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Mohri T, Takahashi Y, Kwon E, Kuwahara S, Ogura Y. Stereocontrolled Total Synthesis of (-)-Isocelorbicol and Its Elaboration to Natural Dihydro-β-agarofuran Esters. Org Lett 2020; 22:9234-9238. [PMID: 33226244 DOI: 10.1021/acs.orglett.0c03419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first total synthesis of four naturally occurring dihydro-β-agarofuran esters has been accomplished via a highly stereocontrolled 14-step access to their common core triol, (-)-isocelorbicol. A semipinacol rearrangement of an epoxy alcohol to install a quaternary carbon, diastereoselective conjugate reduction of a spirocyclic butenolide for the establishment of a methyl-bearing chiral center, and ring-closing metathesis to construct the decalin ring system were exploited as the key steps for the high-yielding synthesis of (-)-isocelorbicol.
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Affiliation(s)
- Tomoyo Mohri
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Yusuke Takahashi
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Shigefumi Kuwahara
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan
| | - Yusuke Ogura
- Graduate School of Agricultural Science, Tohoku University, Sendai 980-8572, Japan.,Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
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2
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Shen Y, Chen BL, Zhang QX, Zheng YZ, Fu Q. Traditional uses, secondary metabolites, and pharmacology of Celastrus species - a review. JOURNAL OF ETHNOPHARMACOLOGY 2019; 241:111934. [PMID: 31129308 DOI: 10.1016/j.jep.2019.111934] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 05/02/2019] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Plants of genus Celastrus (Celastraceae) have been widely used in traditional Chinese medicine (TCM) and Indian medicine to treat cognitive dysfunction, epilepsy, insomnia, rheumatism, gout, and dyspepsia for thousands of years. AIM OF STUDY We critically summarized the current evidence on the botanic characterization and distribution, ethnopharmacology, secondary metabolites, pharmacological activities, qualitative and quantitative analysis, and toxicology of Celastrus species to provide perspectives for developing more attractive pharmaceuticals of plant origin. MATERIALS AND METHODS The relevant information on Celastrus species was gathered from worldwide accepted scientific databases via electronic search (Web of Science, SciFinder, PubMed, Elsevier, SpringerLink, Wiley Online, China Knowledge Resource Integrated, and Google Scholar). Information was also obtained from the literature and books as well as PhD and MSc dissertations. Plant names were validated by "The Plant List" (www.theplantlist.org). RESULTS Comprehensive analysis of the above mentioned databases and other sources confirmed that ethnomedical uses of plants of Celastrus genus had been recorded in China, India, and other countries in Southern Asia. The phytochemical investigation revealed the presence of β-dihydroagarofuranoids, diterpenoids, triterpenoids, tetraterpenes, phenylpropanoids, alkaloids, flavonoids, lignans, and others. The crude extracts and isolated constituents have exhibited a wide range of in vitro and in vivo pharmacological effects, including antitumor, cytotoxic, insecticidal, antimicrobial, anti-rheumatoid arthritis (RA), anti-inflammatory, anti-ageing and antioxidative, and neuroprotective activities. CONCLUSION Plants of genus Celastrus have been confirmed to show a strong potential for therapeutic and health-maintaining effects, in light of their long traditional use and the phytochemical and pharmacological studies summarized here. Currently, pharmacological studies of this genus mainly focus on Celastrus paniculatus Willd. and Celastrus orbiculatus Thunb. Therefore, more pharmacological investigations should be implemented to support traditional uses of other medicinal plants of the genus Celastrus. Moreover, studies on the toxicity, bioavailability, and pharmacokinetics, in addition to clinical trials, are indispensable for assessing the safety and efficacy of the secondary metabolites or extracts obtained from plants belonging to this genus.
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Affiliation(s)
- Yue Shen
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture Rural Affairs, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, 610106, China
| | - Bi-Lian Chen
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture Rural Affairs, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, 610106, China
| | - Qin-Xiu Zhang
- School of Medical and Life Sciences, Chengdu University of TCM, Chengdu, 610072, China
| | - Yu-Zhong Zheng
- School of Food Engineering and Biotechnology, Hanshan Normal University, Chaozhou, 521041, China
| | - Qiang Fu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture Rural Affairs, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, 610106, China.
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Paz C, von Dossow D, Tiznado V, Suarez S, Cukiernik FD, Baggio R. A dihydro-β-agarofuran sesquiterpene from Maytenus boaria. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2017; 73:451-457. [PMID: 28579566 DOI: 10.1107/s2053229617006817] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 05/05/2017] [Indexed: 11/10/2022]
Abstract
The natural compound (1S,4S,5S,6R,7R,8R,9R,10S)-6-acetoxy-4,9,10-trihydroxy-2,2,5a,9-tetramethyloctahydro-2H-3,9a-methanobenzo[b]oxepin-5-yl furan-3-carboxylate, C22H30O9, (I), is a β-agarofuran sesquiterpene isolated from the seeds of Maytenus boaria as part of a study of the secondary metabolites from Chilean flora. The compound presents a central structure formed by a decalin system esterified with acetate at site 1 and furan-3-carboxylate at site 9. The chirality of the skeleton can be described as 1S,4S,5S,6R,7R,8R,9R,10S, which is consistent with that suggested by NMR studies. Unlike previously reported structures of sesquiterpenes containing a pure dihydro-β-agarofuran skeleton, (I) exhibits a three-dimensional hydrogen-bonded network.
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Affiliation(s)
- Cristian Paz
- Laboratorio de Química de Productos Naturales, Facultad de Ingeniería, Universidad de La Frontera, Temuco, Chile
| | - Daniela von Dossow
- Laboratorio de Química de Productos Naturales, Facultad de Ingeniería, Universidad de La Frontera, Temuco, Chile
| | - Victor Tiznado
- Laboratorio de Química de Productos Naturales, Facultad de Ingeniería, Universidad de La Frontera, Temuco, Chile
| | - Sebastián Suarez
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
| | - Fabio D Cukiernik
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
| | - Ricardo Baggio
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
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Ning R, Lei Y, Liu S, Wang H, Zhang R, Wang W, Zhu Y, Zhang H, Zhao W. Natural β-Dihydroagarofuran-Type Sesquiterpenoids as Cognition-Enhancing and Neuroprotective Agents from Medicinal Plants of the Genus Celastrus. JOURNAL OF NATURAL PRODUCTS 2015; 78:2175-2186. [PMID: 26295746 DOI: 10.1021/acs.jnatprod.5b00234] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Alzheimer's disease (AD) is an irreversible, multifaceted, and progressive neurodegenerative disorder. Over the past 30 years, the search for anti-AD drugs has been primarily based on the cholinergic deficiency hypothesis and/or the β-amyloid (Aβ) cascade hypothesis. In this study, we report the identification of 16 new and 38 known β-dihydroagarofuran-type sesquiterpenoids from Celastrus flagellaris and Celastrus angulatus. The β-dihydroagarofuran-type sesquiterpenoids 58, 59, 61, and 63 significantly attenuated scopolamine-induced prolonged escape latency and increased number of errors compared with the control group. At 10 μM, 21 of the 62 tested β-dihydroagarofuran-type sesquiterpenoids rescued Aβ25-35-induced SH-SY5Y cells from viability reduction, which increased the cell viability from 64.6% for the model to more than 74.0%. The majority of the β-dihydroagarofuran-type sesquiterpenoids with ester groups exhibited stronger activity than those with free hydroxy groups or without substituents at the same positions. These results identified a new chemical skeleton as drug lead for the investigation of novel therapeutic agents against AD.
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Affiliation(s)
- Ruonan Ning
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Yun Lei
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Shuangzhu Liu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Huan Wang
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Rujun Zhang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Wei Wang
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Yingdong Zhu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Haiyan Zhang
- CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
| | - Weimin Zhao
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai 201203, People's Republic of China
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A versatile, RCM based approach to eudesmane and dihydroagarofuran sesquiterpenoids from (−)-carvone: a formal synthesis of (−)-isocelorbicol. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Wang H, Tian X, Chen YZ. Chemical Constituents of the Aerial Part ofCelastrus Hypoleucus. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200200068] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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7
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Perestelo NR, Sánchez-Cañete MP, Gamarro F, Jiménez IA, Castanys S, Bazzocchi IL. Overcoming human P-glycoprotein-dependent multidrug resistance with novel dihydro-β-agarofuran sesquiterpenes. Eur J Med Chem 2011; 46:4915-23. [PMID: 21856049 DOI: 10.1016/j.ejmech.2011.07.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/25/2011] [Accepted: 07/26/2011] [Indexed: 12/22/2022]
Abstract
Sixteen (1-16) dihydro-β-agarofuran sesquiterpenes were isolated from the fruits of Maytenus jelskii and evaluated against mammalian cells with a multidrug resistance phenotype mediated by the overexpression of the human P-glycoprotein. Their stereostructures have been elucidated on the basis of spectroscopic analysis, including 1D and 2D NMR techniques, CD studies, chemical correlations and biogenetic means. Eight compounds from this series were discovered as potent chemosensitizers (1, 2, 4, 6, 8, 9, 11 and 14), showing similar effectiveness to or higher than the classical P-glycoprotein reversal agent verapamil, a first-generation chemosensitizer, when reversing resistance to daunomycin and vinblastine. Detailed structure-activity relationships revealed that aromatic substituents at the 6 and 9-position of the sesquiterpene scaffold were able to modulate the intensity of inhibition.
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Affiliation(s)
- Nayra R Perestelo
- Instituto Universitario de Bio-Orgánica Antonio González, Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
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Torres-Romero D, Jiménez IA, Rojas R, Gilman RH, López M, Bazzocchi IL. Dihydro-β-agarofuran sesquiterpenes isolated from Celastrus vulcanicola as potential anti-Mycobacterium tuberculosis multidrug-resistant agents. Bioorg Med Chem 2011; 19:2182-9. [PMID: 21419633 DOI: 10.1016/j.bmc.2011.02.034] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 02/18/2011] [Accepted: 02/21/2011] [Indexed: 10/18/2022]
Abstract
In the present study, we report four new dihydro-β-agarofuran sesquiterpenes (1-4), which were isolated from the leaves of Celastrus vulcanicola, in addition to five derivatives (5-9). Their stereostructures were elucidated on the basis of spectroscopic analysis, including 1D and 2D NMR techniques, X-ray studies, chemical correlations and biogenetic means. Compounds 1-9 and the previously reported sesquiterpenes 10-25 have been tested as potential antimycobacterial agents against sensitive and resistant Mycobacterium tuberculosis strains. 1α-Acetoxy-6β,9β-dibenzoyloxy-dihydro-β-agarofuran (20) exhibited antituberculosis activity against the MDR TB strain with a MIC value of 6.2 μg/mL, comparable to or better than isoniazid or rifampin, two of the best first-line drugs commonly used in the treatment of TB. The structure-activity relationship is discussed.
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Affiliation(s)
- David Torres-Romero
- Instituto Universitario de Bio-Orgánica Antonio González y, Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
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9
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Su XH, Zhang ML, Zhan WH, Huo CH, Shi QW, Gu YC, Kiyota H. Chemical and Pharmacological Studies of the Plants from GenusCelastrus. Chem Biodivers 2009; 6:146-61. [DOI: 10.1002/cbdv.200700403] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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Torres-Romero D, Muñoz-Martínez F, Jiménez IA, Castanys S, Gamarro F, Bazzocchi IL. Novel dihydro-β-agarofuran sesquiterpenes as potent modulators of human P-glycoprotein dependent multidrug resistance. Org Biomol Chem 2009; 7:5166-72. [DOI: 10.1039/b915678j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Torres-Romero D, King-Díaz B, Jiménez IA, Lotina-Hennsen B, Bazzocchi IL. Sesquiterpenes from Celastrus vulcanicola as photosynthetic inhibitors. JOURNAL OF NATURAL PRODUCTS 2008; 71:1331-1335. [PMID: 18616221 DOI: 10.1021/np070647y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Three new sesquiterpenoids (1- 3) with a dihydro-beta-agarofuran skeleton were isolated from Celastrus vulcanicola. Their structures were elucidated on the basis of spectroscopic analysis, including homonuclear and heteronuclear correlation NMR experiments (COSY, ROESY, HSQC, and HMBC), and the absolute configurations were determined by circular dichroism and chemical correlations. Their effects on photosynthesis were tested. Sesquiterpene 1 (50 microM) inhibits both light-dependent synthesis of ATP and the electron flow in chloroplasts, whereas at high concentrations the electron flow inhibition was partially reversed. Therefore, 1 behaves as a Hill reaction inhibitor and a weak energy transfer inhibitor and has two targets of interaction: one located at the oxygen-evolving complex, and the other located at the light-activated Mg (2+)-ATPase. Compound 2 was inactive, whereas 3 acts with the same mechanisms as 1 but was less active. Celastrus vulcanicola J. Donnell Smith (Celastraceae) is a subtropical woody vine distributed in Central America and the Caribbean. Its chemical constituents and biological activity have not yet been investigated.
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Affiliation(s)
- David Torres-Romero
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain
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12
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Zhu Y, Miao Z, Ding J, Zhao W. Cytotoxic dihydroagarofuranoid sesquiterpenes from the seeds of Celastrus orbiculatus. JOURNAL OF NATURAL PRODUCTS 2008; 71:1005-1010. [PMID: 18507472 DOI: 10.1021/np800052d] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A chemical study on the seeds of Celastrus orbiculatus has led to the isolation of nine new (1- 9) and 13 known dihydro-beta-agarofuran derivatives. The identification and structural elucidation of the new compounds were based on spectroscopic data analysis, and the absolute configurations of compounds 1- 6, 8-10, and 16, as well as derivatives 2a and 6a, were determined by CD studies or by chemical methods. All compounds isolated were evaluated for cytotoxic activity against HL-60 human leukemia cells.
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Affiliation(s)
- Yingdong Zhu
- Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China
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13
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Gonzalez AG, Nuñez MP, Bazzocchi IL, Ravelo AG, Jimenez IA. Sesquiterpenes fromMaytenus magellanica(Celastraceae). ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10575639308043803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Asymmetric total synthesis of (−)-isocelorbicol, a natural dihydroagarofuran sesquiterpenoid. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00810-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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15
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Zhou G, Gao X, Li WZ, Li Y. An enantioselective synthetic strategy toward the polyhydroxylated agarofuran. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00377-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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González A, Bazzocchi I, Moujir L, Jiménez I. Ethnobotanical uses of celastraceae. Bioactive metabolites. BIOACTIVE NATURAL PRODUCTS (PART D) 2000. [DOI: 10.1016/s1572-5995(00)80140-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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17
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The Celastraceae from Latin America Chemistry and Biological Activity. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/s1572-5995(96)80038-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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18
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González AG, Jiménez IA, Ravelo AG, Sazatornil JG, Bazzocchi IL. New sesquiterpenes with antifeedant activity from Maytenus canariensis (Celastraceae). Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)86271-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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González AG, Jiménez IA, Ravelo AG, Bellés X, Piulachs M. Antifeedant activity of dihydro-β-agarofuran sesquiterpenes from Celastraceae against Spodoptera littoralis. BIOCHEM SYST ECOL 1992. [DOI: 10.1016/0305-1978(92)90042-c] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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González AG, Muñoz OM, Ravelo AG, Crespo A, Bazzocchi IL, Jiménez IA, Solans X, Ruiz-Pérez C, Rodríguez-Romero V. A new sesquiterpene from Maytenus boaria (Celastraceae); crystal structure and absolute configuration. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)74179-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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21
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González AG, Nuñez MP, Ravelo AG, Sazatornil JG, Vázquez JT, Bazzocchi IL, Morales EQ, Muñoz OM. Structural elucidation and absolute configuration of novel β-agarofuran (epoxyeudesmene) sesquiterpenes from Maytenus magellanica(Celastraceae). ACTA ACUST UNITED AC 1992. [DOI: 10.1039/p19920001437] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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23
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24
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Isolation and structures of a new alkaloid alatamine and an insecticidal alkaloid wilfordine from euonymus alatus forma striatus (thunb.) makino. Tetrahedron 1978. [DOI: 10.1016/0040-4020(78)80097-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Absolute konfiguration von malkanguniol, einem sesquiterpentetrol aus celastrus paniculatus willd. Tetrahedron Lett 1978. [DOI: 10.1016/s0040-4039(01)85605-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Chapter 4 The Celastraceae Alkaloids. ACTA ACUST UNITED AC 1977. [DOI: 10.1016/s1876-0813(08)60071-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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