-casbane, EBC-329, isolated from the Australian rainforest, was synthesised from (+)-2-carene in seven steps. This endeavour not only established the absolute stereochemical assignment as (8R,9S)-EBC-329, but also identified, via photoisomerisation, a new seco-casbane family member.
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Affiliation(s)
- Timothy J Vanden Berg
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia.
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17
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18
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Tan YP, Savchenko AI, Broit N, Boyle GM, Parsons PG, Williams CM. The First Plant 5,6-Secosteroid from the Australian Arid Zone SpeciesFrankenia foliosa. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuen P. Tan
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Natasa Broit
- PO Royal Brisbane Hospital; QIMR Berghofer Medical Research Institute; 4029 Brisbane Queensland Australia
| | - Glen M. Boyle
- PO Royal Brisbane Hospital; QIMR Berghofer Medical Research Institute; 4029 Brisbane Queensland Australia
| | - Peter G. Parsons
- PO Royal Brisbane Hospital; QIMR Berghofer Medical Research Institute; 4029 Brisbane Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
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19
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Gan K, Tang W, Zhu T, Li W, Wang H, Liu X. Enhanced extraction of cleistanthol from Phyllanthus flexuosus by deep eutectic solvent-modified anion-exchange resin. J LIQ CHROMATOGR R T 2017. [DOI: 10.1080/10826076.2017.1278609] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Kunrong Gan
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, P. R. China
| | - Weiyang Tang
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, P. R. China
| | - Tao Zhu
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, P. R. China
| | - Wei Li
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, P. R. China
| | - Hongying Wang
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, P. R. China
| | - Xiujie Liu
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, P. R. China
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20
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Williams CM. The First Casbane Hydroperoxides EBC-304 and EBC-320 from the Australian Rainforest. Chemistry 2016; 23:537-540. [DOI: 10.1002/chem.201604674] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Indexed: 01/30/2023]
Affiliation(s)
- Lidiya A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; Brisbane 4029, Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited, PO Box 1; Yungaburra 4884, Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; Brisbane 4029, Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; Brisbane 4029, Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Australia
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21
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Tejedor D, Delgado-Hernández S, Ingold M, García-Tellado F. Synthesis of α-Quaternized 2,4-Cyclohexadienones from Propargyl Vinyl Ethers. J Org Chem 2016; 81:10099-10105. [PMID: 27709940 DOI: 10.1021/acs.joc.6b02137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A microwave-assisted and base-catalyzed domino manifold to construct 2,4-cyclohexadienone derivatives has been implemented. The domino manifold uses easily accessible tertiary propargyl vinyl ethers bearing a methine group at the homopropargylic position and imidazole as the catalyst to deliver 2,4-cyclohexadienones featuring a key formyl group and a quaternized carbon atom in good yields.
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Affiliation(s)
- David Tejedor
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Astrofísico Francisco Sánchez 3, 38 206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Samuel Delgado-Hernández
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Astrofísico Francisco Sánchez 3, 38 206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Mariana Ingold
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Astrofísico Francisco Sánchez 3, 38 206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Fernando García-Tellado
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Astrofísico Francisco Sánchez 3, 38 206 La Laguna, Tenerife, Islas Canarias, Spain
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Williams CM. seco-Casbanes from the Australian Rainforest: ECD Predictions Key for Determining Remote Absolute Configuration. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501605] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Williams CM. EBC-318 and 339: bicyclo[10.2.1]alkanes from Croton insularis. RSC Adv 2016. [DOI: 10.1039/c6ra02599d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
EBC-318 and EBC-339 were isolated from Croton insularis, an Australian rain forest plant. EBC-318 is characterised by a bridgehead double bond.
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Affiliation(s)
- Lidia A. Maslovskaya
- QIMR Berghofer Medical Research Institute
- PO Royal Brisbane Hospital
- Brisbane
- Australia
- School of Chemistry and Molecular Biosciences
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences
- University of Queensland
- Brisbane
- Australia
| | | | | | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute
- PO Royal Brisbane Hospital
- Brisbane
- Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute
- PO Royal Brisbane Hospital
- Brisbane
- Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences
- University of Queensland
- Brisbane
- Australia
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Williams CM. EBC-316, 325–327, and 345: New Pimarane Diterpenes from Croton insularis Found in the Australian Rainforest. Aust J Chem 2015. [DOI: 10.1071/ch14550] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Five new pimarane and related-type diterpenes (i.e. EBC-316, 325–327, and 345 (10–15)), together with two known pimaranes (EBC-221 (8) and EBC-346 (9)), were isolated from the stems of Croton insularis, found in the Australian rainforest. All pimarane diterpenes disclosed herein are suggested to be biogenetically related to the same keto-Jacobs–Reynolds intermediate 2, via ring A and C oxidation. Anticancer activities of compounds 11–13 are reported.
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Lv JJ, Yu S, Xin Y, Zhu HT, Wang D, Cheng RR, Yang CR, Xu M, Zhang YJ. Stereochemistry of cleistanthane diterpenoid glucosides from Phyllanthus emblica. RSC Adv 2015. [DOI: 10.1039/c4ra16624h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Theoretical calculated electronic circular dichroism and Mosher’s method were applied to elucidate the stereochemistry of cleistanthane diterpenoids.
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Affiliation(s)
- Jun-Jiang Lv
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Shan Yu
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Ying Xin
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Hong-Tao Zhu
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Dong Wang
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Rong-Rong Cheng
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Chong-Ren Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Min Xu
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
| | - Ying-Jun Zhang
- State Key Laboratory of Phytochemistry and Plant Resources in West China
- Kunming Institute of Botany
- Chinese Academy of Sciences
- Kunming 650201
- People’s Republic of China
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Su D, Yang XY, Feng X, Shang MY, Cai SQ. The diterpenes ovoideal A-G from Tirpitzia ovoidea. Molecules 2014; 19:18966-79. [PMID: 25412043 PMCID: PMC6270903 DOI: 10.3390/molecules191118966] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 11/04/2014] [Accepted: 11/05/2014] [Indexed: 11/16/2022] Open
Abstract
Seven new diterpenes, named ovoideal A (1), B (2), C (3), D (4), E (5), F (6) and G (7), have been isolated along with eleven known diterpenes 8-18 from the petroleum ether soluble fraction of an ethanol extract of the aerial parts of Tirpitzia ovoidea. The structures of the new compounds were elucidated primarily by 1D and 2D NMR spectroscopy, as well as by the HR-ESI-MS spectrometry. All compounds were isolated from the Linaceae family for the first time. The in vitro cytotoxic activity of compounds 1, 3-5, 8-18 was evaluated against the Hela, HepG2 and K562 cell lines. Among them, compounds 3, 9, 11, 12, 13, 14, 15, 17, 18 showed moderate inhibitory activities.
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Affiliation(s)
- Dan Su
- Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Xueyuan Road, Beijing 100191, China.
| | - Xue-Yan Yang
- Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Xueyuan Road, Beijing 100191, China.
| | - Xu Feng
- Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Xueyuan Road, Beijing 100191, China.
| | - Ming-Ying Shang
- Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Xueyuan Road, Beijing 100191, China.
| | - Shao-Qing Cai
- Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Xueyuan Road, Beijing 100191, China.
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Mak JYW, Pouwer RH, Williams CM. Naturstoffe mit Anti-Bredt- und Brückenkopf-Doppelbindung. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400932] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Mak JYW, Pouwer RH, Williams CM. Natural products with anti-Bredt and bridgehead double bonds. Angew Chem Int Ed Engl 2014; 53:13664-88. [PMID: 25399486 DOI: 10.1002/anie.201400932] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 04/25/2014] [Indexed: 11/11/2022]
Abstract
Well over a hundred years ago, Professor Julius Bredt embarked on a career pursuing and critiquing bridged bicyclic systems that contained ring strain induced by the presence of a bridgehead olefin. These endeavors founded what we now know as Bredt's rule (Bredtsche Regel). Physical, theoretical, and synthetic organic chemists have intensely studied this premise, pushing the boundaries of such systems to arrive at a better understood physical phenomenon. Mother nature has also seen fit to construct molecules containing bridgehead double bonds that encompass Bredt's rule. For the first time, this topic is reviewed in a natural product context.
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Affiliation(s)
- Jeffrey Y W Mak
- Institute for Molecular Bioscience, The University of Queensland, Brisbane (Australia)
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Maslovskaya LA, Savchenko AI, Pierce CJ, Gordon VA, Reddell PW, Parsons PG, Williams CM. Unprecedented 1,14-seco-crotofolanes from Croton insularis: oxidative cleavage of crotofolin C by a putative homo-Baeyer-Villiger rearrangement. Chemistry 2014; 20:14226-30. [PMID: 25233878 DOI: 10.1002/chem.201404250] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Indexed: 01/30/2023]
Abstract
EBC-162 isolated from Croton insularis, obtained from the northern rainforest of Australia, was structurally affirmed as crotofolin C (4). Novel oxidative degradation products, EBC-233 and EBC-300, which are the first crotofolane endoperoxides, were also isolated. Both endoperoxides were found to be stable intermediates, which are proposed to undergo an unprecedented homo-Baeyer-Villiger biosynthetic rearrangement to give a new class of 1,14-seco-crotofolane diterpenes. Prolonged storage of all isolates assisted in authenticating their natural product status. Anticancer activities of reported compounds are presented.
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Affiliation(s)
- Lidiya A Maslovskaya
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Queensland (Australia)
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Maslovskaya LA, Savchenko AI, Krenske EH, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Williams CM. Croton insularis introduces the seco-casbane class with EBC-329 and the first casbane endoperoxide EBC-324. Chem Commun (Camb) 2014; 50:12315-7. [DOI: 10.1039/c4cc05413j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Maslovskaya LA, Savchenko AI, Krenske EH, Pierce CJ, Gordon VA, Reddell PW, Parsons PG, Williams CM. EBC-219: A New Diterpene Skeleton, Crotinsulidane, from the Australian Rainforest Containing a Bridgehead Double Bond. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310923] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Maslovskaya LA, Savchenko AI, Krenske EH, Pierce CJ, Gordon VA, Reddell PW, Parsons PG, Williams CM. EBC-219: A New Diterpene Skeleton, Crotinsulidane, from the Australian Rainforest Containing a Bridgehead Double Bond. Angew Chem Int Ed Engl 2014; 53:7006-9. [DOI: 10.1002/anie.201310923] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Indexed: 12/12/2022]
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Zhao JQ, Lv JJ, Wang YM, Xu M, Zhu HT, Wang D, Yang CR, Wang YF, Zhang YJ. Phyllanflexoid C: first example of phenylacetylene-bearing 18-nor-diterpenoid glycoside from the roots of Phyllanthus flexuosus. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.06.082] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Tang GH, He HP, Gu YC, Di YT, Wang YH, Li SF, Li SL, Zhang Y, Hao XJ. 3,4-seco-Diterpenoids from Trigonostemon flavidus. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.09.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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