1
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Seebacher W, Hoffelner M, Belaj F, Pirker T, Alajlani M, Bauer R, Pferschy-Wenzig EM, Saf R, Weis R. Formation of 5-Aminomethyl-2,3-dihydropyridine-4(1 H)-ones from 4-Amino-tetrahydropyridinylidene Salts. Molecules 2023; 28:6869. [PMID: 37836712 PMCID: PMC10574582 DOI: 10.3390/molecules28196869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 09/25/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023] Open
Abstract
Various 4-aminotetrahydropyridinylidene salts were treated with aldehydes in an alkaline medium. Their conversion to 5-substituted β-hydroxyketones in a one-step reaction succeeded only with an aliphatic aldehyde. Instead, aromatic aldehydes gave 5-substituted β-aminoketones or a single δ-diketone. The new compounds were characterized using spectroscopic methods and a single crystal structure analysis. Some of them showed anticancer and antibacterial properties.
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Affiliation(s)
- Werner Seebacher
- Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, University of Graz, Schubertstrasse 1, 8010 Graz, Austria
| | - Michael Hoffelner
- Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, University of Graz, Schubertstrasse 1, 8010 Graz, Austria
| | - Ferdinand Belaj
- Institute of Chemistry, University of Graz, Schubertstrasse 1, 8010 Graz, Austria
| | - Teresa Pirker
- Pharmacognosy, Institute for Pharmaceutical Sciences, University of Graz, Beethovenstrasse 8, 8010 Graz, Austria (R.B.)
| | - Muaaz Alajlani
- Faculty of Pharmacy, Al-Sham Private University, 011 Damascus, Syria
| | - Rudolf Bauer
- Pharmacognosy, Institute for Pharmaceutical Sciences, University of Graz, Beethovenstrasse 8, 8010 Graz, Austria (R.B.)
| | - Eva-Maria Pferschy-Wenzig
- Pharmacognosy, Institute for Pharmaceutical Sciences, University of Graz, Beethovenstrasse 8, 8010 Graz, Austria (R.B.)
| | - Robert Saf
- Institute for Chemistry and Technology of Materials (ICTM), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Robert Weis
- Pharmaceutical Chemistry, Institute of Pharmaceutical Sciences, University of Graz, Schubertstrasse 1, 8010 Graz, Austria
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2
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Osswald U, Boneberg J, Wittmann V. Photoswitching Affinity and Mechanism of Multivalent Lectin Ligands. Chemistry 2022; 28:e202200267. [PMID: 35286724 PMCID: PMC9325471 DOI: 10.1002/chem.202200267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Indexed: 11/09/2022]
Abstract
Multivalent receptor–ligand binding is a key principle in a plethora of biological recognition processes. Immense binding affinities can be achieved with the correct spatial orientation of the ligands. Accordingly, the incorporation of photoswitches, which can be used to reversibly change the spatial orientation of molecules, into multivalent ligands is a means to alter the binding affinity and possibly also the binding mode of such ligands. We report a divalent ligand for the model lectin wheat germ agglutinin (WGA) containing an arylazopyrazole photoswitch. This switch, which has recently been introduced as an alternative to the more commonly used azobenzene moiety, is characterized by almost quantitative E/Z photoswitching in both directions, high quantum yields, and high thermal stability of the Z isomer. The ligand was designed in a way that only one of the isomers is able to bridge adjacent binding sites of WGA leading to a chelating binding mode. Photoswitching induces an unprecedentedly high change in lectin binding affinity as determined by isothermal titration calorimetry (ITC). Furthermore, additional dynamic light scattering (DLS) data suggest that the binding mode of the ligand changes from chelating binding of the E isomer to crosslinking binding of the Z isomer.
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Affiliation(s)
- Uwe Osswald
- Department of ChemistryUniversity of Konstanz78457KonstanzGermany
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3
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Smolobochkin AV, Gazizov AS, Burilov AR, Pudovik MA. Norhygrine Alkaloid and Its Derivatives: Synthetic Approaches and Applications to the Natural Products Synthesis. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andrey V. Smolobochkin
- Arbuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific Center Russian Academy of Sciences Arbuzova str. 8 420088 Kazan Russian Federation
| | - Almir S. Gazizov
- Arbuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific Center Russian Academy of Sciences Arbuzova str. 8 420088 Kazan Russian Federation
| | - Alexander R. Burilov
- Arbuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific Center Russian Academy of Sciences Arbuzova str. 8 420088 Kazan Russian Federation
| | - Michail A. Pudovik
- Arbuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific Center Russian Academy of Sciences Arbuzova str. 8 420088 Kazan Russian Federation
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4
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Stojanović M, Bugarski S, Baranac-Stojanović M. Synthesis of 2,3-Dihydro-4-pyridones and 4-Pyridones by the Cyclization Reaction of Ester-Tethered Enaminones. J Org Chem 2020; 85:13495-13507. [PMID: 33092340 DOI: 10.1021/acs.joc.0c01537] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
2,3-Dihydro-4-pyridone skeleton is an important building block in organic synthesis because it features several reaction sites with nucleophilic or electrophilic properties. Herein, we disclose a method for its formation by intramolecular cyclization of ester-tethered enaminones, which can easily be synthesized from readily available materials, such as amines, activated alkynes, and activated alkenes. 2,3-Dihydro-4-pyridones have been isolated in 41-90% yields. We also demonstrate the transformation of these heterocycles into another important class of compounds, 4-pyridones, by utilizing 2,3,5,6-tetrachloro-p-benzoquinone (chloranil) as an oxidizing agent. The latter products were isolated in 65-94% yields.
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Affiliation(s)
- Milovan Stojanović
- University of Belgrade, Institute of Chemistry, Technology and Metallurgy-Center for Chemistry, Njegoševa 12, P.O. Box 473, 11000 Belgrade, Serbia
| | - Slobodan Bugarski
- University of Belgrade-Faculty of Chemistry, Studentski trg 12-16, P.O. Box 158, 11000 Belgrade, Serbia
| | - Marija Baranac-Stojanović
- University of Belgrade-Faculty of Chemistry, Studentski trg 12-16, P.O. Box 158, 11000 Belgrade, Serbia
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5
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Wang D, Shi H. An Unexpected Reaction of Isodehydracetic Acid with Amines in the Presence of 1-Ethyl-3-(3-dimethylaminopropyl) Carbodiimide Hydrochloride Yields a New Type of β-Enaminones. Molecules 2020; 25:molecules25092131. [PMID: 32370124 PMCID: PMC7249165 DOI: 10.3390/molecules25092131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 04/21/2020] [Accepted: 05/01/2020] [Indexed: 12/03/2022] Open
Abstract
The reaction of isodehydracetic acid with amines was serendipitously found to afford β-enaminones in the presence of the coupling agent 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC). Under the optimal reaction condition, 23 examples of α-aminomethylene glutaconic anhydride were obtained at approximately 30−80% yields. This is a concise, operationally simple method to expediently synthesize a new type of β-enaminone-containing compound.
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Affiliation(s)
- Delong Wang
- Department of Pharmaceutical Engineering, Shanxi Agricultural University, Taigu 030801, China
- Correspondence: ; Tel.: +86-354-6286398
| | - Hui Shi
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
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6
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Reddy PO, Reddy AA, Prasad KR. Stereoselective Synthesis of β-Amino Ynones by the Addition of Alkynones to Nonracemic Sulfinimines: Formal Total Synthesis of l- Xylo and l- Arabino Phytosphingosines. J Org Chem 2020; 85:2743-2751. [PMID: 31913627 DOI: 10.1021/acs.joc.9b02938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The addition of silyl enol ethers obtained from ynones to sulfinimines furnished the corresponding β-sulfinamido ynones in a very good yield and diastereoselectivity. The formed ynones serve as precursors amenable for the synthesis of bioactive compounds. This has been illustrated in the synthesis of l-xylo and l-arabino phytosphingosines.
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Affiliation(s)
- Polimera Obula Reddy
- Department of Organic Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - Arava Amaranadha Reddy
- Department of Organic Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - Kavirayani R Prasad
- Department of Organic Chemistry , Indian Institute of Science , Bangalore 560012 , India
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7
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Albano G, Interlandi S, Evangelisti C, Aronica LA. Polyvinylpyridine-Supported Palladium Nanoparticles: A Valuable Catalyst for the Synthesis of Alkynyl Ketones via Acyl Sonogashira Reactions. Catal Letters 2019. [DOI: 10.1007/s10562-019-02959-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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8
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Affiliation(s)
- Carmen Nájera
- Centro de Innovación en Química Avanzada (ORFEO−CINQA), Universidad de Alicante, Apdo. 99, Alicante E-03080, Spain
| | - Leiv K. Sydnes
- Department of Chemistry, University of Bergen, Allégt. 41, Bergen NO-5007, Norway
| | - Miguel Yus
- Centro de Innovación en Química Avanzada (ORFEO−CINQA), Universidad de Alicante, Apdo. 99, Alicante E-03080, Spain
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9
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Sevenich A, Mark PS, Behrendt T, Groß J, Opatz T. Synthesis of 2,3-Dihydro-4-pyridones, 4-Quinolones, and 2,3-Dihydro-4-azocinones by Visible-Light Photocatalytic Aerobic Dehydrogenation. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900584] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Adrian Sevenich
- Institute of Organic Chemistry; Johannes Gutenberg University; Duesbergweg 10-14 55128 Mainz Germany
| | - Paulina Sophie Mark
- Institute of Organic Chemistry; Johannes Gutenberg University; Duesbergweg 10-14 55128 Mainz Germany
| | - Torsten Behrendt
- Institute of Organic Chemistry; Johannes Gutenberg University; Duesbergweg 10-14 55128 Mainz Germany
| | - Jonathan Groß
- Institute of Organic Chemistry; Johannes Gutenberg University; Duesbergweg 10-14 55128 Mainz Germany
| | - Till Opatz
- Institute of Organic Chemistry; Johannes Gutenberg University; Duesbergweg 10-14 55128 Mainz Germany
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10
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Ho HE, James MJ, O’Brien P, Taylor RJK, Unsworth WP. Ag(I)-Catalyzed Synthesis of Azabicyclic Alkaloid Frameworks from Ketimine-Tethered Ynones: Total Synthesis of Indolizidine 209D. Org Lett 2018; 20:1439-1443. [DOI: 10.1021/acs.orglett.8b00225] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hon Eong Ho
- Department of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Michael J. James
- Department of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Peter O’Brien
- Department of Chemistry, University of York, Heslington, York YO10
5DD, U.K
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11
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Gu X, Gupta V, Yang Y, Zhu JY, Carlson EJ, Kingsley C, Tash JS, Schönbrunn E, Hawkinson J, Georg GI. Structure-Activity Studies of N-Butyl-1-deoxynojirimycin (NB-DNJ) Analogues: Discovery of Potent and Selective Aminocyclopentitol Inhibitors of GBA1 and GBA2. ChemMedChem 2017; 12:1977-1984. [PMID: 28975712 PMCID: PMC5725710 DOI: 10.1002/cmdc.201700558] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Indexed: 12/26/2022]
Abstract
Analogues of N‐butyl‐1‐deoxynojirimycin (NB‐DNJ) were prepared and assayed for inhibition of ceramide‐specific glucosyltransferase (CGT), non‐lysosomal β‐glucosidase 2 (GBA2) and the lysosomal β‐glucosidase 1 (GBA1). Compounds 5 a–6 f, which carry sterically demanding nitrogen substituents, and compound 13, devoid of the C3 and C5 hydroxy groups present in DNJ/NB‐DGJ (N‐butyldeoxygalactojirimycin) showed no inhibitory activity for CGT or GBA2. Inversion of stereochemistry at C4 of N‐(n‐butyl)‐ and N‐(n‐nonyl)‐DGJ (compounds 24) also led to a loss of activity in these assays. The aminocyclopentitols N‐(n‐butyl)‐ (35 a), N‐(n‐nonyl)‐4‐amino‐5‐(hydroxymethyl)cyclopentane‐ (35 b), and N‐(1‐(pentyloxy)methyl)adamantan‐1‐yl)‐1,2,3‐triol (35 f), were found to be selective inhibitors of GBA1 and GBA2 that did not inhibit CGT (>1 mm), with the exception of 35 f, which inhibited CGT with an IC50 value of 1 mm. The N‐butyl analogue 35 a was 100‐fold selective for inhibiting GBA1 over GBA2 (Ki values of 32 nm and 3.3 μm for GBA1 and GBA2, respectively). The N‐nonyl analogue 35 b displayed a Ki value of ≪14 nm for GBA1 inhibition and a Ki of 43 nm for GBA2. The N‐(1‐(pentyloxy)methyl)adamantan‐1‐yl) derivative 35 f had Ki values of ≈16 and 14 nm for GBA1 and GBA2, respectively. The related N‐bis‐substituted aminocyclopentitols were found to be significantly less potent inhibitors than their mono‐substituted analogues. The aminocyclopentitol scaffold should hold promise for further inhibitor development.
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Affiliation(s)
- Xingxian Gu
- Department of Medicinal Chemistry, University of Kansas, Lawrence, KS, 66045, USA.,Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, MN, 55414, USA
| | | | - Yan Yang
- H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL, 33612, USA
| | - Jin-Yi Zhu
- H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL, 33612, USA
| | - Erick J Carlson
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, MN, 55414, USA
| | - Carolyn Kingsley
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, MN, 55414, USA
| | - Joseph S Tash
- University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Ernst Schönbrunn
- H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL, 33612, USA
| | - Jon Hawkinson
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, MN, 55414, USA
| | - Gunda I Georg
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, MN, 55414, USA
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12
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Yu Y, Humeidi R, Alleyn JR, Doyle MP. Catalytic Allylic Oxidation of Cyclic Enamides and 3,4-Dihydro-2H-Pyrans by TBHP. J Org Chem 2017; 82:8506-8513. [PMID: 28723085 DOI: 10.1021/acs.joc.7b01163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allylic oxidation of heteroatom substituted cyclic alkenes by tert-butyl hydroperoxide (70% TBHP in water) using catalytic dirhodium caprolactamate [Rh2(cap)4] forms enone products with a variety of 2-substituted cyclic enamides and 3,4-dihyro-2H-pyrans. These reactions occur under mild reaction conditions, are operationally convenient to execute, and are effective for product formation with as low as 0.25 mol% catalyst loading. With heteroatom stabilization of the intermediate allylic free radical two sites for oxidative product formation are possible, and the selectivity of the oxidative process varies with the heteroatom when R = H. Cyclic enamides produce 4-piperidones in good yields when R = alkyl or aryl, but oxidation of 2H-pyrans also gives alkyl cleavage products. Alternative catalysts for TBHP oxidations show comparable selectivities but give lower product yields.
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Affiliation(s)
- Yang Yu
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Ranad Humeidi
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - James R Alleyn
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
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13
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Eiden CG, Aldrich CC. Synthesis of a 3-Amino-2,3-dihydropyrid-4-one and Related Heterocyclic Analogues as Mechanism-Based Inhibitors of BioA, a Pyridoxal Phosphate-Dependent Enzyme. J Org Chem 2017; 82:7806-7819. [PMID: 28682613 DOI: 10.1021/acs.joc.7b00847] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Amiclenomycin (ACM) is a chemically unstable antibiotic with selective activity against Mycobacterium tuberculosis (Mtb) due to mechanism-based inhibition of BioA, a pyridoxal 5'-phosphate (PLP)-dependent aminotransferase. The first-generation ACM analogue dihydro-2-pyridone 1 maintains a similar bioactivation mechanism concluding with covalent labeling of the PLP cofactor. To improve on 1, we report the synthesis of dihydro-4-pyranone 2, dihydro-4-pyridone 3, and dihydro-4-thiopyranone 13, which were rationally designed to boost the rate of enzyme inactivation by lowering the pKa of their α-protons. We employed a unified synthetic strategy for construction of the desired heterocycles featuring α-amino ynone generation followed by 6-endo-dig cyclization. However, competitive 5-exo-dig cyclization, β-elimination of the ynone, and dimerization of the resultant α-amino carbonyls all complicated the syntheses of the dihydro-4-pyranone and dihydro-4-pyridone scaffolds. These obstacles were overcome by Teoc protection of the β-amino group in the assembly of 3 and Boc-MOM protection of the α-amino group in the synthesis of 2, enabling the efficient construction of 2 and 3 in seven steps from commercially available starting materials. Dihydro-4-pyridone 3 possessed improved enzyme inhibition as measured by its kinact value against BioA.
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Affiliation(s)
- Carter G Eiden
- Department of Medicinal Chemistry, University of Minnesota , 308 Harvard Street SE, 8-174 WDH, Minneapolis, Minnesota 55455, United States
| | - Courtney C Aldrich
- Department of Medicinal Chemistry, University of Minnesota , 308 Harvard Street SE, 8-174 WDH, Minneapolis, Minnesota 55455, United States
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14
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Chattopadhyay AK, Hanessian S. Recent Progress in the Chemistry of Daphniphyllum Alkaloids †. Chem Rev 2017; 117:4104-4146. [PMID: 28205435 DOI: 10.1021/acs.chemrev.6b00412] [Citation(s) in RCA: 112] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Daphniphyllum is an evergreen species known since 1826. After initial systematic investigations, more than 320 members of this family have been isolated, which comprise complex and fascinating structures. Unique azapolycyclic architectures containing one or more quaternary stereocenters render these alkaloids synthetically challenging. This review covers efforts toward the synthesis of Daphniphyllum alkaloids spanning the period from 2005 to the beginning of 2016, including reported biological activities as well as the isolation of new members of this genus.
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Affiliation(s)
- Amit Kumar Chattopadhyay
- Department of Chemistry, Université de Montréal , Post Office Box 6128, Station Centre Ville, Montreal, Quebec H3C 3J7, Canada
| | - Stephen Hanessian
- Department of Chemistry, Université de Montréal , Post Office Box 6128, Station Centre Ville, Montreal, Quebec H3C 3J7, Canada
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15
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Vu HD, Renault J, Roisnel T, Gouault N, Uriac P. Synthesis of 3-substituted indolizidines from amino-ynones derivatives. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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16
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Chattopadhyay AK, Hanessian S. Cyclic enaminones. Part I: stereocontrolled synthesis using diastereoselective and catalytic asymmetric methods. Chem Commun (Camb) 2016; 51:16437-49. [PMID: 26490402 DOI: 10.1039/c5cc05891k] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclic enaminones are versatile intermediates to construct a variety of azacyclic frameworks and have been widely used in alkaloid synthesis. Here, we summarize three approaches for stereoselective syntheses of cyclic enaminones and their functionalized derivatives. These include chiral substrates (chirons) as starting materials, syntheses employing non-catalytic (stoichiometric) reagents, and catalytic asymmetric methods.
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Affiliation(s)
- Amit Kumar Chattopadhyay
- Department of Chemistry, Université de Montréal, Station Centre Ville, C.P. 6128, Montreal, QC H3C 3J7, Canada.
| | - Stephen Hanessian
- Department of Chemistry, Université de Montréal, Station Centre Ville, C.P. 6128, Montreal, QC H3C 3J7, Canada.
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17
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Chattopadhyay AK, Ly VL, Jakkepally S, Berger G, Hanessian S. Total Synthesis of Isodaphlongamine H: A Possible Biogenetic Conundrum. Angew Chem Int Ed Engl 2016; 55:2577-81. [DOI: 10.1002/anie.201510861] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Amit Kumar Chattopadhyay
- Department of Chemistry; Université de Montréal; Station Centre Ville, C.P. 6128 Montréal Qc H3C 3J7 Canada
| | - Vu Linh Ly
- Department of Chemistry; Université de Montréal; Station Centre Ville, C.P. 6128 Montréal Qc H3C 3J7 Canada
| | - Shashidhar Jakkepally
- Department of Chemistry; Université de Montréal; Station Centre Ville, C.P. 6128 Montréal Qc H3C 3J7 Canada
| | - Gilles Berger
- Department of Chemistry; Université de Montréal; Station Centre Ville, C.P. 6128 Montréal Qc H3C 3J7 Canada
| | - Stephen Hanessian
- Department of Chemistry; Université de Montréal; Station Centre Ville, C.P. 6128 Montréal Qc H3C 3J7 Canada
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18
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19
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Kang YW, Cho YJ, Han SJ, Jang HY. Tunable and Diastereoselective Brønsted Acid Catalyzed Synthesis of β-Enaminones. Org Lett 2016; 18:272-5. [DOI: 10.1021/acs.orglett.5b03445] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Ye-Won Kang
- Department
of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - Yu Jin Cho
- Department
of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - Seung Jin Han
- Department
of Energy Systems Research, Ajou University, Suwon 443-749, Korea
| | - Hye-Young Jang
- Department
of Energy Systems Research, Ajou University, Suwon 443-749, Korea
- Korea Carbon Capture & Sequestration R&D Center, Deajeon 305-343, Korea
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20
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Braunstein H, Langevin S, Khim M, Adamson J, Hovenkotter K, Kotlarz L, Mansker B, Beng TK. Modular access to vicinally functionalized allylic (thio)morpholinonates and piperidinonates by substrate-controlled annulation of 1,3-azadienes with hexacyclic anhydrides. Org Biomol Chem 2016; 14:8864-8872. [PMID: 27714224 DOI: 10.1039/c6ob01526c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A modular substrate-controlled hexannulation of 1,3-azadienes with hexacyclic anhydrides, which affords versatile vicinally functionalized allylic lactams, in high yields, regio- and stereoselectivities is described.
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Affiliation(s)
| | - Spencer Langevin
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Monique Khim
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Jonathan Adamson
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | | | - Lindsey Kotlarz
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Brandon Mansker
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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21
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Enamorado MF, Connelly CM, Deiters A, Comins DL. A concise synthesis of the Lycopodium alkaloid cermizine D. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Cobalt-catalyzed arylation and alkenylation of alpha-bromo eneformamides and enecarbamates by cross-coupling with organic bromides: Application to the synthesis of functionalized piperidines and azepanes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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Brockmeyer F, Morosow V, Martens J. A new multicomponent reaction: unexpected formation of derivatizable cyclic α-alkoxy isothioureas. Org Biomol Chem 2015; 13:3341-6. [DOI: 10.1039/c4ob02608j] [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
With the aid of an unexpected new multicomponent reaction 2,5-dihydro-1,3-thiazole S-monoxides can be converted to cyclic α-alkoxy isothioureas. In addition, an observed rearrangement of subsequently acylated isothioureas is described.
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Affiliation(s)
- Fabian Brockmeyer
- Institut für Chemie
- Carl von Ossietzky Universität Oldenburg
- 26111 Oldenburg
- Germany
| | - Valentin Morosow
- Institut für Chemie
- Carl von Ossietzky Universität Oldenburg
- 26111 Oldenburg
- Germany
| | - Jürgen Martens
- Institut für Chemie
- Carl von Ossietzky Universität Oldenburg
- 26111 Oldenburg
- Germany
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24
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Yang Y. Building polyfunctional piperidines: a stereoselective strategy of a three-component Mannich reaction inspired by biosynthesis and applications in the synthesis of natural alkaloids (+)-241D; (−)-241D; isosolenopsin A and (−)-epimyrtine. RSC Adv 2015. [DOI: 10.1039/c4ra14418j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A stereoselective strategy for building polyfunctional piperidines by a three-component Mannich reaction and applications in the stereoselective synthesis of natural alkaloids.
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Affiliation(s)
- Yang Yang
- Genomics Institute of the Novartis Research Foundation
- San Diego
- USA
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25
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26
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Vu HD, Renault J, Roisnel T, Gouault N, Uriac P. Methanesulfonic Acid Mediated Cyclization and Meyer-Schuster Rearrangement of γ-Amino-ynones: Access to Enantiopure Pyrrolidine Exocyclic Vinylogous Amides. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402336] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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27
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Seki H, Georg GI. Enantiospecific Synthesis and Biological Investigations of a Nuphar Alkaloid: Proposed Structure of a Castoreum Component. European J Org Chem 2014; 2014:3777-3783. [PMID: 25395879 DOI: 10.1002/ejoc.201402232] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An enantiospecific synthesis of a Nuphar alkaloid was achieved in 9 steps from N-Boc-(L)-proline. The alkaloid is a minor component of castoreum, the dried scent glands of the beaver. During the course of our study, the stereochemistry of three synthetic intermediates was verified by X-ray analysis, which contributes to resolving existing discrepancies among the literature reports regarding the synthesis of this particular compound. Based on our synthesis, we propose the structure of the natural product. Also, intrigued by castoreum's therapeutic effect, which was used in ancient Greece and Rome for gynecological and other purposes, biological screening was conducted. We found that the alkaloid has affinity for the oxytocin receptor.
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Affiliation(s)
- Hajime Seki
- Departments of Chemistry and Medicinal Chemistry, Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware St. SE, Minneapolis MN 55414 U.S.A
| | - Gunda I Georg
- Departments of Chemistry and Medicinal Chemistry, Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware St. SE, Minneapolis MN 55414 U.S.A
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28
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Lei BL, Zhang QS, Yu WH, Ding QP, Ding CH, Hou XL. Kinetic Resolution of 2-Substituted 2,3-Dihydro-4-pyridones by Palladium-Catalyzed Asymmetric Allylic Alkylation: Catalytic Asymmetric Total Synthesis of Indolizidine (−)-209I. Org Lett 2014; 16:1944-7. [DOI: 10.1021/ol500498m] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
| | | | - Wei-Hua Yu
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, 99
Ziyang Road, Nanchang 330022, China
| | - Qiu-Ping Ding
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, 99
Ziyang Road, Nanchang 330022, China
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29
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Steponavičiūtė R, Martynaitis V, Bieliauskas A, Šačkus A. Synthesis of new fluorescent building blocks via the microwave-assisted annulation reaction of 1,1,2-trimethyl-1H-benzo[e]indole with acrylic acid and its derivatives. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.01.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Ranade A, Georg GI. Enantioselective synthesis of 3,4-dihydro-1,2-oxazepin-5(2H)-ones and 2,3-dihydropyridin-4(1H)-ones from β-substituted β-hydroxyaminoaldehydes. J Org Chem 2014; 79:984-92. [PMID: 24785413 PMCID: PMC3985460 DOI: 10.1021/jo402445r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Indexed: 12/12/2022]
Abstract
The synthesis of 3,4-dihydro-1,2-oxazepin-5(2H)-ones and 2,3-dihydropyridin-4(1H)-ones from β-substituted β-hydroxyaminoaldehydes is reported. The β-hydroxyaminoaldehydes were prepared by enantioselective organocatalytic 1,4-addition of N-tert-butyl (tert-butyldimethylsilyl)oxycarbamate to α,β-unsaturated aldehydes (MacMillan protocol). Alkyne addition to the aldehydes followed by alcohol oxidation furnished N-Boc O-TBS-protected β-aminoynones. Removal of the TBS protecting group initiated a 7-endo-dig cyclization to yield previously unknown 3,4-dihydro-1,2-oxazepin-5(2H)-ones. Reductive cleavage of the N-O bond of the oxazepinones and Boc-deprotection provided 2-substituted 2,3-dihydropyridin-4(1H)-ones via 6-endo-trig cyclization. 2,3-Dihydropyridin-4(1H)-ones are versatile intermediates that have been used for the synthesis of many alkaloids. The new protocol allows the synthesis of 3-dihydropyridin-4(1H)-ones carrying an array of substituents at C2 that cannot be prepared from commercial β-amino acids or by one-carbon homologation of proteinogenic amino acids. The use of readily available β-hydroxylaminoaldehydes expands the utility of our previously reported method to prepare 2,3-dihydropyridin-4(1H)-ones from β-amino acids as the source of diversity and chirality. A broad substrate scope is possible because β-aminoaldehydes can be prepared from α,β-unsaturated aldehydes by an enantioselective organocatalytic process.
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Affiliation(s)
- Adwait
R. Ranade
- University
of Kansas, 1251 Wescoe
Hall Drive, 4070 Malott
Hall, Lawrence, Kansas 66045-7482, United States
- Department of Medicinal
Chemistry
and Institute for Therapeutics Discovery & Development, University of Minnesota, 717 Delaware Street South East, Minneapolis, Minnesota 55414, United States
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31
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Yoshida M, Kinoshita K, Namba K. Synthesis of functionalized 2-vinyl-2,3-dihydropyrroles and 3-methylene-1,2,3,4-tetrahydropyridines by palladium-catalyzed cyclization of β-enaminocarbonyl compounds with allylic bisacetates. Org Biomol Chem 2014; 12:2394-403. [DOI: 10.1039/c3ob42510j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Palladium-catalyzed reactions of β-enaminocarbonyl compounds with 1,4-diacetoxybut-2-ene and 2-methylene-1,3-propanediol diacetate are described.
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Affiliation(s)
- Masahiro Yoshida
- Graduate School of Pharmaceutical Sciences
- The University of Tokushima
- Tokushima 770-8505, Japan
| | - Kouki Kinoshita
- Graduate School of Pharmaceutical Sciences
- The University of Tokushima
- Tokushima 770-8505, Japan
| | - Kosuke Namba
- Graduate School of Pharmaceutical Sciences
- The University of Tokushima
- Tokushima 770-8505, Japan
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32
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Facile and efficient addition of terminal alkynes to benzotriazole esters: synthesis of d-erythro-sphingosine using ynones as the key intermediate. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.10.082] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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33
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Brimioulle R, Bach T. Enantioselective Lewis Acid Catalysis of Intramolecular Enone [2+2] Photocycloaddition Reactions. Science 2013; 342:840-3. [DOI: 10.1126/science.1244809] [Citation(s) in RCA: 241] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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34
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Lei CH, Wang DX, Zhao L, Zhu J, Wang MX. Synthesis of Multifunctionalized 1,2,3,4-Tetrahydropyridines, 2,3-Dihydropyridin-4(1H)-ones, and Pyridines from Tandem Reactions Initiated by [5+1] Cycloaddition of N-Formylmethyl-Substituted Enamides to Isocyanides: Mechanistic Insight and Synthetic Appl. Chemistry 2013; 19:16981-7. [DOI: 10.1002/chem.201303221] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Indexed: 11/06/2022]
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35
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Vu HD, Renault J, Toupet L, Uriac P, Gouault N. From Aspartic Acid to Dihydropyridone-2-carboxylates: Access to Enantiopure 6-Substituted 4-Oxo- and 4-Hydroxypipecolic Acid Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300812] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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36
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Nguyen KH, Tomasi S, Le Roch M, Toupet L, Renault J, Uriac P, Gouault N. Gold-Mediated Synthesis and Functionalization of Chiral Halopyridones. J Org Chem 2013; 78:7809-15. [DOI: 10.1021/jo400827b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Khanh Hung Nguyen
- Equipe PNSCM, UMR 6226, Université de Rennes 1, 2 avenue du Pr. Léon
Bernard 35043 Rennes Cedex, France
| | - Sophie Tomasi
- Equipe PNSCM, UMR 6226, Université de Rennes 1, 2 avenue du Pr. Léon
Bernard 35043 Rennes Cedex, France
| | - Myriam Le Roch
- Equipe PNSCM, UMR 6226, Université de Rennes 1, 2 avenue du Pr. Léon
Bernard 35043 Rennes Cedex, France
| | - Loïc Toupet
- IPR, UMR 6251, Institut de Physique
de Rennes, Université de Rennes 1, 263 avenue du général Leclerc, 35042 Rennes Cedex,
France
| | - Jacques Renault
- Equipe PNSCM, UMR 6226, Université de Rennes 1, 2 avenue du Pr. Léon
Bernard 35043 Rennes Cedex, France
| | - Philippe Uriac
- Equipe PNSCM, UMR 6226, Université de Rennes 1, 2 avenue du Pr. Léon
Bernard 35043 Rennes Cedex, France
| | - Nicolas Gouault
- Equipe PNSCM, UMR 6226, Université de Rennes 1, 2 avenue du Pr. Léon
Bernard 35043 Rennes Cedex, France
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37
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Glotova TE, Dvorko MY, Ushakov IA, Shabalin DA, Schmidt EY, Trofimov BA. Modification of g-Aminobutyric Acid with Acylacetylenes: Stereoselective C-Vinylation of the Primary Adducts and Transformation to Acylpyridines. MENDELEEV COMMUNICATIONS 2012. [DOI: 10.1016/j.mencom.2012.11.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Kim YW, Niphakis MJ, Georg GI. Copper-assisted palladium(II)-catalyzed direct arylation of cyclic enaminones with arylboronic acids. J Org Chem 2012; 77:9496-503. [PMID: 23088256 DOI: 10.1021/jo301531k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Described herein is a palladium(II)-catalyzed direct arylation of cyclic enaminones with arylboronic acids. The versatility of this method is that both electron-rich and electron-poor boronic acids can be coupled in high yields. A mixture of two Cu(II) additives was crucial for efficient cross-coupling. The role of each Cu(II) reagent appears to be distinct and complementary serving to assist catalyst reoxidation and transmetalation through a putative arylcopper intermediate.
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Affiliation(s)
- Yong Wook Kim
- Department of Chemistry, and the Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414, United States
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39
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Shao J, Yang JS. A Diastereoselective Cyclic Imine Cycloaddition Strategy To Access Polyhydroxylated Indolizidine Skeleton: Concise Syntheses of (+)-/(−)-Lentiginosines and (−)-2-epi-Steviamine. J Org Chem 2012; 77:7891-900. [PMID: 22946565 DOI: 10.1021/jo3010777] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jia Shao
- Key Laboratory of Drug Targeting, Ministry of Education,
and Department of Chemistry of Medicinal Natural Products, West China
School of Pharmacy, Sichuan University,
Chengdu 610041, P. R. China
| | - Jin-Song Yang
- Key Laboratory of Drug Targeting, Ministry of Education,
and Department of Chemistry of Medicinal Natural Products, West China
School of Pharmacy, Sichuan University,
Chengdu 610041, P. R. China
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40
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Eklund EJ, Pike RD, Scheerer JR. Synthesis of 1-aminopyrrolizidine alkaloid (−)-absouline by stereoselective aminoconjugate addition. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.06.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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41
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Chevalley A, Férézou JP. One-pot formation of aza-enolates from secondary amines and condensation to esters and alkyl bromides. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.04.105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Roehrs JA, Pistoia RP, Back DF, Zeni G. Three-Step One-Pot Synthesis of Imidazo[2,1-b]chalcogenazoles via Intramolecular Cyclization of N-Alkynylimidazoles. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200075] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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43
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Yu YY, Niphakis MJ, Georg GI. Palladium(II)-catalyzed dehydrogenative alkenylation of cyclic enaminones via the Fujiwara-Moritani reaction. Org Lett 2011; 13:5932-5. [PMID: 21995751 PMCID: PMC3235746 DOI: 10.1021/ol202677g] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A new Pd(II)-catalyzed dehydrogenative alkenylation reaction involving two alkenes was developed. A variety of nonaromatic, cyclic enaminones were successfully coupled to primary and secondary alkenes yielding a series of unique 1,3-dienes. The generality of this transformation presents a useful strategy for directly cross-coupling alkenes and offers an attractive new approach to functionalize enaminones.
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Affiliation(s)
- Yi-Yun Yu
- Department of Chemistry and Department of Medicinal Chemistry and the Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414
| | - Micah J. Niphakis
- Department of Chemistry and Department of Medicinal Chemistry and the Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414
| | - Gunda I. Georg
- Department of Chemistry and Department of Medicinal Chemistry and the Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414
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44
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Affiliation(s)
- Kiri Stevens
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and Pfizer Global Research and Development, Ramsgate Road, Sandwich CT13 9NJ, U.K
| | - Andrew J. Tyrrell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and Pfizer Global Research and Development, Ramsgate Road, Sandwich CT13 9NJ, U.K
| | - Sarah Skerratt
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and Pfizer Global Research and Development, Ramsgate Road, Sandwich CT13 9NJ, U.K
| | - Jeremy Robertson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and Pfizer Global Research and Development, Ramsgate Road, Sandwich CT13 9NJ, U.K
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45
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Bi L, Georg GI. Direct Hiyama cross-coupling of enaminones with triethoxy(aryl)silanes and dimethylphenylsilanol. Org Lett 2011; 13:5413-5. [PMID: 21939201 DOI: 10.1021/ol202202a] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
2,3-Dihydropyridin-4(1H)-ones undergo direct C-H functionalization at C5 in the palladium(II)-catalyzed Hiyama reaction, using triethoxy(aryl)silanes and dimethylphenylsilanol. The reagent CuF(2) has a dual role in the reactions with triethoxy(aryl)silanes. It is a source of fluoride to activate the silane in the Hiyama reaction and also serves as the reoxidant to convert Pd(0) to Pd(II) in the catalytic cycle.
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Affiliation(s)
- Lei Bi
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA
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46
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Gouault N, Le Roch M, Cheignon A, Uriac P, David M. Enantiospecific Synthesis of Pyridinones as Versatile Intermediates toward Asymmetric Piperidines. Org Lett 2011; 13:4371-3. [PMID: 21790147 DOI: 10.1021/ol201698m] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicolas Gouault
- Equipe Produits Naturels, Synthèse et Chimie Médicinale, UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1, 2 Avenue du Pr Léon Bernard 35043 Rennes Cedex, France
| | - Myriam Le Roch
- Equipe Produits Naturels, Synthèse et Chimie Médicinale, UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1, 2 Avenue du Pr Léon Bernard 35043 Rennes Cedex, France
| | - Adèle Cheignon
- Equipe Produits Naturels, Synthèse et Chimie Médicinale, UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1, 2 Avenue du Pr Léon Bernard 35043 Rennes Cedex, France
| | - Philippe Uriac
- Equipe Produits Naturels, Synthèse et Chimie Médicinale, UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1, 2 Avenue du Pr Léon Bernard 35043 Rennes Cedex, France
| | - Michèle David
- Equipe Produits Naturels, Synthèse et Chimie Médicinale, UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1, 2 Avenue du Pr Léon Bernard 35043 Rennes Cedex, France
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47
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Leighty MW, Georg GI. Total Syntheses and Cytotoxicity of (R)- and (S)-Boehmeriasin A. ACS Med Chem Lett 2011; 2:313-315. [PMID: 21779519 DOI: 10.1021/ml1003074] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Both enantiomers of boehmeriasin A were synthesized in seven steps each, using a chiral pool approach. Key steps in the synthesis are a one-flask, two-step protocol to generate the quinolizine core and a C-H functionalization reaction between tetrahydroquinolizinones and an aryltrifluoroborate. The natural product (R)-boehmeriasin A demonstrated potent cytotoxicity against several cancer cell lines, whereas the unnatural (+)-(S)-isomer was significantly less potent.
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Affiliation(s)
- Matthew W. Leighty
- Department of Medicinal Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Lawrence,
Kansas 66045, United States, and Department of Medicinal Chemistry
and The Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis,
Minnesota 55414, United States
| | - Gunda I. Georg
- Department of Medicinal Chemistry, The University of Kansas, 1251 Wescoe Hall Drive, Lawrence,
Kansas 66045, United States, and Department of Medicinal Chemistry
and The Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis,
Minnesota 55414, United States
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48
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Seki H, Georg GI. Three-component synthesis of cyclic enaminones via ketene cyclization. Org Lett 2011; 13:2147-9. [PMID: 21456588 DOI: 10.1021/ol200358h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cyclic six-membered enaminones were synthesized from three components (bromodiazoacetone, primary amine, and alkyne) in high yields via aza-Michael addition, Wolff rearrangement, and nucleophilic ketene cyclization.
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Affiliation(s)
- Hajime Seki
- Department of Chemistry, Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414, United States
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49
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Pepe A, Pamment M, Georg GI, Malhotra SV. Synthesis of Fused Bicyclic Systems with Nitrogen Atom at the Bridgehead, Including Indolizidines and Quinolizidines. J Org Chem 2011; 76:3527-30. [DOI: 10.1021/jo102558u] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antonella Pepe
- Laboratory of Synthetic Chemistry, SAIC-Frederick, Inc., National Cancer Institute at Frederick, 1050 Boyles Street, Frederick, Maryland 21702, United States
- Department of Medicinal Chemistry and the Institute of Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414, United States
| | - Michael Pamment
- Laboratory of Synthetic Chemistry, SAIC-Frederick, Inc., National Cancer Institute at Frederick, 1050 Boyles Street, Frederick, Maryland 21702, United States
| | - Gunda I. Georg
- Department of Medicinal Chemistry and the Institute of Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414, United States
| | - Sanjay V. Malhotra
- Laboratory of Synthetic Chemistry, SAIC-Frederick, Inc., National Cancer Institute at Frederick, 1050 Boyles Street, Frederick, Maryland 21702, United States
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50
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Seki H, Georg GI. Synthesis of amino acid derived enaminones via Wolff rearrangement using vinylogous amides as carbon nucleophiles. J Am Chem Soc 2011; 132:15512-3. [PMID: 20958040 DOI: 10.1021/ja107329k] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclic enaminones were synthesized in high yields from amino acids in two steps via Wolff rearrangement. The cyclization represents a rare 6-exo-dig cyclization involving a ketene as an electrophile. No racemization was observed during this reaction.
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Affiliation(s)
- Hajime Seki
- Department of Chemistry, Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414, USA
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