1
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Morrill C, Péter Á, Amalina I, Pye E, Crisenza GEM, Kaltsoyannis N, Procter DJ. Diastereoselective Radical 1,4-Ester Migration: Radical Cyclizations of Acyclic Esters with SmI 2. J Am Chem Soc 2022; 144:13946-13952. [PMID: 35858251 PMCID: PMC9377304 DOI: 10.1021/jacs.2c05972] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Reductive cyclizations of carbonyl compounds, mediated
by samarium(II)
diiodide (SmI2, Kagan’s reagent), represent an invaluable
platform to generate molecular complexity in a stereocontrolled manner.
In addition to classical ketone and aldehyde substrates, recent advances
in radical chemistry allow the cyclization of lactone and lactam-type
substrates using SmI2. In contrast, acyclic esters are
considered to be unreactive to SmI2 and their participation
in reductive cyclizations is unprecedented. Here, we report a diastereoselective
radical 1,4-ester migration process, mediated by SmI2,
that delivers stereodefined alkene hydrocarboxylation products via
radical cyclization of acyclic ester groups in α-carbomethoxy
δ-lactones. Isotopic labeling experiments and computational
studies have been used to probe the mechanism of the migration. We
propose that a switch in conformation redirects single electron transfer
from SmI2 to the acyclic ester group, rather than the “more
reactive” lactone carbonyl. Our study paves the way for the
use of elusive ketyl radicals, derived from acyclic esters, in SmI2-mediated reductive cyclizations.
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Affiliation(s)
- Charlotte Morrill
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Áron Péter
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Ilma Amalina
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Emma Pye
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Giacomo E M Crisenza
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Nikolas Kaltsoyannis
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - David J Procter
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
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2
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Abstract
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SmI2 was introduced to organic chemistry as a single
electron transfer agent in 1977. After ca. 15 years of latency, the
scientific community has realized the high potential of this reagent,
and its chemistry has started blooming. This versatile reagent has
mediated a myriad of new bond formations, cyclizations, and other
reactions. Its popularity stems largely from the fact that three different
intermediates, radical anions, radicals, and anions, depending on
the ligand or additive used, could be obtained. Each of these intermediates
could in principle lead to a different product. While these options
vastly enrich the repertoire of SmI2, they necessitate
a thorough mechanistic understanding, especially concerning how appropriate
ligands direct the SmI2 to the desired intermediate. Our
first paper on this subject dealt with the reduction of an activated
double bond. The results were puzzling, especially the H/D isotope
effect, which depended on the order of the reagents addition. This
seminal paper was fundamental to an understanding of how the SmI2 works and enabled us to later explain various phenomena.
For example, it was found that in a given reaction, when MeOH is used
as a proton source, a spiro compound is obtained, while a bicyclic
product is obtained when t-BuOH is used. Our contribution
culminated in formulating guidelines for the rational use of proton
donors in SmI2 reactions. The need to understand
the complexity of the effect of additives
on various processes is nicely demonstrated in photoinduced reactions.
For example, hexamethylphosphoramide (HMPA) enhances the reduction
of anthracene while hampering the reaction of benzyl chloride. The
mechanistic understanding gained enabled us also to broaden the scope
of photostimulated reactions from substrates reacting by a dissociative
electron transfer mechanism to normal reductions, which are difficult
to accomplish at the ground state. Harnessing the classical knowledge
of proton transfer mechanisms to our SmI2 research enabled
us to decipher an old conundrum: why does the combination of water
and amine have such an enhancing effect on the reactivity of SmI2, which is not typical of these two when used separately.
In our studies on the affinity of ligands to SmI2, we discovered
that, in contradistinction to the accepted dogma, SmI2 is
much more azaphilic than it is oxophilic. On the basis of the size
difference between Sm3+ and Sm2+, we developed
a simple diagnostic tool for the nature of the steps following the
electron transfer. The reduction of imines showed that substrate affinity
to SmI2 plays also a crucial role. In these reactions,
new features such as autocatalysis and catalysis by quantum dots were
discovered. Several studies of the ligand effect lead to a clear formulation
of when an inner sphere or outer sphere electron transfer should be
expected. In addition, several reactions where proton-coupled electron
transfer (PCET) is the dominant mechanism were identified. Finally,
the surprisingly old tool of NMR “shift reagents” was
rediscovered and used to directly derive essential information on
the binding constants of ligands and substrates to SmI2.
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Affiliation(s)
- Shmaryahu Hoz
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat Gan 5290002, Israel
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3
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Huang HM, Procter DJ. Selective Electron Transfer Reduction of Urea-Type Carbonyls. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800794] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry; University of Manchester; Oxford Road Manchester, M13 9PL UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Oxford Road Manchester, M13 9PL UK
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4
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You B, Shen M, Xie G, Mao H, Lv X, Wang X. Alternative Sm(II) Species-Mediated Cascade Coupling/Cyclization for the Synthesis of Oxobicyclo[3.1.0]hexane-1-ols. Org Lett 2018; 20:530-533. [DOI: 10.1021/acs.orglett.7b03613] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Bingxin You
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
| | - Mengmeng Shen
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
| | - Guanqun Xie
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
- School
of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, People’s Republic of China
| | - Hui Mao
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
| | - Xin Lv
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
| | - Xiaoxia Wang
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
- School
of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, People’s Republic of China
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5
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Maity S, Flowers RA, Hoz S. Aza versus Oxophilicity of SmI
2
: A Break of a Paradigm. Chemistry 2017; 23:17070-17077. [PMID: 29024166 DOI: 10.1002/chem.201703394] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Indexed: 12/19/2022]
Affiliation(s)
- Sandeepan Maity
- Department of Chemistry Lehigh University 6 E Packer Ave. Bethlehem Pennsylvania- 18015 USA
- Department of Chemistry Bar-Ilan University Geha Road Ramat Gan- 52900 Israel
| | - Robert A. Flowers
- Department of Chemistry Lehigh University 6 E Packer Ave. Bethlehem Pennsylvania- 18015 USA
| | - Shmaryahu Hoz
- Department of Chemistry Bar-Ilan University Geha Road Ramat Gan- 52900 Israel
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6
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Maity S, Hoz S. Pushing SmI2Reactions towards the Limit‐ Entropy Driven Reduction of a Benzene Ring. ChemistrySelect 2017. [DOI: 10.1002/slct.201700214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sandeepan Maity
- Department of ChemistryBar-Ilan University Ramat Gan Israel 52900
| | - Shmaryahu Hoz
- Department of ChemistryBar-Ilan University Ramat Gan Israel 52900
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7
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Thurow S, Lenardão EJ, Just-Baringo X, Procter DJ. Reduction of Selenoamides to Amines Using SmI2–H2O. Org Lett 2016; 19:50-53. [DOI: 10.1021/acs.orglett.6b03325] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Samuel Thurow
- Laboratório
de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil
| | - Eder J. Lenardão
- Laboratório
de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil
| | - Xavier Just-Baringo
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
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8
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Just-Baringo X, Morrill C, Procter DJ. Highly selective SmI2–H2O-promoted radical cyclisation of five-membered lactones. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.03.056] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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9
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Shi S, Szostak R, Szostak M. Proton-coupled electron transfer in the reduction of carbonyls using SmI2–H2O: implications for the reductive coupling of acyl-type ketyl radicals with SmI2–H2O. Org Biomol Chem 2016; 14:9151-9157. [DOI: 10.1039/c6ob01621a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The feasibility of concerted PCET in the reduction of carbonyl groups using SmI2–H2O is quantitatively assessed.
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Affiliation(s)
- Shicheng Shi
- Department of Chemistry
- Rutgers University
- Newark
- USA
| | - Roman Szostak
- Department of Chemistry
- Wroclaw University
- Wroclaw 50-383
- Poland
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10
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Cheisson T, Auffrant A, Nocton G. η5–η1 Switch in Divalent Phosphaytterbocene Complexes with Neutral Iminophosphoranyl Pincer Ligands: Solid-State Structures and Solution NMR 1JYb–P Coupling Constants. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00814] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thibault Cheisson
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
| | - Grégory Nocton
- Laboratoire de Chimie Moléculaire, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
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11
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Maity S, Hoz S. Deciphering a 20-Year-Old Conundrum: The Mechanisms of Reduction by the Water/Amine/SmI2Mixture. Chemistry 2015; 21:18394-400. [PMID: 26525449 DOI: 10.1002/chem.201503104] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Sandeepan Maity
- Department of Chemistry, Bar-Ilan University, Ramat Gan, 52900 (Israel)
| | - Shmaryahu Hoz
- Department of Chemistry, Bar-Ilan University, Ramat Gan, 52900 (Israel).
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12
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Just-Baringo X, Procter DJ. Sm(II)-Mediated Electron Transfer to Carboxylic Acid Derivatives: Development of Complexity-Generating Cascades. Acc Chem Res 2015; 48:1263-75. [PMID: 25871998 DOI: 10.1021/acs.accounts.5b00083] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Reductive electron transfer (ET) to organic compounds is a powerful method for the activation of substrates via the formation of radicals, radical anions, anions, and dianions that can be exploited in bond-cleaving and bond-forming processes. Since its introduction to the synthetic community in 1977 by Kagan, SmI2 has become one of the most important reducing agents available in the laboratory. Despite its widespread application in aldehyde and ketone reduction, it was widely accepted that carboxylic acid derivatives could not be reduced by SmI2; only recently has our work led to this dogma being overturned, and the reduction of carboxylic acid derivatives using SmI2 can now take its place alongside aldehyde/ketone reduction as a powerful activation mode for synthesis. In this Account, we set out our studies of the reduction of carboxylic acid derivatives using SmI2, SmI2-H2O, and SmI2-H2O-NR3 and the exploitation of the unusual radical anions that are now accessible in unprecedented carbon-carbon bond-forming processes. The Account begins with our serendipitous discovery that SmI2 mixed with H2O is able to reduce six-membered lactones to diols, a transformation previously thought to be impossible. After the successful development of selective monoreductions of Meldrum's acid and barbituric acid heterocyclic feedstocks, we then identified the SmI2-H2O-NR3 reagent system for the efficient reduction of a range of acyclic carboxylic acid derivatives that typically present a significant challenge for ET reductants. Mechanistic studies have led us to propose a common mechanism for the reduction of carboxylic acid derivatives using Sm(II), with only subtle changes observed as the carboxylic acid derivative and Sm(II) reagent system are varied. At the center of our postulated mechanism is the proposed reversibility of the first ET to the carbonyl of carboxylic acid derivatives, and this led us to devise several strategies that allow the radical anion intermediates to be exploited productively in efficient new processes. First, we have used internal directing groups in substrates to "switch on" productive ET to esters and amides and have exploited such an approach in tag-removal cyclization processes that deliver molecular scaffolds of significance in biology and materials science. Second, we have exploited external ligands to facilitate ET to carboxylic acid derivatives and have applied the strategy in telescoped reaction sequences. Finally, we have employed follow-up cyclizations with alkenes, alkynes, and allenes to intercept radical anion intermediates formed along the reaction path and have employed this strategy in complexity-generating cascade approaches to biologically significant molecular architectures. From our studies, it is now clear that Sm(II)-mediated ET to carboxylic acid derivatives constitutes a general strategy for inverting the polarity of the carbonyl, allowing nucleophilic carbon-centered radicals to be formed and exploited in novel chemical processes.
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Affiliation(s)
| | - David J. Procter
- School of Chemistry, University of Manchester, Manchester M13 9PL, U.K
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13
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Shen M, Tu Y, Xie G, Niu Q, Mao H, Xie T, Flowers RA, Lv X, Wang X. Allylsamarium Bromide-Mediated Cascade Cyclization of Homoallylic Esters. Synthesis of 2-(2-Hydroxyalkyl)cyclopropanols and 2-(2-Hydroxyethyl)bicyclo[2.1.1]hexan-1-ols. J Org Chem 2015; 80:52-61. [PMID: 25427109 DOI: 10.1021/jo501797w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In continuation of our previous study on the intramolecular reductive coupling of simple homoallylic esters promoted by allylSmBr/HMPA/H2O, which afforded a facile synthesis of 2-(2-hydroxyalkyl)cyclopropanols, here we report the reductive cascade cyclization of but-3-enyl but-3-enoates mediated by allylSmBr/HMPA/CuCl2·2H2O, in which the two C═C bonds were successively coupled to allow the construction of the structurally interesting bridged bicyclic tertiary alcohols. Thus, the 2-(2-hydroxyethyl)bicyclo[2.1.1]hexan-1-ols were prepared in moderate to good yields with excellent diastereoselectivity.
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Affiliation(s)
- Mengmeng Shen
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Yawei Tu
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Guanqun Xie
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Qingsheng Niu
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Hui Mao
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Tingting Xie
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Robert A Flowers
- ‡Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Xin Lv
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
| | - Xiaoxia Wang
- †Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
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14
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Yalavac I, Lyons SE, Webb MR, Procter DJ. SmI2-H2O-mediated 5-exo/6-exo lactone radical cyclisation cascades. Chem Commun (Camb) 2014; 50:12863-6. [PMID: 25211167 DOI: 10.1039/c4cc05404k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The SmI2-H2O reagent system mediates challenging 5-exo/6-exo lactone radical cascade cyclisations that deliver carbo[5.4.0]bicyclic motifs in a diastereoselective, one-pot process that establish two new carbocyclic rings and four stereocentres.
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Affiliation(s)
- Irem Yalavac
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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15
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Szostak M, Spain M, Eberhart AJ, Procter DJ. Mechanism of SmI2/Amine/H2O-Promoted Chemoselective Reductions of Carboxylic Acid Derivatives (Esters, Acids, and Amides) to Alcohols. J Org Chem 2014; 79:11988-2003. [DOI: 10.1021/jo5018525] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Michal Szostak
- Department
of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Malcolm Spain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Andrew J. Eberhart
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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16
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Szostak M, Spain M, Procter DJ. Selective Synthesis of α,α-Dideuterio Alcohols by the Reduction of Carboxylic Acids Using SmI2 and D2O as Deuterium Source under SET Conditions. Org Lett 2014; 16:5052-5. [DOI: 10.1021/ol502404e] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Michal Szostak
- Department
of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Malcolm Spain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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17
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18
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An J, Work DN, Kenyon C, Procter DJ. Evaluating a Sodium Dispersion Reagent for the Bouveault–Blanc Reduction of Esters. J Org Chem 2014; 79:6743-7. [DOI: 10.1021/jo501093g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Jie An
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - D. Neil Work
- Pentagon Fine Chemicals Ltd., Lower Road, Halebank,
Widnes, Cheshire WA8 8NS, United Kingdom
| | - Craig Kenyon
- Pentagon Fine Chemicals Ltd., Lower Road, Halebank,
Widnes, Cheshire WA8 8NS, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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19
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Szostak M, Spain M, Procter DJ. Ketyl-Type Radicals from Cyclic and Acyclic Esters are Stabilized by SmI2(H2O)n: The Role of SmI2(H2O)n in Post-Electron Transfer Steps. J Am Chem Soc 2014; 136:8459-66. [DOI: 10.1021/ja503494b] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Michal Szostak
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL United Kingdom
| | - Malcolm Spain
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL United Kingdom
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL United Kingdom
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20
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Szostak M, Fazakerley NJ, Parmar D, Procter DJ. Cross-Coupling Reactions Using Samarium(II) Iodide. Chem Rev 2014; 114:5959-6039. [DOI: 10.1021/cr400685r] [Citation(s) in RCA: 290] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Michal Szostak
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Neal J. Fazakerley
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Dixit Parmar
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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21
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Szostak M, Spain M, Procter DJ. Determination of the Effective Redox Potentials of SmI2, SmBr2, SmCl2, and their Complexes with Water by Reduction of Aromatic Hydrocarbons. Reduction of Anthracene and Stilbene by Samarium(II) Iodide–Water Complex. J Org Chem 2014; 79:2522-37. [DOI: 10.1021/jo4028243] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Michal Szostak
- School of Chemistry, University of Manchester, Oxford
Road, Manchester M13 9PL, United Kingdom
| | - Malcolm Spain
- School of Chemistry, University of Manchester, Oxford
Road, Manchester M13 9PL, United Kingdom
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford
Road, Manchester M13 9PL, United Kingdom
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22
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Szostak M, Lyons SE, Spain M, Procter DJ. Mechanistic investigation of the selective reduction of Meldrum's acids to β-hydroxy acids using SmI2and H2O. Chem Commun (Camb) 2014; 50:8391-4. [DOI: 10.1039/c4cc03216k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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