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Mamedov VA, Galimullina VR, Qu ZW, Zhu H, Syakaev VV, Shamsutdinova LR, Sergeev MA, Rizvanov IK, Gubaidullin AT, Sinyashin OG, Grimme S. AlCl 3-Promoted Intramolecular Indolinone-Quinolone Rearrangement of Spiro[indoline-3,2'-quinoxaline]-2,3'-diones: Easy Access to Quinolino[3,4- b]quinoxalin-6-ones. J Org Chem 2023. [PMID: 38151045 DOI: 10.1021/acs.joc.3c01906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
A facile and direct intramolecular indolinone-quinolone rearrangement was developed for the synthesis of quinolino[3,4-b]quinoxalin-6-ones from spiro[indoline-3,2'-quinoxaline]-2,3'-diones, which are readily available with use of isatines, malononitrile, and 1,2-phenylenediamines under quite mild conditions. This efficient approach provides excellent yields and could potentially be used for the construction of a diverse library of quinolino[3,4-b]quinoxalin-6-ones for high-throughput screening in medicinal chemistry. The reaction mechanism is explored by extensive DFT calculations.
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Affiliation(s)
- Vakhid A Mamedov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Venera R Galimullina
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Zheng-Wang Qu
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4, 53115 Bonn, Germany
| | - Hui Zhu
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4, 53115 Bonn, Germany
| | - Victor V Syakaev
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Leisan R Shamsutdinova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Mikhail A Sergeev
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Il'dar Kh Rizvanov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Aidar T Gubaidullin
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Oleg G Sinyashin
- A.E. Arbuzov Institute of Organic and Physical Chemistry, RFC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4, 53115 Bonn, Germany
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Singh SK, Mishra N, Kumar S, Jaiswal MK, Tiwari VK. Growing Impact of Carbohydrate‐Based Organocatalysts. ChemistrySelect 2022. [DOI: 10.1002/slct.202201314] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sumit K. Singh
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Nidhi Mishra
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Sunil Kumar
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Manoj K. Jaiswal
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Vinod K. Tiwari
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
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3
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El-Assaad TH, Zhu J, Sebastian A, McGrath DV, Neogi I, Parida KN. Dioxiranes: A Half-Century Journey. Org Chem Front 2022. [DOI: 10.1039/d2qo01005d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dioxiranes are multi-tasking reagents inheriting mild and selective oxygen transfer attributes. These oxidants are accessed from the reaction of ketones with an oxidant and are employed stoichiometrically or catalytically (in...
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4
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Matviitsuk A, Panger JL, Denmark SE. Katalytische enantioselektive Sulfenofunktionalisierung von Alkenen: Entwicklung und aktuelle Fortschritte. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005920] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anastassia Matviitsuk
- Roger Adams Laboratory Department of Chemistry University of Illinois Urbana Illinois 61801 USA
| | - Jesse L. Panger
- Roger Adams Laboratory Department of Chemistry University of Illinois Urbana Illinois 61801 USA
| | - Scott E. Denmark
- Roger Adams Laboratory Department of Chemistry University of Illinois Urbana Illinois 61801 USA
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5
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Matviitsuk A, Panger JL, Denmark SE. Catalytic, Enantioselective Sulfenofunctionalization of Alkenes: Development and Recent Advances. Angew Chem Int Ed Engl 2020; 59:19796-19819. [PMID: 32452077 PMCID: PMC7936392 DOI: 10.1002/anie.202005920] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Indexed: 12/13/2022]
Abstract
The last decade has witnessed a burgeoning of new methods for the enantioselective vicinal difunctionalization of alkenes initiated by electrophilic sulfenyl group transfer. The addition of sulfenium ions to alkenes results in the generation of chiral, non-racemic thiiranium ions. These highly reactive intermediates are susceptible to attack by a myriad of nucleophiles in a stereospecific ring-opening event to afford anti 1,2-sulfenofunctionalized products. The practical application of sulfenium ion transfer has been enabled by advances in the field of Lewis base catalysis. This Review will chronicle the initial discovery and characterization of thiiranium ion intermediates followed by the determination of their configurational stability and the challenges of developing enantioselective variants. Once the framework for the reactivity and stability of thiiranium ions has been established, a critical analysis of pioneering studies will be presented. Finally, a comprehensive discussion of modern synthetic applications will be categorized around the type of nucleophile employed for sulfenofunctionalization.
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Affiliation(s)
- Anastassia Matviitsuk
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois, 61801, USA
| | - Jesse L Panger
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois, 61801, USA
| | - Scott E Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois, 61801, USA
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6
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Stereoselectivity of the captodative alkenes 1-acetylvinyl arenecarboxylates in Diels-Alder reactions with cyclic dienes and stereospecific rearrangement of their bicyclo[2.2.n] α-ketol adducts. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2017.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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7
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Singh SK, La Jeunesse J, Zhu C, Kleimeier NF, Chen KH, Sun BJ, Chang AHH, Kaiser RI. Gas phase identification of the elusive oxaziridine (cyclo-H2CONH) – an optically active molecule. Chem Commun (Camb) 2020; 56:15643-15646. [DOI: 10.1039/d0cc06760a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
First detection of the chiral oxaziridine (cyclo-H2CONH) molecule.
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Affiliation(s)
- Santosh K. Singh
- Department of Chemistry
- University of Hawaii
- Honolulu
- USA
- W. M. Keck Research Laboratory in Astrochemistry
| | - Jesse La Jeunesse
- Department of Chemistry
- University of Hawaii
- Honolulu
- USA
- W. M. Keck Research Laboratory in Astrochemistry
| | - Cheng Zhu
- Department of Chemistry
- University of Hawaii
- Honolulu
- USA
- W. M. Keck Research Laboratory in Astrochemistry
| | - N. Fabian Kleimeier
- Department of Chemistry
- University of Hawaii
- Honolulu
- USA
- W. M. Keck Research Laboratory in Astrochemistry
| | - Kuo-Hsin Chen
- Department of Chemistry
- National Dong Hwa University
- Shoufeng
- Taiwan
| | - Bing-Jian Sun
- Department of Chemistry
- National Dong Hwa University
- Shoufeng
- Taiwan
| | | | - Ralf I. Kaiser
- Department of Chemistry
- University of Hawaii
- Honolulu
- USA
- W. M. Keck Research Laboratory in Astrochemistry
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8
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Paymode DJ, Ramana CV. Studies toward the Total Synthesis of Parvifolals A/B: An Intramolecular o-Quinone Methide [4 + 2]-Cycloaddition To Construct the Central Tetracyclic Core. ACS OMEGA 2019; 4:810-818. [PMID: 31459360 PMCID: PMC6648467 DOI: 10.1021/acsomega.8b02777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 12/26/2018] [Indexed: 06/10/2023]
Abstract
Two different approaches funded upon the intramolecular [4 + 2]-cycloaddition of in situ generated o-quinone methides have been explored to construct the central tetracyclic core of parvifolals A/B. At the outset, a cross-pinacol coupling of 2-formyl tri-O-methyl resveratrol with 4-methoxysalicylaldehyde followed by acid treatment was found to provide the desired tetracyclic core with an internal olefin. The requisite pendant aryl group has been introduced by a Pd-catalyzed direct coupling of corresponding diazonium salt.
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Affiliation(s)
- Dinesh J Paymode
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110 020, India
| | - Chepuri V Ramana
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110 020, India
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9
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Bulman Page PC, Almutairi SM, Chan Y, Stephenson GR, Gama Y, Goodyear RL, Douteau A, Allin SM, Jones GA. Asymmetric Oxidation of Enol Derivatives to α-Alkoxy Carbonyls Using Iminium Salt Catalysts: A Synthetic and Computational Study. J Org Chem 2019; 84:544-559. [PMID: 30548068 DOI: 10.1021/acs.joc.8b02354] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We report herein the first examples of asymmetric oxidation of enol ether and ester substrates using iminium salt organocatalysis, affording moderate to excellent enantioselectivities of up to 98% ee for tetralone-derived substrates in the α-hydroxyketone products. A comprehensive density functional theory study was undertaken to interpret the competing diastereoisomeric transition states in this example in order to identify the origins of enantioselectivity. The calculations, performed at the B3LYP/6-31G(D) level of theory, gave good agreement with the experimental results, in terms of the magnitude of the effects under the specified reaction conditions, and in terms of the preferential formation of the ( R)-enantiomer. Just one of the 30 characterized transition states dominates the enantioselectivity, which is attributed to the adoption of an orientation relative to stereochemical features of the chiral controlling element that combines a CH-π interaction between a CH2 group in the substrate and one of the aromatic rings of the biaryl section of the chiral auxiliary with a good alignment of the acetoxy group with the other biaryl ring, and places the smallest substituent on the alkene (a hydrogen atom) in the most sterically hindered position.
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Affiliation(s)
- Philip C Bulman Page
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Saud M Almutairi
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Yohan Chan
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - G Richard Stephenson
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Yannick Gama
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Ross L Goodyear
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Alice Douteau
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Steven M Allin
- Department of Chemistry and Forensics , Nottingham Trent University , Clifton , Nottingham NG11 8NS , U.K
| | - Garth A Jones
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
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10
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Qi L, Wang T, Wei Y, Tian H. Mechanism of Propylene Epoxidation via O2
with Co-Oxidation of Aldehydes by Metalloporphyrins. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801233] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lianshan Qi
- School of Chemical Engineering; East China University of Science and Technology; 200237 Shanghai China
| | - Tao Wang
- School of Chemical Engineering; East China University of Science and Technology; 200237 Shanghai China
| | - Yongmei Wei
- School of Chemical Engineering; East China University of Science and Technology; 200237 Shanghai China
| | - Hengshui Tian
- School of Chemical Engineering; East China University of Science and Technology; 200237 Shanghai China
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11
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Nelson DJ, Gichuhi WK, Nichols CM, Bierbaum VM, Lineberger WC, Lehman JH. Photoelectron spectroscopy and thermochemistry of o-, m-, and p-methylenephenoxide anions. Phys Chem Chem Phys 2018; 20:25203-25216. [PMID: 30255889 DOI: 10.1039/c8cp05403g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The anionic products following (H + H+) abstraction from o-, m-, and p-methylphenol (cresol) are investigated using flowing afterglow-selected ion flow tube (FA-SIFT) mass spectrometry and anion photoelectron spectroscopy (PES). The PES of the multiple anion isomers formed in this reaction are reported, including those for the most abundant isomers, o-, m- and p-methylenephenoxide distonic radical anions. The electron affinity (EA) of the ground triplet electronic state of neutral m-methylenephenoxyl diradical was measured to be 2.227 ± 0.008 eV. However, the ground singlet electronic states of o- and p-methylenephenoxyl were found to be significantly stabilized by their resonance forms as a substituted cyclohexadienone, resulting in measured EAs of 1.217 ± 0.012 and 1.096 ± 0.007 eV, respectively. Upon electron photodetachment, the resulting neutral molecules were shown to have Franck-Condon active ring distortion vibrational modes with measured frequencies of 570 ± 180 and 450 ± 80 cm-1 for the ortho and para isomers, respectively. Photodetachment to excited electronic states was also investigated for all isomers, where similar vibrational modes were found to be Franck-Condon active, and singlet-triplet splittings are reported. The thermochemistry of these molecules was investigated using FA-SIFT combined with the acid bracketing technique to yield values of 341.4 ± 4.3, 349.1 ± 3.0, and 341.4 ± 4.3 kcal mol-1 for the o-, m-, and p-methylenephenol radicals, respectively. Construction of a thermodynamic cycle allowed for an experimental determination of the bond dissociation energy of the O-H bond of m-methylenephenol radical to be 86 ± 4 kcal mol-1, while this bond is significantly weaker for the ortho and para isomers at 55 ± 5 and 52 ± 5 kcal mol-1, respectively. Additional EAs and vibrational frequencies are reported for several methylphenyloxyl diradical isomers, the negative ions of which are also formed by the reaction of cresol with O-.
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Affiliation(s)
- Daniel J Nelson
- JILA and the Department of Chemistry, University of Colorado, Boulder, CO 80309, USA.
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12
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Candu N, Paul D, Marcu IC, Parvulescu VI, Coman SM. Levulinate-intercalated LDH: A potential heterogeneous organocatalyst for the green epoxidation of α,β-unsaturated esters. Catal Today 2018. [DOI: 10.1016/j.cattod.2016.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Candu N, Paul D, Marcu IC, Tudorache M, Parvulescu VI, Coman SM. New organic-inorganic LDH composites: Synthesis, characterization and catalytic behavior in the green epoxidation of α, β-unsaturated esters. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.07.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Kolo AM, İpek E, Çapan İ, Servi S. Synthesis of Heterocyclic-Substituted Novel Hydroxysteroids with Regioselective and Stereoselective Reactions. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3070] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Emine İpek
- Department of Chemistry, Faculty of Science; Fırat University; Elazığ 23169 Turkey
| | - İrfan Çapan
- Department of Chemistry, Faculty of Science; Fırat University; Elazığ 23169 Turkey
| | - Süleyman Servi
- Department of Chemistry, Faculty of Science; Fırat University; Elazığ 23169 Turkey
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15
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Rokob TA. Pathways for Arene Oxidation in Non-Heme Diiron Enzymes: Lessons from Computational Studies on Benzoyl Coenzyme A Epoxidase. J Am Chem Soc 2016; 138:14623-14638. [PMID: 27682344 DOI: 10.1021/jacs.6b06987] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Oxygenation of aromatic rings using O2 is catalyzed by several non-heme carboxylate-bridged diiron enzymes. In order to provide a general mechanistic description for these reactions, computational studies were carried out at the ONIOM(B3LYP/BP86/Amber) level on the non-heme diiron enzyme benzoyl coenzyme A epoxidase, BoxB. The calculations revealed four possible pathways for attacking the aromatic ring: (a) electrophilic (2e-) attack by a bis(μ-oxo)-diiron(IV) species (Q pathway); (b) electrophilic (2e-) attack via the σ* orbital of a μ-η2:η2-peroxo-diiron(III) intermediate (Pσ* pathway); (c) radical (1e-) attack via the π*-orbital of a superoxo-diiron(II,III) species (Pπ* pathway); (d) radical (1e-) attack of a partially quenched bis(μ-oxo)-diiron(IV) intermediate (Q' pathway). The results allowed earlier work of de Visser on olefin epoxidation by diiron complexes and QM-cluster studies of Liao and Siegbahn on BoxB to be put into a broader perspective. Parallels with epoxidation using organic peracids were also examined. Specifically for the BoxB enzyme, the Q pathway was found to be the most preferred, but the corresponding bis(μ-oxo)-diiron(IV) species is significantly destabilized and not expected to be directly observable. Epoxidation via the Pσ* pathway represents an energetically somewhat higher lying alternative; possible strategies for experimental discrimination are discussed. The selectivity toward epoxidation is shown to stem from a combination of inherent electronic properties of the thioacyl substituent and enzymatic constraints. Possible implications of the results for toluene monooxygenases are considered as well.
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Affiliation(s)
- Tibor András Rokob
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences , Magyar Tudósok körútja 2, 1117 Budapest, Hungary
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16
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Mackenzie-Rae FA, Karton A, Saunders SM. Computational investigation into the gas-phase ozonolysis of the conjugated monoterpene α-phellandrene. Phys Chem Chem Phys 2016; 18:27991-28002. [PMID: 27711539 DOI: 10.1039/c6cp04695a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Reaction with ozone is a major atmospheric sink for α-phellandrene, a monoterpene found in both indoor and outdoor environments, however experimental literature concerning the reaction is scarce. In this study, high-level G4(MP2) quantum chemical calculations are used to theoretically characterise the reaction of ozone with both double bonds in α-phellandrene for the first time. Results show that addition of ozone to the least substituted double bond in the conjugated system is preferred. Following addition, thermal and chemically activated unimolecular reactions, including the so-called hydroperoxide and ester or 'hot' acid channels, and internal cyclisation reactions, are characterised to major first generation products. Conjugation present in α-phellandrene allows two favourable Criegee intermediate reaction pathways to proceed that have not previously been considered in the literature; namely a 1,6-allyl resonance stabilised hydrogen shift and intramolecular dioxirane isomerisation to an epoxide. These channels are expected to play an important role alongside conventional routes in the ozonolysis of a-phellandrene. Computational characterisation of the potential energy surface thus provides insight into this previously unstudied system, and will aid future mechanism development and experimental interpretation involving α-phellandrene and structurally similar species, to which the results are expected to extend.
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Affiliation(s)
- F A Mackenzie-Rae
- School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA 6009, Australia.
| | - A Karton
- School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA 6009, Australia.
| | - S M Saunders
- School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA 6009, Australia.
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Jiménez-Lozano P, Skobelev IY, Kholdeeva OA, Poblet JM, Carbó JJ. Alkene Epoxidation Catalyzed by Ti-Containing Polyoxometalates: Unprecedented β-Oxygen Transfer Mechanism. Inorg Chem 2016; 55:6080-4. [DOI: 10.1021/acs.inorgchem.6b00621] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pablo Jiménez-Lozano
- Department
de Química Física i Inorgànica, Universitat Rovira i Vigili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Igor Y. Skobelev
- Boreskov Institute of Catalysis, Prospekt Akademika Lavrentiev 5, Novosibirsk 630090, Russia
- Novosibirsk State University, Pirogova
Street 2, Novosibirsk 630090, Russia
| | - Oxana A. Kholdeeva
- Boreskov Institute of Catalysis, Prospekt Akademika Lavrentiev 5, Novosibirsk 630090, Russia
- Novosibirsk State University, Pirogova
Street 2, Novosibirsk 630090, Russia
| | - Josep M. Poblet
- Department
de Química Física i Inorgànica, Universitat Rovira i Vigili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Jorge J. Carbó
- Department
de Química Física i Inorgànica, Universitat Rovira i Vigili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain
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18
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Tandarić T, Vrček V, Šakić D. A quantum chemical study of HOCl-induced transformations of carbamazepine. Org Biomol Chem 2016; 14:10866-10874. [DOI: 10.1039/c6ob02166b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The computational chemistry approach in predicting products and recalcitrans in hypochlorous acid promoted carbamazepine degradation in the environment.
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Affiliation(s)
- Tana Tandarić
- Ruđer Bošković Institute
- Bijenička cesta 54
- 10000 Zagreb
- Croatia
| | - Valerije Vrček
- Faculty of Pharmacy and Biochemistry
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Davor Šakić
- Faculty of Pharmacy and Biochemistry
- University of Zagreb
- 10000 Zagreb
- Croatia
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Taghizadeh MT, Vatanparast M, Nasirianfar S. Oxaziridine (C-CH3NO), C-CH2NO Radicals and Cl, NH2 and Methyl Derivatives of Oxaziridine; Structures and Quantum Chemical Parameters. CHEMISTRY JOURNAL OF MOLDOVA 2015. [DOI: 10.19261/cjm.2015.10(2).10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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20
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Lo R, Ganguly B. Can hydroxylamine be a more potent nucleophile for the reactivation of tabun-inhibited AChE than prototype oxime drugs? An answer derived from quantum chemical and steered molecular dynamics studies. MOLECULAR BIOSYSTEMS 2015; 10:2368-83. [PMID: 24964273 DOI: 10.1039/c4mb00083h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Organophosphorus nerve agents are highly toxic compounds which strongly inhibit acetylcholinesterase (AChE) in the blood and in the central nervous system (CNS). Tabun is one of the highly toxic organophosphorus (OP) compounds and is resistant to many oxime drugs formulated for the reactivation of AChE. The reactivation mechanism of tabun-conjugated AChE with various drugs has been examined with density functional theory and ab initio quantum chemical calculations. The presence of a lone-pair located on the amidic group resists the nucleophilic attack at the phosphorus center of the tabun-conjugated AChE. We have shown that the newly designed drug candidate N-(pyridin-2-yl)hydroxylamine, at the MP2/6-31+G*//M05-2X/6-31G* level in the aqueous phase with the polarizable continuum solvation model (PCM), is more effective in reactivating the tabun-conjugated AChE than typical oxime drugs. The rate determining activation barrier with N-(pyridin-2-yl)hydroxylamine was found to be ∼1.7 kcal mol(-1), which is 7.2 kcal mol(-1) lower than the charged oxime trimedoxime (one of the most efficient reactivators in tabun poisonings). The greater nucleophilicity index (ω(-)) and higher CHelpG charge of pyridinylhydroxylamine compared to TMB4 support this observation. Furthermore, we have also examined the reactivation process of tabun-inhibited AChE with some other bis-quaternary oxime drug candidates such as methoxime (MMB4) and obidoxime. The docking analysis suggests that charged bis-quaternary pyridinium oximes have greater binding affinity inside the active-site gorge of AChE compared to the neutral pyridinylhydroxylamine. The peripheral ligand attached to the neutral pyridinylhydroxylamine enhanced the binding with the aromatic residues in the active-site gorge of AChE through effective π-π interactions. Steered molecular dynamics (SMD) simulations have also been performed with the charged oxime (TMB4) and the neutral hydroxylamine. From protein-drug interaction parameters (rupture force profiles, hydrogen bonds, hydrophobic interactions), geometry and the orientation of the drug candidates, the hydroxylamine is suggested to orchestrate the reactivation process better than TMB4. Furthermore, the calculated log P values show the effective penetration of the neutral drug candidate through the blood-brain barrier. The toxicity measurements and the IC50 values (a measure of the intrinsic affinity toward AChE) suggest that the pyridinylhydroxylamine compound could have similar toxic behavior compared to the prototype oxime antidotes used for reactivation purposes. The newly designed pyridinylhydroxylamine drug candidate can be an effective antidote both kinetically and structurally to reactivate the tabun-inhibited enzyme.
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Affiliation(s)
- Rabindranath Lo
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India-364 002.
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21
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Li Y, Zhou X, Chen S, Luo R, Jiang J, Liang Z, Ji H. Direct aerobic liquid phase epoxidation of propylene catalyzed by Mn(iii) porphyrin under mild conditions: evidence for the existence of both peroxide and Mn(iv)-oxo species from in situ characterizations. RSC Adv 2015. [DOI: 10.1039/c4ra15601c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Manganese(iii) porphyrin exhibited excellent activity for the selective oxidation of propylene. Experimental evidences that the generation of peroxide and Mn(iv) oxo species, which was well confirmed by in situ IR, in situ UV and MS.
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Affiliation(s)
- Yang Li
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Xiantai Zhou
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Shaoyun Chen
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Rongchang Luo
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Jun Jiang
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Zhongxiu Liang
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Hongbing Ji
- School of Chemistry and Chemical Engineering
- Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province
- Sun Yat-sen University
- Guangzhou 510275
- China
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22
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Hurem D, Dudding T. Enantioselective synthesis of mosquito oviposition pheromone and its epimer from a naturally occurring fatty acid. RSC Adv 2015. [DOI: 10.1039/c5ra19306k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Direct epoxidation of cis-5-hexadecenoic acid towards the synthesis of Mosquito Oviposition Pheromone (MOP) and evaluation of Dynamic Kinetic Asymmetric Transformation (DYKAT) for late-stage asymmetric induction are presented.
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Affiliation(s)
- David Hurem
- Department of Chemistry
- Brock University
- St. Catharines
- Canada
| | - Travis Dudding
- Department of Chemistry
- Brock University
- St. Catharines
- Canada
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23
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Mechanistic, crystallographic, and computational studies on the catalytic, enantioselective sulfenofunctionalization of alkenes. Nat Chem 2014; 6:1056-64. [PMID: 25411883 DOI: 10.1038/nchem.2109] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 09/30/2014] [Indexed: 01/18/2023]
Abstract
The stereocontrolled introduction of vicinal heteroatomic substituents into organic molecules is one of the most powerful ways of adding value and function. Although many methods exist for the introduction of oxygen- and nitrogen-containing substituents, the number of stereocontrolled methods for the introduction of sulfur-containing substituents pales by comparison. Previous reports from our laboratories have described sulfenofunctionalizations of alkenes that construct carbon-sulfur bonds vicinal to carbon-oxygen, carbon-nitrogen or carbon-carbon bonds with high levels of diastereospecificity and enantioselectivity. This process is enabled by the concept of Lewis-base activation of Lewis acids, which provides activation of Group 16 electrophiles. To provide a foundation for the expansion of substrate scope and improved selectivities, we have undertaken a comprehensive study of the catalytically active species. Insights gleaned from kinetic, crystallographic and computational methods have led to the introduction of a new family of sulfenylating agents that provide significantly enhanced selectivities.
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24
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Affiliation(s)
| | | | - Tehshik P. Yoon
- Department of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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25
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Davis RL, Stiller J, Naicker T, Jiang H, Jørgensen KA. Asymmetric organocatalytic epoxidations: reactions, scope, mechanisms, and applications. Angew Chem Int Ed Engl 2014; 53:7406-26. [PMID: 24919420 DOI: 10.1002/anie.201400241] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Indexed: 12/26/2022]
Abstract
Chiral epoxides serve as versatile building blocks in the synthesis of complex organic frameworks. The high strain imposed by the three-membered ring system makes epoxides prone to a variety of nucleophilic ring-opening reactions. Since the development of the Sharpless epoxidation, there have been many important contributions and advances in this area. With the rapid development of the field of asymmetric organocatalysis, a wide range of organocatalysts is now able to catalyze the epoxidation of broad class of unsaturated carbonyl compounds. In this Minireview, recent progress in the development of organocatalytic asymmetric epoxidation methods, the proposed mechanisms of these reactions and their applications as intermediates is reported.
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Affiliation(s)
- Rebecca L Davis
- Center for Catalysis, Department of Chemistry, Aarhus University, 8000 Aarhus C (Denmark); Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 (Canada)
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26
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Davis RL, Stiller J, Naicker T, Jiang H, Jørgensen KA. Organokatalytische asymmetrische Epoxidierungen - Reaktionen, Mechanismen und Anwendungen. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400241] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Denmark SE, Jaunet A. Catalytic, enantioselective, intramolecular carbosulfenylation of olefins. Preparative and stereochemical aspects. J Org Chem 2014; 79:140-71. [PMID: 24328051 PMCID: PMC3913010 DOI: 10.1021/jo4023765] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The first catalytic, enantioselective, intramolecular carbosulfenylation of isolated alkenes with aromatic nucleophiles is described. The combination of N-phenylsulfenylphthalimide, a chiral selenophosphoramide derived from BINAM, and ethanesulfonic acid as a cocatalytic Brønsted acid induced an efficient and selective cyclofunctionalization of various alkenes (aliphatic and aromatic) tethered to a 3,4-methylenedioxyphenyl ring. Under these conditions, 6-phenylthio-5,6,7,8-tetrahydronaphthalenes are formed diastereospecifically in good yields (50-92%) and high enantioselectivities (71:29-97:3 er). E-Alkenes reacted much more rapidly and with much higher selectivity than Z-alkenes, whereas electron-rich alkenes reacted more rapidly but with comparable selectivity to electron-neutral alkenes and electron-deficient alkenes. The Brønsted acid played a critical role in effecting reproducible enantioselectivity. A model for the origin of enantioselectivity and the dependence of rate and selectivity on alkene structure is proposed along with a rationale for the site selectivity in reactions with monoactivated arene nucleophiles.
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Affiliation(s)
- Scott E. Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, IL 61801
| | - Alex Jaunet
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, IL 61801
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28
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Mello R, Sarmiento-Monsalve JT, Vargas-Oviedo D, Acerete R, González-Núñez ME, Asensio G. Inverse solvent effects in the heterogeneous and homogeneous epoxidation of cis-2-heptene with [2-percarboxyethyl]-functionalized silica and meta-chloroperbenzoic acid. Org Biomol Chem 2014; 12:3246-50. [DOI: 10.1039/c4ob00253a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The organized solvent layer on the solid surface determines the reaction rate in the heterogeneous epoxidation of cis-2-heptene.
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Affiliation(s)
- Rossella Mello
- Departamento de Química Orgánica
- Facultad de Farmacia
- Universidad de Valencia
- 46100-Burjassot, Spain
| | | | - Diana Vargas-Oviedo
- Departamento de Química Orgánica
- Facultad de Farmacia
- Universidad de Valencia
- 46100-Burjassot, Spain
| | - Rafael Acerete
- Departamento de Química Inorgánica
- Facultad de Farmacia
- Universidad de Valencia
- 46100-Burjassot, Spain
| | | | - Gregorio Asensio
- Departamento de Química Orgánica
- Facultad de Farmacia
- Universidad de Valencia
- 46100-Burjassot, Spain
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29
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Lo R, Chandar NB, Kesharwani MK, Jain A, Ganguly B. In silico studies in probing the role of kinetic and structural effects of different drugs for the reactivation of tabun-inhibited AChE. PLoS One 2013; 8:e79591. [PMID: 24312449 PMCID: PMC3846473 DOI: 10.1371/journal.pone.0079591] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 09/27/2013] [Indexed: 11/24/2022] Open
Abstract
We have examined the reactivation mechanism of the tabun-conjugated AChE with various drugs using density functional theory (DFT) and post-Hartree-Fock methods. The electronic environments and structural features of neutral oximes (deazapralidoxime and 3-hydroxy-2-pyridinealdoxime) and charged monopyridinium oxime (2-PAM) and bispyridinium oxime (Ortho-7) are different, hence their efficacy varies towards the reactivation process of tabun-conjugated AChE. The calculated potential energy surfaces suggest that a monopyridinium reactivator is less favorable for the reactivation of tabun-inhibited AChE compared to a bis-quaternary reactivator, which substantiates the experimental study. The rate determining barrier with neutral oximes was found to be ∼2.5 kcal/mol, which was ∼5.0 kcal/mol lower than charged oxime drugs such as Ortho-7. The structural analysis of the calculated geometries suggest that the charged oximes form strong O…H and N…H hydrogen bonding and C-H…π non-bonding interaction with the tabun-inhibited enzyme to stabilize the reactant complex compared to separated reactants, which influences the activation barrier. The ability of neutral drugs to cross the blood-brain barrier was also found to be superior to charged antidotes, which corroborates the available experimental observations. The calculated activation barriers support the superiority of neutral oximes for the activation of tabun-inhibited AChE compared to charged oximes. However, they lack effective interactions with their peripheral sites. Docking studies revealed that the poor binding affinity of simple neutral oxime drugs such as 3-hydroxy-2-pyridinealdoxime inside the active-site gorge of AChE was significantly augmented with the addition of neutral peripheral units compared to conventional charged peripheral sites. The newly designed oxime drug 2 appears to be an attractive candidate as efficient antidote to kinetically and structurally reactivate the tabun-inhibited enzyme.
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Affiliation(s)
- Rabindranath Lo
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Nellore Bhanu Chandar
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
- Academy of Scientific and Innovative Research, CSIR-CSMCRI, Bhavnagar, Gujarat, India
| | - Manoj K. Kesharwani
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Aastha Jain
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Bishwajit Ganguly
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
- Academy of Scientific and Innovative Research, CSIR-CSMCRI, Bhavnagar, Gujarat, India
- * E-mail:
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30
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Morlot J, Uyttebroeck N, Agustin D, Poli R. Solvent-Free Epoxidation of Olefins Catalyzed by “[MoO2(SAP)]”: A New Mode oftert-Butylhydroperoxide Activation. ChemCatChem 2012. [DOI: 10.1002/cctc.201200068] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Schöberl C, Jäger V. 3- and 4-Uloses Derived from N-Acetyl-D-glucosamine: A Unique Pair of Complementary Organocatalysts for Asymmetric Epoxidation of Alkenes. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100735] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Probing substrate–product relationships by natural abundance deuterium 2D NMR spectroscopy in liquid-crystalline solvents: epoxidation of linoleate to vernoleate by two different plant enzymes. Anal Bioanal Chem 2012; 402:2985-98. [DOI: 10.1007/s00216-012-5748-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 01/12/2012] [Accepted: 01/13/2012] [Indexed: 11/25/2022]
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33
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Kyne SH, Miles JAL, Percy JM, Singh K. Executing and Rationalizing the Synthesis of a Difluorinated Analogue of a Ring-Expanded Calystegine B2. J Org Chem 2011; 77:991-8. [DOI: 10.1021/jo2022845] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sara H. Kyne
- WestCHEM, Department of Pure
and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U. K
| | - Jonathan A. L. Miles
- Department of Chemistry, University of Leicester, University Road, Leicester
LE1 7RH, U. K
| | - Jonathan M. Percy
- WestCHEM, Department of Pure
and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U. K
| | - Kuldip Singh
- Department of Chemistry, University of Leicester, University Road, Leicester
LE1 7RH, U. K
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34
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Vega-Pérez JM, Periñán I, Vega-Holm M, Palo-Nieto C, Iglesias-Guerra F. New mannose-derived ketones as organocatalysts for enantioselective dioxirane-mediated epoxidation of arylalkenes. Part 3: Chiral ketones from sugars. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.07.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Cheong PHY, Legault CY, Um JM, Çelebi-Ölçüm N, Houk KN. Quantum mechanical investigations of organocatalysis: mechanisms, reactivities, and selectivities. Chem Rev 2011; 111:5042-137. [PMID: 21707120 PMCID: PMC3154597 DOI: 10.1021/cr100212h] [Citation(s) in RCA: 429] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Paul Ha-Yeon Cheong
- Oregon State University, Department of Chemistry, 153 Gilbert Hall, Corvallis, OR 97331-4003 USA
| | - Claude Y. Legault
- University of Sherbrooke, Department of Chemistry, 2500 boul. de l’Université, local D1-3029, Sherbrooke (Québec) J1K 2R1 CANADA
| | - Joann M. Um
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - Nihan Çelebi-Ölçüm
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - K. N. Houk
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
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36
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Weill N, Corbeil CR, De Schutter JW, Moitessier N. Toward a computational tool predicting the stereochemical outcome of asymmetric reactions: Development of the molecular mechanics‐based program ACE and application to asymmetric epoxidation reactions. J Comput Chem 2011; 32:2878-89. [DOI: 10.1002/jcc.21869] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 05/05/2011] [Accepted: 05/21/2011] [Indexed: 01/22/2023]
Affiliation(s)
- Nathanael Weill
- Department of Chemistry, McGill University, Montreal, Quebec, Canada H3A 2K6
| | | | | | - Nicolas Moitessier
- Department of Chemistry, McGill University, Montreal, Quebec, Canada H3A 2K6
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Alberch L, Cheng G, Seo SK, Li X, Boulineau FP, Wei A. Stereoelectronic factors in the stereoselective epoxidation of glycals and 4-deoxypentenosides. J Org Chem 2011; 76:2532-47. [PMID: 21417287 PMCID: PMC3074037 DOI: 10.1021/jo102382r] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Glycals and 4-deoxypentenosides (4-DPs), unsaturated pyranosides with similar structures and reactivity profiles, can exhibit a high degree of stereoselectivity upon epoxidation with dimethyldioxirane (DMDO). In most cases, the glycals and their corresponding 4-DP isosteres share the same facioselectivity, implying that the pyran substituents are largely responsible for the stereodirecting effect. Fully substituted dihydropyrans are subject to a "majority rule", in which the epoxidation is directed toward the face opposite to two of the three groups. Removing one of the substituents has a variable effect on the epoxidation outcome, depending on its position and also on the relative stereochemistry of the remaining two groups. Overall, we observe that the greatest loss in facioselectivity for glycals and 4-DPs is caused by removal of the C3 oxygen, followed by the C5/anomeric substituent, and least of all by the C4/C2 oxygen. DFT calculations based on polarized-π frontier molecular orbital (PPFMO) theory support a stereoelectronic role for the oxygen substituents in 4-DP facioselectivity, but less clearly so in the case of glycals. We conclude that the anomeric oxygen in 4-DPs contributes toward a stereoelectronic bias in facioselectivity whereas the C5 alkoxymethyl in glycals imparts a steric bias, which at times can compete with the stereodirecting effects from the other oxygen substituents.
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Affiliation(s)
- Laura Alberch
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084
| | - Gang Cheng
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084
| | - Seung-Kee Seo
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084
| | - Xuehua Li
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084
| | - Fabien P. Boulineau
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084
| | - Alexander Wei
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084
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Fenger TH, Marinescu LG, Bols M. Cyclodextrin Ketones with the Catalytic Group at the Secondary Rim and Their Effectiveness in Enzyme-Like Epoxidation of Stilbenes. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001696] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Ohwada T. Orbital phase environments and stereoselectivities. Top Curr Chem (Cham) 2011; 289:129-81. [PMID: 21279574 DOI: 10.1007/128_2008_38] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Facial selections are reviewed to propose a new theory, orbital phase environment, for stereoselectivities of organic reactions. The orbital phase environment is a generalized idea of the secondary orbital interaction between the non-reacting centers and the unsymmetrization of the orbitals at the reacting centers arising from in-phase and out-of-phase overlapping with those at the neighboring non-reacting sites. In this context, the nucleophilic addition preferentially occurs on the face of the carbonyl functionality opposite to the better electron-donating orbital at the β position. In a similar manner to the carbonyl cases, the preferred reaction faces of olefins in electrophilic addition reactions are opposite to the better electron-donating orbitals at the β positions. The orbital phase environments in Diels-Alder reactions are also reviewed.
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Affiliation(s)
- Tomohiko Ohwada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113, Japan,
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41
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Synthesis of new carbohydrate-derived ketones as organocatalysts in the enantioselective epoxidation of arylalkenes. Part 2: Chiral ketones from sugars. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.11.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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42
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Kantz A, Gassner GT. Nature of the reaction intermediates in the flavin adenine dinucleotide-dependent epoxidation mechanism of styrene monooxygenase. Biochemistry 2010; 50:523-32. [PMID: 21166448 DOI: 10.1021/bi101328r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Styrene monooxygenase (SMO) is a two-component flavoenzyme composed of an NADH-specific flavin reductase (SMOB) and FAD-specific styrene epoxidase (NSMOA). NSMOA binds tightly to reduced FAD and catalyzes the stereospecific addition of one atom of molecular oxygen to the vinyl side chain of styrene in the enantioselective synthesis of S-styrene oxide. In this mechanism, molecular oxygen first reacts with NSMOA(FAD(red)) to yield an FAD C(4a)-peroxide intermediate. This species is nonfluorescent and has an absorbance maximum of 382 nm. Styrene then reacts with the peroxide intermediate with a second-order rate constant of (2.6 ± 0.1) × 10(6) M(-1) s(-1) to yield a fluorescent intermediate with an absorbance maximum of 368 nm. We compute an activation free energy of 8.7 kcal/mol for the oxygenation step, in good agreement with that expected for a peroxide-catalyzed epoxidation, and acid-quenched samples recovered at defined time points in the single-turnover reaction indicate that styrene oxide synthesis is coincident with the formation phase of the fluorescent intermediate. These findings support FAD C(4a)-peroxide being the oxygen atom donor and the identity of the fluorescent intermediate as an FAD C(4a)-hydroxide product of the styrene epoxidation. Overall, four pH-dependent rate constants corresponding to peroxyflavin formation (pK(a) = 7.2), styrene epoxidation (pK(a) = 7.7), styrene oxide dissociation (pK(a) = 8.3), and hydroxyflavin dehydration (pK(a) = 7.6) are needed to fit the single-turnover kinetics.
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Affiliation(s)
- Auric Kantz
- Department of Chemistry and Biochemistry, San Francisco State University, San Francisco, CA 94132, USA
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Wong OA, Shi Y. Asymmetric epoxidation of fluoroolefins by chiral dioxirane. Fluorine effect on enantioselectivity. J Org Chem 2010; 74:8377-80. [PMID: 19795858 DOI: 10.1021/jo901553t] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The asymmetric epoxidation of various fluoroolefins has been studied using chiral ketone catalyst, and up to 93% ee was achieved with fructose-derived ketone 1.
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Affiliation(s)
- O Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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44
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Bond CW, Cresswell AJ, Davies SG, Fletcher AM, Kurosawa W, Lee JA, Roberts PM, Russell AJ, Smith AD, Thomson JE. Ammonium-directed oxidation of cyclic allylic and homoallylic amines. J Org Chem 2009; 74:6735-48. [PMID: 19642691 DOI: 10.1021/jo9012783] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ammonium-directed olefinic oxidation of a range of cyclic allylic and homoallylic amines has been investigated. Functionalization of a range of allylic 3-(N,N-dibenzylamino)cycloalk-1-enes with m-CPBA in the presence of Cl(3)CCO(2)H gives exclusively the corresponding syn-epoxide for the 5-membered ring (>99:1 dr), the anti-epoxide for the 8-membered ring (>99:1 dr), and predominantly the anti-epoxide for the 7-membered ring (94:6 dr). Oxidation of the homoallylic amines 3-(N-benzylamino)methylcyclohex-1-ene and 3-(N,N-dibenzylamino)methylcyclohex-1-ene gave, in both cases, the corresponding N-protected 1,2-anti-2,3-syn-3-aminomethylcyclohexane-1,2-diol with high levels of diastereoselectivity (>or=90:10 dr). The versatile synthetic intermediates resulting from these oxidation reactions are readily transformed into a range of amino diols.
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Affiliation(s)
- Christopher W Bond
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK
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A Theoretical Study on the Reaction of Phosphadioxiranes and Thiadioxiranes;Disproportionation versus Epoxidation. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.10.2217] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Benkovics T, Du J, Guzei IA, Yoon TP. Anionic halocuprate(II) complexes as catalysts for the oxaziridine-mediated aminohydroxylation of olefins. J Org Chem 2009; 74:5545-52. [PMID: 19507883 PMCID: PMC2743488 DOI: 10.1021/jo900902k] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have discovered that the oxaziridine-mediated copper-catalyzed aminohydroxylation reaction recently discovered in our laboratories is dramatically accelerated in the presence of halide additives. The use of this more active catalyst system enables the efficient aminohydroxylation of electronically and sterically deactivated styrenes and also enables the use of nonstereogenic 3,3-dialkyl oxaziridines as terminal oxidants in the aminohydroxylation reaction. We present evidence that anionic halocuprate(II) complexes are the catalytically active species responsible for the increased reactivity under these conditions. This unexpected observation has led us to re-evaluate our mechanistic understanding of this reaction. On the basis of the results of a variety of radical trapping experiments, we propose a modified mechanism that involves a homolytic reaction of the olefin with a copper(II)-activated oxaziridine. Together, the observation that anionic additives significantly increase the oxidizing ability of oxaziridines and the recognition of the radical nature of reactions of oxaziridines under these conditions suggest that a variety of new oxidative transformations catalyzed by halocuprate(II) complexes should be possible.
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Affiliation(s)
- Tamas Benkovics
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
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47
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Litvinas ND, Brodsky BH, Du Bois J. C-H hydroxylation using a heterocyclic catalyst and aqueous H2O2. Angew Chem Int Ed Engl 2009; 48:4513-6. [PMID: 19449353 DOI: 10.1002/anie.200901353] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Substituted benzoxathiazines function as catalysts for the selective hydroxylation of tertiary C-H bonds. Mechanistic studies have revealed an unanticipated disparity between oxaziridine reactivity and catalyst performance and have given way to a new catalyst and an aqueous H(2)O(2) reaction protocol that greatly facilitate such transformations (see scheme).
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Affiliation(s)
- Nichole D Litvinas
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
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48
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Schneebeli ST, Hall ML, Breslow R, Friesner R. Quantitative DFT modeling of the enantiomeric excess for dioxirane-catalyzed epoxidations. J Am Chem Soc 2009; 131:3965-73. [PMID: 19243187 DOI: 10.1021/ja806951r] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein we report the first fully quantum mechanical study of enantioselectivity for a large data set. We show that transition state modeling at the UB3LYP-DFT/6-31G* level of theory can accurately model enantioselectivity for various dioxirane-catalyzed asymmetric epoxidations. All the synthetically useful high selectivities are successfully "predicted" by this method. Our results hint at the utility of this method to further model other asymmetric reactions and facilitate the discovery process for the experimental organic chemist. Our work suggests the possibility of using computational methods not simply to explain organic phenomena, but also to predict them quantitatively.
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Litvinas N, Brodsky B, Du Bois J. CH Hydroxylation Using a Heterocyclic Catalyst and Aqueous H2O2. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901353] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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50
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Acosta-Silva C, Branchadell V. Density functional methods in the study of oxygen transfer reactions. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0541-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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