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Batabyal M, Upadhyay A, Kadu R, Birudukota NC, Chopra D, Kumar S. Tetravalent Spiroselenurane Catalysts: Intramolecular Se···N Chalcogen Bond-Driven Catalytic Disproportionation of H 2O 2 to H 2O and O 2 and Activation of I 2 and NBS. Inorg Chem 2022; 61:8729-8745. [PMID: 35638247 DOI: 10.1021/acs.inorgchem.2c00651] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chalcogen-bonding interactions have recently gained considerable attention in the field of synthetic chemistry, structure, and bonding. Here, three organo-spiroselenuranes, having a Se(IV) center with a strong intramolecular Se···N chalcogen-bonded interaction, have been isolated by the oxidation of the respective bis(2-benzamide) selenides derived from an 8-aminoquinoline ligand. Further, the synthesized spiroselenuranes, when assayed for their antioxidant activity, show disproportionation of hydrogen peroxide into H2O and O2 with first-order kinetics with respect to H2O2 for the first time by any organoselenium molecules as monitored by 1H NMR spectroscopy. Electron-donating 5-methylthio-benzamide ring-substituted spiroselenurane disproportionates hydrogen peroxide at a high rate of 15.6 ± 0.4 × 103 μM min-1 with a rate constant of 8.57 ± 0.50 × 10-3 s-1, whereas 5-methoxy and unsubstituted-benzamide spiroselenuranes catalyzed the disproportionation of H2O2 at rates of 7.9 ± 0.3 × 103 and 2.9 ± 0.3 × 103 μM min-1 with rate constants of 1.16 ± 0.02 × 10-3 and 0.325 ± 0.025 × 10-3 s-1, respectively. The evolved oxygen gas from the spiroselenurane-catalyzed disproportion of H2O2 has also been confirmed by a gas chromatograph-thermal conductivity detector (GCTCD) and a portable digital polarographic dissolved O2 probe. Additionally, the synthesized spiroselenuranes exhibit thiol peroxidase antioxidant activities for the reduction of H2O2 by a benzenethiol co-reductant monitored by UV-visible spectroscopy. Next, the Se···N bonded spiroselenuranes have been explored as catalysts in synthetic oxidation iodolactonization and bromination of arenes. The synthesized spiroselenurane has activated I2 toward the iodolactonization of alkenoic acids under base-free conditions. Similarly, efficient chemo- and regioselective monobromination of various arenes with NBS catalyzed by chalcogen-bonded synthesized spiroselenuranes has been achieved. Mechanistic insight into the spiroselenuranes in oxidation reactions has been gained by 77Se NMR, mass spectrometry, UV-visible spectroscopy, single-crystal X-ray structure, and theoretical (DFT, NBO, and AIM) studies. It seems that the highly electrophilic nature of the selenium center is attributed to the presence of an intramolecular Se···N interaction and a vacant coordination site in spiroselenuranes is crucial for the activation of H2O2, I2, and NBS. The reaction of H2O2, I2, and NBS with tetravalent spiroselenurane would lead to an octahedral-Se(VI) intermediate, which is reduced back to Se(IV) due to thermodynamic instability of selenium in its highest oxidation state and the presence of a strong intramolecular N-donor atom.
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Affiliation(s)
- Monojit Batabyal
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Aditya Upadhyay
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Rahul Kadu
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India.,MIT School of Engineering, MIT Art, Design and Technology University Pune, Loni Kalbhor, Maharashtra 412201, India
| | - Nihal Chaitanya Birudukota
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
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Lamani DS, Badiger SG, Singh M. Formation of diaryl sulfides and sulfoxides: Synthesis, characterization and structure activity correlation studies. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2018.1547720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Devappa S. Lamani
- Department of Chemistry, Basaveshawar Science College, Bagalkot. Rani Channamma University, Belagavi, Karnataka, India
| | - Srikant G. Badiger
- Department of Chemistry, Basaveshawar Science College, Bagalkot. Rani Channamma University, Belagavi, Karnataka, India
| | - Mamata Singh
- Department of Chemistry, Gandhi Institute of Technology and Management University (GITAM), Bangalore, Karnataka, India
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Sands KN, Tuck TA, Back TG. Cyclic Seleninate Esters, Spirodioxyselenuranes and Related Compounds: New Classes of Biological Antioxidants That Emulate Glutathione Peroxidase. Chemistry 2018. [DOI: 10.1002/chem.201800182] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kai N. Sands
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Tyler A. Tuck
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Thomas G. Back
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
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4
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Pitrat D, Daugey N, Jean M, Vanthuyne N, Wien F, Ducasse L, Calin N, Buffeteau T, Brotin T. Unusual Chiroptical Properties of the Cryptophane-222 Skeleton. J Phys Chem B 2016; 120:12650-12659. [DOI: 10.1021/acs.jpcb.6b09771] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Delphine Pitrat
- Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Laboratoire de Chimie, Lyon 1 University, 69364 Lyon, France
| | - Nicolas Daugey
- Institut des Sciences Moléculaires, CNRS UMR 5255, Bordeaux University, 33405 Talence, France
| | - Marion Jean
- Centrale Marseille, CNRS, iSm2, Aix-Marseille University, 13397 Marseille, France
| | - Nicolas Vanthuyne
- Centrale Marseille, CNRS, iSm2, Aix-Marseille University, 13397 Marseille, France
| | - Frank Wien
- Synchrotron SOLEIL, L’Orme
des Merisiers, 91192 Gif sur Yvette, France
| | - Laurent Ducasse
- Institut des Sciences Moléculaires, CNRS UMR 5255, Bordeaux University, 33405 Talence, France
| | - Nathalie Calin
- Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Laboratoire de Chimie, Lyon 1 University, 69364 Lyon, France
| | - Thierry Buffeteau
- Institut des Sciences Moléculaires, CNRS UMR 5255, Bordeaux University, 33405 Talence, France
| | - Thierry Brotin
- Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Laboratoire de Chimie, Lyon 1 University, 69364 Lyon, France
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Cmoch P, Głaszczka R, Jaźwiński J, Kamieński B, Senkara E. Adducts of nitrogenous ligands with rhodium(II) tetracarboxylates and tetraformamidinate: NMR spectroscopy and density functional theory calculations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2014; 52:61-68. [PMID: 24327228 DOI: 10.1002/mrc.4035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 09/29/2013] [Accepted: 11/04/2013] [Indexed: 06/03/2023]
Abstract
Complexation of tetrakis(μ2-N,N'-diphenylformamidinato-N,N')-di-rhodium(II) with ligands containing nitrile, isonitrile, amine, hydroxyl, sulfhydryl, isocyanate, and isothiocyanate functional groups has been studied in liquid and solid phases using (1)H, (13)C and (15)N NMR, (13)C and (15)N cross polarisation-magic angle spinning NMR, and absorption spectroscopy in the visible range. The complexation was monitored using various NMR physicochemical parameters, such as chemical shifts, longitudinal relaxation times T1 , and NOE enhancements. Rhodium(II) tetraformamidinate selectively bonded only unbranched amine (propan-1-amine), pentanenitrile, and (1-isocyanoethyl)benzene. No complexation occurred in the case of ligands having hydroxyl, sulfhydryl, isocyanate, and isothiocyanate functional groups, and more expanded amine molecules such as butan-2-amine and 1-azabicyclo[2.2.2]octane. Such features were opposite to those observed in rhodium(II) tetracarboxylates, forming adducts with all kind of ligands. Special attention was focused on the analysis of Δδ parameters, defined as a chemical shift difference between signal in adduct and corresponding signal in free ligand. In the case of (1)H NMR, Δδ values were either negative in adducts of rhodium(II) tetraformamidinate or positive in adducts of rhodium(II) tetracarboxylates. Experimental findings were supported by density functional theory molecular modelling and gauge independent atomic orbitals chemical shift calculations. The calculation of chemical shifts combined with scaling procedure allowed to reproduce qualitatively Δδ parameters.
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Affiliation(s)
- Piotr Cmoch
- Institute of Organic Chemistry PAS, ul. Kasprzaka 44/52, 01-224, Warsaw, Poland
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Scafato P, Caprioli F, Pisani L, Padula D, Santoro F, Mazzeo G, Abbate S, Lebon F, Longhi G. Combined use of three forms of chiroptical spectroscopies in the study of the absolute configuration and conformational properties of 3-phenylcyclopentanone, 3-phenylcyclohexanone, and 3-phenylcycloheptanone. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.10.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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7
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Jaźwiński J, Sadlej A. Complexation of rhodium(II) tetracarboxylates with aliphatic diamines in solution: 1H and 13C NMR and DFT investigations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:662-670. [PMID: 23943201 DOI: 10.1002/mrc.3997] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 07/15/2013] [Accepted: 07/15/2013] [Indexed: 06/02/2023]
Abstract
The complexation of rhodium(II) tetraacetate, tetrakistrifluoroaceate and tetrakisoctanoate with a set of diamines (ethane-1,diamine, propane-1,3-diamine and nonane-1,9-diamine) and their N,N'-dimethyl and N,N,N',N'-tetramethyl derivatives in chloroform solution has been investigated by (1) H and (13) C NMR spectroscopy and density functional theory (DFT) modelling. A combination of two bifunctional reagents, diamines and rhodium(II) tetracarboxylates, yielded insoluble coordination polymers as main products of complexation and various adducts in the solution, being in equilibrium with insoluble material. All diamines initially formed the 2 : 1 (blue), (1 : 1)n oligomeric (red) and 1 : 2 (red) axial adducts in solution, depending on the reagents' molar ratio. Adducts of primary and secondary diamines decomposed in the presence of ligand excess, the former via unstable equatorial complexes. The complexation of secondary diamines slowed down the inversion at nitrogen atoms in NH(CH3 ) functional groups and resulted in the formation of nitrogenous stereogenic centres, detectable by NMR. Axial adducts of tertiary diamines appeared to be relatively stable. The presence of long aliphatic chains in molecules (adducts of nonane-1,9-diamines or rhodium(II) tetrakisoctanoate) increased adduct solubility. Hypothetical structures of the equatorial adduct of rhodium(II) tetraacetate with ethane-1,2-diamine and their NMR parameters were explored by means of DFT calculations.
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Affiliation(s)
- Jarosław Jaźwiński
- Institute of Organic Chemistry PAS, ul. Kasprzaka 44/52, 01-224, Warsaw, Poland
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8
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Press DJ, McNeil NMR, Rauk A, Back TG. NMR and Computational Studies of the Configurational Properties of Spirodioxyselenuranes. Are Dynamic Exchange Processes or Temperature-Dependent Chemical Shifts Involved? J Org Chem 2012; 77:9268-76. [DOI: 10.1021/jo301846a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- David J. Press
- Department
of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Nicole M. R. McNeil
- Department
of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Arvi Rauk
- Department
of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Thomas G. Back
- Department
of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
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Duddeck H, Tóth G, Simon A, Gómez ED, Mattiza JT. Adamantanes as spherical nanosondes in adducts with a chiral dirhodium complex-discriminating enantiomers and probing spatial proximities. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2011; 49:328-342. [PMID: 21452345 DOI: 10.1002/mrc.2751] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Accepted: 02/10/2011] [Indexed: 05/30/2023]
Abstract
Three different kinds of substituted chiral adamantane molecules-adamantanones, dioxolanoadamantanes and dithiolano-adamantanes-were studied in the dirhodium experiment (NMR measurement with 1:1 molar mixtures with Rh((II))(2)[(R)-(+)-MTPA](4) in CDCl(3)). Their different behavior in adduct formation is described, and the possibility of determining enantiomeric purities and absolute configurations is explored. Detailed inspection of one- and two-dimensional NMR experiments allowed for an interpretation of steric and electronic intra-adduct interaction showing that the phenyl groups of Rh* tend to enwrap the bound adamantane ligand so that through-space effects over a range of 6-7 Å away from the binding rhodium atom can be observed. Even slight differences in the relative orientation of phenyl groups can be monitored when comparing diastereomeric adducts via NMR signal dispersion.
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Affiliation(s)
- Helmut Duddeck
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, D-30167 Hannover, Germany.
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10
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He XF, Zhang S, Zhu RX, Yang SP, Yuan T, Yue JM. Sarcanolides A and B: two sesquiterpenoid dimers with a nonacyclic scaffold from Sarcandra hainanensis. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.03.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Jiang N, Tan RX, Ma J. Simulations of Solid-State Vibrational Circular Dichroism Spectroscopy of (S)-Alternarlactam by Using Fragmentation Quantum Chemical Calculations. J Phys Chem B 2011; 115:2801-13. [DOI: 10.1021/jp110152q] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nan Jiang
- School of Chemistry and Chemical Engineering, Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, Nanjing University, Nanjing, Jiangsu, 210093, People’s Republic of China
| | - Ren Xiang Tan
- Institute of Functional Biomolecules, State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, People’s Republic of China
| | - Jing Ma
- School of Chemistry and Chemical Engineering, Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, Nanjing University, Nanjing, Jiangsu, 210093, People’s Republic of China
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12
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Selvakumar K, Singh HB, Goel N, Singh UP, Butcher RJ. Synthesis and structural characterization of pincer type bicyclic diacyloxy- and diazaselenuranes. Dalton Trans 2011; 40:9858-67. [DOI: 10.1039/c1dt10862j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Mattiza JT, Fohrer JGG, Duddeck H, Gardiner MG, Ghanem A. Optimizing dirhodium(ii) tetrakiscarboxylates as chiral NMR auxiliaries. Org Biomol Chem 2011; 9:6542-50. [PMID: 21808807 DOI: 10.1039/c1ob05665d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Jens T Mattiza
- Leibniz University Hannover, Institute of Organic Chemistry, Schneiderberg 1B, D-30167, Hannover, Germany
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14
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Mattiza JT, Meyer VJ, Duddeck H. Stereoisomeric 2-butylphenylsulfoxides and their binding modes in the adduct formation with an enantiopure dirhodium tetracarboxylate complex. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.01.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Autschbach J, Nitsch-Velasquez L, Rudolph M. Time-dependent density functional response theory for electronic chiroptical properties of chiral molecules. Top Curr Chem (Cham) 2010; 298:1-98. [PMID: 21321799 DOI: 10.1007/128_2010_72] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Methodology to calculate electronic chiroptical properties from time-dependent density functional theory (TDDFT) is outlined. Applications of TDDFT to computations of electronic circular dichroism, optical rotation, and optical rotatory dispersion are reviewed. Emphasis is put on publications from 2005 to 2010, but much of the older literature is also cited and discussed. The determination of the absolute configuration of chiral molecules by combined measurements and computations is an important application of TDDFT chiroptical methods and discussed in some detail. Raman optical activity (ROA) spectra are obtained from normal-mode derivatives of the optical rotation tensor and other linear response tensors. A few selected (ROA) benchmarks are reviewed.
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Affiliation(s)
- Jochen Autschbach
- Department of Chemistry, University at Buffalo State University of New York, New York, NY, USA.
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Gómez ED, Duddeck H. A new method proposed for the determination of absolute configurations of alpha-amino acids. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2009; 47:222-227. [PMID: 19072975 DOI: 10.1002/mrc.2374] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Enantiopure alpha-amino acids were converted to 4-substituted 2-aryl- and 2-alkyl-5(4H)-oxazolones under partial racemization. These nonracemic mixtures were dissolved in CDCl(3), an equimolar amount of the chiral dirhodium complex Rh(II)(2)[(R)-(+)-MTPA](4) (MTPA-H = Mosher's acid) was added, and the (1)H NMR spectra of the resulting samples were recorded (dirhodium method). The relative intensities of (1)H signals dispersed by the formation of diastereomeric adducts allow to determine the absolute configuration (AC) of the starting alpha-amino acids. Binding atoms in the adducts were identified by comparing the (1)H and (13)C chemical shifts of the oxazolones in the absence and presence of Rh(II)(2)[(R)-(+)-MTPA](4). Thereby, information about the scope and limits of this method can be extracted. A protocol how to use this method is presented.
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Affiliation(s)
- Edison Díaz Gómez
- Leibniz University Hannover, Institute of Organic Chemistry, Schneiderberg 1B, D-30167 Hannover, Germany.
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Mazzeo G, Giorgio E, Rosini C, Fabris F, Fregonese E, Toniolo U, De Lucchi O. Synthesis, chiroptical properties, and their theoretical simulation of some highly rotating benzotricamphor derivatives. Chirality 2009; 21 Suppl 1:E86-97. [DOI: 10.1002/chir.20780] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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18
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Tartaglia S, Padula D, Scafato P, Chiummiento L, Rosini C. A Chemical/Computational Approach to the Determination of Absolute Configuration of Flexible and Transparent Molecules: Aliphatic Diols As a Case Study. J Org Chem 2008; 73:4865-73. [DOI: 10.1021/jo800516f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sabina Tartaglia
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via N. Sauro, 85, 85100 Potenza, Italy
| | - Daniele Padula
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via N. Sauro, 85, 85100 Potenza, Italy
| | - Patrizia Scafato
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via N. Sauro, 85, 85100 Potenza, Italy
| | - Lucia Chiummiento
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via N. Sauro, 85, 85100 Potenza, Italy
| | - Carlo Rosini
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via N. Sauro, 85, 85100 Potenza, Italy
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Gómez ED, Doğan I, Yilmaz M, Demir-Ordu O, Albert D, Duddeck H. Atropisomeric 3-aryl-2-oxo-4-oxazolidinones and some thione analogues—Enantiodifferentiation and ligand competition in applying the dirhodium method. Chirality 2008; 20:344-50. [PMID: 17663406 DOI: 10.1002/chir.20446] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The atropisomeric 2-oxo-4-oxazolidinones 1Z bind weakly to the rhodium atoms in the complex Rh(II)2 [(R)-(+)-MTPA]4 (Rh*, MTPA-H = methoxytrifluoromethylphenylacetic acid identical with Mosher's acid), presumably via the C-2 carbonyl oxygen atom. There are some 1H and 13C NMR signals in these compounds which show small dispersion effects suitable for enantiodifferentiation. In contrast, the thiocarbonyl sulfur atoms in 2Z and 3Z bind strongly so that significant complexation shifts (Delta delta) and diastereomeric dispersion effects (Delta nu) can be observed, and chiral discrimination and the determination of enantiomeric ratios of these thiocarbonyl compounds is easy. So, it is shown that--as expected--C=S is a much better binding site when competing with C=O. In compounds of Series 2 a "syn-methyl effect" was discovered which describes the dependence of dispersion effects of syn-oriented methyl groups 6 on the nature of the substituents Z. A mechanism of combined steric and electronic interaction influencing the conformational equilibria inside the adducts is proposed. Determination of absolute configurations by correlation fails, at least on the basis of the data available.
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Affiliation(s)
- Edison Díaz Gómez
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg, Hannover, Germany
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20
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Allenmark S. Recent advances in spirochalcogenurane stereochemistry—A mini review. Chirality 2008; 20:544-51. [DOI: 10.1002/chir.20510] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Freedman TB, Cao X, Luz Z, Zimmermann H, Poupko R, Nafie LA. Isotopic difference spectra as an aide in determining absolute configuration using vibrational optical activity: Vibrational circular dichroism of13C- and2H-labelled nonamethoxy cyclotriveratrylene. Chirality 2008; 20:673-80. [DOI: 10.1002/chir.20514] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Giorgio E, Tanaka K, Verotta L, Nakanishi K, Berova N, Rosini C. Determination of the absolute configurations of flexible molecules: synthesis and theoretical simulation of electronic circular dichroism/optical rotation of some pyrrolo[2,3-b]indoline alkaloids--a case study. Chirality 2007; 19:434-45. [PMID: 17393468 DOI: 10.1002/chir.20395] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The paper describes the synthesis and chiroptical properties of (-)-1,2,3,3a,8,8a,-hexahydro-1,3a-dimethyl-pyrrolo[2,3-b]indole, (-)-1, one of the monomeric units of many flexible polypyrroloindoline alkaloids and (-)-chimonanthine, (-)-2. The aim of this investigation is to show that, under certain circumstances, namely, with molecules for which the sign and order of magnitude of [alpha](D) are determined by the lowest-energy valence-shell transitions (referred to as class (a) molecules), a small basis set calculation of chiroptical properties provides reliable results, and that such a treatment can be employed for absolute configurational assignment of larger oligomers, for which the increased flexibility renders the analysis as formidable task. Actually, as the aforementioned two molecules belong to class (a) systems, a TDDFT/B3LYP/6-31G* calculation of the ECD and ORD spectra gives rise to a more than satisfactory simulation of these data, assuming the reported absolute configurations. In other words, the use of the TDDFT/B3LYP method with the small 6-31G* basis set enables one to treat large and flexible molecules such as (-)-2 (52 atoms and 6 conformers) by usage of a simple PC in about 2 weeks. This protocol demonstrates that an ab initio prediction of ECD/ORD spectra results in reliable assignments of absolute configuration of even relatively large natural products, thus economizing computation time.
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Affiliation(s)
- Egidio Giorgio
- Dipartimento di Chimica, Università della Basilicata, 85100 Potenza, Italy
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Jiemchooroj A, Norman P. Electronic circular dichroism spectra from the complex polarization propagator. J Chem Phys 2007; 126:134102. [PMID: 17430011 DOI: 10.1063/1.2716660] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The complex linear polarization propagator approach has been applied to the calculation of electronic circular dichroism spectra of 3R-chloro-1-butyne, 3R-methylcyclopentanone, 3S-methylcyclohexanone, 4R-1,1-dimethyl-[3]-(1,2)ferrocenophan-2-on, S-3,3,3',3'-tetramethyl-1,1'-spirobi[3H,2,1]-benzoxaselenole, and the fullerene C84. Using time-dependent Kohn-Sham density functional theory, it is shown that a direct and efficient evaluation of the circular dichroism spectrum can be achieved. The approach allows for the determination of the circular dichroism at an arbitrary wavelength thereby, in a common formulation and implementation, covering the visible, ultraviolet, and x-ray regions of the spectrum. In contrast to traditional methods, the entire manifold of excited states is taken into account in the calculation of the circular dichroism at a given wavelength.
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Affiliation(s)
- Auayporn Jiemchooroj
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
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24
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Zhu HJ, Ren J, Pittman CU. Matrix model to predict specific optical rotations of acyclic chiral molecules. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.12.061] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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McConnell O, He Y, Nogle L, Sarkahian A. Application of chiral technology in a pharmaceutical company. Enantiomeric separation and spectroscopic studies of key asymmetric intermediates using a combination of techniques. Phenylglycidols. Chirality 2007; 19:716-30. [PMID: 17323324 DOI: 10.1002/chir.20368] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Phenylglycidols substituted in the 2-, 3-, and 4- positions with fluorine, chlorine, and trifluoromethyl, and with methoxy in the 3- position, were synthesized from the corresponding E-cinnamic acids and separated into their (R,R)- and (S,S)- enantiomers using subcritical fluid chromatography with mixtures of MeOH in CO(2), on either a Chiralpak AD or AS chiral stationary phase. These compounds and commercially-available (R,R)- and (S,S)-phenylglycidol were analyzed for their vibrational circular dichroism (VCD), electronic circular dichroism (ECD), and optical rotation (OR) properties to exemplify a strategy whereby the absolute stereochemistry of common and key chiral intermediates is established early in the structure-activity and structure-property relationship phase of a drug discovery program in a pharmaceutical company. From this study, substituents in the phenyl group of the synthesized molecules were found not to grossly alter spectroscopic features, and therefore, diagnostic absorption bands in the respective VCD spectra, and the sign and shape of the measured ECD curves could be used to determine and track the absolute stereochemistry of analogs without necessarily requiring time-consuming ab initio calculations of all low energy conformers for all compounds. VCD, OR, and ECD calculations for the determination of absolute configuration carried out at the DFT level with the hybrid B3PW91 functional and the TZVP basis set were found to be especially useful in this study.
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Affiliation(s)
- Oliver McConnell
- Wyeth Research, Chemical and Screening Sciences, Collegeville, PA 19426, USA.
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26
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Polavarapu PL. Renaissance in chiroptical spectroscopic methods for molecular structure determination. CHEM REC 2007; 7:125-36. [PMID: 17394174 DOI: 10.1002/tcr.20117] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Two of the chiroptical spectroscopic methods, namely optical rotatory dispersion (ORD) and electronic circular dichroism (ECD), have been around for several decades. But their use in determining the absolute configuration and predominant conformation is gaining renewed interest with the availability of quantum mechanical methods for predicting ORD and ECD. Two other methods, namely vibrational circular dichroism (VCD) and vibrational Raman optical activity (VROA), are relatively new and offer convenient approaches for deducing the structural information in chiral molecules. With the availability of quantum mechanical programs for predicting VCD and VROA, these methods have attracted numerous new researchers to this area. This review summarizes the latest developments in these four areas and provides examples where more than one method has been used to confirm the information obtained from individual methods.
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Affiliation(s)
- Prasad L Polavarapu
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA.
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27
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McConnell O, Bach A, Balibar C, Byrne N, Cai Y, Carter G, Chlenov M, Di L, Fan K, Goljer I, He Y, Herold D, Kagan M, Kerns E, Koehn F, Kraml C, Marathias V, Marquez B, McDonald L, Nogle L, Petucci C, Schlingmann G, Tawa G, Tischler M, Williamson RT, Sutherland A, Watts W, Young M, Zhang MY, Zhang Y, Zhou D, Ho D. Enantiomeric separation and determination of absolute stereochemistry of asymmetric molecules in drug discovery—Building chiral technology toolboxes. Chirality 2007; 19:658-82. [PMID: 17390370 DOI: 10.1002/chir.20399] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The application of Chiral Technology, or the (extensive) use of techniques or tools for the determination of absolute stereochemistry and the enantiomeric or chiral separation of racemic small molecule potential lead compounds, has been critical to successfully discovering and developing chiral drugs in the pharmaceutical industry. This has been due to the rapid increase over the past 10-15 years in potential drug candidates containing one or more asymmetric centers. Based on the experiences of one pharmaceutical company, a summary of the establishment of a Chiral Technology toolbox, including the implementation of known tools as well as the design, development, and implementation of new Chiral Technology tools, is provided.
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Affiliation(s)
- Oliver McConnell
- Wyeth Research, Chemical and Screening Sciences, Collegeville, PA 19426, USA.
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28
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Kuzma D, Parvez M, Back TG. Formation of a spirodiazaselenurane and its corresponding azaselenonium derivatives from the oxidation of 2,2′-selenobis(benzamide). Structure, properties and glutathione peroxidase activity. Org Biomol Chem 2007; 5:3213-7. [PMID: 17878981 DOI: 10.1039/b710685h] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidation of 2,2'-selenobis(benzamide) with N-chlorosuccinimide or hydrogen peroxide afforded the corresponding stable azaselenonium chloride and hydroxide, respectively. Both structures were characterized by spectroscopic and X-ray crystallographic methods. Each contains a covalent N-Se bond, as well as a noncovalent interaction between the selenium atom and the carbonyl oxygen atom of the other amide moiety. The treatment of the azaselenonium chloride with an excess of potassium hydride in DMSO-d(6) afforded the corresponding spirodiazaselenurane species, which proved hydrolytically unstable, but was characterized by NMR spectroscopy. The azaselenonium chloride displayed significant glutathione peroxidase-like catalytic activity in an assay with benzyl thiol and either hydrogen peroxide or tert-butyl hydroperoxide.
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Affiliation(s)
- Dusan Kuzma
- Department of Chemistry, University of Calgary, Calgary, AB, Canada
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Abstract
The availability of sophisticated quantum mechanical methods for predicting molecular optical rotations has revolutionized the determination of molecular stereochemistry. However, the objectives and approaches used for the applications of optical rotation vary from one laboratory to the other. With the number of applications of optical rotation increasing at an unprecedented rate, it is considered necessary to discuss the protocols for the general use of optical rotations predicted with quantum mechanical methods. A summary of the quantum mechanical methods for predicting optical rotations and protocols for the use of predicted optical rotations are presented in this article.
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