1
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Muñoz MA, Burgueño-Tapia E, Joseph-Nathan P. Individual scale factor approach for the vibrational circular dichroism similarity-guided spectral and conformational analysis of perezone and dihydroperezone. Chirality 2023; 35:67-79. [PMID: 36398355 DOI: 10.1002/chir.23517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 10/18/2022] [Accepted: 11/04/2022] [Indexed: 11/19/2022]
Abstract
Evaluation of DFT calculated vibrational parameters for the IR and VCD spectra similarity of perezone (1) and dihydroperezone (2) was undertaken. Conformational sets were obtained using different search engines, and the parameters needed for spectra prediction were obtained using several combinations of commonly employed functionals and basis sets, and then weighted spectra were generated and compared with observed traces to provide infrared similarity (SIR ) and enantiomeric similarity index (ESI) values. These values evidenced a poor performance of the evaluated levels of theory that were overcome when using the individual scaling factors approach, providing 16% to 139% increases of the ESI values. The best performing level of theory was the B3LYP/DGDZVP2 with ESI values of 0.722 and 0.792 for 1 and 2. Moreover, a correlation analysis showed that the irregular DFT performance arises from rotational strength deviations, which suggests to discard conformational abundance accuracy as the main source of differences. Furthermore, a similarity guided conformational analysis showed that conformations with high ESI values prefer particular orientations of the CC bonds directly attached to the stereogenic carbon atom, with more distant dihedral angles having less influence. Additionally, folded and extended conformers appear to be equally capable to yield high individual ESI values, although abundances of folded conformers just account for 16% of the total population. Nevertheless, abundance optimization showed that a high ESI similarity value of 0.834, is possible when the population of these conformers is increased to 26%, suggesting that a larger abundance of these conformers might be present in solution.
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Affiliation(s)
- Marcelo A Muñoz
- Instituto de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, 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
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2
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Burgueño-Tapia E, Fernández MD, Joseph-Nathan P. Vibrational Circular Dichroism Study of Pipitzols and of Their Inverse Epimer Constituents α- and β-Pipitzol. Nat Prod Commun 2022. [DOI: 10.1177/1934578x221127970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Inverse epimers are uncommon in nature and a lack of study of their vibrational circular dichroism (VCD) behavior seems evident. This is relevant, among other facts, since in the case of epimers, VCD has been capable of determining the absolute configuration (AC) of 1 stereogenic center in a molecule having 10 stereogenic centers. The case of pipitzol is unique since it took 80 years from its first preparation by thermal intramolecular cycloaddition of perezone (1) to know that the reaction outcome is an equimolar mixture of the 2 inverse epimers α-pipitzol (2: 3 R, 3a R, 7 R, and 8a S) and β-pipitzol (3: 3 R, 3a S, 7 S, and 8a R). Evaluation of 2 and 3 reveals that some VCD bands have an opposite phase while other bands show the same phase. The VCD spectrum of the naturally occurring equimolecular mixture was also measured and the 3 experimental spectra were contrasted with density functional theory (DFT) calculated spectra allowing individual band assignments. The comparisons were made in the 1800 to 950 and 1550 to 950 cm−1 ranges and the numerical differences are highlighted thereby showing that carbonyl bands influence such comparisons. The 2 carbonyl absorption bands of 2 and 3 show weak VCD bands and the conjugated double bond band provides an intense AC-dependent VCD band.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Mexico City, Mexico
| | - Mónica Díaz Fernández
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Mexico City, 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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3
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Velasco-Azorsa R, Zeferino-Díaz R, Alvarado-Rodríguez JG, López-Ruiz H, Rojas-Lima S, Flores-Castro K, Del Prado-Vera IC, Alatorre-Rosas R, Tut-Pech F, Carrillo-Benítez MG, Burgueño-Tapia E, Torres-Valencia JM. Nematicidal activity of furanoeremophilenes against Meloidogyne incognita and Nacobbus aberrans. Pest Manag Sci 2022; 78:2571-2580. [PMID: 35338557 DOI: 10.1002/ps.6888] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/10/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND While searching for novel small molecules for new organic pesticide agents against plant-parasitic nematodes, we found that the hexane extract from the roots of Senecio sinuatos and its main secondary metabolite, 3β-angeloyloxy-6β-hydroxyfuranoeremophil-1(10)-ene (1), possess nematicidal activity against the second stage juvenile (J2) of Meloidogyne incognita and Nacobbus aberrans. Both species reduce yield of various vegetable crops. These results encouraged us to synthesize esters 3-9 formed by diol 2, obtained by alkaline hydrolysis of 1 and acetic anhydride, benzoic acid, 2-nitrobenzoic acid, 2-bromobenzoic acid, 4-nitrobenzoic acid, 4-bromobenzoic acid, and 4-methoxybenzoic acid, respectively. The nematicidal activity of these esters was evaluated and compared with that of the free benzoic acids. RESULTS Natural product 1 and derivatives 2-9 were obtained and characterized by their physical and spectroscopic properties, including one-dimensional (1D) and two-dimensional (2D) nuclear magnetic resonance (NMR) experiments; X-ray diffraction analysis established their absolute configuration. The nematicidal activity of compounds 1-9 was assessed in vitro against M. incognita and N. aberrans J2 and was compared to activity shown by benzoic acid, 2-nitrobenzoic acid, 2-bromobenzoic acid, 4-nitrobenzoic acid, 4-bromobenzoic acid, and 4-methoxybenzoic acid. The esters suppressed nematodes more than free benzoic acid. Nacobbus aberrans J2 were suppressed, with compounds 5, 6, and 8 being the most active. CONCLUSION Esters formed by 3β,6β-dihydroxyfuranoeremophil-1(10)-ene and ortho- or para-substituted benzoic acids containing electron acceptor groups had nematicidal activity against N. aberrans. These compound can potentially serve as a model for the development of new organic nematicidal agents. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Raúl Velasco-Azorsa
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
| | - Reyna Zeferino-Díaz
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
| | - José G Alvarado-Rodríguez
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
| | - Heraclio López-Ruiz
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
| | - Susana Rojas-Lima
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
| | - Kinardo Flores-Castro
- Cuerpo Académico de Ciencias de la Tierra, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
| | | | | | - Felipe Tut-Pech
- Instituto de Fitosanidad, Colegio de Postgraduados, Texcoco, Mexico
| | | | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional, Mexico City, Mexico
| | - J Martín Torres-Valencia
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Mexico
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4
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Fuentes-Figueroa MÁ, Tlapale-Lara N, Hernández-Carlos B, Joseph-Nathan P, Burgueño-Tapia E. A new germacranolide from Ageratina vernalis. Nat Prod Res 2022; 36:2254-2262. [DOI: 10.1080/14786419.2020.1827400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Miguel Á. Fuentes-Figueroa
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Mexico City, Mexico
| | - Neively Tlapale-Lara
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Mexico City, Mexico
| | | | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Mexico City, Mexico
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5
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Fuentes-Figueroa MÁ, Joseph-Nathan P, Burgueño-Tapia E. Absolute configuration assignment of stigmasterol oxiranes. Chirality 2021; 34:396-420. [PMID: 34788903 DOI: 10.1002/chir.23390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/06/2021] [Accepted: 10/23/2021] [Indexed: 12/28/2022]
Abstract
Diastereoisomeric stigmasterol oxiranes 4, 5, 8, and 9 are known phytosterol oxidation products (POPs) that have been evaluated for their cytotoxicity, although the results are of limited significance since, in most cases, they were evaluated as mixtures. Consequently, to establish biological activity hierarchy of these oxides, it is critical to evaluate individual pure POPs. Therefore, we now describe the obtention of individual molecules and their absolute configuration (AC) determination. The two acetylated C-5-C-6 oxiranes 6 and 7; the two acetylated C-22-C-23 oxides 10 and 11, obtained by means of Δ5 double bond protection-deprotection; and the four C-5-C-6, C-22-C-23 diepoxystigmasteryl acetates 19-22 were now individually gained and their AC determined by vibrational circular dichroism. Vibrational modes associated with the C-5-C-6 and the C-22-C-23 bonds were identified in dioxiranes 19-22 and used to assign the AC of monoepoxides 6, 7, 10, and 11. The AC of biological active non-acetylated molecules follows immediately. Due to the scarce spectroscopic information available for these POPs, the 1 H and 13 C NMR chemical shifts of 3-22 were assigned using 1D- and 2D-NMR experiments.
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Affiliation(s)
- Miguel Á Fuentes-Figueroa
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, 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
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
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6
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Martínez-Pérez EF, Burgueño-Tapia E, Roa-Flores S, Bendaña-Piñeiro AE, Sánchez-Arreola E, Bach H, Hernández LR. A new diterpene and bioactivities of labdanes isolated from Buddleja marrubiifolia. Nat Prod Res 2020; 36:71-78. [PMID: 32375531 DOI: 10.1080/14786419.2020.1762184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The new labdane [(3R*,4aR*,7S*,10aS*,10bR*)-3-ethenyl-3,4a,7,10a-tetramethyl-dodecahydro-1H-naphtho-[2,1-b]-pyran-7-yl]-methylbenzoate together with other 7 labdanes were isolated from the aerial parts of Buddleja marrubiifolia. Compound structures were elucidated by spectroscopic methods. Some compounds showed moderate to weak antimicrobial activity towards a panel of bacterial and fungal pathogens. In addition, trans-biformene (2) and ribenol acetate (8) showed to be highly cytotoxic with LC50 < 1 µg/mL, the other compounds showed moderate cytotoxic effect with a LC50 range of 6.008-15.26 µg/mL. For all isolated compounds, no inflammatory response was observed.
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Affiliation(s)
- Edith Fabiola Martínez-Pérez
- Departamento de Ciencias Químico Biológicas, Universidad de las Américas Puebla, San Andrés Cholula, Puebla, Mexico
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Samuel Roa-Flores
- Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León, Mexico.,Department of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, BC, Canada
| | - Aranza E Bendaña-Piñeiro
- Department of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, BC, Canada.,Sección de Patología Experimental, Departamento de Patología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Tlalpan, Ciudad de México, Mexico
| | - Eugenio Sánchez-Arreola
- Departamento de Ciencias Químico Biológicas, Universidad de las Américas Puebla, San Andrés Cholula, Puebla, Mexico
| | - Horacio Bach
- Department of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, BC, Canada
| | - Luis Ricardo Hernández
- Departamento de Ciencias Químico Biológicas, Universidad de las Américas Puebla, San Andrés Cholula, Puebla, Mexico
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7
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Díaz-Fernández M, Salazar MI, Joseph-Nathan P, Burgueño-Tapia E. Configurational Study of Diastereoisomeric Royleanone Diterpenoids From Salvia concolor. Nat Prod Commun 2019. [DOI: 10.1177/1934578x19862650] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The known diterpenoids horminone (1) and taxoquinone (2) as a mixture, and pure 6,7-dehydroroyleanone (7) were isolated from the aerial parts of not yet studied Salvia concolor Lamb. Although 1 and 2 are known, the 1H Nuclear Magnetic Resonance (NMR) data of their acetyl derivatives 4 to 6 are only partially described. Moreover, the 13C NMR data assignments for 4 and 6 show some inconsistencies and reveal better agreement with those we obtained for diastereoisomeric 3 and 5. Since stereochemical aspects were in doubt, it was considered as mandatory to unambiguously determine the absolute configuration of 3 to 6 using vibrational circular dichroism spectroscopy, which then allowed the complete 1H and 13C NMR chemical shift assignments of 4 to 6.
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Affiliation(s)
- Mónica Díaz-Fernández
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - María I. Salazar
- Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, 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
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
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8
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Bustos-Brito C, Joseph-Nathan P, Burgueño-Tapia E, Martínez-Otero D, Nieto-Camacho A, Calzada F, Yépez-Mulia L, Esquivel B, Quijano L. Structure and Absolute Configuration of Abietane Diterpenoids from Salvia clinopodioides: Antioxidant, Antiprotozoal, and Antipropulsive Activities. J Nat Prod 2019; 82:1207-1216. [PMID: 31063376 DOI: 10.1021/acs.jnatprod.8b00952] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aerial parts of Salvia clinopodioides afforded abietanes 1a, 2a, and 3 (clinopodiolides A-C), two of which possess an unusual lactol moiety at C-19-C-20, together with an icetexane named clinopodiolide D (4a). Their structures were established by spectroscopic means, mainly 1H and 13C NMR, including 1D and 2D homo- and heteronuclear experiments. The antioxidant, antiprotozoal, and antidiarrheal effects of the isolates were evaluated. Compounds 2a and 3 showed better effects than α-tocopherol in the inhibition of lipid peroxidation with IC50 (μM) = 5.9 ± 0.1 and 2.7 ± 0.2, respectively, and moderate activity in the DPPH assay. All tested compounds showed moderate antiamoebic and antigiardial activity, as well as a good antipropulsive effect.
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Affiliation(s)
- Celia Bustos-Brito
- Instituto de Química , Universidad Nacional Autónoma de México , Circuito Exterior, Ciudad Universitaria, Mexico City , 04510 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
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas , Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala , Col. Santo Tomás , Mexico City , 11340 Mexico
| | - Diego Martínez-Otero
- Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM , Carretera Toluca-Atlacomulco, km. 14.5, Toluca , 50200 Mexico
| | - Antonio Nieto-Camacho
- Instituto de Química , Universidad Nacional Autónoma de México , Circuito Exterior, Ciudad Universitaria, Mexico City , 04510 Mexico
| | | | | | - Baldomero Esquivel
- Instituto de Química , Universidad Nacional Autónoma de México , Circuito Exterior, Ciudad Universitaria, Mexico City , 04510 Mexico
| | - Leovigildo Quijano
- Instituto de Química , Universidad Nacional Autónoma de México , Circuito Exterior, Ciudad Universitaria, Mexico City , 04510 Mexico
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9
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Ortega AR, Burgueño-Tapia E, Joseph-Nathan P. Difficulties to Determine the Absolute Configuration of Guaiaretic Acid. Nat Prod Commun 2018. [DOI: 10.1177/1934578x1801300815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
An account of the difficulties to determine the absolute configuration (AC) of guaiaretic acid (1a), using contemporary methodology, is described in commemoration of the century of its structure elucidation. In fact, the herein studied molecule was the derived diacetate 1b, since the natural lignan slowly decomposes upon manipulation. Single crystal X-ray diffraction of 1b demonstrated the structure, but calculation of Flack and Hooft parameters to know the AC was unsuccessful since the crystals were triclinic, P-1, which is a centro-symmetric space group. In turn, manual band to band comparison of experimental and DFT B3LYP/DGDZVP calculated VCD spectra of 1b allowed ascertaining its AC, although automatic comparison using the Compare VOA software was not very successful. This behavior is associated to the fact that the studied molecule has a sole stereogenic center located on the acyclic portion of a carbon chain possessing two quite similar substituents. The behavior is discussed in relation to cases where the molecular flexibility also generates a very large number of conformers.
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Affiliation(s)
- Alfredo R. Ortega
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Mexico City, 04510 Mexico
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, Mexico City, 11340 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
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10
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Ontiveros-Rodríguez JC, Burgueño-Tapia E, Porras-Ramírez J, Joseph-Nathan P, Zepeda LG. Configurational Study of an Aporphine Alkaloid from Annona purpurea. Nat Prod Commun 2018. [DOI: 10.1177/1934578x1801300711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Purpureine (1), norpurpureine (2), and 3-hydroxyglaucine (4) were isolated from the leaves of Annona purpurea. A vibrational circular dichroism study for the absolute configuration determination of 1 provides evidence for the mutually dependent atropisomerism, local chirality of the sole stereogenic center, and the geometry of the tetrahedral nitrogen atom in aporphine alkaloids. The observed change in the optical rotation sign between 2 and its hydrochloride 3 might explain why this compound has been reported as dextrorotatory and levorotatory from the same botanical source. Furthermore, 1H and 13C NMR spectra of 1, 2 and 4 were fully assigned for the first time.
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Affiliation(s)
- Julio C. Ontiveros-Rodríguez
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomas, Mexico City, 11340, Mexico
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomas, Mexico City, 11340, Mexico
| | - Javier Porras-Ramírez
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomas, Mexico City, 11340, 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
| | - L. Gerardo Zepeda
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomas, Mexico City, 11340, Mexico
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11
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Esquivel B, Burgueño-Tapia E, Bustos-Brito C, Pérez-Hernández N, Quijano L, Joseph-Nathan P. Absolute configuration of the diterpenoids icetexone and conacytone from Salvia ballotaeflora. Chirality 2017; 30:177-188. [PMID: 29110401 DOI: 10.1002/chir.22781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/03/2017] [Accepted: 10/04/2017] [Indexed: 11/10/2022]
Abstract
Detailed literature inspections regarding the diterpenoids icetexone (1) and conacytone (3) reveal that the absolute configuration (AC) of these natural occurring compounds is not rigorously proven, despite they were originally isolated in 1976. This task is now completed by single-crystal X-ray diffraction Flack and Hooft parameters determination after processing data collected with Cu Kα graphite monochromated radiation. The AC of both compounds is further determined by vibrational circular dichroism measurements performed on icetexone acetate (2) and conacytone triacetate (4) since the solubility of 1 and 3 is limited. Comparison of the substituent chemical shifts (SCS) induced by acetylation of 1 and 3 to afford 2 and 4, respectively, reveals that in the case of icetexone, all six SCS values of the quinone ring are in excellent agreement with the expected values, while in the case of conacytone, three agree and three do not agree due to the presence of additional acetates near the quinone ring. Density functional theory calculations performed on 3-hydroxythymoquinone (6) and its tautomer 4-hydroxy-1,2-quinone 7, on 6-hydroxythymoquinone (8) and its tautomer ortho-quinone 9, and on icetexone (1) and the claimed natural occurring ortho-quinone tautomer romulogarzone (5) indicate that 2-hydroxy-1,4-quinones are more stable, by some 11-14 kcal/mol, than their 4-hydroxy-1,2-quinone tautomers, and therefore, romulogarzone (5) is inexistent.
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Affiliation(s)
- Baldomero Esquivel
- Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, Mexico
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Celia Bustos-Brito
- Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, Mexico
| | - Nury Pérez-Hernández
- Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Leovigildo Quijano
- Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, 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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Julio LF, Burgueño-Tapia E, Díaz CE, Pérez-Hernández N, González-Coloma A, Joseph-Nathan P. Absolute configuration of the ocimene monoterpenoids from Artemisia absinthium. Chirality 2017; 29:716-725. [PMID: 28840973 DOI: 10.1002/chir.22741] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 07/06/2017] [Accepted: 07/09/2017] [Indexed: 12/13/2022]
Abstract
The absolute configuration (AC) of the naturally occurring ocimenes (-)-(3S,5Z)-2,6-dimethyl-2,3-epoxyocta-5,7-diene (1) and (-)-(3S,5Z)-2,6-dimethylocta-5,7-dien-2,3-diol (2), isolated from the essential oils of domesticated specimens of Artemisia absinthium, followed by vibrational circular dichroism (VCD) studies of 1, as well as from the acetonide 3 and the monoacetate 4, both derived from 2, since secondary alcohols are not the best functional groups to be present during VCD studies in solution due to intermolecular associations. The AC follows from comparison of experimental and calculated VCD spectra that were obtained by Density Functional Theory computation at the B3LYP/DGDZVP level of theory. Careful nuclear magnetic resonance (NMR) measurements were compared with literature values, providing for the first time systematic 1 H and 13 C chemical shift data. Regarding homonuclear 1 H coupling constants, after performing a few irradiation experiments that showed the presence of several small long-range interactions, the complete set of coupling constants for 3, which is representative of the four studied molecules, was determined by iterations using the PERCH software. This procedure even allowed assigning the pro-R and pro-S methyl group signals of the two gem-dimethyl groups present in 3.
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Affiliation(s)
- Luis F Julio
- Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Carmen E Díaz
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, La Laguna, Tenerife, Spain
| | - Nury Pérez-Hernández
- Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Azucena González-Coloma
- Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
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Burgueño-Tapia E, Joseph-Nathan P. Vibrational Circular Dichroism: Recent Advances for the Assignment of the Absolute Configuration of Natural Products. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013–2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F., 11340 Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14–740, México D.F., 07000 Mexico
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Burgueño-Tapia E, Joseph-Nathan P. Vibrational Circular Dichroism: Recent Advances for the Assignment of the Absolute Configuration of Natural Products. Nat Prod Commun 2017; 12:641-651. [PMID: 30496660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023] Open
Abstract
Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013-2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Burgueño-Tapia E, Sánchez-Castellanos M, Joseph-Nathan P. Optimization of the Number of Considered Conformers for the Absolute Configuration Determination of Catechin and Epicatechin Peracetates by VCD. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Epimeric catechin and epicatechin peracetates offer the possibility to explore the number of conformers needed for the absolute configuration determination without affecting the reliability of the assignment. Comparisons between experimental and DFT B3PW91/DGDZVP calculated curves showed that, in molecules where the conformational flexibility generates a large number of conformers, it is possible to significantly reduce the number of conformers needed to generate VCD results that provide secure absolute configuration assignment.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, Mexico City, 11340 Mexico
| | - Mariano Sánchez-Castellanos
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Mexico City, 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
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Burgueño-Tapia E, Joseph-Nathan P. Optimization of the Number of Considered Conformers for the Absolute Configuration Determination of Catechin and Epicatechin Peracetates by VCD. Nat Prod Commun 2017; 12:683-686. [PMID: 30496675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023] Open
Abstract
Epimeric catechin and epicatechin peracetates offer the possibility to explore the number of conformers needed for the absolute configuration determination without affecting the reliability of the assignment. Comparisons between experimental and DFT B3PW91/DGDZVP calculated curves showed that, in molecules.where the conformational flexibility generates a large number of conformers, it is possible to significantly reduce the number of conformers needed to generate VCD results that provide secure absolute configuration assignment.
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Burgueño-Tapia E, Chávez-Castellanos K, Cedillo-Portugal E, Joseph-Nathan P. Absolute configuration of diterpenoids from Jatropha dioica by vibrational circular dichroism. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2016.11.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Domínguez-Mendoza EA, Cornejo-Garrido J, Burgueño-Tapia E, Ordaz-Pichardo C. Antidiabetic effect, antioxidant activity, and toxicity of 3′,4′-Di-O-acetyl-cis-khellactone in Streptozotocin-induced diabetic rats. Bioorg Med Chem Lett 2016; 26:4086-91. [DOI: 10.1016/j.bmcl.2016.06.071] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 06/24/2016] [Indexed: 12/30/2022]
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Burgueño-Tapia E, Joseph-Nathan P. Vibrational Circular Dichroism: Recent Advances for the Assignment of the Absolute Configuration of Natural Products. Nat Prod Commun 2015; 10:1785-1795. [PMID: 26669125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Abstract
Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013-2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Burgueño-Tapia E, Joseph-Nathan P. Vibrational Circular Dichroism: Recent Advances for the Assignment of the Absolute Configuration of Natural Products. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501001036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013-2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Quimica Orgdnica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico National, Prolongatión de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F., 11340 Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigatión y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México D.F., 07000 Mexico
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Buendía-Trujillo AI, Torrres-Valencia JM, Joseph-Nathan P, Burgueño-Tapia E. Absolute Configuration Assignment of 3′,4′-di-O-acylkhellactones Using Vibrational Circular Dichroism Exciton Chirality. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501000658] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The 3′R,4 ‘R absolute configuration (AC) of the angular-type pyranocoumarins (-)-3′,4′-di- O-acetylkhellactone (2), (-)-4′- O-acetyl-3′- O-angeloylkhellactone (3), (+)-3′- O-acetyl-4- O-isobutyroylkhellactone (4), and (-)-3′- O-angeloyl-4′- O-senecioylkhellactone (5), isolated from the aerial parts of Prionosciadum thapsoides, was assigned by vibrational circular dichroism exciton chirality (VCDEC), and confirmed by comparison of their VCD frequencies with those calculated using DFT at the B3LYP/DGDZVP level. This again reveals that AC assignments based on optical rotation data are not very confident. Evaluation of Flack and Hooft parameters obtained after single-crystal X-ray diffraction analysis of 3, independently confirmed this AC.
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Affiliation(s)
- Abigail I. Buendía-Trujillo
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F. 11340, Mexico
| | - J. Martín Torrres-Valencia
- Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, km 4.5 Carretera Pachuca-Tulancingo, Mineral de la Reforma, Hidalgo 42184, Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14–740, México, D.F. 07000, Mexico
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F. 11340, Mexico
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Buendía-Trujillo AI, Torrres-Valencia JM, Joseph-Nathan P, Burgueño-Tapia E. The absolute configuration of angular 3′-acyloxypyranocoumarins by vibrational circular dichroism exciton chirality. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Burgueño-Tapia E, González-Coloma A, Martín-Benito D, Joseph-Nathan P. Antifeedant and Phytotoxic Activity of Cacalolides and Eremophilanolides. ACTA ACUST UNITED AC 2014; 62:362-6. [PMID: 17708441 DOI: 10.1515/znc-2007-5-608] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The antifeedant effect of six cacalolides and six eremophilanolides was tested against the herbivorous insects Spodoptera littoralis, Leptinotarsa decemlineata, and Myzus persicae. The test compounds included several natural products isolated from Senecio madagascariensis (14-isovaleryloxy-1,2-dehydrocacalol methyl ether, 4), S. barba-johannis (13-hydroxy-14-oxocacalohastine, 5; 13-acetyloxy-14-oxocacalohastine, 6) and S. toluccanus [6-hydroxyeuryopsin, 7; 1(10)-epoxy-6-hydroxyeuryopsin, 9; toluccanolide A, 11] and the derivatives cacalol methyl ether (1); cacalol acetate (2); 1-acetyloxy-2-methyloxy-1,2,3,4-tetradehydrocacalol acetate (3); 6-acetyloxyeuryopsin (8); 6-acetyloxy-1(10)-epoxyeuryopsin (10), and toluccanolide A acetate (12). Compound 11 and its derivative 12 exhibited moderate antifeedant activity against S. littoralis; 2, 7D10, and 12 showed strong activity against L. decemlineata, while the aphid M. persicae was moderately deterred in the presence of compounds 1, 4, 8, 10, and 12. The phytotoxic activity of 1D12 on Lactuca sativa was also evaluated. Compounds 2 and 4D 12 moderately inhibited seed germination at 24 h, while compounds 1D4, 6, 9, and 10 had a significant inhibition effect on L. sativa radicle length (over 50%).
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México DF, 11340 Mexico
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Villanueva-Cañongo C, Pérez-Hernández N, Hernández-Carlos B, Cedillo-Portugal E, Joseph-Nathan P, Burgueño-Tapia E. Complete 1H NMR assignments of pyrrolizidine alkaloids and a new eudesmanoid from Senecio polypodioides. Magn Reson Chem 2014; 52:251-257. [PMID: 24574143 DOI: 10.1002/mrc.4054] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 01/28/2014] [Accepted: 02/01/2014] [Indexed: 06/03/2023]
Abstract
Chemical investigation of the aerial parts of Senecio polypodioides lead to the isolation of the new eudesmanoid 1β-angeloyloxyeudesm-7-ene-4β,9α-diol (1) and the known dirhamnosyl flavonoid lespidin (3), while from roots, the known 7β-angeloyloxy-1-methylene-8α-pyrrolizidine (5) and sarracine N-oxide (6), as well as the new neosarracine N-oxide (8), were obtained. The structure of 1 and 8 was elucidated by spectral means. Complete assignments of the (1)H NMR data for 5, 6, sarracine (7), and 8 were made using one-dimensional and two-dimensional NMR experiments and by application of the iterative full spin analysis of the PERCH NMR software.
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Affiliation(s)
- Claudia Villanueva-Cañongo
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México, 11340, Mexico
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García-Galicia MC, Burgueño-Tapia E, Romero-Rojas A, García-Zebadúa JC, Cornejo-Garrido J, Ordaz-Pichardo C. Anti-hyperglycemic effect, inhibition of inflammatory cytokines expression, and histopathology profile in streptozotocin-induced diabetic rats treated with Arracacia tolucensis aerial-parts extracts. J Ethnopharmacol 2014; 152:91-98. [PMID: 24373809 DOI: 10.1016/j.jep.2013.12.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 11/28/2013] [Accepted: 12/18/2013] [Indexed: 06/03/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Arracacia tolucensis is a medicinal plant used in northeast of Mexico as a remedy to treat people with Diabetes mellitus (DM); however, there are no scientific studies that support this information. Thus, we evaluated the anti-hyperglycemic effect of the hexane, ethyl acetate and ethanol extracts from aerial parts in streptozotocin-induced diabetic rats. MATERIALS AND METHODS DM was induced in Wistar male rats by single intraperitoneal injection of streptozotocin (STZ 50mg/kg). After STZ-induction, hyperglycemic rats were treated with all three extracts orally at a single dose (250 mg/kg) each 48 h for 21 days. Glibenclamide (1mg/kg) was used as a reference drug. The fasting blood glucose levels, the hematic biometry and biochemical profiles, and the inhibition of inflammatory cytokines expression were estimated. Histopathology analysis of pancreas, liver, spleen, and kidney tissue was carried out. RESULTS Ours results showed that ethyl acetate extract decreased blood glucose levels significantly (75%, p< 0.05) when compared to diabetic rats and controlled the body weight loss; the lipids level did not change, but the enzyme levels of aspartate aminotransferase and alanine aminotransferase decreased significantly (60.83% and 66.16%, respectively, p< 0.05) and inhibited the expression of inflammatory cytokines,with respect to diabetic rats. Histopathology injury was not observed; by contrast repair of islet of Langerhans was exhibited. CONCLUSION These results validate the use of Arracacia tolucensis as a treatment against DM and suggests it is suitable to continue studies for its safe therapeutic use.
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Affiliation(s)
- Mary Carmen García-Galicia
- Laboratorio de Biología Celular y Productos Naturales, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Guillermo Massieu Helguera 239, Col. La Escalera, C.P. 07320 México, D.F., México
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Col. Santo Tomás, C.P. 11340 México, D.F., México
| | - Andrés Romero-Rojas
- Centro Universitario de Diagnóstico y Laboratorio de Inmunología de la Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Av. 1° de Mayo s/n, Col. Santa María Las Torres, C.P. 54740 Cuautitlán, Estado de México, México
| | - Julio César García-Zebadúa
- Laboratorio de Biología Celular y Productos Naturales, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Guillermo Massieu Helguera 239, Col. La Escalera, C.P. 07320 México, D.F., México
| | - Jorge Cornejo-Garrido
- Laboratorio de Biología Celular y Productos Naturales, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Guillermo Massieu Helguera 239, Col. La Escalera, C.P. 07320 México, D.F., México
| | - Cynthia Ordaz-Pichardo
- Laboratorio de Biología Celular y Productos Naturales, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Guillermo Massieu Helguera 239, Col. La Escalera, C.P. 07320 México, D.F., México.
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Zepeda LG, Burgueño-Tapia E, Pérez-Hernández N, Cuevas G, Joseph-Nathan P. NMR-based conformational analysis of perezone and analogues. Magn Reson Chem 2013; 51:245-250. [PMID: 23436543 DOI: 10.1002/mrc.3940] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 01/16/2013] [Accepted: 01/17/2013] [Indexed: 06/01/2023]
Abstract
Complete assignment of the (1)H NMR chemical shift and coupling constant values of perezone (1), O-methylperezone (2) and 6-hydroxyperezone (3) was carried out by total-line-shape-fitting calculations using the PERCH iterative spectra analysis software (PERCH Solutions Ltd., Kuopio, Finland). The resulting simulated spectra for the three compounds showed strong similarity to their corresponding experimental spectra. Particularly, all vicinal, allylic and homoallylic coupling constant values for the side chain of the three compounds were very similar, thus revealing that the conformation of these three molecules in solution is indeed almost identical. This fact is in agreement with extended side chain conformations over folded chain conformations because 1, 2 and 3 undergo completely different intramolecular cycloaddition reactions. In addition, results of double pulsed field gradient spin echo NOESY 1D experiments performed on perezone (1) were unable to provide evidence for folded conformers.
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Affiliation(s)
- L Gerardo Zepeda
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México, D.F., 11340, Mexico
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Burgueño-Tapia E, Cerda-García-Rojas CM, Joseph-Nathan P. Conformational analysis of perezone and dihydroperezone using vibrational circular dichroism. Phytochemistry 2012; 74:190-195. [PMID: 22177478 DOI: 10.1016/j.phytochem.2011.10.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 08/04/2011] [Accepted: 10/10/2011] [Indexed: 05/31/2023]
Abstract
The vibrational circular dichroism (VCD) spectra of perezone and dihydroperezone measured from CDCl(3) solutions were quite similar, suggesting analogous conformations for both molecules. Their absolute configurations were confirmed by comparison of the experimental VCD spectrum of each compound with curves generated from theoretical calculations using density functional theory (DFT) at the B3LYP/DGDZVP level of theory taking into account their conformational mobility. Conformational analysis of the 8-(R) enantiomer showed 19 low energy conformers in a 2.4 kcal/mol energy range, while for 8-(R), with the saturated side alkyl chain, 34 conformers were considered in the first 2 kcal/mol. Initial analyses were carried out using a Monte Carlo searching with the MMFF94 molecular mechanics force field, all MMFF94 conformers were geometrically optimized using DFT at the B3LYP/6-31G(d) level of theory, followed by reoptimization and calculations of their vibrational frequencies at the B3LYP/DGDZVP level. Good agreement between the theoretical 8-(R) enantiomers and experimental VCD curves were observed for both.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México DF 11340, Mexico
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Abstract
Three new benzodihydrofurans (1-3) and seven known aromatic compounds (4-10) were isolated from the roots of Cyperus teneriffae. Vibrational circular dichroism spectroscopy was used to define the absolute configuration of 1.
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Affiliation(s)
- Ángel Amesty
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna , Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
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Morales-Ríos MS, López-Camacho PY, Jacobo-Cabral CO, Pérez-Rojas NA, Trujillo-Serrato JJ, Burgueño-Tapia E, Suárez-Castillo OR, Joseph-Nathan P. Unimolecular rearrangements of ketene-O,O-acetals and fragmentations occurring in the gas phase. J Mass Spectrom 2011; 46:489-495. [PMID: 21500318 DOI: 10.1002/jms.1915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Gas phase skeletal rearrangements of regioisomeric 3-cyano-2-methoxy-3a-alkylfuro[2,3-b]- and [3,2-b]indoles were evidenced by product ions [M-32](+•), consistent with loss of methanol, on electron ionization in their mass spectra. The rearranged products occurring in gas phase were demonstrated to have elemental composition and fragmentation properties identical to those of authentic samples of 2-indolyl cyanomalonates. Isotopic labeling experiments support the formation mechanism of the [M-32](+•) ion. Additional thermal gas-phase reaction products were characterized by comparison with an authentic sample.
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Affiliation(s)
- Martha S Morales-Ríos
- Departamento de Química Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México, D. F., 07000 Mexico.
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Zepeda LG, Burgueño-Tapia E, Joseph-Nathan P. Myrtenal, a Controversial Molecule for the Proper Application of the CIP Sequence Rule for Multiple Bonds. Nat Prod Commun 2011. [DOI: 10.1177/1934578x1100600401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This communication highlights the need of building hierarchical digraphs for the unequivocal assignment of stereochemical descriptors of (-)-myrtenal, a naturally-occurring oxygenated monoterpene whose absolute configuration (AC) is sometimes misrepresented in its structural formulae. Differentiation between duplicated atoms and phantom atoms for the proper application of the sequence rules is shown to be an essential step to get a proper construction of hierarchical digraphs.
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Affiliation(s)
- L. Gerardo Zepeda
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Carpio y Plan de Ayala, Col. Santo Tomás, México, D. F., 11340 México
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Carpio y Plan de Ayala, Col. Santo Tomás, México, D. F., 11340 México
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México, D. F., 07000 México
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Zepeda LG, Burgueño-Tapia E, Joseph-Nathan P. Myrtenal, a controversial molecule for the proper application of the CIP Sequence Rule for multiple bonds. Nat Prod Commun 2011; 6:429-432. [PMID: 21560753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023] Open
Abstract
This communication highlights the need of building hierarchical digraphs for the unequivocal assignment of stereochemical descriptors of (-)-myrtenal, a naturally-occurring oxygenated monoterpene whose absolute configuration (AC) is sometimes misrepresented in its structural formulae. Differentiation between duplicated atoms and phantom atoms for the proper application of the sequence rules is shown to be an essential step to get a proper construction of hierarchical digraphs.
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Affiliation(s)
- L Gerardo Zepeda
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Carpio y Plan de Ayala, Col. Santo Tomás, México, D. F., 11340 México
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Tamariz J, Quiroz-Florentino H, Hernández-Benitez R, Aviña J, Burgueño-Tapia E. Total Synthesis of Naturally Occurring Furan Compounds 5-{[(4-Hydroxybenzyl)oxy]methyl}-2-furaldehyde and Pichiafuran C. SYNTHESIS-STUTTGART 2011. [DOI: 10.1055/s-0030-1258455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Burgueño-Tapia E, Zepeda LG, Joseph-Nathan P. Absolute configuration of (-)-myrtenal by vibrational circular dichroism. Phytochemistry 2010; 71:1158-1161. [PMID: 20457457 DOI: 10.1016/j.phytochem.2010.04.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2010] [Revised: 03/09/2010] [Accepted: 04/07/2010] [Indexed: 05/29/2023]
Abstract
The VCD spectrum of the monoterpene (-)-myrtenal (1) was compared with theoretical spectra using ab initio density functional theory (DFT) calculations at the B3LYP/6-31G(d,p), B3LYP/6-31G+(d,p), B3LYP/6-311G+(d,p), B3LYP/DGDZVP, and B3PW91/DGTZVP levels of theory. Conformational analysis of 1 indicated that the lowest energy conformer was s-trans-C2-C10, which contributes more than 98.5% to the total conformational population regardless of the employed level of theory. The use of a recently developed confidence level algorithm demonstrated that VCD spectra calculated for the main conformer, using the indicated hybrid functionals and basis set, gave no significant changes, from where it follows that B3LYP/DGDZVP calculations provide a superior balance between computer cost and VCD spectral accuracy. The DGDZVP basis set demanded around a quarter the time than the 6-311G+(d,p) basis set while providing similar results. The spectral comparison also provided evidence that the levorotatory enantiomer of myrtenal has the 1R absolute configuration.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México, D.F. 11340, Mexico
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Reina M, Burgueño-Tapia E, Bucio MA, Joseph-Nathan P. Absolute configuration of tropane alkaloids from Schizanthus species by vibrational circular dichroism. Phytochemistry 2010; 71:810-815. [PMID: 20189614 DOI: 10.1016/j.phytochem.2010.02.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Revised: 02/01/2010] [Accepted: 02/03/2010] [Indexed: 05/28/2023]
Abstract
The absolute configuration (AC) of 6beta-hydroxy-3alpha-senecioyloxytropane (1), 3alpha-hydroxy-6beta-tigloyloxytropane (2), 3alpha-hydroxy-6beta-senecioyloxytropane (3), and 3alpha-hydroxy-6beta-angeloyloxytropane (4) was assigned as (1R,3R,5S,6R) using density functional theory (DFT) calculations at the B3LYP/DGDZVP level of theory in combination with experimental vibrational circular dichroism (VCD) measurements and comparison with the spectra of similar tropanes. The AC of 1 followed from a sample isolated from Schizanthus grahamii, while those of the mixture of 2 and 3, isolated from the same source, were determined by comparing the VCD measurement to a weighted calculation of the individual VCD spectra according to a 69:31 ratio of 2:3 determined by (1)H NMR signal integration. In turn, Schizanthus pinnatus provided a 7:3 mixture of 1:4 whose AC was determined using the experimental VCD absorptions in the 1150-950 cm(-1) spectral region which were compared with those observed for 1-3 and with those described for other 3alpha,6beta-tropanediol derivatives.
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Affiliation(s)
- Matías Reina
- Instituto de Productos Naturales y Agrobiología (IPNA), CSIC, La Laguna, Tenerife, Spain
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Cerda-García-Rojas CM, Burgueño-Tapia E, Román-Marín LU, Hernández-Hernández JD, Agulló-Ortuño T, González-Coloma A, Joseph-Nathan P. Antifeedant and cytotoxic activity of longipinane derivatives. Planta Med 2010; 76:297-302. [PMID: 19742424 DOI: 10.1055/s-0029-1186080] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The polyoxygenated longipinane derivatives 1- 8 were tested as antifeedant compounds against the herbivorous insects Spodoptera littoralis, Rhopalosiphum padi, and Myzus persicae. Compounds 1-3 and 8 exhibited significant antifeedant activity against S. littoralis and M. persicae. The antifeedant activity against S. littoralis increased moderately after the C-8 hydroxy group in 3 was removed to afford 1 and increased strongly after the remaining two hydroxy groups were acetylated to afford 2. Compound 1 was active on M. persicae. Compounds 1, 3, and 4, with an unsaturated six-membered ring, exhibited an increase in post-ingestive effects on S. littoralis ranging from antifeedant in the case of 1 to toxic for compounds 3 and 4. These compounds did not have any phytotoxic effect on Lactuca sativa. When tested on a panel of tumoral cells, compounds 2 and 6 exhibited moderate selective cytotoxic effects on the p53 null lung carcinoma cells H1299, which were not affected by the drug paclitaxel. In addition, vibrational circular dichroism (VCD) was applied to the representative longipinene derivative 2 to verify its absolute configuration, and the sensitivity of the VCD methodology was evaluated by comparing spectra of the three diastereoisomers (4 R,5 S,7 R,9 R,10 R,11 R)-7,9-diacetyloxylongipin-2-en-1-one (2), (4 R,5 S,7 S,9 R,10 R,11 R)-7,9-diacetyloxylongipin-2-en-1-one, and (4 R,5 S,7 R,9 S,10 R,11 R)-7,9-diacetyloxylongipin-2-en-1-one.
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Affiliation(s)
- Carlos M Cerda-García-Rojas
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, México DF, Mexico
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Loandos MDH, Villecco MB, Burgueño-Tapia E, Joseph-Nathan P, Catalán CAN. Preparation and absolute configuration of (1R,4R)-(+)-3-oxo-, (1S,4S)-(-)-3-oxo- and (1R,3S,4R)-(+)-3-acetyloxy-5-oxo-1 ,8-cineole. Nat Prod Commun 2009; 4:1537-1545. [PMID: 19967986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
Enantiomerically pure (1S,4S)-(-)-3-oxo-1,8-cineole (-)-2 and (1R,4R)-(+)-3-oxo-1,8-cineole (+)-2 were prepared for the first time and their absolute configurations assigned by vibrational circular dichroism (VCD) measurements. Thus, treatment of cineole 1 with chromyl acetate gave rac-2 which after sodium borohydride reduction and acetylation provided racemic 3-endo-acetyloxy-1,8-cineole, rac-4. Enantioselective hydrolysis using porcine liver esterase (PLE) gave a mixture of 3-endo-hydroxy-1,8-cineole (-)-3 and 3-endo-acetyloxy-1,8-cineole (+)-4. After chromatographic separation, (-)-3 was oxidized to (+)-2, while (+)-4 was hydrolysed to (+)-3 and then oxidized to (-)-2. The absolute configuration of either ketone 2 was established by VCD spectroscopy in combination with density functional theory (DFT) calculations at the B3LYP/DGDZVP level of theory, from where it followed that the (+)-2 enantiomer corresponds to (1R,4R)-1,3,3-trimethyl-5-oxo-2-oxabicyclo[2.2.2]octane and the (-)-2 enantiomer to the (1S,4S) molecule which is also in agreement with the absolute configuration deduced by the Mosher method for the starting chiral alcohols. Some literature inconsistencies are clarified. In addition, the enantiomerically pure monoester (1S,3S,4R,5R)-(-)-3-acetyloxy-5-hydroxy-1,8-cineole 6 and the ketoester (1R,3S,4R)-(+)-3-acetyloxy-5-oxo-1,8-cineole 7 were prepared from meso-diacetate 5 by enantioselective asymmetrization also using PLE.
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Affiliation(s)
- María del H Loandos
- lNQUINOA-CONICET and Instituto de Química Orgánica, Facultad de Bioquimica Quimica y Farmacia, Universidad Nacional de Tucuman, Ayacucho 471, S. M de Tucumin, T4000INI, Argentina
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Loandos MDH, Villecco MB, Burgueño-Tapia E, Joseph-Nathan P, Catalán CAN. Preparation and Absolute Configuration of (1R,4R)-(+)-3-Oxo-, (1S,4S)-(-)-3-Oxo- and (1R,3S,4R)-(+)-3-Acetyloxy-5-oxo-1,8-cineole. Nat Prod Commun 2009. [DOI: 10.1177/1934578x0900401116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Enantiomerically pure (1S,4S)-(-)-3-oxo-1,8-cineole (-)-2 and (1R,4R)-(+)-3-oxo-1,8-cineole (+)-2 were prepared for the first time and their absolute configurations assigned by vibrational circular dichroism (VCD) measurements. Thus, treatment of cineole 1 with chromyl acetate gave rac-2 which after sodium borohydride reduction and acetylation provided racemic 3-endo-acetyloxy-1,8-cineole, rac-4. Enantioselective hydrolysis using porcine liver esterase (PLE) gave a mixture of 3-endo-hydroxy-1,8-cineole (-)-3 and 3-endo-acetyloxy-1,8-cineole (+)-4. After chromatographic separation, (-)-3 was oxidized to (+)-2, while (+)-4 was hydrolysed to (+)-3 and then oxidized to (-)-2. The absolute configuration of either ketone 2 was established by VCD spectroscopy in combination with density functional theory (DFT) calculations at the B3LYP/DGDZVP level of theory, from where it followed that the (+)-2 enantiomer corresponds to (1R,4R)-1,3,3-trimethyl-5-oxo-2-oxabicyclo[2.2.2]octane and the (-)-2 enantiomer to the (1S,4S) molecule which is also in agreement with the absolute configuration deduced by the Mosher method for the starting chiral alcohols. Some literature inconsistencies are clarified. In addition, the enantiomerically pure monoester (1S,3S,4R,5R)-(-)-3-acetyloxy-5-hydroxy-1,8-cineole 6 and the ketoester (1R,3S,4R)-(+)-3-acetyloxy-5-oxo-1,8-cineole 7 were prepared from meso-diacetate 5 by enantioselective asymmetrization also using PLE.
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Affiliation(s)
- María del H. Loandos
- INQUINOA-CONICET and Instituto de Química Orgánica, Facultad de Bioquímica Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, S. M. de Tucumán, T4000INI Argentina
| | - Margarita B. Villecco
- INQUINOA-CONICET and Instituto de Química Orgánica, Facultad de Bioquímica Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, S. M. de Tucumán, T4000INI Argentina
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México, D.F., 11340 México
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México, D.F., 07000 México
| | - César A. N. Catalán
- INQUINOA-CONICET and Instituto de Química Orgánica, Facultad de Bioquímica Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, S. M. de Tucumán, T4000INI Argentina
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Quiroz-Florentino H, García A, Burgueño-Tapia E, Tamariz J. Total synthesis of the natural succinate derivative of 5-(hydroxymethyl)furfural isolated from the Noni fruit (Morinda citrifolia). Nat Prod Res 2009; 23:1355-62. [DOI: 10.1080/14786410903040477] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Rojas-Pérez RE, Cedillo-Portugal E, Joseph-Nathan P, Burgueño-Tapia E. A new longipinene diester from Stevia monardifolia Kunth. Nat Prod Commun 2009; 4:757-762. [PMID: 19634316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
Nonpolar and medium polarity fractions from whole plant methanolic extracts of Stevia monardifolia afforded the new 7beta-angeloyloxy-8alpha-isovaleroyloxylongipin-2-en-1-one 1 along with known 7beta,8alpha-diangeloyloxylongipin-2-en-1-one 2 and 7beta,8alpha-diangeloyloxylongipinan-1-one 3. Alkaline hydrolysis of a mixture of 1 and 2 gave 7beta,8alpha-dihydroxylongipin-2-en-lone 4 which was subjected to a single crystal X-ray diffraction study. The new compound 1, which is the third 7beta,8alpha-dihydroxylongipin-2-en-1-one diester natural product isolated from a Stevia especies, was fully characterized by one- and two-dimensional NMR spectroscopy and its absolute configuration was confirmed as the 4R,5S,7S,8S,10R,11R enantiomer by vibrational circular dichroism (VCD) measurements in comparison to calculation at the B3LYP/DGDZVP level of theory.
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Affiliation(s)
- Rodrigo E Rojas-Pérez
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Bioldgicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomas, DF México, 11340 Mexico
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Abstract
Nonpolar and medium polarity fractions from whole plant methanolic extracts of Stevia monardifolia afforded the new 7β-angeloyloxy-8α-isovaleroyloxylongipin-2-en-1-one 1 along with known 7β,8α-diangeloyloxylongipin-2-en-1-one 2 and 7β,8α-diangeloyloxylongipinan-1-one 3. Alkaline hydrolysis of a mixture of 1 and 2 gave 7β,8α-dihydroxylongipin-2-en-1-one 4 which was subjected to a single crystal X-ray diffraction study. The new compound 1, which is the third 7β,8α-dihydroxylongipin-2-en-1-one diester natural product isolated from a Stevia especies, was fully characterized by one-and two-dimensional NMR spectroscopy and its absolute configuration was confirmed as the 4R,5S,7S,8S,10R,11 R enantiomer by vibrational circular dichroism (VCD) measurements in comparison to calculation at the B3LYP/DGDZVP level of theory.
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Affiliation(s)
- Rodrigo E. Rojas-Pérez
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México, D.F., 11340 Mexico
| | | | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México, D.F., 07000 México
| | - Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México, D.F., 11340 Mexico
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Torres-Valencia JM, Chávez-Ríos OE, Cerda-García-Rojas CM, Burgueño-Tapia E, Joseph-Nathan P. Dihydrofurochromones from Prionosciadium thapsoides. J Nat Prod 2008; 71:1956-1960. [PMID: 18954117 DOI: 10.1021/np800387w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Chemical investigations of Prionosciadium thapsoides roots led to the isolation of the new dihydrofurochromones (S)-(+)-4'-O-angeloyl-5-O-methylvisamminol (1) and (S)-(+)-4'-O-senecioyl-5-O-methylvisamminol (2), together with the known coumarins jatamansin, buchtormin, isopteryxin, isosamidin, psoralen, and bergapten. The structures of 1 and 2 were determined by 1D and 2D NMR experiments, and their absolute configuration was established by chemical correlation with (+)-5-O-methylvisamminol (3), whose structure was secured by single-crystal X-ray diffraction analysis and its absolute configuration was established as S by vibrational circular dichroism spectroscopy in comparison to DFT B3LYP/DGDZVP calculations.
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Affiliation(s)
- J Martín Torres-Valencia
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, km. 4.5 Carretera Pachuca-Tulancingo, Ciudad Universitaria, Pachuca, Hidalgo, 42076 Mexico.
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Burgueño-Tapia E, Joseph-Nathan P. Absolute configuration of eremophilanoids by vibrational circular dichroism. Phytochemistry 2008; 69:2251-2256. [PMID: 18599095 DOI: 10.1016/j.phytochem.2008.05.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2007] [Revised: 04/09/2008] [Accepted: 05/21/2008] [Indexed: 05/26/2023]
Abstract
The absolute configurations (AC) of natural occurring 6-hydroxyeuryopsin (1), of its acetyl derivative 2, and of eremophilanolide 8 were confirmed by comparison of the experimental vibrational circular dichroism (VCD) spectra with theoretical curves generated from density functional theory (DFT) calculations. Initial analyses were carried out using a Monte Carlo searching with the MMFF94 molecular mechanics force field. All MMFF94 conformers were further optimized using DFT at the B3LYP/6-31G(d) level of theory, followed by calculations of their vibrational frequencies at the B3LYP/6-31G(d,p); the VCD spectra of 2 and 8 were also calculated at the B3PW91/DGDZVP level of theory. Good agreement between theoretical and experimental VCD curves unambiguously verified the 4S,5R,6S absolute configuration for 1 and 2, and the 1S,4S,5R,6S,8S,10S configuration for 8.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F., 11340 Mexico
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Burgueño-Tapia E, Castillo L, González-Coloma A, Joseph-Nathan P. Antifeedant and phytotoxic activity of the sesquiterpene p-benzoquinone perezone and some of its derivatives. J Chem Ecol 2008; 34:766-71. [PMID: 18528728 DOI: 10.1007/s10886-008-9495-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 04/15/2008] [Accepted: 05/06/2008] [Indexed: 10/22/2022]
Abstract
The sesquiterpene p-benzoquinone perezone (1), isolated from Perezia adnata var. alamani (Asteraceae), and its non-natural derivatives isoperezone (2), dihydroperezone (3), dihydroisoperezone (4), and anilidoperezone (5) were tested as antifeedants against the herbivorous insects Spodoptera littoralis, Leptinotarsa decemlineata, and Myzus persicae. Compounds 1-5 exhibited strong antifeedant activity against L. decemlineata and M. persicae, and elicited a low response by S. littoralis. Antifeedant activity on L. decemlineata and M. persicae increased when the hydroxyl group at C-3 in perezone (1) was changed to C-6 to give isoperezone (2). The same effect was found with hydrogenation of the double bond of the alkyl chain of (1) to yield dihydroperezone (3). In contrast, hydrogenation of this double bond in isoperezone (2) to give dihydroisoperezone (4) led to a reduction in antifeedant activity. Determination of the phytotoxic activity of 1-5 revealed that 3 had a significant inhibition effect on Lactuca sativa radicle length growth.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, México, D.F., 11340, México
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Burgueño-Tapia E, González-Coloma A, Castillo L, Joseph-Nathan P. Antifeedant and phytotoxic activity of hydroxyperezone and related molecules. Z NATURFORSCH C 2008; 63:221-225. [PMID: 18533466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The insect antifeedant and toxic activity of hydroxyperezone (1), its derivatives 2-9, along with 3-hydroxy- (10) and 6-hydroxythymoquinone (11) were studied against Spodoptera littoralis, Leptinotarsa decemlineata, and Myzus persicae. The antifeedant tests showed that L. decemlineata was the most sensitive insect, followed by M. persicae, while S. littoralis was not deterred by compounds 1-11. Leucohydroxyperezone tetraacetate (3), oxoperezinone (6), dihydroleucoperezinone diacetate (7), 3-hydroxy- (10) and 6-hydroxythymoquinone (11) showed strong activity against L. decemlineata. 1 and 7 exhibited moderate deterrent activity against M. persicae, while 1 and dihydroleucohydroxyperezone tetraacetate (4) acted as post-ingestive antifeedants to S. littoralis. The phytotoxic activity of compounds 1-11 was also evaluated. Hydroxyperezone (1) strongly inhibited seed germination at 24 h, while the activity of 3-8 and 10 was moderate. The level of radicle growth inhibition obtained with compounds 1-5 and 8-11 was significant (< 50%).
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Thomás, México D. F., 11340 Mexico
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Krautmann M, de Riscala EC, Burgueño-Tapia E, Mora-Pérez Y, Catalán CAN, Joseph-Nathan P. C-15-functionalized eudesmanolides from Mikania campanulata. J Nat Prod 2007; 70:1173-9. [PMID: 17616227 DOI: 10.1021/np070154t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The aerial parts of Mikania campanulata Gardner afforded the nine new eudesmanolides (1S,4S,5S,6S,7S,10R)-1-hydroxy-15-acetoxyeudesm-11(13)-en-6,12-olide (1), (1S,4S,5S,6S,7S,10R)-1,4-dihydroxy-15-acetoxyeudesm-11(13)-en-6,12-olide (2), (1R,4S,5S,6S,7S,10R)-1,4-dihydroxy-15-acetoxyeudesm-11(13)-en-6,12-olide (3), (1R,4S,5S,6S,7S,10R)-1-hydroxy-4,15-diacetoxyeudesm-11(13)-en-6,12-olide (4), (1S,4R,5S,6S,7S,10R)-1,15-diacetoxy-4-hydroxyeudesm-11(13)-en-6,12-olide (5), (1S,5S,6S,7S,10R)-1-hydroxy-15-acetoxyeudesma-4(15),11(13)-dien-6,12-olide (6), (1S,5S,6S,7S,10R)-1,15-dihydroxyeudesma-3,11(13)-dien-6,12-olide (7a), (1S,2R,5S,6S,7S,10R)-1,2,15-trihydroxyeudesma-3,11(13)-dien-6,12-olide (8a), and (1R,6S,7S,10R)-1,15-dihydroxyeudesma-4,11(13)-dien-6,12-olide (9a), among which the last three were characterized as their corresponding peracetates (7b-9b). The structures of 1-6 and 7b-9b were elucidated using 1D and 2D NMR measurements, while that of major constituent 1 was confirmed by single-crystal X-ray diffraction analysis, and its absolute configuration evidenced from vibrational circular dichroism measurements, which were compared to results obtained from density functional theory calculations. The chemistry of the large genus Mikania is briefly analyzed.
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Affiliation(s)
- Marta Krautmann
- Facultad de Agronomía y Zootecnia, Universidad Nacional de Tucumán, Avenida Roca 1900, S. M. de Tucumán, 4000 Argentina
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Burgueño-Tapia E, López-Escobedo S, González-Ledesma M, Joseph-Nathan P. A new eremophilanolide from Senecio sinuatus Gilib. Magn Reson Chem 2007; 45:457-62. [PMID: 17431855 DOI: 10.1002/mrc.1990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
From the hexane extracts of Senecio sinuatus roots, the new 3beta-angeloyloxy-6beta-hydroxyeremophil-1(10)-en-8beta,12-olide (3), along with the known compounds 3beta-angeloyloxy-6beta-hydroxyeremophil-1(10)-ene (1), 3beta-senecioyloxy-6beta-hydroxyeremophil-1(10)-ene (2), and 3beta-angeloyloxy-6beta,8alpha-dihydroxyeremophil-1(10)-en-8beta,12-olide (4), were isolated. Complete 1H and 13C NMR chemical shift assignments of 1-4 were achieved using one- and two-dimensional NMR techniques, including gHMQC and gHMBC experiments. A Monte Carlo search, followed by B3LYP/6-31G*DFT calculation, provided the theoretical conformations of the eremophilane rings, which were in agreement with results derived from 1H-1H NMR coupling constant analysis, and confirmed by NOESY experiments.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México D. F., 11340 México.
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Tovar-Gijón CE, Hernández-Carlos B, Burgueño-Tapia E, Cedillo-Portugal E, Joseph-Nathan P. A new C-Glycosylflavone from Encyclia michuacana. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.08.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Burgueño-Tapia E, Mora-Pérez Y, Morales-Ríos MS, Joseph-Nathan P. 1H, 13C and 15N NMR assignments of phenazopyridine derivatives. Magn Reson Chem 2005; 43:256-260. [PMID: 15625718 DOI: 10.1002/mrc.1542] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Phenazopyridine hydrochloride (1), a drug in clinical use for many decades, and some derivatives were studied by one- and two-dimensional (1)H, (13)C and (15)N NMR methodology. The assignments, combined with DFT calculations, reveal that the preferred protonation site of the drug is the pyridine ring nitrogen atom. The chemoselective acetylation of phenazopyridine (2) and its influence on the polarization of the azo nitrogen atoms were evidenced by the (15)N NMR spectra. Molecular calculations of the phenazopyridines 2-4 show that the pyridine and phenyl groups are oriented in an antiperiplanar conformation with intramolecular hydrogen bonding between the N-b atom and the C-2 amino group preserving the E-azo stereochemistry.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química, Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Av. Acueducto s/n, La Laguna Ticomán, México D.F., 07340 Mexico
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Burgueño-Tapia E, Hernández LR, Reséndiz-Villalobos AY, Joseph-Nathan P. Conformational evaluation and detailed 1H and 13C NMR assignments of eremophilanolides. Magn Reson Chem 2004; 42:887-892. [PMID: 15366063 DOI: 10.1002/mrc.1463] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Extensive application of 1D and 2D NMR methodology, combined with molecular modeling, allowed the complete 1H and 13C NMR assignments of eremophilanolides from Senecio toluccanus. Comparison of the experimental 1H, 1H coupling constant values with those generated employing a generalized Karplus-type relationship, using dihedral angles extracted from MMX and DFT calculations, revealed that the epoxidized eremophilanolides 1 and 2 show conformational rigidity at room temperature, whereas molecules 3-6, containing an isolated double bond, are conformationally mobile.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química, Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Av. Acueducto s/n, La Laguna Ticomán, México D.F., 07340 Mexico.
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