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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Silantyeva EA, Willits RK, Becker ML. Postfabrication Tethering of Molecular Gradients on Aligned Nanofibers of Functional Poly(ε-caprolactone)s. Biomacromolecules 2019; 20:4494-4501. [PMID: 31721566 PMCID: PMC7546418 DOI: 10.1021/acs.biomac.9b01264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Substrates with combinations of topographical and biochemical cues are highly useful for a number of fundamental biological investigations. Tethered molecular concentration gradients in particular are highly desired for a number of biomedical applications including cell migration. Herein, we report a versatile method for the fabrication of aligned nanofiber substrates with a tunable concentration gradient along the fiber direction. 4-Dibenzocyclooctynol (DIBO) was used as an initiator for the ring-opening copolymerization of ε-caprolactone (εCL) and allyl-functionalized ε-caprolactone (AεPCL), which yielded a well-defined polymer with orthogonal functional handles. These materials were fabricated into aligned nanofiber substrates via touch-spinning. Fibers were modified post-spinning with a concentration gradient of fluorescently labeled dye via a light activated thiol-ene reaction through a photomask. As a demonstration, the cell adhesive peptide RGD was chemically tethered to the fiber surface at a second functionalization site via strain-promoted azide-alkyne cycloaddition (SPAAC). This novel approach affords fabrication of dual functional nanofiber substrates.
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Affiliation(s)
- Elena A. Silantyeva
- Department of Polymer Science, The University of Akron, Akron, OH 44325, USA
| | - Rebecca K. Willits
- Department of Biomedical Engineering, The University of Akron, Akron, OH 44325, USA
| | - Matthew L. Becker
- Department of Polymer Science, The University of Akron, Akron, OH 44325, USA
- Department of Biomedical Engineering, The University of Akron, Akron, OH 44325, USA
- Department of Chemistry, Duke University, Durham, NC 27708, USA
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
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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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Morrill C, Jensen C, Just-Baringo X, Grogan G, Turner NJ, Procter DJ. Biocatalytic Conversion of Cyclic Ketones Bearing α-Quaternary Stereocenters into Lactones in an Enantioselective Radical Approach to Medium-Sized Carbocycles. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800121] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Charlotte Morrill
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | - Chantel Jensen
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | | | - Gideon Grogan
- Department of Chemistry; University of York, Heslington; York YO10 5DD UK
| | | | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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5
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Morrill C, Jensen C, Just-Baringo X, Grogan G, Turner NJ, Procter DJ. Biocatalytic Conversion of Cyclic Ketones Bearing α-Quaternary Stereocenters into Lactones in an Enantioselective Radical Approach to Medium-Sized Carbocycles. Angew Chem Int Ed Engl 2018; 57:3692-3696. [PMID: 29393988 PMCID: PMC6055628 DOI: 10.1002/anie.201800121] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Indexed: 01/11/2023]
Abstract
Cyclic ketones bearing α‐quaternary stereocenters underwent efficient kinetic resolution using cyclohexanone monooxygenase (CHMO) from Acinetobacter calcoaceticus. Lactones possessing tetrasubstituted stereocenters were obtained with high enantioselectivity (up to >99 % ee) and complete chemoselectivity. Preparative‐scale biotransformations were exploited in conjunction with a SmI2‐mediated cyclization process to access complex, enantiomerically enriched cycloheptan‐ and cycloctan‐1,4‐diols. In a parallel approach to structurally distinct products, enantiomerically enriched ketones from the resolution with an α‐quaternary stereocenter were used in a SmI2‐mediated cyclization process to give cyclobutanol products (up to >99 % ee).
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Affiliation(s)
- Charlotte Morrill
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
| | - Chantel Jensen
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
| | | | - Gideon Grogan
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Nicholas J Turner
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
| | - David J Procter
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
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6
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Huang HM, Adams RW, Procter DJ. Reductive cyclisations of amidines involving aminal radicals. Chem Commun (Camb) 2018; 54:10160-10163. [DOI: 10.1039/c8cc05178j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The first general study of aminal radical cyclisations, triggered by reduction of amidines with SmI2, delivers quinazolinones with complete diastereocontrol.
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Affiliation(s)
- Huan-Ming Huang
- School of Chemistry
- Oxford Road
- University of Manchester
- Manchester
- UK
| | - Ralph W. Adams
- School of Chemistry
- Oxford Road
- University of Manchester
- Manchester
- UK
| | - David J. Procter
- School of Chemistry
- Oxford Road
- University of Manchester
- Manchester
- UK
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7
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Huang HM, Procter DJ. Radical Heterocyclization and Heterocyclization Cascades Triggered by Electron Transfer to Amide-Type Carbonyl Compounds. Angew Chem Int Ed Engl 2017; 56:14262-14266. [DOI: 10.1002/anie.201708354] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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8
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Huang HM, Procter DJ. Radical Heterocyclization and Heterocyclization Cascades Triggered by Electron Transfer to Amide-Type Carbonyl Compounds. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708354] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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; Manchester M13 9PL UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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9
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Chciuk TV, Anderson WR, Flowers RA. Reversibility of Ketone Reduction by SmI2–Water and Formation of Organosamarium Intermediates. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00392] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tesia V. Chciuk
- Department of Chemistry, Lehigh University, 6
East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
| | - William R. Anderson
- Department of Chemistry, Lehigh University, 6
East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
| | - Robert A. Flowers
- Department of Chemistry, Lehigh University, 6
East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
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10
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A green strategy for the synthesis of sulfone derivatives of p-methylaminophenol: Kinetic evaluation and antibacterial susceptibility. Sci Rep 2017; 7:4436. [PMID: 28667267 PMCID: PMC5493611 DOI: 10.1038/s41598-017-04581-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/16/2017] [Indexed: 11/21/2022] Open
Abstract
This is one of the few examples in which the diverse products have been synthesized just by changing the applied potential. The synthesis of sulfonyl derivatives of p-methylaminophenol were carried out by reaction of the electrogenerated p-methylquinoneimine with sulfinic acids. Various types of mono (MSP), bis (BSP) and tris (TSP) sulfonyl p-methyl aminophenols were obtained by changing the electrode potential, in one pot under green conditions. The mono sulfonyl-p-(methylamino)phenol derivatives (MSP) were assessed for their in vitro antibacterial activity against the gram positive (Staphylococcus aureus) and gram negative (Escherichia coli) strains. It was found that the tested compounds were more active against Staphylococcus aureus than Escherichia coli. We also found that the antimicrobial activity of MSP derivatives to vary in the order MSP4 (R = CH3) > MSP1 (R = p-tolyl) ≈ MSP2 (R = phenyl) > MSP3 (R = p-ClC6H4). Moreover, the observed homogeneous rate constants (kobs) of the reaction of p-methyl quinoneimine with sulfinic acids were estimated in various pH values, based on the EC and ECEC mechanisms, by comparing the simulated cyclic voltammograms with the experimental ones.
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11
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Huq SR, Shi S, Diao R, Szostak M. Mechanistic Study of SmI2/H2O and SmI2/Amine/H2O-Promoted Chemoselective Reduction of Aromatic Amides (Primary, Secondary, Tertiary) to Alcohols via Aminoketyl Radicals. J Org Chem 2017. [DOI: 10.1021/acs.joc.7b00372] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Syed R. Huq
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Shicheng Shi
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Ray Diao
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
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12
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Huang HM, Procter DJ. Dearomatizing Radical Cyclizations and Cyclization Cascades Triggered by Electron-Transfer Reduction of Amide-Type Carbonyls. J Am Chem Soc 2017; 139:1661-1667. [DOI: 10.1021/jacs.6b12077] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry, Oxford Road, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - David J. Procter
- School of Chemistry, Oxford Road, University of Manchester, Manchester, M13 9PL, United Kingdom
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13
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Mao H, You BX, Zhou LJ, Xie TT, Wen YH, Lv X, Wang XX. SmI2-mediated reductive cyclization of β-arylthio ketones: a facile and diastereoselective synthesis of thiochroman derivatives. Org Biomol Chem 2017; 15:6157-6166. [DOI: 10.1039/c7ob01082f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
SmI2-mediated reductive cyclization of β-arylthio ketones afforded a general approach to dihydrothiochroman-ols in good yields and high degrees of diastereoselectivity.
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Affiliation(s)
- Hui Mao
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Bing-Xin You
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Lie-Jin Zhou
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Ting-Ting Xie
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Yi-Hang Wen
- 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
| | - Xiao-Xia 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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Huang HM, Bonilla P, Procter DJ. Selective construction of quaternary stereocentres in radical cyclisation cascades triggered by electron-transfer reduction of amide-type carbonyls. Org Biomol Chem 2017; 15:4159-4164. [DOI: 10.1039/c7ob00739f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Radical cyclisation cascades triggered by electron-transfer to amide-type carbonyls using SmI2–H2O–LiBr, result in the selective construction of quaternary carbon stereocentres.
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Affiliation(s)
| | - Pablo Bonilla
- School of Chemistry
- University of Manchester
- Manchester
- UK
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15
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Chciuk TV, Li AM, Vazquez-Lopez A, Anderson WR, Flowers RA. Secondary Amides as Hydrogen Atom Transfer Promoters for Reactions of Samarium Diiodide. Org Lett 2016; 19:290-293. [PMID: 28001419 DOI: 10.1021/acs.orglett.6b03664] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Two secondary amides (N-methylacetamide and 2-pyrrolidinone) were used as additives with SmI2 in THF to estimate the extent of N-H bond weakening upon coordination. Mechanistic and synthetic studies demonstrate significant bond-weakening, providing a reagent system capable of reducing a range of substrates through formal hydrogen atom transfer.
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Affiliation(s)
- Tesia V Chciuk
- Department of Chemistry, Lehigh University , 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
| | - Anna M Li
- Department of Chemistry, Lehigh University , 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
| | - Andres Vazquez-Lopez
- Department of Chemistry, Lehigh University , 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
| | - William R Anderson
- Department of Chemistry, Lehigh University , 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
| | - Robert A Flowers
- Department of Chemistry, Lehigh University , 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
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16
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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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17
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Just-Baringo X, Clark J, Gutmann MJ, Procter DJ. Selective Synthesis of Cyclooctanoids by Radical Cyclization of Seven-Membered Lactones: Neutron Diffraction Study of the Stereoselective Deuteration of a Chiral Organosamarium Intermediate. Angew Chem Int Ed Engl 2016; 55:12499-502. [PMID: 27600354 PMCID: PMC5113801 DOI: 10.1002/anie.201606792] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Indexed: 11/09/2022]
Abstract
Seven-membered lactones undergo selective SmI2 -H2 O-promoted radical cyclization to form substituted cyclooctanols. The products arise from an exo-mode of cyclization rather than the usual endo-attack employed in the few radical syntheses of cyclooctanes. The process is terminated by the quenching of a chiral benzylic samarium. A labeling experiment and neutron diffraction study have been used for the first time to probe the configuration and highly diastereoselective deuteration of a chiral organosamarium intermediate.
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Affiliation(s)
| | - Jemma Clark
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
| | - Matthias J Gutmann
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK
| | - David J Procter
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK.
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