1
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Zhang X, Tong Y, Li G, Zhao H, Chen G, Yao H, Tong R. 1,5-Allyl Shift by a Sequential Achmatowicz/Oxonia-Cope/Retro-Achmatowicz Rearrangement. Angew Chem Int Ed Engl 2022; 61:e202205919. [PMID: 35670657 DOI: 10.1002/anie.202205919] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Indexed: 12/12/2022]
Abstract
1,3-Allyl and 1,2-allyl shifts through [3,3]- and [2,3]-sigmatropic rearrangements are well-established and widely used in organic synthesis. In contrast, 1,5-allyl shift through related [3,5]-sigmatropic rearrangement is unknown because [3,5]-sigmatropic rearrangement is thermally Woodward-Hoffmann forbidden. Herein, we report an unexpected discovery of a formal 1,5-allyl shift of allyl furfuryl alcohol through a 2-step sequential rearrangement. Mechanistically, this formal 1,5-allyl shift is achieved through a sequential ring expansion/contraction rearrangement: 1) Achmatowicz rearrangement (ring expansion), and 2) cascade oxonia-Cope rearrangement/retro-Achmatowicz rearrangement (ring contraction). This new 1,5-allyl shift method is demonstrated with >20 examples and expected to find applications in organic synthesis and materials chemistry.
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Affiliation(s)
- Xiayan Zhang
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China.,Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Yi Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Gang Li
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510260, China
| | - Hao Zhao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510260, China
| | - Guanye Chen
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510260, China
| | - Hongliang Yao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510260, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China.,Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China.,Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510260, China
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2
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Zhang XY, Tong Y, Li G, Zhao H, Chen G, Yao H, Tong R. 1,5‐Allyl Shift by a Sequential Achmatowicz/Oxonia‐Cope/Retro‐Achmatowicz Rearrangement. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiayan Y. Zhang
- Department of Chemistry The Hong Kong University of Science and Technology Clearwater Bay, Kowloon, Hong Kong China
- Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) The Hong Kong University of Science and Technology Clearwater Bay, Kowloon, Hong Kong China
| | - Yi Tong
- Department of Chemistry The Hong Kong University of Science and Technology Clearwater Bay, Kowloon, Hong Kong China
| | - Gang Li
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and Utilization Institute of Zoology Guangdong Academy of Sciences Guangzhou Guangdong, 510260 China
| | - Hao Zhao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and Utilization Institute of Zoology Guangdong Academy of Sciences Guangzhou Guangdong, 510260 China
| | - Guanye Chen
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and Utilization Institute of Zoology Guangdong Academy of Sciences Guangzhou Guangdong, 510260 China
| | - Hongliang Yao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and Utilization Institute of Zoology Guangdong Academy of Sciences Guangzhou Guangdong, 510260 China
| | - Rongbiao Tong
- Department of Chemistry The Hong Kong University of Science and Technology Clearwater Bay, Kowloon, Hong Kong China
- Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) The Hong Kong University of Science and Technology Clearwater Bay, Kowloon, Hong Kong China
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and Utilization Institute of Zoology Guangdong Academy of Sciences Guangzhou Guangdong, 510260 China
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3
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Pérez-Barcia Á, Peña-Gallego Á, Mandado M. Tracking the Transition from Pericyclic to Pseudopericyclic Reaction Mechanisms Using Multicenter Electron Delocalization Analysis: The [1,3] Sigmatropic Rearrangement. J Phys Chem A 2021; 125:8337-8344. [PMID: 34510896 PMCID: PMC8693182 DOI: 10.1021/acs.jpca.1c06620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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Herein,
the power of multicenter electron delocalization analysis
to elucidate the intricacies of concerted reaction mechanisms is brought
to light by tracking the transition of [1,3] sigmatropic rearrangements
from the high-barrier pericyclic mechanism in 1-butene to the barrierless
pseudopericyclic mechanism in 1,2-diamino-1-nitrosooxyethane. This
transition has been progressively achieved by substituting the migrating
group, changing the donor and acceptor atoms, and functionalizing
the alkene unit with weak and strong electron-donating and electron-withdrawing
groups. Fourteen [1,3] sigmatropic reactions with electronic energy
barriers ranging from 1 to 89 kcal/mol have been investigated. A very
good correlation has been found between the barrier and the four-center
electron delocalization at the transition state, the latter calculated
for the atoms involved in the four-centered ring adduct formed along
the reaction path. Surprisingly, the barrier has been found to be
independent of the bond strength between the migrating group and the
donor atom so that only the changes induced in the multicenter bonding
control the kinetics of the reaction. Additional insights into the
effect of atom substitution and group functionalization have also
been extracted from the analysis of the multicenter electron delocalization
profiles along the reaction path and qualitatively supported by the
topological analysis of the electron density.
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Affiliation(s)
- Álvaro Pérez-Barcia
- Department of Physical Chemistry, University of Vigo, Lagoas-Marcosende s/n, 36310 Vigo, Spain
| | - Ángeles Peña-Gallego
- Department of Physical Chemistry, University of Vigo, Lagoas-Marcosende s/n, 36310 Vigo, Spain
| | - Marcos Mandado
- Department of Physical Chemistry, University of Vigo, Lagoas-Marcosende s/n, 36310 Vigo, Spain
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4
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Agirre M, Henrion S, Rivilla I, Miranda JI, Cossío FP, Carboni B, Villalgordo JM, Carreaux F. 1,3-Dioxa-[3,3]-sigmatropic Oxo-Rearrangement of Substituted Allylic Carbamates: Scope and Mechanistic Studies. J Org Chem 2018; 83:14861-14881. [PMID: 30457341 DOI: 10.1021/acs.joc.8b01320] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An unexpected 1,3-dioxa-[3,3]-sigmatropic rearrangement during the treatment of aryl- and alkenyl-substituted allylic alcohols with activated isocyanates is reported. The reorganization of bonds is highly dependent on the electron density of the aromatic ring and the nature of isocyanate used. This metal-free tandem reaction from branched allyl alcohols initiated by a carbamoylation reaction and followed by a sigmatropic rearrangement thus offers a new access to ( E)-cinnamyl and conjugated ( E, E)-diene carbamates, such as N-acyl and N-sulfonyl derivatives. A computational study was conducted in order to rationalize this phenomenon, and a rearrangement progress kinetic analysis was performed.
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Affiliation(s)
- Maddalen Agirre
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Química , Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , P° Manuel Lardizabal 3 , 20018 San Sebastián/Donostia , Spain
| | - Sylvain Henrion
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , 263, avenue du Général Leclerc, Campus de Beaulieu , F-35000 Rennes , France
| | - Ivan Rivilla
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Química , Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , P° Manuel Lardizabal 3 , 20018 San Sebastián/Donostia , Spain
| | - José I Miranda
- SGIker NMR Facility , Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU) , Avda. Tolosa 72 , E-20018 San Sebastián/Donostia , Spain
| | - Fernando P Cossío
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Química , Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , P° Manuel Lardizabal 3 , 20018 San Sebastián/Donostia , Spain
| | - Bertrand Carboni
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , 263, avenue du Général Leclerc, Campus de Beaulieu , F-35000 Rennes , France
| | - José M Villalgordo
- VillaPharma Research, Parque Tecnológico de Fuente Alamo , Ctra. El Estrecho-Lobosillo, Av. Azul , 30320 Murcia , Spain
| | - François Carreaux
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , 263, avenue du Général Leclerc, Campus de Beaulieu , F-35000 Rennes , France
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5
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Junk CP, He Y, Zhang Y, Smith JR, Dixon DA, Vasiliu M, Lemal DM. Chemistry of the Highly Strained Alkene Perfluorobicyclo[2.2.0]hex‐1(4)‐ene. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Yigang He
- Department of Chemistry Dartmouth College 03755 Hanover NH USA
| | - Yin Zhang
- Department of Chemistry Dartmouth College 03755 Hanover NH USA
| | - Joshua R. Smith
- Department of Chemistry Dartmouth College 03755 Hanover NH USA
| | - David A. Dixon
- Department of Chemistry and Biochemistry University of Alabama 35487 Tuscaloosa AL USA
| | - Monica Vasiliu
- Department of Chemistry and Biochemistry University of Alabama 35487 Tuscaloosa AL USA
| | - David M. Lemal
- Department of Chemistry Dartmouth College 03755 Hanover NH USA
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6
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Ott AA, Packard MH, Ortuño MA, Johnson A, Suding VP, Cramer CJ, Topczewski JJ. Evidence for a Sigmatropic and an Ionic Pathway in the Winstein Rearrangement. J Org Chem 2018; 83:8214-8224. [PMID: 29870252 DOI: 10.1021/acs.joc.8b00961] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The spontaneous rearrangement of allylic azides is thought to be a sigmatropic reaction. Presented herein is a detailed investigation into the rearrangement of several allylic azides. A combination of experiments including equilibrium studies, kinetic analysis, density functional theory calculations, and selective 15N-isotopic labeling are included. We conclude that the Winstein rearrangement occurs by the assumed sigmatropic pathway under most conditions. However, racemization was observed for some cyclic allylic azides. A kinetic analysis of this process is provided, which supports a previously undescribed ionic pathway.
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Affiliation(s)
- Amy A Ott
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Mary H Packard
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Manuel A Ortuño
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Alayna Johnson
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Victoria P Suding
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Christopher J Cramer
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Joseph J Topczewski
- Department of Chemistry , University of Minnesota Twin Cities , Minneapolis , Minnesota 55455 , United States
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7
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Kreiman HW, Batali ME, Jamieson CS, Lyon MA, Duncan JA. CASSCF Calculations Reveal Competitive Chair (Pericyclic) and Boat (Pseudopericyclic) Transition States for the [3,3] Sigmatropic Rearrangement of Allyl Esters. J Org Chem 2018; 83:1717-1726. [PMID: 29350923 DOI: 10.1021/acs.joc.7b02316] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(10,8)CASPT2/6-31G**//(10,8)CASSCF/6-31G** and CCSD(T)/cc-pVDZ//(10,8)-CASSCF/6-31G** calculations have been performed on the potential surface for the [3,3] sigmatropic allyl ester rearrangements of cis-3-penten-2-yl acetate (16) to trans-3-penten-2-yl acetate (17) and 3-buten-2-yl acetate (21) to trans-2-buten-1-yl acetate (22). The results are compared to DFT (B3LYP/6-31G**) calculations on the known 16 → 17 rearrangement that reported it to be concerted and pseudopericyclic through a boat-shaped transition structure ( Birney, D. M. et al. J. Am. Chem. Soc. 2009 , 131 , 528 - 537 ). The CASSCF calculations, on the other hand, uncovered competitive concerted pathways for both the 16 → 17 and 21 → 22 rearrangements, though it was necessary to apply certain approximations in the former case. While one CASSCF pathway in each case involves a boat-shaped transition structure, similar to the one located through DFT calculations, the other pathway involves a chair-shaped transition structure. Preference for chair or boat is shown to be method dependent. Moreover, examination of the CASSCF active-space orbitals clearly confirms that the boat-shaped transition structures are pseudopericyclic but significantly also established that the chair-shaped transition structures are clearly pericyclic. Conclusions based on these results, and regarding our understanding of pericyclic vs pseudopericyclic reactions, are proffered.
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Affiliation(s)
- Henry W Kreiman
- Department of Chemistry, Lewis & Clark College , Portland, Oregon 97219-7899, United States
| | - Mackenzie E Batali
- Department of Chemistry, Lewis & Clark College , Portland, Oregon 97219-7899, United States
| | - Cooper S Jamieson
- Department of Chemistry, Lewis & Clark College , Portland, Oregon 97219-7899, United States
| | - Molly A Lyon
- Department of Chemistry, Lewis & Clark College , Portland, Oregon 97219-7899, United States
| | - James A Duncan
- Department of Chemistry, Lewis & Clark College , Portland, Oregon 97219-7899, United States
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8
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Rajale T, Sharma S, Unruh DK, Stroud DA, Birney DM. A pseudopericyclic [3,5]-sigmatropic rearrangement of a coumarin trichloroacetimidate derivative. Org Biomol Chem 2018; 16:874-879. [DOI: 10.1039/c7ob02335a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A Woodward–Hoffmann forbidden, eight-centered transition state leads to the sole product of a pentadienyl imidate rearrangement.
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Affiliation(s)
- Trideep Rajale
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
- Center for Integrated Nanotechnologies
| | - Shikha Sharma
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - Daniel K. Unruh
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - Daniel A. Stroud
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
| | - David M. Birney
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
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9
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Zuo A, Birney DM. A Computational Study on the Addition of HONO to Alkynes toward the Synthesis of Isoxazoles; a Bifurcation, Pseudopericyclic Pathways and a Barrierless Reaction on the Potential Energy Surface. J Org Chem 2017; 82:8873-8881. [PMID: 28726408 DOI: 10.1021/acs.joc.7b01152] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Homopropargyl alcohols react with t-BuONO to form acyloximes which can be oxidatively cyclized to yield ioxazoles. The mechanism for the initial reaction of HONO with alkynes to form acyloximes (e.g., 13c) has been explored at the B3LYP/6-31G(d,p) + ZPVE level of theory. The observed chemoselectivity and regioselectivity are explained via an acid-catalyzed mechanism. Furthermore, the potential energy surface revealed numerous surprising features. The addition of HONO (8) to protonated 1-phenylpropyne (18) is calculated to follow a reaction pathway involving sequential transition states (TS6 and TS8), for which reaction dynamics likely play a role. This reaction pathway can bypass the expected addition product 21 as well as transition state TS8, directly forming the rearranged product 23. Nevertheless, TS8 is key to understanding the potential energy surface; there is a low barrier for the pseudopericylic [1,3]-NO shift, calculated to be only 8.4 kcal/mol above 21. This places TS8 well below TS6, making the valley-ridge inflection point (VRI or bifurcation) and direct formation of 23 possible. The final tautomerization step to the acyloxime can be considered to be a [1,5]-proton shift. However, the rearrangement in the case of 17h to 13c is calculated to be barrierless, arguably because the pathway is pseudopericyclic and exothermic.
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Affiliation(s)
- Ang Zuo
- Department of Chemistry and Biochemistry, Texas Tech University , Lubbock, Texas 79409-1061, United States
| | - David M Birney
- Department of Chemistry and Biochemistry, Texas Tech University , Lubbock, Texas 79409-1061, United States
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10
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Phung C, Tantillo DJ, Hein JE, Pinhas AR. The mechanism of the reaction between an aziridine and carbon dioxide with no added catalyst. J PHYS ORG CHEM 2017. [DOI: 10.1002/poc.3735] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chau Phung
- Department of Chemistry; University of Cincinnati; Cincinnati OH USA
| | - Dean J. Tantillo
- Department of Chemistry; University of California-Davis; Davis CA USA
| | - Jason E. Hein
- Department of Chemistry; University of British Columbia; Vancouver British Columbia Canada
| | - Allan R. Pinhas
- Department of Chemistry; University of Cincinnati; Cincinnati OH USA
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11
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Espinosa Ferao A, Streubel R. A Computational Study on the Stability of Oxaphosphirane Rings towards Closed-Shell Valence Isomerization. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700177] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Arturo Espinosa Ferao
- Departamento de Química Orgánica; Facultad de Química; Universidad de Murcia; Campus de Espinardo 30100 Murcia Spain
| | - Rainer Streubel
- Institut für Anorganische Chemie; Rheinischen Friedrich-Wilhelms-Universität Bonn; Gerhardt-Domagk-Strasse 1 53121 Bonn Germany
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12
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Abstract
Catalysis is common. Rational catalyst design, however, is at the frontier of chemical science. Although the histories of physical organic and synthetic organic chemistry boast key chapters involving [3s,3s] sigmatropic shifts, catalysis of these reactions is much less common than catalysis of ostensibly more complex processes. The comparative dearth of catalysts for sigmatropic shifts is perhaps a result of the perception that transition state structures for these reactions, like their reactants, are nonpolar and therefore not amenable to selective stabilization and its associated barrier lowering. However, as demonstrated in this Account, transition state structures for [3s,3s] sigmatropic shifts can in fact have charge distributions that differ significantly from those of reactants, even for hydrocarbon substrates, allowing for barriers to be decreased and rates increased. In some cases, differences in charge distribution result from the inclusion of heteroatoms at specific positions in reactants, but in other cases differences are actually induced by catalysts. Perhaps surprisingly, strategies for complexation of transition state structures that remain nonpolar are also possible. In general, the strategies for catalysis employed can be characterized as involving either mechanistic intervention, where a catalyst induces a change from the concerted mechanism expected for a [3s,3s] sigmatropic shift to a multistep process (cutting the transformation into halves or smaller pieces) whose overall barrier is decreased relative to the concerted process, or transition state complexation, where a catalyst simply binds (holds) more tightly to the transition state structure for a [3s,3s] sigmatropic shift than to the reactant, leading to a lower barrier in the presence of the catalyst. Both of these strategies can be considered to be biomimetic in that enzymes frequently induce multistep processes and utilize selective transition state stabilization for the steps involved. In addition, transition state complexation was the principle around which catalytic antibodies were originally designed. The field of catalysis of sigmatropic shifts is now ready for rational design. The studies described here all provide evidence for the origins of rate acceleration, derived in large part from the results of quantum chemical calculations, that can now be applied to the design of new catalysts for [3s,3s] and other sigmatropic shifts.
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Affiliation(s)
- Dean J. Tantillo
- University of California—Davis, Davis, California 95616, United States
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13
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García CM, Ferao AE, Schnakenburg G, Streubel R. CPh3 as a functional group in P-heterocyclic chemistry: elimination of HCPh3 in the reaction of P-CPh3 substituted Li/Cl phosphinidenoid complexes with Ph2CO. Dalton Trans 2016; 45:2378-85. [DOI: 10.1039/c5dt04595a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Li/Cl phosphinidenoid complexes 2a–c react with benzaldehyde to give 3a–c, but with benzophenone formation of complexes 4 and 5 was observed, the latter revealing the elimination of HCPh3.
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Affiliation(s)
- C. Murcia García
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn
- D-53121 Bonn
- Germany
| | - A. Espinosa Ferao
- Departamento de Química Orgánica
- Facultad de Química
- Universidad de Murcia
- E-30071 Murcia
- Spain
| | - G. Schnakenburg
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn
- D-53121 Bonn
- Germany
| | - R. Streubel
- Institut für Anorganische Chemie
- Rheinische Friedrich-Wilhelms-Universität Bonn
- D-53121 Bonn
- Germany
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14
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López CS, Faza ON, Freindorf M, Kraka E, Cremer D. Solving the Pericyclic–Pseudopericyclic Puzzle in the Ring-Closure Reactions of 1,2,4,6-Heptatetraene Derivatives. J Org Chem 2015; 81:404-14. [DOI: 10.1021/acs.joc.5b01997] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Carlos Silva López
- Departamento
de Química Orgánica, Campus Lagoas-Marcosende, 36310 Vigo, Spain
| | - Olalla Nieto Faza
- Departamento
de Química Orgánica, Campus Lagoas-Marcosende, 36310 Vigo, Spain
| | - Marek Freindorf
- Computational
and Theoretical Chemistry Group (CATCO), Department of Chemistry, Southern Methodist University, 3215 Daniel Avenue, Dallas, Texas 75275-0314, United States
| | - Elfi Kraka
- Computational
and Theoretical Chemistry Group (CATCO), Department of Chemistry, Southern Methodist University, 3215 Daniel Avenue, Dallas, Texas 75275-0314, United States
| | - Dieter Cremer
- Computational
and Theoretical Chemistry Group (CATCO), Department of Chemistry, Southern Methodist University, 3215 Daniel Avenue, Dallas, Texas 75275-0314, United States
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15
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Affiliation(s)
- Rainer Herges
- Institut für Organische
Chemie, Kiel University, Otto-Hahn-Platz 4, 24118 Kiel, Germany
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