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Juanes M, Saragi RT, Enríquez L, Jaraíz M, Lesarri A. Molecular Rotation Spectrum of Tetracyclic Quinolizidines: Observation of trans-Matrine and the Elusive cis-Matrine. J Org Chem 2021; 86:1861-1867. [PMID: 33405924 DOI: 10.1021/acs.joc.0c02689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We characterized the bis-quinolizidine tetracyclic alkaloid (5S, 6S, 7R, 11R)-matrine in a supersonic jet expansion, using chirped-pulsed broadband microwave spectroscopy. Previous crystal diffraction analyses suggested 16 diastereoisomers associated with matrine's four carbon stereocenters but were inconclusive whether the lactamic nitrogen atom would additionally produce separated trans-/cis- diastereoisomers or if both species may interconvert through low potential barriers. Our experiment simultaneously detected trans- and cis-matrine through their rotational spectrum, confirming the possibility of conformational rearrangement in matrine alkaloids. The two matrine conformers mainly differ in the envelope or half-chair lactamic ring, as evidenced by the experimental rotational and nuclear quadrupole coupling parameters. Molecular orbital calculations with ab initio (MP2) and density functional methods (B3LYP-D3(BJ) and MN15) were tested against the experiment, additionally offering an estimation of the cis-/trans- barrier of 24.9-26.9 kJ mol-1. The experiment illustrates the structural potential of chirped-pulsed broadband microwave spectroscopy for high-resolution rotational studies of biomolecules in the range of 20-40 atoms.
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Affiliation(s)
- Marcos Juanes
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias-I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
| | - Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias-I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
| | - Lourdes Enríquez
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén, 11, 47011 Valladolid, Spain
| | - Martín Jaraíz
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén, 11, 47011 Valladolid, Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias-I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
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2
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Brito LSDO, Pinto FDCL, de Filho MOM, Rocha DD, Mendoza MFM, Ayala AP, Bezerra BP, Loiola MIB, Canuto KM, Silveira ER, Pessoa ODL. Tropane alkaloids from the stem bark of Erythroxylum bezerrae. PHYTOCHEMISTRY 2020; 178:112458. [PMID: 32888670 DOI: 10.1016/j.phytochem.2020.112458] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 07/08/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
Six previously undescribed tropane alkaloids, designated as erythrobezerrines A-F, were isolated from the EtOH extract from the stem bark of Erythroxylum bezerrae Plowman. Their structures were elucidated based on the interpretation of the NMR and MS data and in some instances, confirmed by X-ray diffraction analysis. The cytotoxicity of the isolated compounds was evaluated against the cancer cell lines L929, PC-3, HCT-116, SNB-19 and NCI-H460, but only erythrobezerrine C showed moderate activity with IC50 values of 3.38 and 5.43 μM for HCT-116 and NCI-H460, respectively.
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Affiliation(s)
- Luana San de O Brito
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, 60440-900, Fortaleza, CE, Brazil
| | - Francisco das Chagas L Pinto
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, 60440-900, Fortaleza, CE, Brazil
| | - Manoel Odorico M de Filho
- Departamento de Fisiologia e Farmacologia, Universidade Federal do Ceará, 60165-081, Fortaleza, CE, Brazil
| | - Danilo D Rocha
- Departamento de Fisiologia e Farmacologia, Universidade Federal do Ceará, 60165-081, Fortaleza, CE, Brazil
| | - Maria Fernanda M Mendoza
- Departamento de Fisiologia e Farmacologia, Universidade Federal do Ceará, 60165-081, Fortaleza, CE, Brazil
| | - Alejandro Pedro Ayala
- Departamento de Física, Universidade Federal do Ceará, 60440-900, Fortaleza, CE, Brazil
| | | | - Maria Iracema B Loiola
- Departamento de Biologia, Universidade Federal do Ceará, 60440-900, Fortaleza, CE, Brazil
| | - Kirley M Canuto
- Embrapa Agroindústria Tropical, R. Dra. Sara Mesquita, 2270, 60511-110, Fortaleza, CE, Brazil
| | - Edilberto R Silveira
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, 60440-900, Fortaleza, CE, Brazil
| | - Otilia Deusdenia L Pessoa
- Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, 60440-900, Fortaleza, CE, Brazil.
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3
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Insausti A, Calabrese C, Parra M, Usabiaga I, Vallejo-López M, Écija P, Basterretxea FJ, Grabow JU, Caminati W, Lesarri A, Cocinero EJ. Conformational impact of aliphatic side chains in local anaesthetics: benzocaine, butamben and isobutamben. Chem Commun (Camb) 2020; 56:6094-6097. [PMID: 32352456 DOI: 10.1039/d0cc00760a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We studied the impact of aliphatic side chains on the stability and conformational landscape of the local anaesthetics benzocaine, butamben and isobutamben, combining high-resolution rotational spectroscopy in the microwave and millimetre regions and molecular modelling. The study reveals the connections between alkyl chain flexibility and molecular conformations.
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Affiliation(s)
- A Insausti
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Leioa, 48940, Spain.
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4
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Vallejo-López M, Écija P, Vogt N, Demaison J, Lesarri A, Basterretxea FJ, Cocinero EJ. N-Methyl Inversion and Accurate Equilibrium Structures in Alkaloids: Pseudopelletierine. Chemistry 2017; 23:16491-16496. [PMID: 28759141 DOI: 10.1002/chem.201702232] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Indexed: 11/06/2022]
Abstract
A rotational spectroscopy investigation has resolved the conformational equilibrium and structural properties of the alkaloid pseudopelletierine. Two different conformers, which originate from inversion of the N-methyl group from an axial to an equatorial position, have been unambiguously identified in the gas phase, and nine independent isotopologues have been recorded by Fourier-transform microwave spectroscopy in a jet expansion. Both conformers share a chair-chair configuration of the two bridged six-membered rings. The conformational equilibrium is displaced towards the axial form, with a relative population in the supersonic jet of Naxial /Nequatorial ≈2/1. An accurate equilibrium structure has been determined by using the semiexperimental mixed-estimation method and alternatively computed by quantum-chemical methods up to the coupled-cluster level of theory. A comparison with the N-methyl inversion equilibria in related tropanes is also presented.
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Affiliation(s)
- Montserrat Vallejo-López
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| | - Patricia Écija
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| | - Natalja Vogt
- Chemical Information Systems, Faculty of Sciences, University of Ulm, 89069, Ulm, Germany
| | - Jean Demaison
- Chemical Information Systems, Faculty of Sciences, University of Ulm, 89069, Ulm, Germany
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011, Valladolid, Spain
| | - Francisco J Basterretxea
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| | - Emilio J Cocinero
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
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5
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Wachsmuth D, Jahn MK, Blanco S, Gigosos MA, Lesarri A, Grabow JU. Inversion of Bicyclic Decanes: Rotational Spectra of the Trans
and Double Cis
Conformations of 2-Decalone. Chemphyschem 2017; 18:3620-3624. [DOI: 10.1002/cphc.201700848] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 09/08/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Dennis Wachsmuth
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A; Gottfried-Wilhelm-Leibniz-Universität; Callinstrasse 3A, D- 30167 Hannover Germany
| | - Michaela K. Jahn
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A; Gottfried-Wilhelm-Leibniz-Universität; Callinstrasse 3A, D- 30167 Hannover Germany
| | - Susana Blanco
- Departamento de Química Física y Química Inorgánica; Universidad de Valladolid; Paseo de Belén, 7 47011 Valladolid Spain
| | - Marco A. Gigosos
- Departamento de Física Teórica, Atómica y Óptica; Universidad de Valladolid; Paseo de Belén, 7 47011 Valladolid Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica; Universidad de Valladolid; Paseo de Belén, 7 47011 Valladolid Spain
| | - Jens-Uwe Grabow
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A; Gottfried-Wilhelm-Leibniz-Universität; Callinstrasse 3A, D- 30167 Hannover Germany
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Thomas J, Mariona E, Xu Y. Rotational spectra of two six-membered heterocyclic N-methyl-piperidinol compounds: Conformations by OH rotation, N-methyl inversion, and ring puckering. J Chem Phys 2017; 146:104303. [DOI: 10.1063/1.4977895] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Javix Thomas
- Department of Chemistry, University of Alberta, Edmonton T6G 2G2, Canada
| | - Eric Mariona
- Department of Chemistry, University of Alberta, Edmonton T6G 2G2, Canada
| | - Yunjie Xu
- Department of Chemistry, University of Alberta, Edmonton T6G 2G2, Canada
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7
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Calabrese C, Maris A, Uriarte I, Cocinero EJ, Melandri S. Effects of Chlorination on the Tautomeric Equilibrium of 2‐Hydroxypyridine: Experiment and Theory. Chemistry 2016; 23:3595-3604. [DOI: 10.1002/chem.201604891] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Camilla Calabrese
- Dipartimento di Chimica “G. Ciamician” Università degli Studi di Bologna Via Selmi 2 40126 Bologna Italy
| | - Assimo Maris
- Dipartimento di Chimica “G. Ciamician” Università degli Studi di Bologna Via Selmi 2 40126 Bologna Italy
| | - Iciar Uriarte
- Dpto. Química Física Universidad del País Vasco (UPV/EHU) Apartado 644 48080 Bilbao Spain
| | - Emilio J. Cocinero
- Dpto. Química Física Universidad del País Vasco (UPV/EHU) Apartado 644 48080 Bilbao Spain
| | - Sonia Melandri
- Dipartimento di Chimica “G. Ciamician” Università degli Studi di Bologna Via Selmi 2 40126 Bologna Italy
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8
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Écija P, Vallejo-López M, Uriarte I, Basterretxea FJ, Lesarri A, Fernández JA, Cocinero EJ. Scopine Isolated in the Gas Phase. Chemphyschem 2016; 17:3030-3034. [DOI: 10.1002/cphc.201600368] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 06/16/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Patricia Écija
- Departamento de Química Física; Facultad de Ciencia y Tecnología; Universidad del País Vasco (UPV/EHU); Apartado 644 48080 Bilbao Spain
| | - Montserrat Vallejo-López
- Departamento de Química Física; Facultad de Ciencia y Tecnología; Universidad del País Vasco (UPV/EHU); Apartado 644 48080 Bilbao Spain
| | - Iciar Uriarte
- Departamento de Química Física; Facultad de Ciencia y Tecnología; Universidad del País Vasco (UPV/EHU); Apartado 644 48080 Bilbao Spain
| | - Francisco J. Basterretxea
- Departamento de Química Física; Facultad de Ciencia y Tecnología; Universidad del País Vasco (UPV/EHU); Apartado 644 48080 Bilbao Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica; Facultad de Ciencias; Universidad de Valladolid; Spain
| | - José A. Fernández
- Departamento de Química Física; Facultad de Ciencia y Tecnología; Universidad del País Vasco (UPV/EHU); Apartado 644 48080 Bilbao Spain
| | - Emilio J. Cocinero
- Departamento de Química Física; Facultad de Ciencia y Tecnología; Universidad del País Vasco (UPV/EHU); Apartado 644 48080 Bilbao Spain
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9
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Écija P, Uriarte I, Basterretxea FJ, Millán J, Lesarri A, Fernández JA, Cocinero EJ. Structural distortion of the epoxy groups in norbornanes: a rotational study of exo-2,3-epoxynorbornane. Chemphyschem 2015; 16:2609-14. [PMID: 26182910 DOI: 10.1002/cphc.201500334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Indexed: 11/07/2022]
Abstract
Exo-2,3-epoxynorbornane is studied in the gas phase by pulsed jet Fourier transform microwave spectroscopy in the 4-18 GHz region. Six isotopologues were observed and characterized in their natural abundance. The experimental substitution and effective structures were obtained. Comparison with the structure of norbornane shows significant differences in several bond lengths and valence angles upon introduction of the epoxy group. All the work is supported by quantum chemical calculations.
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Affiliation(s)
- Patricia Écija
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48080 Bilbao (Spain)http://grupodeespectroscopia.es/MW/
| | - Iciar Uriarte
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48080 Bilbao (Spain)http://grupodeespectroscopia.es/MW/
| | - Francisco J Basterretxea
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48080 Bilbao (Spain)http://grupodeespectroscopia.es/MW/
| | - Judith Millán
- Departamento de Química, Facultad de Ciencias, Estudios Agroalimentarios e Informática, Universidad de La Rioja, 26006 Logroño (Spain)
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid (Spain)
| | - José A Fernández
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48080 Bilbao (Spain)http://grupodeespectroscopia.es/MW/
| | - Emilio J Cocinero
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48080 Bilbao (Spain)http://grupodeespectroscopia.es/MW/.
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10
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Sidorowicz K, Ratkiewicz A, Nodzewska A, Lazny R. Determination of the N-invertomer stereochemistry in N-substituted nortropanones and norgranatanones using computational and NMR methods. CR CHIM 2015. [DOI: 10.1016/j.crci.2014.10.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Ecija P, Vallejo-López M, Evangelisti L, Fernández JA, Lesarri A, Caminati W, Cocinero EJ. O-H⋅⋅⋅N and C-H⋅⋅⋅O hydrogen bonds control hydration of pivotal tropane alkaloids: tropinone⋅⋅⋅H(2)O complex. Chemphyschem 2014; 15:918-23. [PMID: 24616173 DOI: 10.1002/cphc.201301213] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Indexed: 11/07/2022]
Abstract
The effect of monohydration in equatorial/axial isomerism of the common motif of tropane alkaloids is investigated in a supersonic expansion by using Fourier-transform microwave spectroscopy. The rotational spectrum reveals the equatorial isomer as the dominant species in the tropinone⋅⋅⋅H2 O complex. The monohydrated complex is stabilized primarily by a moderate OH⋅⋅⋅N hydrogen bond. In addition, two CH⋅⋅⋅O weak hydrogen bonds also support this structure, blocking the water molecule and avoiding any molecular dynamics in the complex. The water molecule acts as proton donor and chooses the ternary amine group over the carbonyl group as a proton acceptor. The experimental work is supported by theoretical calculations; the accuracy of the B3LYP, M06-2X, and MP2 methods is also discussed.
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Affiliation(s)
- Patricia Ecija
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48940 Bilbao (Spain) http://grupodeespectroscopia.es/MW/
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12
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Lazny R, Wolosewicz K, Ratkiewicz A, Pioro D, Stocki M. Synthesis and isomer distribution of 2-alkyltropinones and 2-alkylgranatanones. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Jahn MK, Dewald D, Vallejo-López M, Cocinero EJ, Lesarri A, Grabow JU. Rotational spectra of bicyclic decanes: the trans conformation of (-)-lupinine. J Phys Chem A 2013; 117:13673-9. [PMID: 24028578 DOI: 10.1021/jp407671m] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conformational and structural properties of the bicyclic quinolizidine alkaloid (-)-lupinine have been investigated in a supersonic jet expansion using microwave spectroscopy. The rotational spectrum is consistent with a single dominant trans conformation within a double-chair skeleton, which is stabilized by more than 10.4 kJ mol(-1) with respect to other conformations. In the isolated conditions of the jet, the hydroxy methyl side chain of the molecule locks in to form an intramolecular O-H···N hydrogen bond to the electron lone pair at the nitrogen atom. Accurate rotational constants, centrifugal distortion corrections, and (14)N nuclear quadrupole coupling parameters are reported and compared to ab initio (MP2) and DFT (M06-2X) calculations. The stability of lupinine is further compared computationally with epilupinine and decaline in order to gauge the influence of intramolecular hydrogen bonding, absent in these molecules.
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Affiliation(s)
- Michaela K Jahn
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Gottfried-Wilhelm-Leibniz Universität , Callinstraße 3A, D-30167 Hannover, Germany
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14
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Écija P, Cocinero EJ, Lesarri A, Fernández JA, Caminati W, Castaño F. Rotational spectroscopy of antipyretics: conformation, structure, and internal dynamics of phenazone. J Chem Phys 2013; 138:114304. [PMID: 23534636 DOI: 10.1063/1.4794693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The conformational and structural preferences of phenazone (antipyrine), the prototype of non-opioid pyrazolone antipyretics, have been probed in a supersonic jet expansion using rotational spectroscopy. The conformational landscape of the two-ring assembly was first explored computationally, but only a single conformer was predicted, with the N-phenyl and N-methyl groups on opposite sides of the pyrazolone ring. Consistently, the microwave spectrum evidenced a rotational signature arising from a single molecular structure. The spectrum exhibited very complicated fine and hyperfine patterns (not resolvable with any other spectroscopic technique) originated by the simultaneous coupling of the methyl group internal rotation and the spins of the two (14)N nuclei with the overall rotation. The internal rotation tunnelling was ascribed to the C-CH3 group and the barrier height established experimentally (7.13(10) kJ mol(-1)). The internal rotation of the N-CH3 group has a lower limit of 9.4 kJ mol(-1). The structure of the molecule was determined from the rotational parameters, with the phenyl group elevated ca. 25° with respect to the average plane of the pyrazolic moiety and a phenyl torsion of ca. 52°. The origin of the conformational preferences is discussed in terms of the competition between intramolecular C-H···N and C-H···O weak hydrogen bonds.
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Affiliation(s)
- Patricia Écija
- Departamento de Química Física, Universidad del País Vasco (UPV-EHU), Ap. 644, 48080 Bilbao, Spain
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15
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Écija P, Cocinero EJ, Lesarri A, Basterretxea FJ, Fernández JA, Castaño F. The distorted tropane of scopoline. Chemphyschem 2013; 14:1830-5. [PMID: 23640872 DOI: 10.1002/cphc.201300199] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Indexed: 11/08/2022]
Abstract
The structural isomerization of scopine into scopoline (oscine) has been observed in a supersonic jet expansion using microwave spectroscopy. The rotational spectrum evidences a single structure in the gas phase, providing a first description of the (three-ring) structurally distorted tropane in scopoline. The absence of rotational signatures of any scopine conformation suggests a practically quantitative isomerization at the vaporization temperatures of the experiment (ca. 90 °C). The determined rotational parameters of scopoline reveal the structural consequences of the intramolecular cyclation of scopine, which breaks the original epoxy group and creates a new ether bridge and a 7β-hydroxytropane configuration. The hydroxy group further stabilizes the molecule by an O-H⋅⋅⋅N intramolecular hydrogen bond, which, in turn, forces the N-methyl group to the less stable axial form. Supporting ab initio (MP2) and DFT (B3LYP, M06-2X) calculations are included.
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Affiliation(s)
- Patricia Écija
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado 644, 48080 Bilbao, Spain
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16
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Écija P, Basterretxea FJ, Lesarri A, Millán J, Castaño F, Cocinero EJ. Single Hydration of the Peptide Bond: The Case of the Vince Lactam. J Phys Chem A 2012; 116:10099-106. [DOI: 10.1021/jp3072734] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Patricia Écija
- Departamento de Química
Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Campus
de Leioa, Ap. 644, E-48080 Bilbao, Spain
| | - Francisco J. Basterretxea
- Departamento de Química
Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Campus
de Leioa, Ap. 644, E-48080 Bilbao, Spain
| | - Alberto Lesarri
- Departamento de Química
Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, E-47011 Valladolid, Spain
| | - Judith Millán
- Departamento de Química,
Facultad de Ciencias, Estudios Agroalimentarios e Informática, Universidad de La Rioja, E-26006 Logroño, Spain
| | - Fernando Castaño
- Departamento de Química
Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Campus
de Leioa, Ap. 644, E-48080 Bilbao, Spain
| | - Emilio J. Cocinero
- Departamento de Química
Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Campus
de Leioa, Ap. 644, E-48080 Bilbao, Spain
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Demaison J, Craig NC, Cocinero EJ, Grabow JU, Lesarri A, Rudolph HD. Semiexperimental Equilibrium Structures for the Equatorial Conformers of N-Methylpiperidone and Tropinone by the Mixed Estimation Method. J Phys Chem A 2012; 116:8684-92. [PMID: 22861349 DOI: 10.1021/jp304178n] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jean Demaison
- Laboratoire de Physique des
Lasers, Atomes et Molécules, Université de Lille I, 59655 Villeneuve d’Ascq Cedex, France
| | - Norman C. Craig
- Department of Chemistry and
Biochemistry, Oberlin College, Oberlin,
Ohio 44074, United States
| | - Emilio J. Cocinero
- Departamento de Química
Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Apartado
644, E-48080 Bilbao, Spain
| | - Jens-Uwe Grabow
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Gottfried-Wilhelm-Leibniz-Universität, Callinstraße 3A, D-30167 Hannover, Germany
| | - Alberto Lesarri
- Departamento de Química
Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, E-47011 Valladolid, Spain
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Lazny R, Ratkiewicz A, Nodzewska A, Wynimko A, Siergiejczyk L. Determination of the N-methyl stereochemistry in tropane and granatane derivatives in solution: a computational and NMR spectroscopic study. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.076] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Cocinero EJ, Lesarri A, Écija P, Basterretxea FJ, Grabow JU, Fernández JA, Castaño F. Ribose Found in the Gas Phase. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201107973] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Cocinero EJ, Lesarri A, Écija P, Basterretxea FJ, Grabow JU, Fernández JA, Castaño F. Ribose Found in the Gas Phase. Angew Chem Int Ed Engl 2011; 51:3119-24. [DOI: 10.1002/anie.201107973] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Indexed: 11/11/2022]
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Evangelisti L, Lesarri A, Jahn MK, Cocinero EJ, Caminati W, Grabow JU. N-Methyl Inversion and Structure of Six-Membered Heterocyclic Rings: Rotational Spectrum of 1-Methyl-4-piperidone. J Phys Chem A 2011; 115:9545-51. [DOI: 10.1021/jp112425w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luca Evangelisti
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via Selmi, 2, I-40126 Bologna, Italy
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, E-47011 Valladolid, Spain
| | - Michaela K. Jahn
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Gottfried-Wilhelm-Leibniz-Universität, Callinstrasse 3A, D-30167 Hannover, Germany
| | - Emilio J. Cocinero
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Ap. 644, E-48080 Bilbao, Spain
| | - Walther Caminati
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via Selmi, 2, I-40126 Bologna, Italy
| | - Jens-Uwe Grabow
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Gottfried-Wilhelm-Leibniz-Universität, Callinstrasse 3A, D-30167 Hannover, Germany
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Écija P, Cocinero EJ, Lesarri A, Millán J, Basterretxea F, Fernández JA, Castaño F. Discriminating the structure ofexo-2-aminonorbornane using nuclear quadrupole coupling interactions. J Chem Phys 2011; 134:164311. [DOI: 10.1063/1.3583494] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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23
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Cocinero EJ, Basterretxea FJ, Écija P, Lesarri A, Fernández JA, Castaño F. Conformational behaviour, hydrogen bond competition and intramolecular dynamics in vanillin derivatives: acetovanillone and 6-hydroxy-3-methoxyacetophenone. Phys Chem Chem Phys 2011; 13:13310-8. [DOI: 10.1039/c0cp02418j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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The Conformational Landscape of Nicotinoids: Solving the Conformational Disparity of Anabasine. Chemistry 2010; 16:10214-9. [DOI: 10.1002/chem.201000849] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Cocinero EJ, Lesarri A, Écija P, Grabow JU, Fernández JA, Castaño F. Conformational equilibria in vanillin and ethylvanillin. Phys Chem Chem Phys 2010; 12:12486-93. [DOI: 10.1039/c0cp00585a] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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