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Xu M, Liu J, Sun W, Chen Y, Wang M, Zhou Y. New dammarane-type triterpenoids from the whole plant of Euphorbia hypericifolia. Nat Prod Res 2024:1-6. [PMID: 38419300 DOI: 10.1080/14786419.2024.2324106] [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: 11/06/2023] [Accepted: 02/20/2024] [Indexed: 03/02/2024]
Abstract
Euphorhypenoids A (1) and B (2), two new dammarane-type triterpenoids, along with four known tetracyclic triterpenoids (3-6), were isolated from the whole plant of Euphorbia hypericifolia. The structures of new compounds were mainly elucidated by a series of extensive spectroscopic methods, including HR-ESI-MS, NMR, IR, and UV. Compound 1 exhibited significant inhibitory effect on platelet aggregation at concentrations of 10 - 200 µM.
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Affiliation(s)
- Mengke Xu
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jiacheng Liu
- Department of Pharmacology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - Wenrui Sun
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yutian Chen
- The Department of Endovascular Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Mengyu Wang
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yangfan Zhou
- Department of Cardiology, Cardiovascular Center, Henan Key Laboratory of Hereditary Cardiovascular Diseases, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Fang CH, Li YP, Li Y, Yue JM, Bao J, Yu JH. Triterpenoids with multi-skeletons as 11 β -HSD1 inhibitors from Euphorbia sikkimensis. PHYTOCHEMISTRY 2023; 211:113684. [PMID: 37105350 DOI: 10.1016/j.phytochem.2023.113684] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 04/14/2023] [Accepted: 04/18/2023] [Indexed: 05/27/2023]
Abstract
An exploration for 11β-HSD1 inhibitors from the whole plant of Euphorbia sikkimensis led to the identification of 10 undescribed triterpenoids 1-10, as well as 7 known triterpenoids (11-17). Their structures were determined by a combination of spectrum elucidations, conformational analyses and quantum chemical calculations. (23E)-25-methoxy-eupha-14,23-diene-3β,7α-diol (1) and (23E)-3β-dihydroxy-27-noreupha-7,23-diene-25-one (2) are two rare cases that feature a rearrangement of Me-30 (14 → 8) and a degradation of Me-27, respectively, in the euphane-type triterpenoid family. It is an interesting phenomenon that (23E)-3β-hydroxy-25-methoxy-eupha-8,23-diene-7-one (4) and (23E)-3β-hydroxy-25-methoxy-lanost-8,23-diene-7-one (5) coexist in the same plant, sharing the same planar structure but belonging to different structural types of triterpenoids. Compounds 3-5 and 14 show significant inhibitory activity against 11β-HSD1 with IC50 values of 6.50 ± 0.22, 1.31 ± 0.34, 9.38 ± 0.64, and 8.27 ± 0.33 μM, respectively. The structure-activity relationship study shows that the euphane-type triterpenoids exhibit the best inhibitory activity, which is in accord with the fact of the euphane-type triterpenoids having the best ability to bind to the active pocket of 11β-HSD1 in the molecular docking experiments.
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Affiliation(s)
- Chu-Hong Fang
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong, 264117, China; School of Biological Science and Technology, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan, 250022, China
| | - Yu-Peng Li
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong, 264117, China
| | - Ying Li
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong, 264117, China
| | - Jian-Min Yue
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong, 264117, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, 201203, China
| | - Jie Bao
- School of Biological Science and Technology, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan, 250022, China.
| | - Jin-Hai Yu
- Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong, 264117, China.
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Li JC, Li SY, Tang JX, Liu D, Feng XY, Rao KR, Zhao XD, Li HM, Li RT. Triterpenoids, steroids and other constituents from Euphorbia kansui and their anti-inflammatory and anti-tumor properties. PHYTOCHEMISTRY 2022; 204:113449. [PMID: 36170888 DOI: 10.1016/j.phytochem.2022.113449] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 09/17/2022] [Accepted: 09/18/2022] [Indexed: 06/16/2023]
Abstract
Six undescribed triterpenoids (euphokanols A-F), two undescribed C21-steroidal glycosides (euphokanosides A and B), together with fifty-four known compounds were isolated from the roots of Euphorbia kansui. Their structures were demonstrated by extensive spectroscopic data (1D, 2D NMR and HR-ESI-MS), and the absolute configuration of euphokanol A was elucidated based on electronic circular dichroism (ECD) calculation. Among them, euphokanol A was a tetracyclic triterpenoid with a 5,10-epoxy moiety and concurrent rearrangement of Me-19(10 → 9) and Me-30 (14 → 8), while euphokanols B and C were rare 19(10 → 9) abeo-tirucallane-type triterpenoids with Δ5(10) double bonds and 7,8-epoxy moieties. In addition, ten C21-steroidal glycosides were isolated from Euphorbia plants for the first time. Moreover, cynotophylloside B, caudatin, 5α,8α-epidioxy-22E-ergosta-6,22-diene-3β-ol, 6β,7β-epoxy-3β,4β,5β-trihydroxyl-20-deoxyingenol, 13-hydroxyingenol-3-(2,3- dimethylbutanoate)-13-dodecanoate, ingenol, 3-O-benzoyl-13-O-dodecanoateingenol, 3-O-(2'E,4'Z-decadienoyl)-20-O-acetylingenol, 20-O-acetylingenol and 20- deoxyingenol exhibited significant inhibition on NO production with IC50 values of 9.10, 17.38, 1.71, 0.55, 0.57, 12.22, 0.56, 0.30, 11.21 and 2.98 μM, respectively. Furthermore, wilfoside KIN, cynsaccatol L, kanesulone A, and 3β,7β,15β-triacetyloxy-5α-benzoyloxy-2α,8α-dihydroxyjatropha-6(17),11E-diene-9, 14-dione showed cytotoxicity against HepG2 cell line, with IC50 values of 12.55, 12.61, 18.24 and 18.26 μM, respectively. 13-Hydroxyingenol-3-(2,3-dimethylbutanoate)-13- dodecanoate exhibited anti-proliferation activity on MCF-7 cell line with an IC50 value of 17.12 μM. Specifically, euphol selectively inhibited the growth of human glioma stem cells (GSC-3# and GSC-12#), with IC50 values of 8.89 and 13.00 μM, respectively.
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Affiliation(s)
- Jian-Chun Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Shu-Yi Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Jian-Xian Tang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Dan Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Xiao-Yi Feng
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Kai-Rui Rao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Xu-Dong Zhao
- Laboratory of Animal Tumor Models, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, PR China
| | - Hong-Mei Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China.
| | - Rong-Tao Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China.
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Wang Y, Chen G, Meng Q, Yao X, Li Y, Cao H, Lin B, Hou Y, Zhou D, Li N. Potential inhibitors of microglial activation from the roots of Vernicia montana Lour. PHYTOCHEMISTRY 2022; 194:113019. [PMID: 34826794 DOI: 10.1016/j.phytochem.2021.113019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 10/19/2021] [Accepted: 11/13/2021] [Indexed: 06/13/2023]
Abstract
During our continuous investigation of natural, herbal inhibitors of microglial over-activation in the Euphorbiaceae family, two plants of the Vernicia genus showed remarkable inhibitory effects on nitric oxide (NO) production in over-activated microglia. In this study, bioactivity-guided phytochemical research on the active fraction of the roots of V. montana was carried out. As a result, seven undescribed terpenoids and lignans, together with thirty-one known components, were isolated and identified using comprehensive spectral analysis. All the identified compounds were evaluated for their inhibitory effects on NO production in lipopolysaccharide-stimulated BV-2 cells. Combined with our previous research on the Vernicia genus, the effective material basis of different plants and medicinal components was analyzed systematically.
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Affiliation(s)
- Yingjie Wang
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, China
| | - Gang Chen
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, China; State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, China; Sate Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, China
| | - Qingqi Meng
- College of Life and Health Sciences, Northeastern University, Shenyang, 110004, China
| | - Xiaohu Yao
- College of Life and Health Sciences, Northeastern University, Shenyang, 110004, China
| | - Yang Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, China
| | - Honglin Cao
- South China Botanical Garden, Chinese Academy of Sciences, Guanzhou, 510650, China
| | - Bin Lin
- School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, 110016, China
| | - Yue Hou
- College of Life and Health Sciences, Northeastern University, Shenyang, 110004, China
| | - Di Zhou
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, China.
| | - Ning Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, China.
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Yu JH, Yu SJ, Liu KL, Wang C, Liu C, Sun JY, Zhang H. Cytotoxic ergostane-type steroids from Ganoderma lingzhi. Steroids 2021; 165:108767. [PMID: 33212127 DOI: 10.1016/j.steroids.2020.108767] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/31/2020] [Accepted: 11/09/2020] [Indexed: 10/23/2022]
Abstract
Two new ergostane-type steroids (1 and 2) have been isolated from the fruiting body of a medicinal macro fungus Ganoderma lingzhi. The structures including the absolute configurations of them were elucidated by a combination of different spectroscopic analyses especially 13C NMR and ECD calculations. Compound 2 features an unusual 1,2-dioxolane moiety. Our bioassays revealed that the two steroids showed remarkable cytotoxicity against human A549 (lung) and MCF-7 (breast) tumor cell lines, with IC50 values ranging from 5.15 to 8.57 μg/mL.
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Affiliation(s)
- Jin-Hai Yu
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China
| | - Shu-Juan Yu
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China
| | - Kai-Lu Liu
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China
| | - Chao Wang
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China
| | - Chao Liu
- Institute of Agro-Food Science and Technology, Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Jin-Yue Sun
- Institute of Agro-Food Science and Technology, Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Hua Zhang
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China.
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Euphane- and 19(10 → 9)abeo-euphane-type triterpenoids from Jatropha gossypiifolia. Fitoterapia 2020; 143:104582. [DOI: 10.1016/j.fitote.2020.104582] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 03/24/2020] [Accepted: 03/26/2020] [Indexed: 12/18/2022]
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Abstract
This review covers newly isolated triterpenoids that have been reported during 2015.
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Jiang CS, Ru T, Huan XJ, Miao ZH, Guo YW. New cytotoxic ergostane-type sterols from the Chinese soft coral Sinularia sp. Steroids 2019; 149:108425. [PMID: 31202682 DOI: 10.1016/j.steroids.2019.108425] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/12/2019] [Accepted: 04/29/2019] [Indexed: 11/15/2022]
Abstract
Two new highly oxygenated ergostane-type sterols (1, 2) together with one known related compound sinugrandisterol A (3) were isolated from the soft coral Sinularia sp. collected from the water area near the Xisha Islands, South China Sea. Their structures were elucidated on the basis of detailed spectroscopic analysis, chemical transformations, and by comparison with those reported in literature. In bioassays, compounds 1 and 2 showed in vitro antiproliferative activity against a panel of cancer cell lines, including MDA-MB-436, A549, Hep3B, HT-29 and H157. Morphological observation and Hoechst 33,258 staining assays showed that compound 1-treated H157 cells displayed apoptosis characteristics. Moreover, western blot assays suggested that 1 could increase the expression of Bax and down-regulate expression of Bcl-2.
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Affiliation(s)
- Cheng-Shi Jiang
- School of Biological Science and Technology, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan 250022, China.
| | - Tong Ru
- 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, 19A Yuquan Road, Beijing 100049, China
| | - Xia-Juan Huan
- 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, 19A Yuquan Road, Beijing 100049, China
| | - Ze-Hong Miao
- 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, 19A Yuquan Road, Beijing 100049, 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, 19A Yuquan Road, Beijing 100049, China; Open Studio for Druggability Research of Marine Lead Compounds, Qingdao National Laboratory for Marine Science and Technology, Wenhai Road, Aoshanwei, Jimo, Qingdao 266237, China.
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Yu ZP, Wang YY, Yu SJ, Bao J, Yu JH, Zhang H. Absolute structure assignment of an iridoid-monoterpenoid indole alkaloid hybrid from Dipsacus asper. Fitoterapia 2019; 135:99-106. [DOI: 10.1016/j.fitote.2019.04.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 04/26/2019] [Accepted: 04/27/2019] [Indexed: 11/26/2022]
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Cytotoxic Effects of Compounds Isolated from Ricinodendron heudelotii. Molecules 2019; 24:molecules24010145. [PMID: 30609707 PMCID: PMC6337108 DOI: 10.3390/molecules24010145] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/31/2018] [Accepted: 11/22/2018] [Indexed: 11/21/2022] Open
Abstract
This study was designed to explore the in vitro anticancer effects of the bioactive compounds isolated from Ricinodendron heudelotii on selected cancer cell lines. The leaves of the plant were extracted with ethanol and partitioned in sequence with petroleum ether, ethyl acetate, and n-butanol. The ethyl acetate fraction was phytochemically studied using thin layer chromatography (TLC) and column chromatography (CC). Structural elucidation of pure compounds obtained from the ethyl acetate fraction was done using mass spectra, 1H-NMR, and 13C-NMR analysis. The isolated compounds were subsequently screened using five different cancer cell lines: HL-60, SMMC-7721, A-549, MCF-7, SW-480, and normal lung epithelial cell line, BEAS-2B, to assess their cytotoxic effects. Nine compounds were isolated and structurally elucidated as gallic acid, gallic acid ethyl ester, corilagin, quercetin-3-O-rhamnoside, myricetin-3-O-rhamnoside, 1,4,6-tri-O-galloyl glucose, 3,4,6-tri-O-galloyl glucose, 1,2,6-tri-O-galloyl glucose, and 4,6-di-O-galloyl glucose. Corilagin exhibited the most cytotoxic activity with an IC50 value of 33.18 μg/mL against MCF-7 cells, which were comparable to cisplatin with an IC50 value of 27.43 µg/mL. The result suggests that corilagin isolated from R. heudelotii has the potential to be developed as an effective therapeutic agent against the growth of breast cancer cells.
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New tetracyclic triterpenoids from Jatropha gossypiifolia induce cell-cycle arrest and apoptosis in RKO cells. Fitoterapia 2018; 130:145-151. [PMID: 30172825 DOI: 10.1016/j.fitote.2018.08.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 08/29/2018] [Accepted: 08/29/2018] [Indexed: 11/22/2022]
Abstract
Four new tetracyclic-type triterpenoids, jatrogossols A - D (1-4), along with 5 known analogues (5-9), were isolated from the ethanol extract of the branches and leaves of Jatropha gossypiifolia. The absolute configurations of 1-4 were defined by using a combination of electronic circular dichroism data analysis and single-crystal X-ray diffraction data. The cytotoxicities of the triterpenoids were evaluated using RKO and HepG2 human cancer cell lines. Compound 8 was cytotoxic against RKO colon cancer cells with an IC50 value of 12.5 μM. The morphological features of apoptosis were evaluated in 8-treated RKO cells. Compound 8 effectively induced apoptosis of RKO, which was associated with G1 or S phase cell cycle arrest. Flow cytometric analysis showed that treatment with 8 significantly induced RKO cell apoptosis in a dose-dependent manner.
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Liu H, Zhu G, Fan Y, Du Y, Lan M, Xu Y, Zhu W. Natural Products Research in China From 2015 to 2016. Front Chem 2018; 6:45. [PMID: 29616210 PMCID: PMC5869933 DOI: 10.3389/fchem.2018.00045] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 02/19/2018] [Indexed: 12/12/2022] Open
Abstract
This review covers the literature published by chemists from China during the 2015-2016 on natural products (NPs), with 1,985 citations referring to 6,944 new compounds isolated from marine or terrestrial microorganisms, plants, and animals. The emphasis is on 730 new compounds with a novel skeleton or/and significant bioactivity, together with their source organism and country of origin.
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Affiliation(s)
- Haishan Liu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Guoliang Zhu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Yaqin Fan
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Yuqi Du
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Mengmeng Lan
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Yibo Xu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Weiming Zhu
- School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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Castillo A, del Moral JFQ, Barrero AF. Studies in Cyclization of Aromatic Epoxy-acyclicpolyprenes: Lewis Superacids and Titanocene Chloride. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Two catalytic cascade cyclization methods (radical and cationic) to obtain aromatic polycyclic diterpenes hydroxylated at C3 starting from aromatic epoxypolyprenes were developed. The catalytic use of the Lewis superacid bismuth triflate produces a good yield of cyclized 2 from epoxypolyprene 3. This research may well direct future efforts to the synthesis of bioactive natural products.
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Affiliation(s)
- Alexis Castillo
- Department of Organic Chemistry, University of Granada, Avda de Fuentenueva s/n, 18071 Granada, Spain
| | - José Fco Quilez del Moral
- Department of Organic Chemistry, University of Granada, Avda de Fuentenueva s/n, 18071 Granada, Spain
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