1
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Rondelli M, Delgado-Hernández S, Daranas AH, Martín T. Conformational control enables boroxine-to-boronate cage metamorphosis. Chem Sci 2023; 14:12953-12960. [PMID: 38023528 PMCID: PMC10664459 DOI: 10.1039/d3sc02920d] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 10/05/2023] [Indexed: 12/01/2023] Open
Abstract
The discovery of molecular organic cages (MOCs) is inhibited by the limited organic-chemical space of the building blocks designed to fulfill strict geometric requirements for efficient assembly. Using intramolecular attractive or repulsive non-covalent interactions to control the conformation of flexible systems can effectively augment the variety of building blocks, ultimately facilitating the exploration of new MOCs. In this study, we introduce a set of boronic acid tripods that were designed using rational design principles. Conformational control was induced by extending the tripod's arms by a 2,3-dimethylbenzene unit, leading to the efficient formation of a tetrapodal nanometer-sized boroxine cage. The new building block's versatility was demonstrated by performing cage metamorphosis upon adding an aromatic tetraol. This led to a quantitative boroxine-to-boronate transformation and a topological shift from tetrahedral to trigonal bipyramidal.
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Affiliation(s)
- Manuel Rondelli
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Doctoral and Postgraduate School, University of La Laguna (ULL) 38200 La Laguna Tenerife Spain
| | - Samuel Delgado-Hernández
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Departamento de Química, Unidad Departamental de Química Analítica, Universidad de La Laguna (ULL) 38206 La Laguna Tenerife Spain
| | - Antonio H Daranas
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Instituto Universitario de Bio-Orgánica "Antonio González", ULL Avda. Astrofísico Francisco Sánchez, 2 38206 La Laguna Tenerife Spain
| | - Tomás Martín
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Instituto Universitario de Bio-Orgánica "Antonio González", ULL Avda. Astrofísico Francisco Sánchez, 2 38206 La Laguna Tenerife Spain
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2
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Rondelli M, Daranas AH, Martín T. Importance of Precursor Adaptability in the Assembly of Molecular Organic Cages. J Org Chem 2023; 88:2113-2121. [PMID: 36730713 PMCID: PMC9942191 DOI: 10.1021/acs.joc.2c02523] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
For molecular architectures based on dynamic covalent chemistry (DCvC), strict preorganization is a paradigmatic concept and the generally accepted strategy for their rational design. This results in the creation of highly rigid building blocks which are expected to fulfill the ideal geometry of the assembly, coming at a price that small geometric mismatches result in unpredicted and/or unproductive reaction outcomes. In this study, we show that feet of a tripodal platform have a great influence on the assembly of tetrahedral organic cages based on boronate ester formation. The aryl benzyl ether-functionalized building blocks perform significantly better than their alkyl-functionalized equivalents. Experimentally and using density functional theory geometry optimization of the cage structures, we prove that unexpectedly, this is not due to solubility but because of the enhanced capability of the aryl benzyl ether-functionalized building blocks to fit the ideal geometry of the assembly. This introduces the concept of building block adaptability to overcome geometrical mismatches in DCvC systems.
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Affiliation(s)
- Manuel Rondelli
- Instituto
de Productos Naturales y Agrobiología, Consejo Superior de
Investigaciones Científicas (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez,
3, 38206 La Laguna, Tenerife, Spain,Doctoral
and Postgraduate School, University of La
Laguna, Avda. Astrofísico
Francisco Sánchez, 38203 La Laguna, Tenerife, Spain
| | - Antonio H. Daranas
- Instituto
de Productos Naturales y Agrobiología, Consejo Superior de
Investigaciones Científicas (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez,
3, 38206 La Laguna, Tenerife, Spain,Instituto
Universitario de Bio-Orgánica “Antonio González”, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez,
2, 38206 La Laguna, Tenerife, Spain,
| | - Tomás Martín
- Instituto
de Productos Naturales y Agrobiología, Consejo Superior de
Investigaciones Científicas (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez,
3, 38206 La Laguna, Tenerife, Spain,Instituto
Universitario de Bio-Orgánica “Antonio González”, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez,
2, 38206 La Laguna, Tenerife, Spain,
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3
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Rathnayaka RMC, George S, Abeysinghe JP, Lynch VM, Gross DE. Synthetic, spectroscopic, and computational investigations of readily accessible 2‐phenyl‐3‐alkylbenzoxazaboroles. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Sobiya George
- Department of Chemistry Sam Houston State University Huntsville Texas United States
| | - Janaka P. Abeysinghe
- Department of Chemistry Sam Houston State University Huntsville Texas United States
| | - Vincent M. Lynch
- Department of Chemistry The University of Texas at Austin Austin Texas United States
| | - Dustin E. Gross
- Department of Chemistry Sam Houston State University Huntsville Texas United States
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4
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Frey L, Jarju JJ, Salonen LM, Medina DD. Boronic-acid-derived covalent organic frameworks: from synthesis to applications. NEW J CHEM 2021. [DOI: 10.1039/d1nj01269j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Modular, well-defined, and robust hierarchical functional materials are targets of numerous synthesis endeavors.
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Affiliation(s)
- Laura Frey
- Department of Chemistry, Ludwig-Maximilians-Universität (LMU) & Center for NanoScience (CeNS), Butenandtstr. 11, 81377 Munich, Germany
| | - Jenni J. Jarju
- International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Laura M. Salonen
- International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Dana D. Medina
- Department of Chemistry, Ludwig-Maximilians-Universität (LMU) & Center for NanoScience (CeNS), Butenandtstr. 11, 81377 Munich, Germany
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5
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Zhang X, Wang S, Jiang Z, Li Y, Jing X. Boronic Ester Based Vitrimers with Enhanced Stability via Internal Boron-Nitrogen Coordination. J Am Chem Soc 2020; 142:21852-21860. [PMID: 33332118 DOI: 10.1021/jacs.0c10244] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Boron-containing polymers have many applications resulting from their prominent properties. Organoboron species with reversible B-O bonds have been successfully employed for the fabrication of various self-healing/healable and reprocessable polymers. However, the application of the polymers containing boronic ester or boroxine linkages is limited because of their instability to water. Herein, we report the hydrolytic stability and dynamic covalent chemistry of the nitrogen-coordinating cyclic boronic diester (NCB) linkages, and a new class of vitrimers based on NCB linkages is developed through the chemical reactions of reactive hydrogen with isocyanate. Thermodynamic and kinetic studies demonstrated that NCB linkages exhibit enhanced water and heat resistance, whereas the exchange reactions between NCB linkages can take place upon heating without any catalyst. The model compounds of NCBC-X1 and NCBC-X2 containing a urethane group and urea group, respectively, also showed higher hydrolytic stability compared to that of conventional boronic esters. Polyurethane vitrimers and poly(urea-urethane) vitrimers based on NCB linkages exhibited excellent solvent resistance and mechanical properties like general thermosets, which can be repaired, reprocessed, and recycled via the transesterification of NCB linkages upon heating. Especially, vitrimers based on NCB linkages presented improved stability to water and heat compared to those through conventional boronic esters because of the existence of N → B internal coordination. We anticipate that this work will provide a new strategy for designing the next generation of sustainable materials.
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Affiliation(s)
- Xiaoting Zhang
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China
| | - Shujuan Wang
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China
| | - Zikang Jiang
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China
| | - Yu Li
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China
| | - Xinli Jing
- School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China.,MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an, Shaanxi 710049, P. R. China.,Xi'an Key Laboratory of Sustainable Energy Material Chemistry, Xi'an, Shaanxi 710049, P. R. China
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6
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Martínez-Aguirre MA, Flores-Alamo M, Medrano F, Yatsimirsky AK. Examination of pinanediol-boronic acid ester formation in aqueous media: relevance to the relative stability of trigonal and tetrahedral boronate esters. Org Biomol Chem 2020; 18:2716-2726. [PMID: 32211727 DOI: 10.1039/d0ob00201a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The interaction of pinanediol with 2-fluorophenylboronic acid and several other substituted phenylboronic acids was studied in 40% vol. aqueous acetonitrile by 1H and 11B NMR, potentiometric and spectrophotometric titrations at variable pH values. The experimental results reveal the formation of a very stable trigonal ester (Ktrig ≈ 2 × 104 M-1) and a significantly less stable tetrahedral hydroxocomplex (Ktet ≈ 5 × 103 M-1) in contrast to the traditionally observed inverted order of stabilities Ktrig < Ktet. Comparison of the crystal structure of the trigonal ester isolated from aqueous acetonitrile with the DFT simulated structure of the respective hydroxocomplex shows that an unusual order of stabilities Ktrig > Ktet is observed in spite of the existence of the usual strain release effect in the O-B-O angle considered responsible for the typically observed increased stability of the tetrahedral hydroxocomplex. A complementary study of the stability of the six-membered cyclic boronate esters of chromotropic acid demonstrated the order Ktrig ≪ Ktet although the strain was absent in these esters. The results for m-, p-substituted phenylboronic acids show that the stability of both five- and six-membered trigonal esters formed with pinanediol and chromotropic acid, respectively, is insensitive to electronic effects but the electron accepting substituents stabilize the hydroxocomplexes. It follows from the whole set of results that Ktet can be much larger than Ktrig in the absence of the strain, but with a sufficiently acidic diol, and that the presence of the strain does not necessarily make Ktet larger than Ktrig for a less acidic diol with a purely saturated hydrocarbon backbone. Thus, the electronic effects manifested in the acidity of the diol appear to be more significant than the strain release effect in determining the Ktet/Ktrig ratio.
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Affiliation(s)
| | - Marcos Flores-Alamo
- Facultad de Química, Universidad Nacional Autónoma de México, 04510 México D.F., Mexico.
| | - Felipe Medrano
- Departamento de Ciencias químico-biológicas, Universidad de Sonora, Rosales y Luis Encinas Johnson s/n, Centro 83000, Hermosillo, Sonora, Mexico
| | - Anatoly K Yatsimirsky
- Facultad de Química, Universidad Nacional Autónoma de México, 04510 México D.F., Mexico.
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7
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Ohishi T, Igarashi K, Kadosono H, Kikkawa S, Azumaya I, Yokoyama A. Synthesis and structural analysis of conjugated benzoxazaborine derivatives. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.10.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Lopalco A, Stella VJ, Thompson WH. Origins, and formulation implications, of the pK difference between boronic acids and their esters: A density functional theory study. Eur J Pharm Sci 2018; 124:10-16. [DOI: 10.1016/j.ejps.2018.08.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 08/09/2018] [Accepted: 08/12/2018] [Indexed: 10/28/2022]
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9
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An Z, Wu M, Kang J, Ni J, Qi Z, Yuan B, Yan R. Synthesis of Fused B-Containing Heterocyclic Compounds and Their Relevant Optical Properties. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701790] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zhenyu An
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
| | - Mingzhong Wu
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
| | - Jie Kang
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
| | - Jixiang Ni
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
| | - Zhenjie Qi
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
| | - Bingxiang Yuan
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
| | - Rulong Yan
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; Lanzhou, Gansu China
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10
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Schröder J, Himmel D, Böttcher T. 2,6-Bis(diazaboryl)pyridine: A Superbasic Sterically Demanding Pyridine Ligand. Chemistry 2017. [PMID: 28643874 DOI: 10.1002/chem.201702890] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Herein a convenient one-pot route to a sterically demanding superbasic pyridine is presented. Functionalization of the 2- and 6-positions with the strongly σ-donating boryl-groups shifts the calculated gas phase basicity of the pyridine nitrogen atom to 1012 kJ mol-1 , which outperforms the "proton sponge" 1,8-bis(dimethylamino)naphthalene (996 kJ mol-1 ). The diazaboryl groups are oriented orthogonally to the pyridine ring and do not block the N-position, which resembles the geometry of commonly used N-heterocyclic carbenes. This allows the substituted pyridine to be used as a neutral N-donor ligand in coordination chemistry that is demonstrated herein with the Lewis adducts of haloboranes. Contrary to NHCs, which can form extraordinarily stable adducts, the pyridine ligand is intended to act as a weaker-coordinating alternative and could allow for alternative ligand chemistry.
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Affiliation(s)
- Jan Schröder
- Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 19, 79104, Freiburg, Germany
| | - Daniel Himmel
- Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 19, 79104, Freiburg, Germany
| | - Tobias Böttcher
- Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 19, 79104, Freiburg, Germany
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11
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Röttger M, Domenech T, van der Weegen R, Breuillac A, Nicolaÿ R, Leibler L. High-performance vitrimers from commodity thermoplastics through dioxaborolane metathesis. Science 2017; 356:62-65. [DOI: 10.1126/science.aah5281] [Citation(s) in RCA: 614] [Impact Index Per Article: 87.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 02/07/2017] [Accepted: 03/08/2017] [Indexed: 01/19/2023]
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12
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Davies GHM, Molander GA. Synthesis of Functionalized 1,3,2-Benzodiazaborole Cores Using Bench-Stable Components. J Org Chem 2016; 81:3771-9. [PMID: 27070990 PMCID: PMC4862404 DOI: 10.1021/acs.joc.6b00435] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The azaborine motif provides a unique opportunity to develop core isosteres by inserting B-N units in place of C═C bonds within aromatic scaffolds, creating new pseudoaromatic building blocks that retain comparable structural features. Previous synthetic routes to the 1,3,2-benzodiazaborole core have used organoboron dichlorides and boronic acids as the boron precursors. The transformation developed herein utilizes entirely bench stable starting materials, including organotrifluoroborates, enabling a wider array of substrate analogues under facile reaction conditions. Furthermore, physical, structural, and electronic properties of these compounds were explored computationally to understand the influence of the B-N replacement on the structure, aromaticity, and isosteric viability of these analogues.
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Affiliation(s)
- Geraint H M Davies
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
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