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Alkorta I, Elguero J. Theoretical studies of conformational analysis and intramolecular dynamic phenomena. Struct Chem 2019. [DOI: 10.1007/s11224-019-01370-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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2
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Silva VLM, Silva AMS, Claramunt RM, Sanz D, Infantes L, Martínez-López Á, Reviriego F, Alkorta I, Elguero J. An Example of Polynomial Expansion: The Reaction of 3(5)-Methyl-1 H-Pyrazole with Chloroform and Characterization of the Four Isomers. Molecules 2019; 24:molecules24030568. [PMID: 30720743 PMCID: PMC6384863 DOI: 10.3390/molecules24030568] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 01/25/2019] [Accepted: 01/27/2019] [Indexed: 11/16/2022] Open
Abstract
The reaction in phase-transfer catalyzed conditions of 3(5)-methyl-1H-pyrazole with chloroform affords four isomers 333, 335, 355 and 555 in proportions corresponding to the polynomial expansion (a + b)3, with a = 0.6 and b = 0.4, a and b being 3-methyl and 5-methyl proportions. The up (u) and down (d) conformation of the pyrazolyl rings with regard to the Csp3–H atom was established by X-ray crystallography and by 1H-, 13C- and 15N-NMR in solution combined with gauge-including atomic orbitals (GIAO)/B3LYP/6-311++G(d,p) calculations. A comparison with other X-ray structures of tris-pyrazolylmethanes was carried out.
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Affiliation(s)
- Vera L M Silva
- Chemistry Department and QOPNA and LAQV-REQUIMTE, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Artur M S Silva
- Chemistry Department and QOPNA and LAQV-REQUIMTE, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Paseo Senda del Rey, 9, E-28040 Madrid, Spain.
| | - Dionisia Sanz
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Paseo Senda del Rey, 9, E-28040 Madrid, Spain.
| | - Lourdes Infantes
- Departamento de Cristalografía y Biología Estructural, Instituto de Química-Física Rocasolano, CSIC, Serrano, 119, E-28006 Madrid, Spain.
| | - Ángela Martínez-López
- Departamento de Cristalografía y Biología Estructural, Instituto de Química-Física Rocasolano, CSIC, Serrano, 119, E-28006 Madrid, Spain.
| | - Felipe Reviriego
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain.
| | - Ibon Alkorta
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain.
| | - José Elguero
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain.
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Menta S, Carradori S, Siani G, Secci D, Mannina L, Sobolev AP, Cirilli R, Pierini M. Elucidation of the mechanisms governing the thermal diastereomerization of bioactive chiral 1,3,4-thiadiazoline spiro-cyclohexyl derivatives towards their anancomeric stereoisomers. RSC Adv 2016. [DOI: 10.1039/c6ra13727j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis of bioactive 1,3,4-thiadiazoline-spiro-cyclohexyl-alkyl-substituted diastereomers by effective switching between kinetic and thermodynamic control.
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Affiliation(s)
- S. Menta
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
| | - S. Carradori
- Department of Pharmacy
- “G. D'Annunzio” University of Chieti-Pescara
- 66100 Chieti
- Italy
| | - G. Siani
- Department of Pharmacy
- “G. D'Annunzio” University of Chieti-Pescara
- 66100 Chieti
- Italy
| | - D. Secci
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
| | - L. Mannina
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
| | - A. P. Sobolev
- Laboratorio di Risonanza Magnetica “AnnalauraSegre”
- Istituto di Metodologie Chimiche CNR Area della Ricerca di Roma
- 00015 Monterotondo
- Italy
| | - R. Cirilli
- Dipartimento del Farmaco
- Istituto Superiore di Sanità
- 00161 Rome
- Italy
| | - M. Pierini
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza Università di Roma
- 00185 Rome
- Italy
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Menta S, Carradori S, Secci D, Faggi C, Mannina L, Cirilli R, Pierini M. The Anancomeric Character of the Pharmacophore 1,3,4-Thiadiazoline Framework in Chiral Spiro-Cyclohexyl Derivatives: Effects on Stereochemistry and Spiro-Junction Lability. Thermodynamic Aspects. J Org Chem 2015; 80:11932-40. [DOI: 10.1021/acs.joc.5b01635] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sergio Menta
- Dipartimento
di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Simone Carradori
- Department
of Pharmacy, “G. D’Annunzio” University of Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
| | - Daniela Secci
- Dipartimento
di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Cristina Faggi
- Dipartimento
di Chimica, Università degli studi di Firenze, Via della
Lastruccia 13, 50019 Sesto Fiorentino, Florence, Italy
| | - Luisa Mannina
- Dipartimento
di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Roberto Cirilli
- Dipartimento
del Farmaco, Istituto Superiore di Sanità, Viale Regina Elena, 299, 00161 Rome, Italy
| | - Marco Pierini
- Dipartimento
di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
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Benincori T, Bonometti V, Cirilli R, Mussini PR, Marchesi A, Pierini M, Pilati T, Rizzo S, Sannicolò F. Steric and Electronic Effects on the Configurational Stability of Residual Chiral Phosphorus-Centered Three-Bladed Propellers: Tris-aryl Phosphane Oxides. Chemistry 2012; 19:165-81. [DOI: 10.1002/chem.201201180] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 08/02/2012] [Indexed: 11/06/2022]
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Hernandez-Folgado L, Cumella JM, Morales P, Alkorta I, Elguero J, Jagerovic N. Tautomerism of hydroxychromenopyrazoles. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2011.07.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Alkorta I, Elguero J, Roussel C. Rates of enantiomerization in axially chiral 2,2′-bipyridines with restricted rotation: an ab initio study. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.06.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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A 13C and 15N experimental NMR and theoretical study of the structure of linear primary aliphatic amines and ammonium salts: from C1 to C18. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.04.067] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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