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Kaur N, Bhardwaj P, Devi M, Verma Y, Grewal P. Photochemical reactions in five and six-membered polyheterocycles synthesis. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1622732] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Navjeet Kaur
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Pranshu Bhardwaj
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Meenu Devi
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Yamini Verma
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Pooja Grewal
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
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2
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Yuan L, Jia CX, Qu HJ, Chi YJ, Yu HT. Does the Neophyl-like Rearrangement Play a Decisive Role in Intramolecular Cyclization of Iminyl Radicals? A Combined Quantum Chemistry and Numerical Simulation Investigation of the Cyclization Mechanism and Product Distributions of Bicyclic 2-Allyl-2-methyl-2,3-dihydro-1 H-inden-1-iminyl Radical and Several Iminyl Model Compounds. J Org Chem 2019; 84:2721-2731. [DOI: 10.1021/acs.joc.8b03134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Lang Yuan
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China
| | - Cai-Xin Jia
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China
| | - Hong-Jie Qu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China
| | - Yu-Juan Chi
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China
| | - Hai-Tao Yu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China
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3
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Mudgal M, Rishi S, Lumpuy DA, Curran KA, Verley KL, Sobczak AJ, Dang TP, Sulimoff N, Kumar A, Sevilla MD, Wnuk SF, Adhikary A. Prehydrated One-Electron Attachment to Azido-Modified Pentofuranoses: Aminyl Radical Formation, Rapid H-Atom Transfer, and Subsequent Ring Opening. J Phys Chem B 2017; 121:4968-4980. [PMID: 28425714 DOI: 10.1021/acs.jpcb.7b01838] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Methyl 2-azido-2-deoxy-α-d-lyxofuranoside (1a) and methyl 2-azido-2-deoxy-β-d-ribofuranoside (2) were prepared from d-xylose or d-arabinose, respectively. Employing ESR and DFT/B3LYP/6-31G* calculations, we investigated (i) aminyl radical (RNH·) formation and (ii) reaction pathways of RNH·. Prehydrated electron attachment to 1a and 2 at 77 K produced transient azide anion radical (RN3·-) which reacts via rapid N2 loss at 77 K, forming nitrene anion radical (RN·-). Rapid protonation of RN·- at 77 K formed RNH· and -OH. 15N-labeled-1a confirmed this mechanism. Investigations employing in-house synthesized site-specifically deuterated derivatives of 1a (e.g., CH3 (1b), C4 (1c), and C5 (1d)) established that (a) a facile intramolecular H atom transfer from C5 to RNH· generated C5· and RNH2. C5· formation had a small deuterium kinetic isotope effect suggesting that this reaction does not occur via direct H atom abstraction. (b) Subsequently, C5· underwent a facile unimolecular conversion to ring-opened C4·. Identification of ring-opened C4· intermediate confirms the mechanism of C5'· mediated unaltered base release associated with DNA-strand break. However, for 2, ESR studies established thermally activated intermolecular H atom abstraction by RNH· from the methyl group at C1. Thus, sugar ring configuration strongly influences the site and pathway of RNH· mediated reactions in pentofuranoses.
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Affiliation(s)
- Mukesh Mudgal
- Department of Chemistry and Biochemistry, Florida International University , Miami, Florida 33199, United States
| | - Sunny Rishi
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Daniel A Lumpuy
- Department of Chemistry and Biochemistry, Florida International University , Miami, Florida 33199, United States
| | - Keaton A Curran
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Kathryn Lynn Verley
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Adam J Sobczak
- Department of Chemistry and Biochemistry, Florida International University , Miami, Florida 33199, United States
| | - Thao P Dang
- Department of Chemistry and Biochemistry, Florida International University , Miami, Florida 33199, United States
| | - Natasha Sulimoff
- Department of Chemistry and Biochemistry, Florida International University , Miami, Florida 33199, United States
| | - Anil Kumar
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Michael D Sevilla
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Stanislaw F Wnuk
- Department of Chemistry and Biochemistry, Florida International University , Miami, Florida 33199, United States
| | - Amitava Adhikary
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
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Walton JC. Functionalised Oximes: Emergent Precursors for Carbon-, Nitrogen- and Oxygen-Centred Radicals. Molecules 2016; 21:63. [PMID: 26751437 PMCID: PMC6273297 DOI: 10.3390/molecules21010063] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 12/29/2015] [Accepted: 12/30/2015] [Indexed: 11/16/2022] Open
Abstract
Oxime derivatives are easily made, are non-hazardous and have long shelf lives. They contain weak N-O bonds that undergo homolytic scission, on appropriate thermal or photochemical stimulus, to initially release a pair of N- and O-centred radicals. This article reviews the use of these precursors for studying the structures, reactions and kinetics of the released radicals. Two classes have been exploited for radical generation; one comprises carbonyl oximes, principally oxime esters and amides, and the second comprises oxime ethers. Both classes release an iminyl radical together with an equal amount of a second oxygen-centred radical. The O-centred radicals derived from carbonyl oximes decarboxylate giving access to a variety of carbon-centred and nitrogen-centred species. Methods developed for homolytically dissociating the oxime derivatives include UV irradiation, conventional thermal and microwave heating. Photoredox catalytic methods succeed well with specially functionalised oximes and this aspect is also reviewed. Attention is also drawn to the key contributions made by EPR spectroscopy, aided by DFT computations, in elucidating the structures and dynamics of the transient intermediates.
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Affiliation(s)
- John C Walton
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, UK.
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5
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Bühl M, DaBell P, Manley DW, McCaughan RP, Walton JC. Bicarbonate and Alkyl Carbonate Radicals: Structural Integrity and Reactions with Lipid Components. J Am Chem Soc 2015; 137:16153-62. [DOI: 10.1021/jacs.5b10693] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael Bühl
- University of St. Andrews, EaStCHEM School of Chemistry, St.
Andrews, Fife KY16 9ST, United Kingdom
| | - Peter DaBell
- University of St. Andrews, EaStCHEM School of Chemistry, St.
Andrews, Fife KY16 9ST, United Kingdom
| | - David W. Manley
- University of St. Andrews, EaStCHEM School of Chemistry, St.
Andrews, Fife KY16 9ST, United Kingdom
| | - Rory P. McCaughan
- University of St. Andrews, EaStCHEM School of Chemistry, St.
Andrews, Fife KY16 9ST, United Kingdom
| | - John C. Walton
- University of St. Andrews, EaStCHEM School of Chemistry, St.
Andrews, Fife KY16 9ST, United Kingdom
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6
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Adhikary A, Kumar A, Bishop CT, Wiegand TJ, Hindi RM, Adhikary A, Sevilla MD. π-Radical to σ-Radical Tautomerization in One-Electron-Oxidized 1-Methylcytosine and Its Analogs. J Phys Chem B 2015; 119:11496-505. [PMID: 26237072 DOI: 10.1021/acs.jpcb.5b05162] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this work, iminyl σ-radical formation in several one-electron-oxidized cytosine analogs, including 1-MeC, cidofovir, 2'-deoxycytidine (dCyd), and 2'-deoxycytidine 5'-monophosphate (5'-dCMP), were investigated in homogeneous, aqueous (D2O or H2O) glassy solutions at low temperatures by employing electron spin resonance (ESR) spectroscopy. Upon employing density functional theory (DFT) (DFT/B3LYP/6-31G* method), the calculated hyperfine coupling constant (HFCC) values of iminyl σ-radical agree quite well with the experimentally observed ones, thus confirming its assignment. ESR and DFT studies show that the cytosine iminyl σ-radical is a tautomer of the deprotonated cytosine π-cation radical [cytosine π-aminyl radical, C(N4-H)(•)]. Employing 1-MeC samples at various pHs ranging from ca. 8 to 11, ESR studies show that the tautomeric equilibrium between C(N4-H)(•) and the iminyl σ-radical at low temperature is too slow to be established without added base. ESR and DFT studies agree that, in the iminyl σ-radical, the unpaired spin is localized on the exocyclic nitrogen (N4) in an in-plane pure p-orbital. This gives rise to an anisotropic nitrogen hyperfine coupling (Azz = 40 G) from N4 and a near isotropic β-nitrogen coupling of 9.7 G from the cytosine ring nitrogen at N3. Iminyl σ-radical should exist in its N3-protonated form, as the N3-protonated iminyl σ-radical is stabilized in solution by over 30 kcal/mol (ΔG = -32 kcal/mol) over its conjugate base, the N3-deprotonated form. This is the first observation of an isotropic β-hyperfine ring nitrogen coupling in an N-centered DNA radical. Our theoretical calculations predict that the cytosine iminyl σ-radical can be formed in double-stranded DNA by a radiation-induced ionization-deprotonation process that is only 10 kcal/mol above the lowest energy path.
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Affiliation(s)
- Amitava Adhikary
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Anil Kumar
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Casandra T Bishop
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Tyler J Wiegand
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Ragda M Hindi
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Ananya Adhikary
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
| | - Michael D Sevilla
- Department of Chemistry, Oakland University , Rochester, Michigan 48309, United States
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7
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Walton JC. The importance of chain conformational mobility during 5-exo-cyclizations of C-, N- and O-centred radicals. Org Biomol Chem 2015; 12:7983-92. [PMID: 25179567 DOI: 10.1039/c4ob01419g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction coordinates of an archetypical set of 5-exo cyclizations of C-, N- and O-centred radicals were investigated by computational methods. G4 theory, and DFT with the um062x functional, were able to rationalise counterintuitive factors such as the 'normal' order of rate constants being: N-centred < C-centred < O-centred radicals. The access angle between the radical centre and the double bond was identified as a key factor. Examination of its evolution during ring closure implied that rigidity at the N-ends of the chains, and the consequent extra energy needed to attain chair-like transition states, might be the reason for slow aminyl cyclizations. A novel linear correlation between cyclization activation energies and the access angles was discovered. The preference for cis-1,2-disubstituted product formation was also accounted for in terms of interaction between the hyperconjugatively delocalized SOMO and the alkene π* orbital.
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Affiliation(s)
- John C Walton
- University of St. Andrews, EaStCHEM School of Chemistry, St. Andrews, Fife, KY16 9ST, UK.
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8
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Walton JC. The oxime portmanteau motif: released heteroradicals undergo incisive EPR interrogation and deliver diverse heterocycles. Acc Chem Res 2014; 47:1406-16. [PMID: 24654991 PMCID: PMC4012714 DOI: 10.1021/ar500017f] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Selective syntheses are now available for compounds of many classes, based on C-centered radicals, exploiting a diverse range of mechanisms. The prospect for chemistry based around N- and O-centered radicals is probably more favorable because of the importance of heterocycles as biologically active materials. Heteroradical chemistry is still comparatively underdeveloped due to the need for safe and easy ways of generating them. Oxime esters appeared promising candidates to meet this need because literature reports and our EPR spectroscopic examinations showed they readily dissociated on photolysis with production of a pair of N- and O-centered radicals. It soon became apparent that a whole suite of benign oxime-containing molecules could be pressed into service. The bimodality of the oxime motif meant that by suitable choice of functionality the reactions could be directed to yield selectively products from either the N-centered radicals or from the O-centered radicals. We found that on one hand photolyses of acetophenone oxime esters of carboxylic acids yielded alicyclics. On the other hand, aromatic and heteroaromatic acyl oximes (as well as dioxime oxalates) afforded good yields of phenanthridines and related heterocycles. Easily prepared oxime oxalate amides released carbamoyl radicals, and pleasingly, β-lactams were thereby obtained. Oxime carbonates and oxime carbamates, available via our novel 1,1'-carbonyldiimidazole (CDI)-based preparations, were accessible alternatives for iminyl radicals and hence for phenanthridine preparations. In their second modes, these compounds proved their value as precursors for exotic alkoxycarbonyloxyl and carbamoyloxyl radicals. Microwave-assistance was shown to be a particularly convenient procedure with O-phenyl oxime ethers. The iminyl radicals generated from such precursors with alkene, alkyne, and aromatic acceptor substituents furnished pyrrole, quinoline, phenanthridine, benzonaphthiridine, indolopyridine, and other systems. Microwave irradiations with 2-(aminoaryl)alkanone O-phenyl oximes enabled either dihydroquinazolines or quinazolines to be obtained in very good yields. The fine quality of the EPR spectra, acquired during photolyses of all the O-carbonyl oxime types, marked this as an important complement to existing ways of obtaining such spectra in solution. Quantifications enabled SARs to be obtained for key reaction types of N- and O-centered radicals, thus putting mechanistic chemistry in this area on a much firmer footing. Surprises included the inverse gem-dimethyl effect in 5-exo-cyclizations of iminyls and the interplay of spiro- with ortho-cyclization onto aromatics. Insights into unusual 4-exo-cyclizations of carbamoyl radicals showed the process to be more viable than pent-4-enyl 4-exo-ring closure. Another surprise was the magnitude of the difference in CO2 loss rate from alkoxycarbonyloxyl radicals as compared with acyloxyl radicals. Their rapid 5-exo-cyclization was charted, as was their preferred spiro-cyclization onto aromatics. The first evidence that N-monosubstituted carbamoyloxyls had finite lifetimes was also forthcoming. It is evident that oxime derivatives have excellent credentials as reagents for radical generation and that there is ample room to extend their applications to additional radical types and for further heterocycle syntheses. There is also clear scope for the development of preparative procedures based around the alkoxyl and aminyl radicals that emerge downstream from oxime carbonate and oxime carbamate dissociations.
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Affiliation(s)
- John C. Walton
- EaStCHEM School of Chemistry, University of St. Andrews, St.
Andrews, Fife KY16 9ST, U.K
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McBurney RT, Walton JC. Interplay of ortho- with spiro-cyclisation during iminyl radical closures onto arenes and heteroarenes. Beilstein J Org Chem 2013; 9:1083-92. [PMID: 23766822 PMCID: PMC3678706 DOI: 10.3762/bjoc.9.120] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Accepted: 05/09/2013] [Indexed: 12/05/2022] Open
Abstract
Sensitised photolyses of ethoxycarbonyl oximes of aromatic and heteroaromatic ketones yielded iminyl radicals, which were characterised by EPR spectroscopy. Iminyls with suitably placed arene or heteroarene acceptors underwent cyclisations yielding phenanthridine-type products from ortho-additions. For benzofuran and benzothiophene acceptors, spiro-cyclisation predominated at low temperatures, but thermodynamic control ensured ortho-products, benzofuro- or benzothieno-isoquinolines, formed at higher temperatures. Estimates by steady-state kinetic EPR established that iminyl radical cyclisations onto aromatics took place about an order of magnitude more slowly than prototypical C-centred radicals. The cyclisation energetics were investigated by DFT computations, which gave insights into factors influencing the two cyclisation modes.
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Affiliation(s)
- Roy T McBurney
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK
| | - John C Walton
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK
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10
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Chi YJ, Yu HT. Intramolecular cyclization reaction mechanism and regioselectivities of unsubstituted and benzene-substituted 4-penteniminyl radicals: A DFT investigation. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2012.11.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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González HF, Blanco-Lomas M, Rivado-Casas L, Rodrı́guez MA, Campos PJ, Sampedro D. Addition of Oxime Derivatives to Alkynyl Fischer Carbene Complexes. Organometallics 2012. [DOI: 10.1021/om300570q] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Héctor F. González
- Departamento de
Quı́mica, Centro de Investigación
en Sı́ntesis Quı́mica, CISQ, Universidad de La Rioja, Madre de Dios, 51, E-26006
Logroño, Spain
| | - Marina Blanco-Lomas
- Departamento de
Quı́mica, Centro de Investigación
en Sı́ntesis Quı́mica, CISQ, Universidad de La Rioja, Madre de Dios, 51, E-26006
Logroño, Spain
| | - Laura Rivado-Casas
- Departamento de
Quı́mica, Centro de Investigación
en Sı́ntesis Quı́mica, CISQ, Universidad de La Rioja, Madre de Dios, 51, E-26006
Logroño, Spain
| | - Miguel A. Rodrı́guez
- Departamento de
Quı́mica, Centro de Investigación
en Sı́ntesis Quı́mica, CISQ, Universidad de La Rioja, Madre de Dios, 51, E-26006
Logroño, Spain
| | - Pedro J. Campos
- Departamento de
Quı́mica, Centro de Investigación
en Sı́ntesis Quı́mica, CISQ, Universidad de La Rioja, Madre de Dios, 51, E-26006
Logroño, Spain
| | - Diego Sampedro
- Departamento de
Quı́mica, Centro de Investigación
en Sı́ntesis Quı́mica, CISQ, Universidad de La Rioja, Madre de Dios, 51, E-26006
Logroño, Spain
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McBurney RT, Harper AD, Slawin AMZ, Walton JC. An all-purpose preparation of oxime carbonates and resultant insights into the chemistry of alkoxycarbonyloxyl radicals. Chem Sci 2012. [DOI: 10.1039/c2sc21298f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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13
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Gómez AM, Uriel C, Company MD, López JC. Synthetic Strategies Directed Towards 5a-Carbahexopyranoses and Derivatives Based on 6-endo-trig Radical Cyclizations. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100956] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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14
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Blanco-Lomas M, Caballero A, Campos PJ, González HF, López-Sola S, Rivado-Casas L, Rodríguez MA, Sampedro D. Photochemically Driven Addition of Iminyl Radicals to Alkynyl Fischer Carbene Complexes. Organometallics 2011. [DOI: 10.1021/om200438y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marina Blanco-Lomas
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Alegría Caballero
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Pedro J. Campos
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Héctor F. González
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Susana López-Sola
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Laura Rivado-Casas
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Miguel A. Rodríguez
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
| | - Diego Sampedro
- Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, Unidad Asociada al CSIC, Madre de Dios, 51, E-26006, Logroño, Spain
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15
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Alonso R, Caballero A, Campos PJ, Rodríguez MA. Photochemistry of acyloximes: synthesis of heterocycles and natural products. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.09.078] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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