1
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Cuong DV, Hanh TTH, Huong PTM, Huong NT, Quang TH, Cuong NX. Glycoside constituents from Cayratia geniculata. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2024; 26:1130-1137. [PMID: 38758006 DOI: 10.1080/10286020.2024.2347521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 04/19/2024] [Accepted: 04/21/2024] [Indexed: 05/18/2024]
Abstract
Using various chromatographic separations, six glycoside derivatives (1-6), including one new ent-labdane glucoside named cayratioside (1), were isolated from the methanol extract of Cayratia geniculata stems and leaves. Their structures were elucidated by detailed analysis of the 1D, 2D NMR, and HRESIQTOF mass spectra. The inhibitory effect of 1-6 on LPS-induced NO production in RAW264.7 cells was also evaluated. Among isolated compounds, 1 exhibited moderate activity with an IC50 value of 59.65 ± 1.85 µM.
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Affiliation(s)
- Dang Viet Cuong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
- National Institute of Medicinal Materials, Ministry of Health, Hanoi, Vietnam
- University of Medicine and Pharmacy (VNU-UMP), Vietnam National University Hanoi, Hanoi, Vietnam
| | - Tran Thi Hong Hanh
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Pham Thi Mai Huong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Nguyen Thi Huong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Tran Hong Quang
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Nguyen Xuan Cuong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
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2
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Gerometta E, Herbette G, Garayev E, Marvilliers A, Naubron JV, Di Giorgio C, Campos PE, Clerc P, Ledoux A, Frederich M, Baghdikian B, Grondin I, Gauvin-Bialecki A. Cytotoxic Metabolites from Calophyllum tacamahaca Willd.: Isolation and Detection through Feature-Based Molecular Networking. Metabolites 2023; 13:metabo13050582. [PMID: 37233623 DOI: 10.3390/metabo13050582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/14/2023] [Accepted: 04/18/2023] [Indexed: 05/27/2023] Open
Abstract
Isocaloteysmannic acid (1), a new chromanone, was isolated from the leaf extract of the medicinal species Calophyllum tacamahaca Willd. along with 13 known metabolites belonging to the families of biflavonoids (2), xanthones (3-5, 10), coumarins (6-8) and triterpenes (9, 11-14). The structure of the new compound was characterized based on nuclear magnetic resonance (NMR), high-resolution electrospray mass spectrometry (HRESIMS), ultraviolet (UV) and infrared (IR) data. Its absolute configuration was assigned through electronic circular dichroism (ECD) measurements. Compound (1) showed a moderate cytotoxicity against HepG2 and HT29 cell lines, with IC50 values of 19.65 and 25.68 µg/mL, respectively, according to the Red Dye method. Compounds 7, 8 and 10-13 exhibited a potent cytotoxic activity, with IC50 values ranging from 2.44 to 15.38 µg/mL, against one or both cell lines. A feature-based molecular networking (FBMN) approach led to the detection of a large amount of xanthones in the leaves extract, and particularly analogues of the cytotoxic isolated xanthone pyranojacareubin (10).
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Affiliation(s)
- Elise Gerometta
- Laboratoire de Chimie et de Biotechnologie des Produits Naturels, Faculté des Sciences et Technologies, Université de La Réunion, Campus du Moufia, 97744 St Denis, France
| | - Gaëtan Herbette
- Spectropole, FSCM, Centrale Marseille, CNRS, Aix-Marseille Université, Campus de St Jérôme-Service 511, 13397 Marseille, France
| | - Elnur Garayev
- IMBE, CNRS, IRD, Aix Marseille Université, Faculté de Pharmacie, Service de Pharmacognosie, 13331 Marseille, France
| | - Arnaud Marvilliers
- Laboratoire de Chimie et de Biotechnologie des Produits Naturels, Faculté des Sciences et Technologies, Université de La Réunion, Campus du Moufia, 97744 St Denis, France
| | - Jean-Valère Naubron
- Spectropole, FSCM, Centrale Marseille, CNRS, Aix-Marseille Université, Campus de St Jérôme-Service 511, 13397 Marseille, France
| | - Carole Di Giorgio
- IMBE, CNRS, IRD, Aix-Marseille Université, Faculté de Pharmacie, Service de Mutagénèse Environnementale, 13385 Marseille, France
| | - Pierre-Eric Campos
- Laboratoire de Chimie et de Biotechnologie des Produits Naturels, Faculté des Sciences et Technologies, Université de La Réunion, Campus du Moufia, 97744 St Denis, France
- Institut de Chimie Organique et Analytique, UMR 6759, Université d'Orléans-CNRS, Pôle de Chimie, Rue de Chartres, BP6759, CEDEX 2, 45067 Orléans, France
| | - Patricia Clerc
- Laboratoire de Chimie et de Biotechnologie des Produits Naturels, Faculté des Sciences et Technologies, Université de La Réunion, Campus du Moufia, 97744 St Denis, France
| | - Allison Ledoux
- Laboratoire de Pharmacognosie, Centre Interfacultaire de Recherche sur le Médicament (CIRM), Université de Liège, Département de Pharmacie, Campus du Sart-Tilman, Quartier Hôpital, B-4000 Liège, Belgium
| | - Michel Frederich
- Laboratoire de Pharmacognosie, Centre Interfacultaire de Recherche sur le Médicament (CIRM), Université de Liège, Département de Pharmacie, Campus du Sart-Tilman, Quartier Hôpital, B-4000 Liège, Belgium
| | - Béatrice Baghdikian
- IMBE, CNRS, IRD, Aix Marseille Université, Faculté de Pharmacie, Service de Pharmacognosie, 13331 Marseille, France
| | - Isabelle Grondin
- Laboratoire de Chimie et de Biotechnologie des Produits Naturels, Faculté des Sciences et Technologies, Université de La Réunion, Campus du Moufia, 97744 St Denis, France
| | - Anne Gauvin-Bialecki
- Laboratoire de Chimie et de Biotechnologie des Produits Naturels, Faculté des Sciences et Technologies, Université de La Réunion, Campus du Moufia, 97744 St Denis, France
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3
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de Heuvel E, Singh AK, Boronat P, Kooistra AJ, van der Meer T, Sadek P, Blaazer AR, Shaner NC, Bindels DS, Caljon G, Maes L, Sterk GJ, Siderius M, Oberholzer M, de Esch IJ, Brown DG, Leurs R. Alkynamide phthalazinones as a new class of TbrPDEB1 inhibitors (Part 2). Bioorg Med Chem 2019; 27:4013-4029. [DOI: 10.1016/j.bmc.2019.06.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 06/12/2019] [Accepted: 06/14/2019] [Indexed: 01/27/2023]
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4
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Aiken S, Anozie K, de Azevedo ODCC, Cowen L, Edgar RJL, Gabbutt CD, Heron BM, Lawrence PA, Mills AJ, Rice CR, Urquhart MWJ, Zonidis D. Expedient synthesis of highly substituted 3,4-dihydro-1,2-oxathiine 2,2-dioxides and 1,2-oxathiine 2,2-dioxides: revisiting sulfene additions to enaminoketones. Org Biomol Chem 2019; 17:9585-9604. [DOI: 10.1039/c9ob01657k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The addition of sulfenes to substituted enaminoketones, followed by a facile Cope elimination, provides efficient access to a diverse series of 1,2-oxathiine 2,2-dioxides.
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5
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Kulesza U, Plum LA, DeLuca HF, Mouriño A, Sicinski RR. Novel 9-Alkyl- and 9-Alkylidene-Substituted 1α,25-Dihydroxyvitamin D3 Analogues: Synthesis and Biological Examinations. J Med Chem 2015. [DOI: 10.1021/acs.jmedchem.5b00795] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Urszula Kulesza
- Department
of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Lori A. Plum
- Department
of Biochemistry, University of Wisconsin—Madison, 433 Babcock Drive, Madison, Wisconsin 53706, United States
| | - Hector F. DeLuca
- Department
of Biochemistry, University of Wisconsin—Madison, 433 Babcock Drive, Madison, Wisconsin 53706, United States
| | - Antonio Mouriño
- Departamento
de Química Orgánica, Laboratorio de Investigación
Ignacio Ribas, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Rafal R. Sicinski
- Department
of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
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6
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Kahveci B, Karaali N, Menteşe E, Yilmaz F. Synthesis of New Perimidine Derivatives from the Reaction of 1,8-Diaminonapthalene with Iminoester Hydrochlorides. JOURNAL OF CHEMICAL RESEARCH 2013. [DOI: 10.3184/174751913x13691578103477] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An alternative procedure is described for the synthesis of 2-substituted perimidines involving the reaction of 1,8-diaminonapthalene with iminoester hydrochlorides of substituted phenylacetic acids under microwave irradiation. This leads to good yields in short reaction times. The results were compared with those that used conventional heating. This new method may be preferable for the synthesis of perimidines.
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Affiliation(s)
- Bahittin Kahveci
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Karadeniz Technical University, 61080-Trabzon, Turkey
| | - Nesrin Karaali
- Department of Chemistry, Art and Science Faculty, Recep Tayyip Erdoğan University 53100-Rize, Turkey
| | - Emre Menteşe
- Department of Chemistry, Art and Science Faculty, Recep Tayyip Erdoğan University 53100-Rize, Turkey
| | - Fatih Yilmaz
- Department of Chemistry, Art and Science Faculty, Recep Tayyip Erdoğan University 53100-Rize, Turkey
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7
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Anteunis M, Tavernier D, Borremans F. NMR experiments on ketals VI. PMR spectra of alkyl substituted 1, 3-dioxanes with rigid or anancomeric structures. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19660750513] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Anteunis M. The influence of spatial orientation of free orbitals in pmr spectroscopy influence of vicinal orbitals on 3J and 2J. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19660750514] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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9
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Remijnse JD, van Bekkum H, Wepster BM. Proton magnetic resonance studies of specifically deuterated cyclohexane compounds. Part I.: Cyclohexane and Methylcyclohexane. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19700890612] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Kraus W. Bicyclische Verbindungen, I. Stereoselektive Darstellung von
cis
‐ und
trans
‐Bicyclo‐[3.2.1]‐octanol‐(3). ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19640971002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wolfgang Kraus
- Pharmazeutisch‐Chemischen Institut der Universität Tübingen
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11
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Naves YR. Etudes sur les matières végétales volatiles. CXCIV [1] Stéréochimie conformationnelle des carvomenthols d'après leurs spectres d'absorption infrarouge et leyrs spectres de résonance magnétique nucléaire (2ecommunication). Helv Chim Acta 2004. [DOI: 10.1002/hlca.19640470625] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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1H and13C spectroscopy in the study of flavan-3-ols, proanthocyanidins, and their derivatives. Chem Nat Compd 1997. [DOI: 10.1007/bf02273915] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Schuster T, Evans SA. HETERO-DIELS-ALDER REACTIONS OF DIMETHYL 1-OXO-(E,E)-2,4-HEXADIENEPHOSPHONATE WITH 2-ALKYLIDENE-1,3-DITHIANES. PHOSPHORUS SULFUR 1995. [DOI: 10.1080/10426509508027385] [Citation(s) in RCA: 10] [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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Clayton SE, Gabbutt CD, Hepworth JD, Heron B. Direct aromatic tert-butylation during the synthesis of thiochroman-4-ones. Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)80335-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Nishiyama T, Miyatake S, Yamaguchi H, Yamada F. The Stereochemistry of the Sulfur Atom of 4,7-Dimethyl-6-phenyl-5,6,7,8-tetrahydro-4 H-1,3,2,6-dioxathiazocine 2-Oxides. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1992. [DOI: 10.1246/bcsj.65.2294] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Nishiyama T, Iwasaki Y, Nishikawa T, Miyatake S, Yamada F. The stereochemical investigation of 8-membered 1,3,6-dioxazocinesviaNMR. J Heterocycl Chem 1991. [DOI: 10.1002/jhet.5570280532] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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17
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Naya K, Shimizu M, Nishio H, Takeda M, Oka S, Hirota K. The Photosensitized Oxygenation of Furanoeremophilanes. III. The Transformations to the Skeletally Isomeric Lactones from Furanofukinol. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1991. [DOI: 10.1246/bcsj.64.1071] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Ertan M, Ertan R, Göker H, Pindur U. Studies on the synthesis of some flavonoid derivatives possessing spasmolytic activity. Arch Pharm (Weinheim) 1987; 320:1132-8. [PMID: 3439859 DOI: 10.1002/ardp.198700021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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19
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Crist DR, Borsetti AP, Jordan GJ, Hammer CF. Interproton coupling constant variations in 3-membered ring heterocycles. Separation of lone pair and inductive effects. ACTA ACUST UNITED AC 1980. [DOI: 10.1002/mrc.1270130110] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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21
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Viktorova NM, Knyazev SP, Zefirov NS, Gavrilov YD, Nikolaev GM, Bystrov VF. Stereochemical studies: XVII—the proton coupling constants and conformational equilibria oftrans-1,2-disubstituted cyclohexenes. ACTA ACUST UNITED AC 1974. [DOI: 10.1002/mrc.1270060411] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Whelton BD, Lowry BR, Carr JB, Huitric AC. NMR study on 1,2,4,5-tetrasubstituted 3,3,6,6-tetradeuterated cyclohexanes: conformational contributions and 1,3-diaxial and vicinal deshielding effects of amino and alkylated amino groups and their protonated forms. J Pharm Sci 1973; 62:728-37. [PMID: 4705676 DOI: 10.1002/jps.2600620505] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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23
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NMR spectra and conformation of 2,6-dimethylnitro-3-cyclohexenes. Russ Chem Bull 1971. [DOI: 10.1007/bf00854311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Galpin DR, Cochran TG, Huitric AC. Application of nuclear magnetic resonance and optical rotatory dispersion to studies in drug metabolism--stereoselectivity in the metabolism of trans-2-p-tolyl-cyclohexanol and trans-2-o-tolylcyclohexanol in the rat. Biochem Pharmacol 1969; 18:979-91. [PMID: 5789796 DOI: 10.1016/0006-2952(69)90101-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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25
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Batterham TJ, Young IG. Reversal of the "twist" conformation of 2,3-dihydro-2,3-dihydroxybenzoic acid with change of solvent. Tetrahedron Lett 1969:945-8. [PMID: 5790163 DOI: 10.1016/s0040-4039(01)97705-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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26
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Moll F. Kondensierte Azetidinone-(2) 2. Mitt.: Die isomeren 3-Phenyl-1-azabicyclo[4,2,0]octanone-(2). Arch Pharm (Weinheim) 1968. [DOI: 10.1002/ardp.19683010404] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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28
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Ghatak U, Chakravarty J, Banerjee A. Synthetic studies directed to gibberellins and related compounds. Tetrahedron 1968. [DOI: 10.1016/s0040-4020(01)82464-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Espinosa FG, Trautwein WP, Paulsen H. Carboxoniumverbindungen in der Kohlenhydratchemie, VI. Untersuchungen über Reaktionen derD-Idose. Acetoxonium-Umlagerung derD-Idose zuD-Galaktose. ACTA ACUST UNITED AC 1968. [DOI: 10.1002/cber.19681010125] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Paulsen H, Espinosa FG, Trautwein WP, Heyns K. Carboxoniumverbindungen in der Kohlenhydratchemie, IV. Acetoxonium-Umlagerungen derD-Xylose. ACTA ACUST UNITED AC 1968. [DOI: 10.1002/cber.19681010123] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Trager WF, Huitric AC. Conformational analysis of 4-hydroxycyclohexanone oxime by NMR spectroscopy. J Pharm Sci 1967; 56:1111-4. [PMID: 6049696 DOI: 10.1002/jps.2600560913] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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33
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Paulsen H, Trautwein WP, Espinosa FG, Heyns K. Carboxoniumverbindungen in der Kohlenhydratchemie, III. Einfache Synthese vonD-Idose ausD-Glucose durch mehrfache Acetoxonium-Ion-Umlagerungen. Darstellung eines stabilen Acetoxonium-Salzes der Tetraacetyl-idose. ACTA ACUST UNITED AC 1967. [DOI: 10.1002/cber.19671000908] [Citation(s) in RCA: 52] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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34
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Trager WF, Nist BJ, Huitric AC. NMR conformational analysis of 4-hydroxycyclohexanone and 1,4-cyclohexanediols. Coupling constants averaging induced by conformational equilibria and by strong coupling effects--role of solvent. J Pharm Sci 1967; 56:698-704. [PMID: 6034801 DOI: 10.1002/jps.2600560607] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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35
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36
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Ayer WA, Jenkins JK, Piers K, Valverde-Lopez S. The alkaloids of Lycopodium cernuum L. II. The stereochemistry of cernuine and lycocernuine. CAN J CHEM 1967. [DOI: 10.1139/v67-078] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The relative stereochemistries of cernuine (I) and lycocernuine (II) have been derived by a combination of chemical and physical methods. Evidence is presented which indicates that I and II also represent the absolute stereochemistry of these alkaloids. The stereochemistry of allocernuine is discussed, and the isomerization of allocernuine into epiallocernuine is described.
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37
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Trager WF, Lee CM, Beckett AH. Corynantheidine-type alkaloids. I. Establishment of physical criteria for the normal, pseudo, allo and epiallo configurations by conformational analysis. Tetrahedron 1967; 23:365-74. [PMID: 6037286 DOI: 10.1016/s0040-4020(01)83322-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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38
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Kraus W, Suhr H. Lösungsmittel- und Konzentrationsabhängigkeit der NMR-Spektren voncis- undtrans-Bicyclo[3.2.1]octanol-(3). ACTA ACUST UNITED AC 1966. [DOI: 10.1002/jlac.19666950104] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Bannard RAB. CYCLOHEXANE COMPOUNDS: VI. NUCLEAR MAGNETIC RESONANCE SPECTRA OF SOME DERIVATIVES OF THE STEREOISOMERIC 3-BROMO-1,2-CYCLOHEXANEDIOLS AND THE 2-BROMO-1,3-CYCLOHEXANEDIOLS. CAN J CHEM 1966. [DOI: 10.1139/v66-111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
First-order analysis of the 60 Mc.p.s. proton magnetic resonance spectra of 1α-methoxy-2β-acetoxy-3α-bromocyclohexane, 1α-methoxy-2α-acetoxy-3β-bromocyclohexane, 1α-methoxy-2β-bromo-3α-acetoxycyclohexane, 1α-methoxy-2α-bromo-3β-acetoxycyclohexane, and the corresponding diol diacetates confirmed the stereochemical interrelationships of substituents which were assigned previously on chemical grounds, and demonstrated that the compounds exist in chair conformations. The chemical shifts of the methoxy methyl and acetoxy methyl protons did not provide reliable criteria for the assignment of conformations to these substituents in this series. The coupling constants of the methine protons followed, in general, the pattern predicted by the Karplus equation, and the smaller J2,3 values observed in the cis,trans compounds relative to those in the trans,trans compounds are interpreted mainly on the basis of conformational equilibration, upon which is superimposed a small dihedral angular distortion or a remote substituent orientational effect.
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40
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Huitric AC, Carr JB, Trager WF. NMR 1,3-diaxial deshielding effect of the hydroxyl group on ring hydrogens studied from partially deuterated six-membered ring compounds. J Pharm Sci 1966; 55:211-3. [PMID: 5923274 DOI: 10.1002/jps.2600550219] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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