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Kemper M, Engelage E, Merten C. Chirale molekulare Propeller basierend auf Triarylboran‐Ammoniak‐Addukten. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Michael Kemper
- Ruhr Universität Bochum Fakultät für Chemie und Biochemie, Organische Chemie II Universitätsstraße 150 44801 Bochum Deutschland
| | - Elric Engelage
- Ruhr Universität Bochum Fakultät für Chemie und Biochemie, Organische Chemie II Universitätsstraße 150 44801 Bochum Deutschland
| | - Christian Merten
- Ruhr Universität Bochum Fakultät für Chemie und Biochemie, Organische Chemie II Universitätsstraße 150 44801 Bochum Deutschland
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2
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Kemper M, Engelage E, Merten C. Chiral Molecular Propellers of Triarylborane Ammonia Adducts. Angew Chem Int Ed Engl 2021; 60:2958-2962. [PMID: 33197119 PMCID: PMC7898383 DOI: 10.1002/anie.202014130] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Indexed: 11/19/2022]
Abstract
Chiral molecular propeller conformations have been induced to various triaryl structures including trityl derivatives and triaryl boranes. For borane-amine adducts, such induced propeller chirality has not been reported yet due to the low energy barrier for racemization in common triarylboranes such as B(C6 H5 )3 or B(C6 F5 )3 . Herein, we demonstrate that point chirality in side chains of chiral triarylborane-ammonia adducts, which feature intramolecular hydrogen bonds in addition to the dative N→B bond, can efficiently be transferred to triarylborane propeller chirality. Employing X-ray crystallography and ECD/VCD spectroscopy for structural characterizations, we investigate three examples with different steric demands of the incorporated chiral alkoxy side groups. We elucidate the conformational preferences of the molecular propellers. Furthermore, we show that computationally predicted conformational preferences obtained for the isolated, only implicitly solvated molecules are actually opposite to the experimentally observed ones.
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Affiliation(s)
- Michael Kemper
- Ruhr Universität BochumFakultät für Chemie und Biochemie, Organische Chemie IIUniversitätsstrasse 15044801BochumGermany
| | - Elric Engelage
- Ruhr Universität BochumFakultät für Chemie und Biochemie, Organische Chemie IIUniversitätsstrasse 15044801BochumGermany
| | - Christian Merten
- Ruhr Universität BochumFakultät für Chemie und Biochemie, Organische Chemie IIUniversitätsstrasse 15044801BochumGermany
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Grajewski J, Mądry T, Kwit M, Warżajtis B, Rychlewska U, Gawroński J. Benzhydryl Ethers of Tartaric Acid Derivatives: Stereochemical Response of a Dynamically Chiral Propeller. Chemphyschem 2017; 18:2197-2207. [PMID: 28544199 DOI: 10.1002/cphc.201700332] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 05/22/2017] [Indexed: 11/09/2022]
Abstract
The benzhydryl (diphenylmethyl) group is a molecular propeller that can act as a chirality reporter if it is introduced nearby a stereogenic center by making an ether bond. The hydrophobic character of the benzhydryl group allows transformation of insoluble natural tartaric acid derivatives into soluble entities in a nonpolar environment. Electronic circular dichroism spectra, recorded within the short-wavelength region of the phenyl 1 B transitions (190-200 nm) shows strong bisignate Cotton effects. The signs and magnitudes of these Cotton effects are a function of absolute configuration and conformation of the molecule and do not primarily arise from exciton coupling of chiral benzhydryl chromophores. In crystals, the main-chain conformation is stabilized by intramolecular hydrogen bonds and CH-CO dipolar interactions. The number of the donor NH groups has a pronounced effect on the preferred conformations and inclusion properties of benzhydryl-(R,R)-tartaric acid diamides. Evidence is shown for the solvent dependency of the conformations of NH amides of tartaric acid diphenylmethyl ethers.
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Affiliation(s)
- Jakub Grajewski
- Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614, Poznań, Poland
| | - Tomasz Mądry
- Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614, Poznań, Poland
| | - Marcin Kwit
- Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614, Poznań, Poland
| | - Beata Warżajtis
- Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614, Poznań, Poland
| | - Urszula Rychlewska
- Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614, Poznań, Poland
| | - Jacek Gawroński
- Department of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614, Poznań, Poland
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4
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Thanzeel FY, Wolf C. Substrate‐Specific Amino Acid Sensing Using a Molecular
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‐Cysteine Probe for Comprehensive Stereochemical Analysis in Aqueous Solution. Angew Chem Int Ed Engl 2017; 56:7276-7281. [DOI: 10.1002/anie.201701188] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 03/10/2017] [Indexed: 01/07/2023]
Affiliation(s)
- F. Yushra Thanzeel
- Department of Chemistry Georgetown University 37th and O Streets Washington DC 20057 USA
| | - Christian Wolf
- Department of Chemistry Georgetown University 37th and O Streets Washington DC 20057 USA
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Thanzeel FY, Wolf C. Substratspezifische Analyse von Aminosäuren mit Sensoren für
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l
‐Cystein: umfassende stereochemische Untersuchungen in wässriger Lösung. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701188] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- F. Yushra Thanzeel
- Department of Chemistry Georgetown University 37th and O Streets Washington DC 20057 USA
| | - Christian Wolf
- Department of Chemistry Georgetown University 37th and O Streets Washington DC 20057 USA
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Chen L, Yu S, Xiao M, Huang Z, Wen K, Xu Y, Zhao F, Yu X, Pu L. Recognition of Chiral Amines by a Terpyridine–Zn
II
‐Complex‐Based Circular‐Dichroism Sensor. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700066] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Liming Chen
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Shanshan Yu
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Meng Xiao
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Zeng Huang
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Kaili Wen
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Yimang Xu
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Feng Zhao
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Xiaoqi Yu
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
| | - Lin Pu
- Key Laboratory of Green Chemistry and Technology Ministry of Education, College of Chemistry Sichuan University 610064 Chengdu China
- Department of Chemistry University of Virginia 22904 Charlottesville Virginia USA
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Xiao M, Yu S, Chen L, Huang Z, Wen K, Xu Y, Zhao F, Yu X, Pu L. Fluorous‐Phase‐Based Chiral Assay with Circular Dichroism Spectroscopy. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601643] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Meng Xiao
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Shanshan Yu
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Liming Chen
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Zeng Huang
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Kaili Wen
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Yimang Xu
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Feng Zhao
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Xiaoqi Yu
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
| | - Lin Pu
- Key Laboratory of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University 610064 Chengdu China
- Department of Chemistry University of Virginia McCormick Rd 22904 Charlottesville VA USA
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Serda M, Wu YK, Barth ED, Halpern HJ, Rawal VH. EPR Imaging Spin Probe Trityl Radical OX063: A Method for Its Isolation from Animal Effluent, Redox Chemistry of Its Quinone Methide Oxidation Product, and in Vivo Application in a Mouse. Chem Res Toxicol 2016; 29:2153-2156. [PMID: 27989135 DOI: 10.1021/acs.chemrestox.6b00277] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We report herein a method for the recovery, purification, and application of OX063, a costly, commercially available nontoxic spin probe widely used for electron paramagnetic resonance (EPR) imaging, as well as its corresponding quinone methide (QM) form. This precious probe can be successfully recovered after use in animal model experiments (25-47% recovery from crude lyophilizate with 98.5% purity), even from samples that are >2 years old. Significantly, the recovered trityl can be reused in further animal model EPR imaging experiments. The work also describes support for the observed formation of an air-sensitive radical derived from the QM under reducing conditions.
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Affiliation(s)
- Maciej Serda
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Yen-Ku Wu
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Eugene D Barth
- The Center for EPR Imaging In Vivo Physiology, Department of Radiation and Cellular Oncology, University of Chicago , 5841 South Maryland Avenue, Chicago, Illinois 60637, United States
| | - Howard J Halpern
- The Center for EPR Imaging In Vivo Physiology, Department of Radiation and Cellular Oncology, University of Chicago , 5841 South Maryland Avenue, Chicago, Illinois 60637, United States
| | - Viresh H Rawal
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
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Ściebura J, Janiak A, Stasiowska A, Grajewski J, Gawrońska K, Rychlewska U, Gawroński J. Intramolecular interactions of trityl groups. Chemphyschem 2014; 15:1653-9. [PMID: 24692363 DOI: 10.1002/cphc.201301204] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 02/26/2014] [Indexed: 11/11/2022]
Abstract
Trityl group, Tr, is a molecular dynamic rotor of which the conformation and helicity depend on other groups in the close vicinity. Interactions with another covalently linked Tr group and with other substituents are analyzed in terms of transfer of chirality to the trityl group. Two trityl groups in a molecule can mutually interact at a distance of two, three, or five bonds. Despite its size, a Tr group attached to a cyclohexane or cyclopentane ring through an oxygen or nitrogen atom adopts either an axial or equatorial position, depending on additional stabilizing interactions, such as hydrogen bonding.
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Affiliation(s)
- Jacek Ściebura
- Department of Chemistry, Adam Mickiewicz University, 60-780 Poznan (Poland), Fax: (+48) 61829-1555
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Gajewy J, Gawronski J, Kwit M. Mechanism and Enantioselectivity of [Zinc(diamine)(diol)]-Catalyzed Asymmetric Hydrosilylation of Ketones: DFT, NMR and ECD Studies. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200992] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Tormyshev VM, Genaev AM, Sal'nikov GE, Rogozhnikova OY, Troitskaya TI, Trukhin DV, Mamatyuk VI, Fadeev DS, Halpern HJ. Triarylmethanols bearing bulky aryl groups and the NOESY/EXSY experimental observation of two-ring-flip mechanism for helicity reversal of molecular propellers. European J Org Chem 2011; 2012. [PMID: 24294110 DOI: 10.1002/ejoc.201101243] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Triarylmethanols - the direct precursors of persistent trityl radicals - are racemic mixtures of chiral three-bladed molecular propellers. Depending on bulkiness of aryl groups they exhibit various liabilities to interconversion, the half- life time of room temperature racemization varying in a range between 8.4 hours and 1.32 years. NOESY/EXSY experiment performed on two representative models strongly supports the two-ring flip mechanism for the configurational interchange.
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Affiliation(s)
- Victor M Tormyshev
- Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9 Acad. M.A. Lavrentjev Ave., Novosibirsk 630090, Russia ; Department of Natural Sciences, Novosibirsk State University, 2 Pirogov St., Novosibirsk 630090, Russia
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Ściebura J, Gawroński J. Double Chirality Transmission in Trityl Amines: Sensing Molecular Dynamic Stereochemistry by Circular Dichroism and DFT Calculations. Chemistry 2011; 17:13138-41. [DOI: 10.1002/chem.201101699] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Indexed: 11/09/2022]
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Gao G, Bai XF, Yang HM, Jiang JX, Lai GQ, Xu LW. Ar-BINMOLs with Axial and sp3 Central Chirality - Characterization, Chiroptical Properties, and Application in Asymmetric Catalysis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100664] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Shen H, Yang KF, Shi ZH, Jiang JX, Lai GQ, Xu LW. Recyclable Tertiary Amine Modified Diarylprolinol Ether as Aminocatalyst for the Sequential Asymmetric Synthesis of Functionalized Cyclohexanes and Chromenes. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100613] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Alkorta I, Elguero J. A theoretical analysis of the conformational space of tris(2-methylbenzimidazol-1-yl)methane. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.02.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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