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Batista PMR, Martins CDF, Raposo MMM, Costa SPG. Novel Crown Ether Amino Acids as Fluorescent Reporters for Metal Ions. Molecules 2023; 28:molecules28083326. [PMID: 37110560 PMCID: PMC10140843 DOI: 10.3390/molecules28083326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/06/2023] [Accepted: 04/07/2023] [Indexed: 04/29/2023] Open
Abstract
Unnatural amino acids with enhanced properties, such as increased complexing ability and luminescence, are considered to be highly attractive building blocks for bioinspired frameworks, such as probes for biomolecule dynamics, sensitive fluorescent chemosensors, and peptides for molecular imaging, among others. Therefore, a novel series of highly emissive heterocyclic alanines bearing a benzo[d]oxazolyl unit functionalized with different heterocyclic π-spacers and (aza)crown ether moieties was synthesized. The new compounds were completely characterized using the usual spectroscopic techniques and evaluated as fluorimetric chemosensors in acetonitrile and aqueous mixtures in the presence of various alkaline, alkaline-earth, and transition metal ions. The different crown ether binding moieties as well as the electronic nature of the π-bridge allowed for fine tuning of the sensory properties of these unnatural amino acids towards Pd2+ and Fe3+, as seen by spectrofluorimetric titrations.
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Affiliation(s)
- Patrícia M R Batista
- Centre of Chemistry, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
| | - Cátia D F Martins
- Centre of Chemistry, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
| | - M Manuela M Raposo
- Centre of Chemistry, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
| | - Susana P G Costa
- Centre of Chemistry, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal
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Agirre M, Bello T, Zhou J, Retamosa MDG, Cossío FP. Synthesis of Bicyclic Hemiacetals Catalyzed by Unnatural Densely Substituted γ-Dipeptides. J Org Chem 2022; 87:14819-14824. [PMID: 36178434 PMCID: PMC9639056 DOI: 10.1021/acs.joc.2c01230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The asymmetric synthesis of bicyclic highly substituted tetrahydropyrans is described. The reaction is catalyzed by unnatural γ-dipeptides based on densely substituted l- and d-proline derivatives. This organocatalytic one-pot reaction takes place among a ketone, a nitroalkene, and an aldehyde to yield an octahydro-2H-chromene scaffold. Monomeric species, from which the corresponding γ-dipeptides are synthesized, cannot catalyze the reaction, thus confirming the emergent nature of the catalytic behavior of these dimeric species.
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Affiliation(s)
- Maddalen Agirre
- Departamento
de Química Orgánica I, University
of the Basque Country (UPV/EHU), P° Manuel Lardizabal 3, 20018 Donostia-San Sebastián, Spain,CIC
Energigune, Parque Tecnológico de
Álava, 01510 Vitoria-Gasteiz, Spain
| | - Tamara Bello
- Departamento
de Química Orgánica I, University
of the Basque Country (UPV/EHU), P° Manuel Lardizabal 3, 20018 Donostia-San Sebastián, Spain,Quimatryx
Ltd., Parque Tecnológico
de Gipuzkoa, 2009 Donostia-San Sebastián, Spain
| | - Jinxiu Zhou
- Departamento
de Química Orgánica I, University
of the Basque Country (UPV/EHU), P° Manuel Lardizabal 3, 20018 Donostia-San Sebastián, Spain,Department
of Polymer Science and Technology, Institute
of Polymer Materials, University of the Basque Country (UPV/EHU), P° Manuel Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - María de Gracia Retamosa
- Instituto
de Síntesis Orgánica y Departamento de Química
Orgánica, Universidad de Alicante 03080 Alicante, Spain,Centro de
Innovación en Química Avanzada (ORFEO-CINQA), https://orfeocinqa.es/,Donostia
International Physics Center (DIPC), P° Manuel Lardizabal 4, 20018 Donostia-San Sebastián, Spain,
| | - Fernando P. Cossío
- Departamento
de Química Orgánica I, University
of the Basque Country (UPV/EHU), P° Manuel Lardizabal 3, 20018 Donostia-San Sebastián, Spain,Centro de
Innovación en Química Avanzada (ORFEO-CINQA), https://orfeocinqa.es/,Donostia
International Physics Center (DIPC), P° Manuel Lardizabal 4, 20018 Donostia-San Sebastián, Spain,
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Wayment AX, Rodriguez Moreno M, Jones CJ, Smith GJ, Jarman P, Garcia Morin NJ, Coombs MJ, Parkman JA, Barlow CD, Allington Smith S, Burt SR, Michaelis DJ. Optimizing the Local Chemical Environment on a Bifunctional Helical Peptide Scaffold Enables Enhanced Enantioselectivity and Cooperative Catalysis. Org Lett 2022; 24:2983-2988. [PMID: 35442694 PMCID: PMC9248067 DOI: 10.1021/acs.orglett.2c00857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe a proof-of-concept study in which peptide-bound enamine and thiourea catalysts are used to facilitate the conjugate addition of cyclohexanone to nitroolefins. Our bifunctional peptide scaffold is modified to optimize the local environment around both catalysts to enhance both reactivity and enantioselectivity, affording selectivities of ≤95% ee. Circular dichroism, nuclear magnetic resonance nuclear Overhauser effect studies, and molecular dynamics simulations verify the helical structure of our catalyst in solution and the importance of the secondary structure in catalysis.
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Affiliation(s)
- Adam X Wayment
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Mariur Rodriguez Moreno
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Carter J Jones
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Gabriel J Smith
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Parker Jarman
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Nayeli J Garcia Morin
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Morgan J Coombs
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Jacob A Parkman
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Connor D Barlow
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Stacy Allington Smith
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Scott R Burt
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - David J Michaelis
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
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