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Yang S, Wu L, He Y, Li X. Identification of 3-hydroxyaspartate with two chiral centers by capillary electrophoresis-mass spectrometry and vibrational circular dichroism independent of single enantiomer standard. Anal Chim Acta 2024; 1323:343025. [PMID: 39182968 DOI: 10.1016/j.aca.2024.343025] [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: 05/15/2024] [Revised: 07/15/2024] [Accepted: 07/24/2024] [Indexed: 08/27/2024]
Abstract
BACKGROUND 3-Hydroxyaspartate(3-HA) is a non-proteinaceous amino acid whose four stereoisomers have different biological functions, making it meaningful to separate and analyze them. A combination of capillary zone electrophoresis-mass spectrometry (CZE-MS) and electron circular dichroism enables the separation and analysis of the four stereoisomers of 3-HA, but relies on enantiomeric standards. In contrast, the new method based on vibrational circular dichroism (VCD) can successfully confirm the peak order of the four enantiomers simultaneously without a single enantiomeric standard. This method is suitable for molecules without UV absorption, as well as for molecules with polychiral centers, and does not require enantiomeric standards. RESULTS We present a new analytical method based on CZE-MS coupled with VCD for the simultaneous determination of four stereoisomers of 3-HA with two chiral centers (D-threo-3-hydroxyaspartate, D-THA; L-threo-3-hydroxyaspartate, L-THA; D-erythro-3-hydroxyaspartate, D-EHA; L-erythro-3-hydroxyaspartate, L-EHA) in the absence of an optically pure single enantiomeric standard. The semipreparations of the non-racemic mixtures of DL-THA and DL-EHA were performed using high performance liquid chromatography (HPLC), with enantiomeric excess values reaching 90 %. By comparing the experimental VCD spectra of the DL-THA/DL-EHA mixture with the theoretical VCD spectra of the single L-THA/L-EHA enantiomer, the configuration of the dominant enantiomer in the nonracemic mixture was determined, where the two characteristic peaks in the 1250-1750 cm-1 spectral range fitted well. Finally, combined with the comparison of CE peak areas, the four stereoisomers were identified successfully. SIGNIFICANCE This is the first combined CZE-MS and VCD method for the simultaneous separation and analysis of four stereoisomers of 3-HA without relying on enantiomeric standards. This method is simple and reliable, and provides a new idea for the separation and analysis of chiral compounds with polychiral centers, which are difficult to obtain from enantiomeric standards.
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Affiliation(s)
- Sen Yang
- Department of Chemistry, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Li Wu
- Department of Chemistry, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Yujian He
- Department of Chemistry, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Xiangjun Li
- Department of Chemistry, University of Chinese Academy of Sciences, Beijing, 101408, China.
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2
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Vermeyen T, Cunha A, Bultinck P, Herrebout W. Impact of conformation and intramolecular interactions on vibrational circular dichroism spectra identified with machine learning. Commun Chem 2023; 6:148. [PMID: 37438485 DOI: 10.1038/s42004-023-00944-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 06/29/2023] [Indexed: 07/14/2023] Open
Abstract
Vibrational Circular Dichroism (VCD) spectra often differ strongly from one conformer to another, even within the same absolute configuration of a molecule. Simulated molecular VCD spectra typically require expensive quantum chemical calculations for all conformers to generate a Boltzmann averaged total spectrum. This paper reports whether machine learning (ML) can partly replace these quantum chemical calculations by capturing the intricate connection between a conformer geometry and its VCD spectrum. Three hypotheses concerning the added value of ML are tested. First, it is shown that for a single stereoisomer, ML can predict the VCD spectrum of a conformer from solely the conformer geometry. Second, it is found that the ML approach results in important time savings. Third, the ML model produced is unfortunately hardly transferable from one stereoisomer to another.
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Affiliation(s)
- Tom Vermeyen
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, Antwerpen, 2020, Belgium.
- Department of Chemistry, Ghent University, Krijgslaan 281, Gent, 9000, Belgium.
| | - Ana Cunha
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, Antwerpen, 2020, Belgium
| | - Patrick Bultinck
- Department of Chemistry, Ghent University, Krijgslaan 281, Gent, 9000, Belgium.
| | - Wouter Herrebout
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, Antwerpen, 2020, Belgium
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3
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Vermeyen T, Batista ANL, Valverde AL, Herrebout W, Batista JM. Pushing the boundaries of VCD spectroscopy in natural product chemistry. Phys Chem Chem Phys 2023; 25:13825-13832. [PMID: 37191271 DOI: 10.1039/d3cp00886j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Vibrational circular dichroism (VCD) is one of the most powerful techniques to assess the stereochemistry of chiral molecules in solution state. The need for quantum chemical calculations to interpret experimental data, however, has precluded its widespread use by non-experts. Herein, we propose the search and validation of IR and VCD spectral markers to circumvent the requirement of DFT calculations allowing for absolute configuration assignments even in complex mixtures. To that end, a combination of visual inspection and machine learning based methods is used. Monoterpene mixtures are selected for this proof-of-concept study.
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Affiliation(s)
- Tom Vermeyen
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
- Department of Chemistry, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium
| | - Andrea N L Batista
- Institute of Chemistry, Fluminense Federal University, Outeiro de São João Batista s/n, 24020-141 Niterói-RJ, Brazil
| | - Alessandra L Valverde
- Institute of Chemistry, Fluminense Federal University, Outeiro de São João Batista s/n, 24020-141 Niterói-RJ, Brazil
| | - Wouter Herrebout
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
| | - João M Batista
- Federal University of São Paulo, Institute of Science and Technology, R. Talim 330, 12231-280, São José dos Campos-SP, Brazil.
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4
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Ge R, Zhu Y, Wang H, Gu S. Methods and Application of Absolute Configuration Assignment for Chiral Compounds. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202108047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Tori M, Kuroda C. Chemical Constituents of Ligularia Species (Asteraceae) and Their Diversity in East Asia. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2021; 113:1-247. [PMID: 33721145 DOI: 10.1007/978-3-030-53028-0_1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
More than 100 Ligularia species and those of several related genera (Cremanthodium, Cacalia, Senecio, and others) in the plant family Senecioneae grow in East Asia. For many years, researchers have studied the chemical constituents of these plants, and terpenoids, flavonoids, sterols, alkaloids, and aromatic compounds have been isolated. Among these, in particular, numerous sesquiterpenoids were reported. In this contribution, relevant chemical studies are described mainly from literature reports appearing since 2000, inclusive of investigations performed by the present authors, on the diversity in secondary metabolites of Ligularia growing in the Hengduan Mountains area of China, focusing on eremophilane sesquiterpenoids and other metabolites. Terpenoids and aromatic compounds (totaling 1049), both new and known, are listed. Genetic studies and synthesis investigations are also reviewed briefly.
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Affiliation(s)
- Motoo Tori
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan.
| | - Chiaki Kuroda
- Department of Chemistry, Rikkyo University, Tokyo, Japan
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6
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del Río RE, Joseph-Nathan P. Vibrational Circular Dichroism Absolute Configuration of Natural Products From 2015 to 2019. Nat Prod Commun 2021. [DOI: 10.1177/1934578x21996166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Although demonstrated in 1975, vibrational circular dichroism (VCD) finally started to popularize during this century as a reliable tool to determine the absolute configuration (AC) of organic molecules. This research field continues to be a very dynamic one, in particular for the study of natural products which are a unlimited source of chiral molecules. It therefore turns of interest to summarize the accomplishments published in recent years and to comment on some eventual difficulties that emerged in rare cases to complete the AC determination task. Therefore the aim of this review is to update VCD results for the AC assignment of natural products published from 2015 to 2019, a period in which VCD was reported in some 126 publications involving almost 300 molecules. They are organized according the type of studied metabolite allowing an easily search. The molecules correspond to 28 monoterpenes concerning 17 papers, to 42 sesquiterpenes in 14 papers, to 51 diterpenes in 19 publications, to 5 other terpenoids in three papers, to 48 aromatic molecules in 15 reports, to 20 polyketides in 10 publications, to 27 miscellaneous formulas also in 10 papers, and to 76 nitrogen containing compounds, which include alkaloids and their synthetic analogs, in 38 articles. The landscape of reviewed molecules is quite wide as it goes from simple monoterpenes, like borneol or camphor, to very relevant biological molecules like the alkaloid cocaine or tadalafil samples to distinguish genuine and counterfeit Cialis®. In addition, 5 natural products and a simple derivative published outside the reviewed period, were used to illustrate some aspects of density functional theory calculations.
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Affiliation(s)
- Rosa E. del Río
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Morelia, Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
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7
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Quevedo-Tinoco L, Rodríguez-García G, del Río RE, Talero E, Motilva V, Cerda-García-Rojas CM, Joseph-Nathan P, Gómez-Hurtado MA. Strategy for the vibrational circular dichroism study of a glycosylflavonoid evaluated as its peracetate. The case of bioactive 7-O-β-D-glucopyranosylchrysin. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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8
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Hong SS, Lee JE, Jung YW, Park JH, Lee JA, Jeong W, Ahn EK, Choi CW, Oh JS. Monoterpenoids from the Fruits of Amomum tsao-ko Have Inhibitory Effects on Nitric Oxide Production. PLANTS (BASEL, SWITZERLAND) 2021; 10:257. [PMID: 33525660 PMCID: PMC7911220 DOI: 10.3390/plants10020257] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/25/2021] [Accepted: 01/25/2021] [Indexed: 11/16/2022]
Abstract
In our search for novel plant-derived inhibitors of nitric oxide (NO) with potential for treating inflammatory diseases, the phytochemicals of Amomum tsao-ko fruits were investigated, leading to the isolation of one bicyclic nonane (1), three menthene skeleton monoterpenoids (2-4), and two acyclic monoterpenoids (5 and 6). Their structures were identified using one- and two-dimensional nuclear magnetic resonance spectroscopy, and mass spectrometry. To the best of our knowledge, compounds 2-5 were obtained from the genus Amomum for the first time. All isolates were tested for their ability to inhibit lipopolysaccharide-stimulated NO overproduction in RAW264.7 cells. Compound 4 was found to inhibit NO production. Western blotting analysis indicated that active compound 4 can regulate inducible NO synthase expression. In addition, lipopolysaccharide-induced interleukin 1 beta and interleukin-6 overproduction was reduced in a concentration-dependent manner.
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Affiliation(s)
- Seong Su Hong
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Ji Eun Lee
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Yeon Woo Jung
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Ju-Hyoung Park
- College of Pharmacy, Dankook University, Cheonan 31116, Korea;
| | - Jung A. Lee
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Wonsik Jeong
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Eun-Kyung Ahn
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Chun Whan Choi
- Bio-Center, Gyeonggido Business & Science Accelerator (GBSA), Suwon 16229, Korea; (J.E.L.); (Y.W.J.); (J.A.L.); (W.J.); (E.-K.A.); (C.W.C.)
| | - Joa Sub Oh
- College of Pharmacy, Dankook University, Cheonan 31116, Korea;
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9
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Polavarapu PL, Santoro E. Vibrational optical activity for structural characterization of natural products. Nat Prod Rep 2020; 37:1661-1699. [DOI: 10.1039/d0np00025f] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This review presents the recent progress towards elucidating the structures of chiral natural products and applications using vibrational optical activity (VOA) spectroscopy.
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10
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Arreaga-González HM, Rodríguez-García G, Del Río RE, Ferreira-Sereno JA, García-Gutiérrez HA, Cerda-García-Rojas CM, Joseph-Nathan P, Gómez-Hurtado MA. Configurational Variation of a Natural Compound within Its Source Species. The Unprecedented Case of Areolal in Piptothrix areolare. JOURNAL OF NATURAL PRODUCTS 2019; 82:3394-3400. [PMID: 31751133 DOI: 10.1021/acs.jnatprod.9b00734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The exceptional case of a natural compound that shows drastic absolute configuration variations within the same species was examined. Sequential samples of areolal (1) isolated from Piptothrix areolare showed dextrorotatory (ee 32%), almost racemic (ee 4%), levorotatory (ee 82%), and again dextrorotatory (ee 10%) values. Enantiomeric compositions of this epoxythymol derivative were determined from individual plant specimens collected from the same geographical location over a 46-day period, which were processed using the same extraction and isolation methods. Detection of this unusual phenomenon was possible by analysis of NMR data recorded in the presence of BINOL as a chiral solvating agent. The absolute configuration of (-)-(8S)-areolal followed from vibrational circular dichroism data of an enantiomerically enriched sample, while single-crystal X-ray diffraction and supramolecular analyses revealed interactions that diminish the crystal entropy in rac-1. These results might be related with environmental factors and biochemical processes, suggesting the need of strict evaluations of enantiomeric composition of natural products that could be considered for human applications.
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Affiliation(s)
- Héctor M Arreaga-González
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Gabriela Rodríguez-García
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Rosa E Del Río
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - José A Ferreira-Sereno
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Hugo A García-Gutiérrez
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Carlos M Cerda-García-Rojas
- Departamento de Química , Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740 , Mexico City 07000 , Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química , Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740 , Mexico City 07000 , Mexico
| | - Mario A Gómez-Hurtado
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
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11
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El-Kashef DH, Daletos G, Plenker M, Hartmann R, Mándi A, Kurtán T, Weber H, Lin W, Ancheeva E, Proksch P. Polyketides and a Dihydroquinolone Alkaloid from a Marine-Derived Strain of the Fungus Metarhizium marquandii. JOURNAL OF NATURAL PRODUCTS 2019; 82:2460-2469. [PMID: 31432669 DOI: 10.1021/acs.jnatprod.9b00125] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Three new natural products (1-3), including two butenolide derivatives (1 and 2) and one dihydroquinolone derivative (3), together with nine known natural products were isolated from a marine-derived strain of the fungus Metarhizium marquandii. The structures of the new compounds were unambiguously deduced by spectroscopic means including HRESIMS and 1D/2D NMR spectroscopy, ECD, VCD, OR measurements, and calculations. The absolute configuration of marqualide (1) was determined by a combination of modified Mosher's method with TDDFT-ECD calculations at different levels, which revealed the importance of intramolecular hydrogen bonding in determining the ECD features. The (3R,4R) absolute configuration of aflaquinolone I (3), determined by OR, ECD, and VCD calculations, was found to be opposite of the (3S,4S) absolute configuration of the related aflaquinolones A-G, suggesting that the fungus M. marquandii produces aflaquinolone I with a different configuration (chiral switching). The absolute configuration of the known natural product terrestric acid hydrate (4) was likewise determined for the first time in this study. TDDFT-ECD calculations allowed determination of the absolute configuration of its chirality center remote from the stereogenic unsaturated γ-lactone chromophore. ECD calculations aided by solvent models revealed the importance of intramolecular hydrogen bond networks in stabilizing conformers and determining relationships between ECD transitions and absolute configurations.
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Affiliation(s)
- Dina H El-Kashef
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
- Department of Pharmacognosy, Faculty of Pharmacy , Minia University , 61519 Minia , Egypt
| | - Georgios Daletos
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
| | - Malte Plenker
- Institute of Complex Systems: Strukturbiochemie , Forschungszentrum Jülich GmbH , ICS-6, 52425 Jülich , Germany
| | - Rudolf Hartmann
- Institute of Complex Systems: Strukturbiochemie , Forschungszentrum Jülich GmbH , ICS-6, 52425 Jülich , Germany
| | - Attila Mándi
- Department of Organic Chemistry , University of Debrecen , P.O.B. 400, 4002 Debrecen , Hungary
| | - Tibor Kurtán
- Department of Organic Chemistry , University of Debrecen , P.O.B. 400, 4002 Debrecen , Hungary
| | - Horst Weber
- Institut für Pharmazeutische und Medizinische Chemie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
| | - Wenhan Lin
- State Key Laboratory of Natural and Biomimetic Drugs , Peking University , Beijing 100191 , China
| | - Elena Ancheeva
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
| | - Peter Proksch
- Institut für Pharmazeutische Biologie und Biotechnologie , Heinrich-Heine-Universität Düsseldorf , Universitätsstrasse 1 , 40225 Düsseldorf , Germany
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12
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Rodríguez-García G, Villagómez-Guzmán AK, Talavera-Alemán A, Cruz-Corona R, Gómez-Hurtado MA, Cerda-García-Rojas CM, Joseph-Nathan P, Del Río RE. Conformational, configurational, and supramolecular studies of podocephalol acetate from Lasianthaea aurea. Chirality 2019; 31:923-933. [PMID: 31454433 DOI: 10.1002/chir.23042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 11/19/2018] [Accepted: 11/20/2018] [Indexed: 11/06/2022]
Abstract
Although podocephalol (1) and its derived acetate 2 were found in Lasianthaea podocephala four decades ago, and 1 was later detected in the essential oils of several vegetal species, its absolute configuration (AC) and conformational preferences remained to be established. The structures of ar-himachalene 1, now isolated from Lasianthaea aurea, and its derived acetate 2, were herein confirmed by extensive 1D and 2D nuclear magnetic resonance (NMR) studies, while the conformational preferences of the cycloheptene was established by density functional theory (DFT) calculations, which in combination with vibrational circular dichroism measurements provided the (R) absolute configuration of the molecules. The structure and AC were further verified through the Flack and Hooft parameters calculations derived from single crystal X-ray diffraction data of 2. In addition, careful evaluation of the crystal data allowed observing supramolecular layers cell package, an uncommon property in natural terpenes that might have potential applications. A transmission electron microscopy analysis of crystal of 2 was also possible, providing its physical characteristics at the micrometric scale.
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Affiliation(s)
- Gabriela Rodríguez-García
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Ana K Villagómez-Guzmán
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Armando Talavera-Alemán
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Rosalba Cruz-Corona
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Mario A Gómez-Hurtado
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Carlos M Cerda-García-Rojas
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Rosa E Del Río
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
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13
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Pardo-Novoa JC, Arreaga-González HM, Galván-Gómez S, Rodríguez-García G, Del Río RE, Cerda-García-Rojas CM, Joseph-Nathan P, Gómez-Hurtado MA. Biomimetic Transformation of p-Menthene Glucosides into p-Cymenes and Carvotanacetone. JOURNAL OF NATURAL PRODUCTS 2019; 82:485-491. [PMID: 30776238 DOI: 10.1021/acs.jnatprod.8b00855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A biomimetic transformation of p-menthene glucosides into aromatic monoterpenoids that alluded to mechanisms for essential oil metabolism, which lines up with the precepts of molecular economy, is described. Acid treatment of (-)-(3 S,4 S,6 R)-3,6-dihydroxy-1-menthene 3- O-β-d-glucopyranoside (1) and (-)-(3 S,4 R,5 R,6 S)-3,5,6-trihydroxy-1-menthene 3- O-β-d-glucopyranoside (2), from Ageratina glabrata, yielded p-cymene (7) and carvacrol (9). The stable oxidized intermediates (+)-(3 S,4 S,6 R)-3,6-dihydroxy-1-menthene (3), (+)-(1 S,4 S,6 R)-1,6-dihydroxy-2-menthene (4), (+)-(1 R,4 S,6 R)-1,6-dihydroxy-2-menthene (5), (+)-(4 S,6 R)-yabunikkeol (6), (+)-(4 S)-carvotanacetone (8), (+)-(1 S,4 S,5 R,6 R)-1,5,6-trihydroxy-2-menthene (15), (+)-(1 R,4 S,5 R,6 R)-1,5,6-trihydroxy-2-menthene (16), and the new (+)-(4 S,5 R,6 S)-1(7),2-menthadiene (17) permitted establishment of the reaction mechanisms. The reactivity of the hydroxy groups of 4 and 5, as well as those of 15 and 16, was compared by acetylation reactions and supported by DFT calculations, revealing diminished reactivity in 4 and 15 due to the cis configuration of their hydroxy groups at C-1 and C-6. In addition, p-cymene (7) was detected as one of the major constituents of the essential oil of A. glabrata, which matches well with the biomimetic study.
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Affiliation(s)
- Julio C Pardo-Novoa
- Departamento de Química , Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740 , Mexico City 07000 , Mexico
| | - Héctor M Arreaga-González
- Instituto de Investigaciones Químico-Biológicas , Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Sinuhé Galván-Gómez
- Instituto de Investigaciones Químico-Biológicas , Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Gabriela Rodríguez-García
- Instituto de Investigaciones Químico-Biológicas , Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Rosa E Del Río
- Instituto de Investigaciones Químico-Biológicas , Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
| | - Carlos M Cerda-García-Rojas
- Departamento de Química , Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740 , Mexico City 07000 , Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química , Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740 , Mexico City 07000 , Mexico
| | - Mario A Gómez-Hurtado
- Instituto de Investigaciones Químico-Biológicas , Universidad Michoacana de San Nicolás de Hidalgo , Ciudad Universitaria , Morelia , Michoacán 58030 , Mexico
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14
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Arreaga-González HM, Pardo-Novoa JC, Del Río RE, Rodríguez-García G, Torres-Valencia JM, Manríquez-Torres JJ, Cerda-García-Rojas CM, Joseph-Nathan P, Gómez-Hurtado MA. Methodology for the Absolute Configuration Determination of Epoxythymols Using the Constituents of Ageratina glabrata. JOURNAL OF NATURAL PRODUCTS 2018; 81:63-71. [PMID: 29278331 DOI: 10.1021/acs.jnatprod.7b00637] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A methodology to determine the enantiomeric excess and the absolute configuration (AC) of natural epoxythymols was developed and tested using five constituents of Ageratina glabrata. The methodology is based on enantiomeric purity determination employing 1,1'-bi-2-naphthol (BINOL) as a chiral solvating agent combined with vibrational circular dichroism (VCD) measurements and calculations. The conformational searching included an extensive Monte Carlo protocol that considered the rotational barriers to cover the whole conformational spaces. (+)-(8S)-10-Benzoyloxy-6-hydroxy-8,9-epoxythymol isobutyrate (1), (+)-(8S)-10-acetoxy-6-methoxy-8,9-epoxythymol isobutyrate (4), and (+)-(8S)-10-benzoyloxy-6-methoxy-8,9-epoxythymol isobutyrate (5) were isolated as enantiomerically pure constituents, while 10-isobutyryloxy-8,9-epoxythymol isobutyrate (2) was obtained as a 75:25 (8S)/(8R) scalemic mixture. In the case of 10-benzoyloxy-8,9-epoxythymol isobutyrate (3), the BINOL methodology revealed a 56:44 scalemic mixture and the VCD measurement was beyond the limit of sensitivity since the enantiomeric excess is only 12%. The racemization process of epoxythymol derivatives was studied using compound 1 and allowed the clarification of some stereochemical aspects of epoxythymol derivatives since their ACs have been scarcely analyzed and a particular behavior in their specific rotations was detected. In more than 30 oxygenated thymol derivatives, including some epoxythymols, the reported specific rotation values fluctuate from -1.6 to +1.4 passing through zero, suggesting the presence of scalemic and close to racemic mixtures, since enantiomerically pure natural constituents showed positive or negative specific rotations greater than 10 units.
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Affiliation(s)
- Héctor M Arreaga-González
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria , Morelia, Michoacán 58030, Mexico
| | - Julio C Pardo-Novoa
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria , Morelia, Michoacán 58030, Mexico
| | - Rosa E Del Río
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria , Morelia, Michoacán 58030, Mexico
| | - Gabriela Rodríguez-García
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria , Morelia, Michoacán 58030, Mexico
| | - J Martín Torres-Valencia
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo , Km 4.5 Carretera Pachuca-Tulancingo, Mineral de la Reforma, Hidalgo 42184, Mexico
| | - J Jesús Manríquez-Torres
- Centro de Investigación Interdisciplinario. Área Académica de Nutrición, Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo. Circuito Actopan-Tilcuautla s/n. Ex hacienda La Concepción , San Agustín Tlaxiaca, Hidalgo 42160, Mexico
| | - Carlos M Cerda-García-Rojas
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740, Mexico City, 07000, Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Apartado 14-740, Mexico City, 07000, Mexico
| | - Mario A Gómez-Hurtado
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria , Morelia, Michoacán 58030, Mexico
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15
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Górecki M, Groszek G, Frelek J. Chirality sensing of bioactive compounds with amino alcohol unit via circular dichroism. Chirality 2017; 29:589-598. [PMID: 28771833 DOI: 10.1002/chir.22736] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Revised: 06/24/2017] [Accepted: 06/26/2017] [Indexed: 12/31/2022]
Abstract
The aim of the present work was to test various chiroptical techniques, including in particular the in situ dirhodium methodology, to assign the absolute configuration of 1,2- and 1,3-amino alcohols. As models, we selected mainly compounds that have both an additional strongly absorbing and interfering chromophoric system and application in medicinal chemistry. Determination of the absolute configuration (AC) of the tested molecules such as cinchona alkaloids, Tamiflu, and others was carried out using a combination of electronic and vibrational circular dichroism (ECD, VCD) spectroscopy. It has been demonstrated that both 1,2- and 1,3-aminol moieties are subject to the same sector rule correlating stereostructure of formed Rh2 -complex with chiroptical properties, and that the changes in the position of the stereogenic center do not affect its proper use.
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Affiliation(s)
- Marcin Górecki
- Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw, Poland
| | - Grażyna Groszek
- Faculty of Chemistry, Rzeszów University of Technology, Rzeszów, Poland
| | - Jadwiga Frelek
- Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw, Poland
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16
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Merten C, Dirkmann M, Schulz F. Stereochemical assignment of fusiccocadiene from NMR shielding constants and vibrational circular dichroism spectroscopy. Chirality 2017; 29:409-414. [DOI: 10.1002/chir.22708] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 03/06/2017] [Accepted: 03/15/2017] [Indexed: 01/13/2023]
Affiliation(s)
- Christian Merten
- Organic Chemistry 2, Physical Organic Chemistry; Ruhr-University Bochum; Bochum Germany
| | - Michael Dirkmann
- Organic Chemistry 1, Natural Products Chemistry; Ruhr-University Bochum; Bochum Germany
| | - Frank Schulz
- Organic Chemistry 1, Natural Products Chemistry; Ruhr-University Bochum; Bochum Germany
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