1
|
Zentar H, Jannus F, Medina-O’Donnell M, El Mansouri AE, Fernández A, Justicia J, Alvarez-Manzaneda E, Reyes-Zurita FJ, Chahboun R. Synthesis of Tricyclic Pterolobirin H Analogue: Evaluation of Anticancer and Anti-Inflammatory Activities and Molecular Docking Investigations. Molecules 2023; 28:6208. [PMID: 37687037 PMCID: PMC10489156 DOI: 10.3390/molecules28176208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/16/2023] [Accepted: 08/19/2023] [Indexed: 09/10/2023] Open
Abstract
Pterolobirin H (3), a cassane diterpene isolated from the roots of Pterolobium macropterum, exhibits important anti-inflammatory and anticancer properties. However, its relatively complex tetracyclic structure makes it difficult to obtain by chemical synthesis, thus limiting the studies of its biological activities. Therefore, we present here a short route to obtain a rational simplification of pterolobirin H (3) and some intermediates. The anti-inflammatory activity of these compounds was assayed in LPS-stimulated RAW 264.7 macrophages. All compounds showed potent inhibition of NO production, with percentages between 54 to 100% at sub-cytotoxic concentrations. The highest anti-inflammatory effect was shown for compounds 15 and 16. The simplified analog 16 revealed potential NO inhibition properties, being 2.34 higher than that of natural cassane pterolobirin H (3). On the other hand, hydroxyphenol 15 was also demonstrated to be the strongest NO inhibitor in RAW 264.7 macrophages (IC50 NO = 0.62 ± 0.21 μg/mL), with an IC50NO value 28.3 times lower than that of pterolobirin H (3). Moreover, the anticancer potential of these compounds was evaluated in three cancer cell lines: HT29 colon cancer cells, Hep-G2 hepatoma cells, and B16-F10 murine melanoma cells. Intermediate 15 was the most active against all the selected tumor cell lines. Compound 15 revealed the highest cytotoxic effect with the lowest IC50 value (IC50 = 2.45 ± 0.29 μg/mL in HT29 cells) and displayed an important apoptotic effect through an extrinsic pathway, as evidenced in the flow cytometry analysis. Furthermore, the Hoechst staining assay showed that analog 15 triggered morphological changes, including nuclear fragmentation and chromatin condensation, in treated HT29 cells. Finally, the in silico studies demonstrated that cassane analogs exhibit promising binding affinities and docking performance with iNOS and caspase 8, which confirms the obtained experimental results.
Collapse
Affiliation(s)
- Houda Zentar
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain; (H.Z.); (A.F.); (J.J.); (E.A.-M.)
- Departamento de Bioquímica y Biología Molecular I, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain; (F.J.); (M.M.-O.)
| | - Fatin Jannus
- Departamento de Bioquímica y Biología Molecular I, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain; (F.J.); (M.M.-O.)
| | - Marta Medina-O’Donnell
- Departamento de Bioquímica y Biología Molecular I, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain; (F.J.); (M.M.-O.)
| | - Az-eddine El Mansouri
- Chemistry Department, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa;
| | - Antonio Fernández
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain; (H.Z.); (A.F.); (J.J.); (E.A.-M.)
| | - José Justicia
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain; (H.Z.); (A.F.); (J.J.); (E.A.-M.)
| | - Enrique Alvarez-Manzaneda
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain; (H.Z.); (A.F.); (J.J.); (E.A.-M.)
| | - Fernando J. Reyes-Zurita
- Departamento de Bioquímica y Biología Molecular I, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain; (F.J.); (M.M.-O.)
| | - Rachid Chahboun
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain; (H.Z.); (A.F.); (J.J.); (E.A.-M.)
| |
Collapse
|
2
|
Charpentier J, Voirol F, Flachsmann F, Tanner S, Aeberli N, Brunner G, Goeke A. Synthesis of 1,4‐Cyclohexadiene Carboxylates through a Formal [2+4]‐Cycloaddition of Propiolates under Cobalt Catalysis. Helv Chim Acta 2020. [DOI: 10.1002/hlca.202000175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Julie Charpentier
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| | - Francis Voirol
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| | - Felix Flachsmann
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| | - Silvia Tanner
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| | - Natalie Aeberli
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| | - Gerhard Brunner
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| | - Andreas Goeke
- Givaudan Schweiz AG Fragrances S&T Ingredients Research Kemptpark 50 CH-8310 Kemptthal Switzerland
| |
Collapse
|
3
|
Ghosh T. Reductive Heck Reaction: An Emerging Alternative in Natural Product Synthesis. ChemistrySelect 2019. [DOI: 10.1002/slct.201804029] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Tapas Ghosh
- Department of Natural SciencesMaulana Abul Kalam Azad University of Technology Haringhata – 741249, Nadia, West Bengal India
| |
Collapse
|
4
|
Abad A, Agulló C, Cuñat AC, Navarro I, de Arellano CR. Regiospecific and Stereoselective Ene Reaction of the A-Ring Methylcyclohexene Moiety of Polycyclic Terpenoid Systems with Dimethyl Acetylenedicarboxylate. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823401103169216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Polycyclic terpenoid compounds with a methylcyclohexene moiety at the A-ring, such as 1 and 7, give a regio- and stereoselective ene reaction when heated at low temperatures with dimethyl acetylenedicarboxylate. The structure and stereochemistry of the compound formed in the case of 1, e.g. 5, is determined by X-ray analysis.
Collapse
Affiliation(s)
- Antonio Abad
- Departamento de Química Orgánica, Facultad de Químicas, Universidad de Valencia Dr. Moliner 50, E-46100 Burjassot, Valencia, Spain
| | - Consuelo Agulló
- Departamento de Química Orgánica, Facultad de Químicas, Universidad de Valencia Dr. Moliner 50, E-46100 Burjassot, Valencia, Spain
| | - Ana C. Cuñat
- Departamento de Química Orgánica, Facultad de Químicas, Universidad de Valencia Dr. Moliner 50, E-46100 Burjassot, Valencia, Spain
| | - Ismael Navarro
- Departamento de Química Orgánica, Facultad de Químicas, Universidad de Valencia Dr. Moliner 50, E-46100 Burjassot, Valencia, Spain
| | - Carmen Ramírez de Arellano
- Departamento de Química Orgánica, Facultad de Químicas, Universidad de Valencia Dr. Moliner 50, E-46100 Burjassot, Valencia, Spain
| |
Collapse
|
5
|
Zentar H, Arias F, Haidour A, Alvarez-Manzaneda R, Chahboun R, Alvarez-Manzaneda E. Protecting-Group-Free Synthesis of Cassane-Type Furan Diterpenes via a Decarboxylative Dienone–Phenol Rearrangement. Org Lett 2018; 20:7007-7010. [DOI: 10.1021/acs.orglett.8b02867] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Houda Zentar
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| | - Fabio Arias
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| | - Ali Haidour
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| | - Ramón Alvarez-Manzaneda
- Àrea de Química Orgánica, Departamento de Química y Física, Universidad de Almería, 04120 Almería, Spain
| | - Rachid Chahboun
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| | - Enrique Alvarez-Manzaneda
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| |
Collapse
|
6
|
Huang SH, Liang KH, Lu JS, Chang WS, Su MD, Yang TF. Total Synthesis of (+)-Antrocin and Its Diastereomer and Clarification of the Absolute Stereochemistry of (-)-Antrocin. J Org Chem 2017; 82:9576-9584. [PMID: 28825480 DOI: 10.1021/acs.joc.7b01600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Using 2,2-dimethyl cyclohexanone as the starting compound, (+)-antrocin and its diastereomer have been synthesized. The absolute stereochemistry of (-)-antrocin, a natural sesqui-terpenoid and an antagonist in some types of cancer cells, was clarified using the character data of (+)-antrocin. The synthetic procedure involved two key steps: (1) the reaction of vinyl magnesium bromide with 2,2-dimethyl-6-t-butyl-dimethyl-silyoxy-methyl-1-cyclo-hexanone to give a vinyl cyclohexanol derivative and (2) a highly stereoselective intramolecular Diels-Alder (IMDA) reaction of the camphanate-containing triene intermediate. The relative energy levels of the possible transition states of the IMDA reaction of the camphanate-containing triene were obtained from density functional theory calculations, proving the stereospecific formation of the target molecule.
Collapse
Affiliation(s)
- Sheng-Han Huang
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, 545 Nantou, Taiwan
| | - Kai-Hsiang Liang
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, 545 Nantou, Taiwan
| | - Jia-Syun Lu
- Department of Applied Chemistry, National Chiayi University , 60004 Chiayi, Taiwan
| | - Wei-Sheng Chang
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, 545 Nantou, Taiwan
| | - Ming-Der Su
- Department of Applied Chemistry, National Chiayi University , 60004 Chiayi, Taiwan.,Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , 80708 Kaohsiung, Taiwan
| | - Te-Fang Yang
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, 545 Nantou, Taiwan
| |
Collapse
|
7
|
|
8
|
Montenegro I, Pino L, Werner E, Madrid A, Espinoza L, Moreno L, Villena J, Cuellar M. Comparative study on the larvicidal activity of drimane sesquiterpenes and nordrimane compounds against Drosophila melanogaster til-til. Molecules 2013; 18:4192-208. [PMID: 23612472 PMCID: PMC6270097 DOI: 10.3390/molecules18044192] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2013] [Revised: 03/07/2013] [Accepted: 04/01/2013] [Indexed: 12/31/2022] Open
Abstract
Natural compounds from Drimys winteri Forst and derivatives exhibited larvicidal effects against Drosophila melanogaster til-til. The most active compound was isodrimenin (4). The highest lethal concentration to the larvae of D. melanogaster was 4.5 ± 0.8 mg/L. At very low concentrations drimenol (1), confertifolin (3), and drimanol (5) displayed antifeedant and larvae growth regulatory activity. The antifeedant results of nordrimanic and drimanic compounds were better in first instar larvae. The EC₅₀ value of polygodial (2) was 60.0 ± 4.2 mg/L; of diol 15 45.0 ± 2.8 mg/L, and of diol 17 36.9 ± 3.7 mg/L, while the new nordrimane compound 12 presented a value of 83.2 ± 3.5 mg/L.
Collapse
Affiliation(s)
- Ivan Montenegro
- Departamento de Química, Universidad Técnica Federico Santa María, Av. España N° 1680, Valparaíso 2340000, Chile; E-Mails: (A.M.); (L.E.)
| | - Luis Pino
- Departamento de Ciencias Básicas, Universidad del Biobío, Campus Fernando May, Avda. Andrés Bello s/n casilla 447, Chillán 3780000, Chile; E-Mails: (L.P.); (L.M.)
| | - Enrique Werner
- Departamento de Ciencias Básicas, Universidad del Biobío, Campus Fernando May, Avda. Andrés Bello s/n casilla 447, Chillán 3780000, Chile; E-Mails: (L.P.); (L.M.)
| | - Alejandro Madrid
- Departamento de Química, Universidad Técnica Federico Santa María, Av. España N° 1680, Valparaíso 2340000, Chile; E-Mails: (A.M.); (L.E.)
| | - Luis Espinoza
- Departamento de Química, Universidad Técnica Federico Santa María, Av. España N° 1680, Valparaíso 2340000, Chile; E-Mails: (A.M.); (L.E.)
| | - Luis Moreno
- Departamento de Ciencias Básicas, Universidad del Biobío, Campus Fernando May, Avda. Andrés Bello s/n casilla 447, Chillán 3780000, Chile; E-Mails: (L.P.); (L.M.)
| | - Joan Villena
- Escuela de Medicina, Centro de Investigaciones Biomédicas (CIB), Universidad de Valparaíso, Av. Hontaneda N° 2664, Valparaíso 234000, Chile; E-Mail:
| | - Mauricio Cuellar
- Facultad de Farmacia, Universidad de Valparaíso, Av. Gran Bretaña N° 1093, Valparaíso 234000, Chile
| |
Collapse
|
9
|
Gris A, Cabedo N, Navarro I, de Alfonso I, Agulló C, Abad-Somovilla A. General Diastereoselective Synthetic Approach toward Isospongian Diterpenes. Synthesis of (−)-Marginatafuran, (−)-Marginatone, and (−)-20-Acetoxymarginatone. J Org Chem 2012; 77:5664-80. [DOI: 10.1021/jo3008034] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antonio Gris
- Departamento de Química
Orgánica, Facultad de Química, Universidad de Valencia, Dr Moliner 50, 46100 Burjassot, Valencia,
Spain
| | - Nuria Cabedo
- Centro de Ecología
Química
Agrícola, Universidad Politécnica de Valencia, Campus de Vera, Edificio 6C, 46022 Valencia, Spain
| | - Ismael Navarro
- Departamento de Química
Orgánica, Facultad de Química, Universidad de Valencia, Dr Moliner 50, 46100 Burjassot, Valencia,
Spain
| | - Ignacio de Alfonso
- Departamento de Química
Orgánica, Facultad de Química, Universidad de Valencia, Dr Moliner 50, 46100 Burjassot, Valencia,
Spain
| | - Consuelo Agulló
- Departamento de Química
Orgánica, Facultad de Química, Universidad de Valencia, Dr Moliner 50, 46100 Burjassot, Valencia,
Spain
| | - Antonio Abad-Somovilla
- Departamento de Química
Orgánica, Facultad de Química, Universidad de Valencia, Dr Moliner 50, 46100 Burjassot, Valencia,
Spain
| |
Collapse
|
10
|
Wang ZL, Zhang ZG, Li HC, Deng WP. Concise stereoselective synthesis of marine sesterterpene, 16-deacetoxy-12-epi-scalarafuran acetate and its 14-epimer via intramolecular Diels–Alder addition. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.06.072] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
11
|
Stereoselective synthesis of marine sesterterpenes, 16-deacetoxy-scalarafuran, (+)-scalarolide and their analogs. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.092] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
12
|
Fan WY, Wang ZL, Li HC, Fossey JS, Deng WP. A straightforward and efficient synthetic access to biologically active marine sesterterpenoids, sesterstatins 4 and 5. Chem Commun (Camb) 2011; 47:2961-3. [DOI: 10.1039/c0cc04857g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
Alvarez-Manzaneda E, Chahboun R, Alvarez E, José Cano M, Haidour A, Alvarez-Manzaneda R. Enantioselective Total Synthesis of the Selective PI3 Kinase Inhibitor Liphagal. Org Lett 2010; 12:4450-3. [DOI: 10.1021/ol101173w] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Enrique Alvarez-Manzaneda
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain, and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Almería, 04120 Almería, Spain
| | - Rachid Chahboun
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain, and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Almería, 04120 Almería, Spain
| | - Esteban Alvarez
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain, and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Almería, 04120 Almería, Spain
| | - M José Cano
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain, and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Almería, 04120 Almería, Spain
| | - Ali Haidour
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain, and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Almería, 04120 Almería, Spain
| | - Ramón Alvarez-Manzaneda
- Departamento de Química Orgánica, Facultad de Ciencias, Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain, and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Almería, 04120 Almería, Spain
| |
Collapse
|
14
|
Meng XJ, Liu Y, Fan WY, Hu B, Du W, Deng WP. The first synthesis of marine sesterterpene (+)-scalarolide. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.064] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
A unified synthetic approach to trachylobane-, beyerane-, atisane- and kaurane-type diterpenes. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.062] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
16
|
Hagiwara H, Takeuchi F, Nozawa M, Hoshi T, Suzuki T. The first total synthesis and determination of the absolute configuration of chapecoderin A, B and C. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.01.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
17
|
Abad A, Agulló C, Cuñat AC, Garcı́a AB, Giménez-Saiz C. Synthetic studies on the preparation of oxygenated spongiane diterpenes from carvone. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.10.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
18
|
Domingo LR, Arnó M, Contreras R, Pérez P. Density Functional Theory Study for the Cycloaddition of 1,3-Butadienes with Dimethyl Acetylenedicarboxylate. Polar Stepwise vs Concerted Mechanisms. J Phys Chem A 2002. [DOI: 10.1021/jp012603i] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luis R. Domingo
- Instituto de Ciencia Molecular and Departamento de Química Orgánica, Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653-Santiago, Chile, and Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Correo 22, Santiago, Chile
| | - Manuel Arnó
- Instituto de Ciencia Molecular and Departamento de Química Orgánica, Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653-Santiago, Chile, and Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Correo 22, Santiago, Chile
| | - Renato Contreras
- Instituto de Ciencia Molecular and Departamento de Química Orgánica, Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653-Santiago, Chile, and Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Correo 22, Santiago, Chile
| | - Patricia Pérez
- Instituto de Ciencia Molecular and Departamento de Química Orgánica, Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain, Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653-Santiago, Chile, and Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Correo 22, Santiago, Chile
| |
Collapse
|
19
|
|