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Chacón-Morales PA. Unprecedented diterpene skeletons isolated from vascular plants in the last twenty years (2001-2021). PHYTOCHEMISTRY 2022; 204:113425. [PMID: 36096268 DOI: 10.1016/j.phytochem.2022.113425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
Every year there are hundreds of reports about the isolation of undescribed terpenoids based on novel functionalizations of known carbocyclic skeletons series. However, on some occasions the compounds obtained have a carbocyclic skeleton that does not correspond with the series established, in these peculiar opportunities, in addition to finding an undescribed natural product, is obtained an unprecedented carbocyclic skeleton, whose biogenesis must necessarily involve other additional steps that explain its formation. This review accounts for the reports of seventy-nine unprecedented diterpene skeletons (corresponding to one-hundred-three undescribed diterpenoids) isolated from vascular plants in the last two decades. According to the genus, Euphorbia and Salvia are the most prolific in reports of unprecedented diterpene skeletons with a total of twenty, and nine skeletons, respectively. If the findings are expressed in terms of the family, Euphorbiaceae and Lamiaceae have the highest number of reports of undescribed diterpene skeletons, with twenty-seven and twenty-two, respectively. Finally, fifty-three skeletons are derived from higher diterpenoids (2-12, 68, 69, 86, 104-109, 158-161, 186, 189, 222, 250-255, 285-298, 403-404, 415, 416, and 436), twenty are derived from lower diterpenoids (135, 136, 192-194, 225-229, 363-370, 397, and 425), and six (96, 97, 147, 148, 205, and 206) are derived from skeletons whose biogenesis has not yet been established, or at least, cannot be formally included within the groups mentioned above. This article comprehensively highlights the hypothetical biosynthetic pathway for each of the one-hundred-three undescribed compounds with unprecedented diterpene skeletons and summarizes their most significant biological activities.
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Affiliation(s)
- Pablo A Chacón-Morales
- Natural Products Laboratory, Department of Chemistry, Faculty of Science, University of Los Andes, Mérida, 5101, Venezuela.
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2
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Ciocarlan A. From (-)-sclareol to Norlabdane Heterocyclic Hybrid Compounds. CHEMISTRY JOURNAL OF MOLDOVA 2022. [DOI: 10.19261/cjm.2022.958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Abstract
This review relates to chemistry of the well-known biologically active natural labdane diterpenoid (-)-sclareol easily available from Clary sage (Salvia sclarea L.). It is mainly used in industry, especially for synthesis of fragrance compounds and natural analogs. The paper covers achievements on the synthesis, structure determination and biological activity of molecular hybrid compounds bearing hydrazide and thiosemicarbazone fragments or diazine, 1,2,4-triazole, carbazole, 1,3-thiazole, 1,3,4-oxadiazole, 1,3,4-thiadiazole units prepared based on it.
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Affiliation(s)
- Alexandru Ciocarlan
- Institute of Chemistry, 3 Academiei str., Chisinau MD 2028, Republic of Moldova
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3
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Liyanage Perera E, Lee D. Synthesis of 4-Pyrones by Formal Hydration of 1,3-Diynones Promoted by 1,4-Addition of Piperidine. Org Lett 2022; 24:7042-7046. [PMID: 36125167 DOI: 10.1021/acs.orglett.2c02914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new approach for the synthesis of 4-pyrones with broader substrate scope and functional group tolerance is described. The reaction proceeds via an initial 1,4-addition by piperidine, followed by nitrogen-assisted 6-endo-dig cyclization and hydrolysis. 1,3-Diynones with nonenolizable electron-withdrawing ketones and nonpropargylic H provide relatively high yields. For substrates with particular R2 substituents, 1,4- or 1,6-adducts were isolated, suggesting that steric and electronic factors of the R2 substituent should have a strong impact on the 6-endo-dig cyclization.
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Affiliation(s)
- Erandi Liyanage Perera
- Department of Chemistry, University of Illinois─Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Daesung Lee
- Department of Chemistry, University of Illinois─Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
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4
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Aslanoglu F. Synthesis of 2‐Methyl‐pyran‐4‐ones through Reaction of Acetylketene with Terminal Acetylenes in Presence of Gold (I). ChemistrySelect 2022. [DOI: 10.1002/slct.202201089] [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)
- Furgan Aslanoglu
- Department of Chemistry Van Yuzuncu Yil University 65080 Van Turkey
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5
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Lu CL, Wang LN, Li YJ, Fan QF, Huang QH, Chen JJ. Anti-hyperglycaemic effect of labdane diterpenes isolated from the rhizome of Amomum maximum Roxb., an edible plant in Southwest China. Nat Prod Res 2021; 36:2570-2574. [PMID: 33759661 DOI: 10.1080/14786419.2021.1903006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Amomum maximum Roxb. rhizome is a fork medicine mainly used in South and Southeast Asia. In present study, the hypoglycaemic effects of the ethanolic extract of A. maximum rhizome were demonstrated both on α-glucosidase assay in vitro and streptozotocin (STZ)-induced postprandial hyperglycaemia in mice. Furthermore, six labdane diterpenes, amoxanthin A (1), ottensinin (2), coronarin D (3), coronarin D methyl ether (4), isocoronarin D (5), and zerumin (6), were isolated from its ethyl acetate sub-fraction with the guidance of α-glucosidase inhibitory activity. Among these compounds, 2 and 6 exhibited significant inhibitory effect on α-glucosidase, as well as on STZ-induced high postprandial blood glucose levels in mice. Additionally, molecular docking analysis revealed that 2 and 6 could firmly bind to the active sites of α-glucosidase. These results suggest that compounds 2 and 6 are the main anti-hyperglycaemic agents present in A. maximum, which may demonstrate potential beneficial effects in diabetes management.
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Affiliation(s)
- Chuan-Li Lu
- Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou, China
| | - Li-Ning Wang
- Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou, China
| | - Ya-Jun Li
- Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou, China
| | - Qing-Fei Fan
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Qing-Hua Huang
- Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou, China
| | - Jun-Jia Chen
- Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou, China
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6
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Tran QTN, Wong WSF, Chai CLL. The identification of naturally occurring labdane diterpenoid calcaratarin D as a potential anti-inflammatory agent. Eur J Med Chem 2019; 174:33-44. [PMID: 31022551 DOI: 10.1016/j.ejmech.2019.04.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Revised: 03/28/2019] [Accepted: 04/10/2019] [Indexed: 10/27/2022]
Abstract
In this study we report, for the first time, the synthesis of the natural product calcaratarin D via a stereo- and regio-selective aldol condensation with (S)-β-hydroxy-γ-butyrolactone as key steps. A concise synthetic route (under 10 steps) to a series of structurally related normal-labdane diterpenes was also developed and their anti-inflammatory activities were evaluated in an in vitro model of inflammation. The structure-activity relationships (SARs) pertaining to the labdane scaffold were elucidated and results suggest that an α-alkylidene-β-hydroxy-γ-butyrolactone system is necessary for potent activity in the labdanes. Our studies identified the natural product calcaratarin D (1) as a promising anti-inflammatory agent, which effectively modulates the production of pro-inflammatory mediators (e.g., TNF-α, IL-6, NO) at both transcriptional and translational levels. These inhibitory effects are likely to occur via the suppression of nuclear factor kappa B (NF-κB) activation by reducing the p65 nuclear translocation but not its phosphorylation or protein expression. Calcaratarin D exhibited significantly greater inhibition of NF-κB activation than andrographolide, a well-known NF-κB inhibitor from the labdane family, suggesting that a normal-configuration labdane ring or the absence of hydroxyl groups at C-3 and C-19 positions is favorable for potent NF-κB inhibition. We further investigated the effects of calcaratarin D on the upstream signalling pathways and found that the compound selectively suppressed the LPS-induced activation of PI3K/Akt pathway without affecting much of the MAPK (i.e., ERK, JNK, and p38) activation. These findings demonstrate that calcaratarin D exerts its anti-inflammatory effects via a selective Akt-NF-κB-mediated mechanism and potentially offers a new therapeutic strategy for the management of inflammatory diseases.
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Affiliation(s)
- Quy T N Tran
- Department of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, 117543, Singapore.
| | - W S Fred Wong
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University Health System, 117600, Singapore; Life Science Institute, National University of Singapore, 117456, Singapore; SHARE, Molecular Mechanisms of Inflammatory Disease Interdisciplinary Research Group, Singapore; Drug Discovery and Optimization Platform, Medical Science Cluster, Yong Loo Lin School of Medicine, National University Health System, Singapore.
| | - Christina L L Chai
- Department of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, 117543, Singapore; Drug Discovery and Optimization Platform, Medical Science Cluster, Yong Loo Lin School of Medicine, National University Health System, Singapore.
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7
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Menger M, Christmann M. Formal synthesis of actinoranone using a one-pot semipinacol rearrangement/Wittig reaction. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.11.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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8
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Ji KL, Fan YY, Ge ZP, Sheng L, Xu YK, Gan LS, Li JY, Yue JM. Maximumins A–D, Rearranged Labdane-Type Diterpenoids with Four Different Carbon Skeletons from Amomum maximum. J Org Chem 2018; 84:282-288. [DOI: 10.1021/acs.joc.8b02665] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kai-Long Ji
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Yao-Yue Fan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Zhan-Peng Ge
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Li Sheng
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - You-Kai Xu
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, China
| | - Li-She Gan
- Institute of Modern Chinese Medicine, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jing-Ya Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Jian-Min Yue
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
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9
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Maezono SMB, Park GE, Lee YR. Regiospecific construction of diverse and polyfunctionalized γ-pyrone cores by indium(iii)-catalyzed annulation of diazodicarbonyls with active methylenes, 4-hydroxycoumarins, or 4-hydroxyquinolinone. Org Chem Front 2018. [DOI: 10.1039/c8qo01006d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient and novel annulation protocol for the construction of diverse and polyfunctionalized γ-pyrones via an InBr3-catalyzed reaction is described.
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Affiliation(s)
| | - Ga Eul Park
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan 712-749
- Republic of Korea
| | - Yong Rok Lee
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan 712-749
- Republic of Korea
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10
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Wang HS, Li HJ, Nan X, Luo YY, Wu YC. Enantiospecific Semisynthesis of Puupehedione-Type Marine Natural Products. J Org Chem 2017; 82:12914-12919. [DOI: 10.1021/acs.joc.7b02413] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hong-Shuang Wang
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Hui-Jing Li
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Xiang Nan
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Yuan-Yuan Luo
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Yan-Chao Wu
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
- Beijing
National Laboratory for Molecular Sciences, ICCAS, Beijing 100190, China
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11
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Xu YL, Teng QH, Tong W, Wang HS, Pan YM, Ma XL. Atom-Economic Synthesis of 4-Pyrones from Diynones and Water. Molecules 2017; 22:E109. [PMID: 28075414 PMCID: PMC6155647 DOI: 10.3390/molecules22010109] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/05/2017] [Accepted: 01/05/2017] [Indexed: 12/31/2022] Open
Abstract
Transition-metal-free synthesis of 4-pyrones via TfOH-promoted nucleophilic addition/cyclization of diynones and water has been developed. This transformation is simple, atom economical and environmentally benign, providing rapid and efficient access to substituted 4-pyrones.
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Affiliation(s)
- Yan-Li Xu
- College of Pharmacy, Guilin Medical University, Guilin 541004, China.
| | - Qing-Hu Teng
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Wei Tong
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Heng-Shan Wang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Ying-Ming Pan
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China.
| | - Xian-Li Ma
- College of Pharmacy, Guilin Medical University, Guilin 541004, China.
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12
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Dong S, Fang C, Tang W, Lu T, Du D. Alkynyl Acylammoniums as Electrophilic 3C Synthons in a Formal [3 + 3] Annulation: Access to Functionalized 4H-Pyran-4-ones. Org Lett 2016; 18:3882-5. [DOI: 10.1021/acs.orglett.6b01891] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Shuding Dong
- State Key Laboratory of Natural
Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Chao Fang
- State Key Laboratory of Natural
Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Weifang Tang
- State Key Laboratory of Natural
Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Tao Lu
- State Key Laboratory of Natural
Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Ding Du
- State Key Laboratory of Natural
Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, P. R. China
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13
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Ohtawa M, Hishinuma Y, Takagi E, Yamada T, Ito F, Arima S, Uchida R, Kim YP, Ōmura S, Tomoda H, Nagamitsu T. Synthesis and Structural Revision of Cyslabdan. Chem Pharm Bull (Tokyo) 2016; 64:1370-7. [DOI: 10.1248/cpb.c16-00382] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Masaki Ohtawa
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | | | - Eiji Takagi
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | - Takafumi Yamada
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | - Fumihiro Ito
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | - Shiho Arima
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | - Ryuji Uchida
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | | | - Satoshi Ōmura
- Kitasato Institute for Life Sciences and Graduate School of Infection Control Sciences, Kitasato University
| | - Hiroshi Tomoda
- Graduate School of Pharmaceutical Sciences, Kitasato University
| | - Tohru Nagamitsu
- Graduate School of Pharmaceutical Sciences, Kitasato University
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14
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Misassigned natural products and their revised structures. Arch Pharm Res 2015; 39:143-153. [DOI: 10.1007/s12272-015-0649-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Accepted: 08/08/2015] [Indexed: 01/16/2023]
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15
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Synthesis and Structure of Homodrimane Sesquiterpenoids Containing 1,2,4-Triazole and Carbazole Rings. Chem Nat Compd 2015. [DOI: 10.1007/s10600-015-1384-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Sivasothy Y, Zachariah CCK, Leong KH, John SKS, Ibrahim H, Awang K. A novel heptacyclic diterpene from Alpinia pahangensis Ridley, a wild ginger endemic to Malaysia. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Luo JG, Yin H, Fan BY, Kong LY. Labdane Diterpenoids from the Roots ofAmomum maximumand Their Cytotoxic Evaluation. Helv Chim Acta 2014. [DOI: 10.1002/hlca.201300426] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Qiu YF, Yang F, Qiu ZH, Zhong MJ, Wang LJ, Ye YY, Song B, Liang YM. Brønsted Acid Catalyzed and NIS-Promoted Cyclization of Diynones: Selective Synthesis of 4-Pyrone, 4-Pyridone, and 3-Pyrrolone Derivatives. J Org Chem 2013; 78:12018-28. [DOI: 10.1021/jo402055a] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Yi-Feng Qiu
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Fang Yang
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Zi-Hang Qiu
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Mei-Jin Zhong
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Li-Jing Wang
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Yu-Ying Ye
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Bo Song
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Yong-Min Liang
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People’s Republic of China
- State
Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical
Physics, Chinese Academy of Science, Lanzhou 730000, People’s Republic of China
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20
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21
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Frija LMT, Frade RFM, Afonso CAM. Isolation, chemical, and biotransformation routes of labdane-type diterpenes. Chem Rev 2011; 111:4418-52. [PMID: 21618966 DOI: 10.1021/cr100258k] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Luís M T Frija
- CQFM - Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Departamento de Engenharia Química e Biológica Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.
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22
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Riofski MV, John JP, Zheng MM, Kirshner J, Colby DA. Exploiting the facile release of trifluoroacetate for the α-methylenation of the sterically hindered carbonyl groups on (+)-sclareolide and (-)-eburnamonine. J Org Chem 2011; 76:3676-83. [PMID: 21491928 DOI: 10.1021/jo102114f] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient method for the α-methylenation of carbonyl groups is reported, and this transformation is accomplished by a facile elimination of trifluoroacetate during the formation of the olefin. This method represents an improvement beyond existing protocol in cases of steric hindrance, and we have demonstrated the utility of the process across a series of ketones, lactams, and lactones. Additionally, we have applied this method to produce semisynthetic derivatives of the natural products (+)-sclareolide and (-)-eburnamonine, in which the carbonyl group is proximal to bulky functional groups. Mechanistic insight is also provided from a time course of (19)F NMR. Biological evaluation of the natural-product-derived enones led to the identification of a derivative of (-)-eburnamonine with significant cytotoxicity (LC(50) = 14.12 μM) in drug-resistant MDA-MB-231 breast cancer cells.
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Affiliation(s)
- Mark V Riofski
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
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23
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Smith SG, Goodman JM. Assigning stereochemistry to single diastereoisomers by GIAO NMR calculation: the DP4 probability. J Am Chem Soc 2011; 132:12946-59. [PMID: 20795713 DOI: 10.1021/ja105035r] [Citation(s) in RCA: 604] [Impact Index Per Article: 46.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
GIAO NMR shift calculation has been applied to the challenging task of reliably assigning stereochemistry with quantifiable confidence when only one set of experimental data are available. We have compared several approaches for assigning a probability to each candidate structure and have tested the ability of these methods to distinguish up to 64 possible diastereoisomers of 117 different molecules, using NMR shifts obtained in rapid and computationally inexpensive single-point calculations on molecular mechanics geometries without time-consuming ab initio geometry optimization. We show that a probability analysis based on the errors in each (13)C or (1)H shift is significantly more successful at making correct assignments with high confidence than are probabilities based on the correlation coefficient and mean absolute error parameters. Our new probability measure, which we have termed DP4, complements the probabilities obtained from our previously developed CP3 parameter, which applies to the case of assigning a pair of diastereoisomers when one has both experimental data sets. We illustrate the application of DP4 to assigning the stereochemistry or structure of 21 natural products that were originally misassigned in the literature or that required extensive synthesis of diastereoisomers to establish their stereochemistry.
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Affiliation(s)
- Steven G Smith
- Unilever Centre for Molecular Science Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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25
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Synthesis of two marine farnesylacetones that dilate the basilar arteries of rabbits. Bioorg Med Chem Lett 2010; 20:4206-9. [DOI: 10.1016/j.bmcl.2010.05.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 05/08/2010] [Accepted: 05/12/2010] [Indexed: 11/21/2022]
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26
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Tiengburanatam N, Boonmee A, Sangvanich P, Karnchanatat A. A Novel α-Glucosidase Inhibitor Protein from the Rhizomes of Zingiber ottensii Valeton. Appl Biochem Biotechnol 2010; 162:1938-51. [DOI: 10.1007/s12010-010-8971-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Accepted: 04/11/2010] [Indexed: 11/28/2022]
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Jung ME, Cordova J, Murakami M. Total Synthesis of (±)-Kellermanoldione: Stepwise Cycloaddition of a Functionalized Diene and Allenoate. Org Lett 2009; 11:3882-5. [DOI: 10.1021/ol901455q] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael E. Jung
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095
| | - Jesus Cordova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095
| | - Masayuki Murakami
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095
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Wilk W, Waldmann H, Kaiser M. γ-Pyrone natural products—A privileged compound class provided by nature. Bioorg Med Chem 2009; 17:2304-9. [DOI: 10.1016/j.bmc.2008.11.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2008] [Revised: 11/01/2008] [Accepted: 11/04/2008] [Indexed: 12/31/2022]
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