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Rodríguez R, Quiñoá E, Riguera R, Freire F. Stimuli-Directed Colorimetric Interconversion of Helical Polymers Accompanied by a Tunable Self-Assembly Process. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1805413. [PMID: 30786148 DOI: 10.1002/smll.201805413] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 01/23/2019] [Indexed: 06/09/2023]
Abstract
Interconversion between extended and bent structures at the pendant groups of a chiral polyene framework [poly(phenylacetylene) with (R)-(2-methoxy-2-phenylacetyl)glycine residues linked to 4-vinylanilines] allows the reversible colorimetric transformation from stretched to compressed helical cis-transoid polyenic structures through manipulation of the flexible spacer. This transformation generates either organogels (stretched helical form) or nanoparticles (compressed helical form) under the control of polar/low polar stimuli respectively and opens the way to the development of new sensors and stimuli-sensitive materials based on these concepts.
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Affiliation(s)
- Rafael Rodríguez
- Centro Singular de investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
| | - Emilio Quiñoá
- Centro Singular de investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
| | - Ricardo Riguera
- Centro Singular de investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
| | - Félix Freire
- Centro Singular de investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain
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Designing chiral derivatizing agents (CDA) for the NMR assignment of the absolute configuration: a theoretical and experimental approach with thiols as a case study. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.10.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Seco JM, Quiñoá E, Riguera R. Assignment of the Absolute Configuration of Polyfunctional Compounds by NMR Using Chiral Derivatizing Agents. Chem Rev 2012; 112:4603-41. [DOI: 10.1021/cr2003344] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- J. M. Seco
- Department of Organic
Chemistry and Center for Research in Biological
Chemistry and Molecular Materials (CIQUS), University of Santiago
de Compostela, E-15782 Santiago de Compostela, Spain
| | - E. Quiñoá
- Department of Organic
Chemistry and Center for Research in Biological
Chemistry and Molecular Materials (CIQUS), University of Santiago
de Compostela, E-15782 Santiago de Compostela, Spain
| | - R. Riguera
- Department of Organic
Chemistry and Center for Research in Biological
Chemistry and Molecular Materials (CIQUS), University of Santiago
de Compostela, E-15782 Santiago de Compostela, Spain
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Wenzel TJ, Chisholm CD. Using NMR spectroscopic methods to determine enantiomeric purity and assign absolute stereochemistry. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2011; 59:1-63. [PMID: 21600355 DOI: 10.1016/j.pnmrs.2010.07.003] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 07/28/2010] [Indexed: 05/30/2023]
Affiliation(s)
- Thomas J Wenzel
- Department of Chemistry, Bates College, Lewiston, Maine 04240, USA.
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Prosperini S, Pastori N, Ghilardi A, Clerici A, Punta C. New domino radical synthesis of aminoalcohols promoted by TiCl4-Zn/t-BuOOH system: selective hydroxyalkylation of amines in alcohol or in cyclic ether cosolvents. Org Biomol Chem 2011; 9:3759-67. [PMID: 21479301 DOI: 10.1039/c1ob05191a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a new and fast domino synthesis of aminoalcohols under mild conditions. The free-radical reaction of aliphatic and aromatic amines with alcohol cosolvents is promoted by means of the TiCl(4)-Zn/t-BuOOH system. According to the proposed mechanism, the amine reacts with two molecules of alcohol in an electrophilic-nucleophilic cascade process. This procedure, if compared with the TiCl(3)/t-BuOOH-mediated protocol previously reported, appears to be more selective, of more general applicability and affords the desired products in higher yields. Besides, with the same catalytic system it was possible to promote the reaction of primary arylamines with two molecules of cyclic ether, leading to the formation of a wider range of functionalized aminoalcohols.
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Affiliation(s)
- Simona Prosperini
- Dipartimento di Chimica, Materiali e Ingegneria Chimica G. Natta, Politecnico di Milano, Sezione Chimica, Milano, Italy
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Louzao I, Seco JM, Quiñoá E, Riguera R. The Use of a Single Derivative in the Configurational Assignment of Ketone Cyanohydrins. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001107] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Wenzel TJ, Chisholm CD. Assignment of absolute configuration using chiral reagents and NMR spectroscopy. Chirality 2010; 23:190-214. [DOI: 10.1002/chir.20889] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Accepted: 05/18/2010] [Indexed: 11/11/2022]
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Leiro V, Seco J, Quiñoá E, Riguera R. Using a Combination of Magnetic Anisotropic Effects for the Configurational Assignment of Amino Alcohols. Chem Asian J 2010; 5:2106-12. [DOI: 10.1002/asia.201000229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Freire F, Seco JM, Quiñoá E, Riguera R. Chiral 1,2-Diols: The Assignment of Their Absolute Configuration by NMR Made Easy. Org Lett 2009; 12:208-11. [DOI: 10.1021/ol9021639] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Félix Freire
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - José Manuel Seco
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Emilio Quiñoá
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Ricardo Riguera
- Departamento de Química Orgánica, Facultad de Química, and Unidad de RMN de Biomoléculas Asociada al CSIC, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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Freire F, Lallana E, Quiñoá E, Riguera R. The Stereochemistry of 1,2,3-Triols Revealed by1H NMR Spectroscopy: Principles and Applications. Chemistry 2009; 15:11963-75. [DOI: 10.1002/chem.200901505] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Clerici A, Ghilardi A, Pastori N, Punta C, Porta O. A New One-Pot, Four-Component Synthesis of 1,2-Amino Alcohols: TiCl3/t-BuOOH-Mediated Radical Hydroxymethylation of Imines. Org Lett 2008; 10:5063-6. [DOI: 10.1021/ol802244n] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Angelo Clerici
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano - Sezione Chimica, Via Mancinelli 7, 20131 Milano, Italy
| | - Alessandra Ghilardi
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano - Sezione Chimica, Via Mancinelli 7, 20131 Milano, Italy
| | - Nadia Pastori
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano - Sezione Chimica, Via Mancinelli 7, 20131 Milano, Italy
| | - Carlo Punta
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano - Sezione Chimica, Via Mancinelli 7, 20131 Milano, Italy
| | - Ombretta Porta
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano - Sezione Chimica, Via Mancinelli 7, 20131 Milano, Italy
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