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Medina JT, Tran QH, Hughes RP, Wang X, Brookhart M, Daugulis O. Ethylene Polymerizations Catalyzed by Fluorinated "Sandwich" Diimine-Nickel and Palladium Complexes. J Am Chem Soc 2024; 146:15143-15154. [PMID: 38781282 DOI: 10.1021/jacs.4c01322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Nickel and palladium complexes bearing "sandwich" diimine ligands with perfluorinated aryl caps have been synthesized, characterized, and explored in ethylene polymerization reactions. The X-ray crystallographic analysis of the precatalysts 16 and 6b shows differences from their nonfluorinated analogues 17 and 19, with the perfluorinated aryl caps centered precisely over the nickel and palladium centers, which results in higher buried volumes of the metal centers relative to the nonfluorinated analogues. The sandwich diimine-palladium complexes 5a and 5b containing perfluorinated aryl caps polymerize ethylene in a controlled fashion with activities that are substantially increased compared with their nonfluorinated analogues. Migratory insertion rates in relevant methyl ethylene complexes agree with the activities exhibited in bulk polymerization experiments. DFT studies suggest that facility of ethylene rotation from its preferred orientation perpendicular to the Pd-alkyl bond into a parallel in-plane conformation contributes to the higher polymerization activity for 5b relative to 18a. For these palladium systems, polymer molecular weights can be controlled via hydrogen addition (hydrogenolysis), which is unusual for late-transition-metal-catalyzed olefin polymerizations with no catalyst deactivation occurring. Sandwich diimine-nickel complexes 6a and 6b with perfluorinated aryl caps show ethylene polymerization activities that are about half of those of classical tetraisopropyl-substituted catalyst 2 but again are more active than the analogous nonfluorinated sandwich complexes. Ethylene polymerizations exhibit living behavior, and branched ultrahigh-molecular-weight polyethylenes (UHMWPEs) with very low-molecular-weight distributions (less than 1.1) are obtained. The activated nickel catalysts are stable in the absence of monomer and show good long-term stability at 25 °C.
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Affiliation(s)
- Joseph T Medina
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Quan H Tran
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Russell P Hughes
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Xiqu Wang
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Maurice Brookhart
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Olafs Daugulis
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
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2
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3
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Sain S, Jain S, Srivastava M, Vishwakarma R, Dwivedi J. Application of Palladium-Catalyzed Cross-Coupling Reactions in Organic Synthesis. Curr Org Synth 2020; 16:1105-1142. [DOI: 10.2174/1570179416666191104093533] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 07/16/2019] [Accepted: 10/01/2019] [Indexed: 12/26/2022]
Abstract
:
Palladium-catalyzed cross-coupling reactions have gained a continuously growing
interest of synthetic organic chemists. The present review gives a brief account of applications of
the palladium-catalyzed cross-coupling reactions in comprehensive synthesis, viz., the Heck, Stille,
Suzuki–Miyaura, Negishi, Sonogashira, Buchwald–Hartwig, Ullmann and the Oxidative,
decarboxylative cross-coupling reactions, with particular emphasis on the synthesis of heterocyclic
compounds.
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Affiliation(s)
- Shalu Sain
- Department of Chemistry, Banasthali Vidyapith, Banasthali-304022, India
| | - Sonika Jain
- Department of Chemistry, Banasthali Vidyapith, Banasthali-304022, India
| | - Manish Srivastava
- Department of Chemistry, Banasthali Vidyapith, Banasthali-304022, India
| | | | - Jaya Dwivedi
- Department of Chemistry, Banasthali Vidyapith, Banasthali-304022, India
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4
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Sousa E Silva FC, Van NT, Wengryniuk SE. Direct C-H α-Arylation of Enones with ArI(O 2CR) 2 Reagents. J Am Chem Soc 2019; 142:64-69. [PMID: 31841623 DOI: 10.1021/jacs.9b11282] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
α-Arylation of α,β-unsaturated ketones constitutes a powerful synthetic transformation. It is most commonly achieved via cross-coupling of α-haloenones, but this stepwise strategy requires prefunctionalized substrates and expensive catalysts. Direct enone C-H α-arylation would offer an atom- and step-economical alternative, but such reports are scarce. Herein we report the metal-free direct C-H arylation of enones mediated by hypervalent iodine reagents. The reaction proceeds via a reductive iodonium Claisen rearrangement of in situ-generated β-pyridinium silyl enol ethers. The aryl groups are derived from ArI(O2CCF3)2 reagents, which are readily accessed from the parent iodoarenes. The reaction is tolerant of a wide range of substitution patterns, and the incorporated arenes maintain the valuable iodine functional handle. Mechanistic investigations implicate arylation via an umpoled "enolonium" species and show that the presence of a β-pyridinium moiety is critical for the desired C-C bond formation.
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Affiliation(s)
- Felipe Cesar Sousa E Silva
- Department of Chemistry , Temple University , 1901 North 13th Street , Philadelphia , Pennsylvania 19122 , United States
| | - Nguyen T Van
- Department of Chemistry , Temple University , 1901 North 13th Street , Philadelphia , Pennsylvania 19122 , United States
| | - Sarah E Wengryniuk
- Department of Chemistry , Temple University , 1901 North 13th Street , Philadelphia , Pennsylvania 19122 , United States
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5
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Teodoro BVM, Silva LF. Sequential Michael Addition/Electrophilic Alkynylation: Synthesis of α-Alkynyl-β-Substituted Ketones and Chromanones. J Org Chem 2018; 83:13604-13611. [PMID: 30284445 DOI: 10.1021/acs.joc.8b02251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the synthesis of α-alkynyl-β-substituted cyclic ketones and analogue chromanones via one-pot Michael addition/hypervalent iodine-based α-alkynylation. Cu(I)-catalyzed Michael addition using either alkyl-aluminum or Grignard reagents, followed by diastereoselective electrophilic alkynylation of the resulting enolate by 1-ethynyl-1λ3,2-benziodoxol-3(1H)-one (EBX) resulted in the α-alkynyl-β-substituted cyclic ketones or chromanones within 34-89% yield (16 examples). The reaction was successfully upscaled to the 5 mmol scale, and further functionalization of a model alkynylated ketone was demonstrated.
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Affiliation(s)
- Bruno V M Teodoro
- Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , São Paulo 05508-000 , Brazil
| | - Luiz F Silva
- Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , São Paulo 05508-000 , Brazil
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6
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Suárez-Rodríguez T, Suárez-Sobrino ÁL, Ballesteros A. Direct Synthesis of α-Iodoenones by IPy 2BF 4-Promoted Rearrangement of Propargylic Esters. J Org Chem 2018; 83:12575-12583. [PMID: 30247033 DOI: 10.1021/acs.joc.8b01746] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A direct access to α-iodoeones from iodonium ion and propargylic tosylates or acetates is described. Bis(pyridine) iodonium tetrafluoroborate (IPy2BF4, Barluenga's reagent) promotes the rearrangement of these propargylic alcohol derivatives in mild conditions. The transformation gives β-unsubstituted, β-monosubstituted, and β,β-disubstituted α-iodoenones in high yields. β-Substituted α-iodoenones are obtained with excellent ( Z)-selectivity.
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Affiliation(s)
- Tatiana Suárez-Rodríguez
- Instituto Universitario de Química Organometálica "Enrique Moles" and Departamento de Química Orgánica e Inorgánica , Universidad de Oviedo , c/Julián Clavería 8 , Oviedo 33006 , Spain
| | - Ángel L Suárez-Sobrino
- Instituto Universitario de Química Organometálica "Enrique Moles" and Departamento de Química Orgánica e Inorgánica , Universidad de Oviedo , c/Julián Clavería 8 , Oviedo 33006 , Spain
| | - Alfredo Ballesteros
- Instituto Universitario de Química Organometálica "Enrique Moles" and Departamento de Química Orgánica e Inorgánica , Universidad de Oviedo , c/Julián Clavería 8 , Oviedo 33006 , Spain
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7
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Qiu Y, Dlugosch M, Liu X, Khan F, Ward JS, Lan P, Banwell MG. Reductive Cyclization of o-Nitroarylated-α,β-unsaturated Aldehydes and Ketones with TiCl 3/HCl or Fe/HCl Leading to 1,2,3,9-Tetrahydro-4 H-carbazol-4-ones and Related Heterocycles. J Org Chem 2018; 83:12023-12033. [PMID: 30180589 DOI: 10.1021/acs.joc.8b01940] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Compounds such as 3, the product of a palladium[0]-catalyzed Ullmann cross-coupling of o-iodonitrobenzene and 2-iodocyclohex-2-en-1-one, undergo complementary modes of reductive cyclization depending upon the conditions employed. Thus, on treatment with hydrogen in the presence of palladium on carbon, the tetrahydrocarbazole 4 is formed, while reaction of the same substrate (3) with TiCl3 in acetone affords the 1,2,3,9-tetrahydro-4 H-carbazol-4-one 6.
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Affiliation(s)
- Yun Qiu
- Department of Food Science and Engineering , Jinan University , Guangzhou 510632 , China
| | - Michael Dlugosch
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Xin Liu
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Faiyaz Khan
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Jas S Ward
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Ping Lan
- Department of Food Science and Engineering , Jinan University , Guangzhou 510632 , China
| | - Martin G Banwell
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
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8
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Khan F, Dlugosch M, Liu X, Banwell MG. The Palladium-Catalyzed Ullmann Cross-Coupling Reaction: A Modern Variant on a Time-Honored Process. Acc Chem Res 2018; 51:1784-1795. [PMID: 30010313 DOI: 10.1021/acs.accounts.8b00169] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cross-coupling reactions, especially those that are catalyzed by palladium, have revolutionized the way in which carbon-carbon bonds can be formed. The most commonly deployed variants of such processes are the Suzuki-Miyaura, Mizoroki-Heck, Stille, and Negishi cross-coupling reactions, and these normally involve the linking of an organohalide or pseudohalide (such as a triflate or nonaflate) with an organo-metallic or -metalloid such as an organo-boron, -magnesium, -tin, or -zinc species. Since the latter type of coupling partner is often prepared from the corresponding halide, methods that allow for the direct cross-coupling of two distinct halogen-containing compounds would provide valuable and more atom-economical capacities for the formation of carbon-carbon bonds. While the venerable Ullmann reaction can in principle achieve this, it has a number of drawbacks, the most significant of which is that homocoupling of the reaction partners is a competitive, if not the dominant, process. Furthermore, such reactions normally occur only under forcing conditions (viz., often at temperatures in excess of 250 °C). As such, the Ullmann reaction has seen only limited application in this regard, especially as a mid- to late-stage feature of complex natural product synthesis. This Account details the development of the palladium-catalyzed Ullmann cross-coupling reaction as a useful method for the assembly of a range of heterocyclic systems relevant to medicinal and/or natural products chemistry. These couplings normally proceed under relatively mild conditions (<100 °C) over short periods of time and, usually, to the exclusion of (unwanted) homocoupling events. The keys to success are the appropriate choice of coupling partners, the form of the copper metal employed, and the choice of reaction solvent. At the present time, the cross-coupling partners capable of engaging in the title reaction are confined to halogenated and otherwise electron-deficient arenes and, as complementary reactants, α- or β-halogenated, α,β-unsaturated aldehydes, ketones, esters, lactones, lactams, and cycloimides. Nitro-substituted (and halogenated) arenes, in particular, serve as effective participants in these reactions, and the products of their coupling with the above-mentioned carbonyl-containing systems can be manipulated in a number of different ways. Depending on the positional relationship between the nitro and carbonyl groups in the cross-coupling product, the reduction of the former group, which can be achieved under a range of different conditions, provides, through intramolecular nucleophilic addition reactions, including Schiff base condensations, access to a diverse range of heterocyclic systems. These include indoles, quinolines, quinolones, isoquinolines, carbazoles, and carbolines. Tandem variants of such cyclization processes, in which Raney cobalt is used as a catalyst for the chemoselective reduction (by dihydrogen) of nitro and nitrile groups (but not olefins), allow for the assembly of a range of structurally challenging natural products, including marinoquinoline A, (±)-1-acetylaspidoalbidine, and (±)-gilbertine.
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Affiliation(s)
- Faiyaz Khan
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Michael Dlugosch
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Xin Liu
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Martin G. Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
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9
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Narayana C, Kumari P, Sagar R. Regioselective Synthesis of Chirally Enriched Tetrahydrocarbazolones and Tetrahydrocarbazoles. Org Lett 2018; 20:4240-4244. [DOI: 10.1021/acs.orglett.8b01656] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chintam Narayana
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University (SNU), NH91, Tehsil-Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Priti Kumari
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University (SNU), NH91, Tehsil-Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
| | - Ram Sagar
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University (SNU), NH91, Tehsil-Dadri, Gautam Buddha Nagar, Uttar Pradesh 201314, India
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
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10
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Tiwari V, Singh A. Expeditious Conversion of Iodoallenes to Iodoenals Mediated by Sodium Azide and Iodine. ChemistrySelect 2018. [DOI: 10.1002/slct.201801121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vibha Tiwari
- Department of ChemistryIndian Institute of Technology Kanpur Kanpur-208016, Uttar Pradesh India
| | - Anand Singh
- Department of ChemistryIndian Institute of Technology Kanpur Kanpur-208016, Uttar Pradesh India
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11
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Khan F, Dlugosch M, Liu X, Khan M, Banwell MG, Ward JS, Carr PD. Palladium-Catalyzed Ullmann Cross-Coupling of β-Iodoenones and β-Iodoacrylates with o-Halonitroarenes or o-Iodobenzonitriles and Reductive Cyclization of the Resulting Products To Give Diverse Heterocyclic Systems. Org Lett 2018; 20:2770-2773. [PMID: 29676922 DOI: 10.1021/acs.orglett.8b01015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The palladium-catalyzed Ullmann cross-coupling of β-iodoenones and β-iodoacrylates such as 5 (X = I) with o-halonitroarenes and o-iodobenzonitriles including 2 affords products such as compound 7. These can be engaged in a range of reductive cyclization reactions leading to heterocyclic frameworks such as 3,4-benzomorphan derivative 43.
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Affiliation(s)
- Faiyaz Khan
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Michael Dlugosch
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Xin Liu
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Marium Khan
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Jas S Ward
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Paul D Carr
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
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12
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Yan Q, Gin E, Wasinska-Kalwa M, Banwell MG, Carr PD. A Palladium-Catalyzed Ullmann Cross-Coupling/Reductive Cyclization Route to the Carbazole Natural Products 3-Methyl-9H-carbazole, Glycoborine, Glycozoline, Clauszoline K, Mukonine, and Karapinchamine A. J Org Chem 2017; 82:4148-4159. [DOI: 10.1021/acs.joc.7b00044] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Qiao Yan
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Emma Gin
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Malgorzata Wasinska-Kalwa
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Martin G. Banwell
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Paul D. Carr
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
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13
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Tharra P, Baire B. Unconventional Reactivity of (Z
)-Enoate Propargylic Alcohols in the Presence of Acids. Chemistry 2017; 23:2014-2017. [DOI: 10.1002/chem.201605654] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Prabhakararao Tharra
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu 600036 India
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu 600036 India
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14
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Stempel E, Gaich T. Cyclohepta[b]indoles: A Privileged Structure Motif in Natural Products and Drug Design. Acc Chem Res 2016; 49:2390-2402. [PMID: 27709885 DOI: 10.1021/acs.accounts.6b00265] [Citation(s) in RCA: 222] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Seven-membered rings fused with an indole are termed cyclohepta[b]indoles. Compounds exhibiting this structure motif display a broad spectrum of biological activities, ranging from inhibition of adipocyte fatty-acid-binding protein (A-FABP), deacetylation of histones, inhibition of leukotriene production p53, antituberculosis activities, and anti-HIV activities. These biological profiles are found in natural products containing the cyclohepta[b]indole motif, as well as in pharmaceuticals that contain this structure motif. Therefore, the biology of molecules derived from the skeleton of cyclohepta[b]indoles, as well as cyclopenta- and cyclohexa[b]indoles, has attracted considerable interest from the pharmaceutical industry as potential therapeutics in recent years. This is reflected by more than two dozen patents that have been issued in the past decade, solely based on the cyclohepta[b]indole structure motif. The efficient preparation of highly functionalized and unsymmetrically substituted cyclohepta[b]indoles has therefore become of central interest for synthetic organic chemists. Historically, this structure motif most often has been prepared by means of a Fischer indole synthesis. Although very robust and useful, this reaction poses certain limitations. Especially unsymmetrically functionalized cyclohepta[b]indoles are not suitable for a Fischer indole type synthesis, since product mixtures are inevitable. Therefore, novel methodologies to overcome these synthetic obstacles have been developed in recent years. This Account introduces all natural products and pharmaceutical compounds exhibiting the cyclohepta[b]indole motif. The structural variability within cyclohepta[b]indole alkaloids in combination with the broad range of organisms where these alkaloids have been isolated from, strongly suggests that the cyclohepta[b]indole is somehow a "privileged" structure motif. The organisms producing these compounds range from evergreen trees (actinophyllic acid) to cyanobacteria (ambiguinines). The synthetic methodologies to construct these molecular scaffolds (natural and unnatural in origin) are in turn highlighted and discussed with regard to their potential to access highly functionalized and unsymmetrical cyclohepta[b]indoles, for which they specifically have been designed. The methods are classified with respect to reaction type and whether or not they are enantioselective. Finally, the syntheses of cyclohepta[b]indole natural products are presented, thereby in each case, focusing on the construction of this structure motif in the course of the respective total synthesis. As a conclusion, we end by contrasting the methodological progress in the field with the actual successful application of the newly developed methods to the synthesis of complex structures to pinpoint the urgent requirement for further synthetic development for efficient synthetic design of this "privileged" structure motif.
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Affiliation(s)
- Erik Stempel
- Institut
für Organische Chemie, Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Tanja Gaich
- Lehrstuhl
für Organische Chemie, Universität Konstanz, 78457 Konstanz, Germany
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15
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16
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Yang K, Zhou F, Kuang Z, Gao G, Driver TG, Song Q. Diborane-Mediated Deoxygenation of o-Nitrostyrenes To Form Indoles. Org Lett 2016; 18:4088-91. [PMID: 27499149 DOI: 10.1021/acs.orglett.6b01934] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A mild, transition metal-free, diborane-mediated deoxygenation of nitro groups was discovered that in situ generates nitrosoarene reactive intermediates. This new reactivity mode of B2pin2 was leveraged to construct indoles from o-nitrostyrenes through a reductive-cyclization reaction that exhibits a Hammett ρ-value of +0.97 relative to σpara values. Our new deoxygenation reaction is efficient, practical, and scaleable, enabling access to a broad range of indoles.
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Affiliation(s)
- Kai Yang
- Institute of Next Generation Matter Transformation, College of Chemical Engineering, College of Material Sciences Engineering at Huaqiao University , 668 Jimei Boulevard, Xiamen, Fujian 361021, P. R. China
| | - Fei Zhou
- Department of Chemistry, University of Illinois at Chicago , 845 West Taylor Street, Chicago, Illinois 60607-7061, United States
| | - Zhijie Kuang
- Institute of Next Generation Matter Transformation, College of Chemical Engineering, College of Material Sciences Engineering at Huaqiao University , 668 Jimei Boulevard, Xiamen, Fujian 361021, P. R. China
| | - Guoliang Gao
- Institute of Next Generation Matter Transformation, College of Chemical Engineering, College of Material Sciences Engineering at Huaqiao University , 668 Jimei Boulevard, Xiamen, Fujian 361021, P. R. China
| | - Tom G Driver
- Institute of Next Generation Matter Transformation, College of Chemical Engineering, College of Material Sciences Engineering at Huaqiao University , 668 Jimei Boulevard, Xiamen, Fujian 361021, P. R. China.,Department of Chemistry, University of Illinois at Chicago , 845 West Taylor Street, Chicago, Illinois 60607-7061, United States
| | - Qiuling Song
- Institute of Next Generation Matter Transformation, College of Chemical Engineering, College of Material Sciences Engineering at Huaqiao University , 668 Jimei Boulevard, Xiamen, Fujian 361021, P. R. China
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18
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Kitamura M, Fukuma H, Kobayashi M, Okayama S, Okauchi T. Axially Chiral Bifunctional 8,8'-Biquinolyl: Synthesis of 7,7'-Dihydroxymethyl-8,8'-biquinolyl via Pd-Catalyzed Double C-H Oxidation of 7,7'-Dimethyl-8,8'-biquinolyl. J Org Chem 2016; 81:3956-60. [PMID: 27042866 DOI: 10.1021/acs.joc.6b00534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bifunctional C2-symmetric 7,7'-dihydroxymethyl-8,8'-biquinolyl (2) was synthesized in short steps via (i) Cu/Pd-catalyzed homo coupling of 7-methyl-8-bromoquinoline and (ii) Pd(II)-catalyzed double C-H oxidation. Axial chirality of 2 and its synthetic precursor 7,7'-dimethyl-8,8'-biquinolyl (3) is stable. Optically active 2 was obtained through separation of racemic 2 by chiral column HPLC or Pd(II)-catalyzed double C-H oxidation of optically active 3. The absolute stereochemistry of enantiomers of 2 and 3 was determined using the exciton chirality method.
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Affiliation(s)
- Mitsuru Kitamura
- Department of Applied Chemistry, Kyushu Institute of Technology , 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550 Japan
| | - Hiroaki Fukuma
- Department of Applied Chemistry, Kyushu Institute of Technology , 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550 Japan
| | - Mitsuaki Kobayashi
- Department of Applied Chemistry, Kyushu Institute of Technology , 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550 Japan
| | - Shinya Okayama
- Department of Applied Chemistry, Kyushu Institute of Technology , 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550 Japan
| | - Tatsuo Okauchi
- Department of Applied Chemistry, Kyushu Institute of Technology , 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550 Japan
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19
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Paju A, Kostomarova D, Matkevitš K, Laos M, Pehk T, Kanger T, Lopp M. 3-Alkyl-1,2-cyclopentanediones by Negishi cross-coupling of a 3-bromo-1,2-cyclopentanedione silyl enol ether with alkylzinc reagents: an approach to 2-substituted carboxylic acid γ-lactones, homocitric and lycoperdic acids. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Kremlev MM, Mushta AI, Tyrra W, Yagupolskii YL, Naumann D, Schäfer M. Approaches to prepare perfluoroalkyl and pentafluorophenyl copper couples for cross-coupling reactions with organohalogen compounds. Dalton Trans 2015; 44:19693-9. [PMID: 26488228 DOI: 10.1039/c5dt02925b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of iodoperfluoroalkanes CnF2n+1I (n = 2, 3, 4) and n-BuLi at low temperatures give NMR spectroscopic evidence for LiCnF2n+1 which were converted into LiCu(CnF2n+1)2 derivatives upon treatment with 0.5 mol copper(i) bromide, CuBr. An alternative route to obtain perfluoroorgano copper couples, Cu(Rf)2Ag (Rf = n-C3F7, n-C4F9, C6F5) was achieved from the reactions of the corresponding perfluoroorgano silver(i) reagents, AgRf, and elemental copper through redox transmetallations. The composition of the resulting reactive intermediates was investigated by means of (19)F NMR spectroscopy and ESI mass spectrometry. Perfluoro-n-propyl and perfluoro-n-butyl copper-silver reagents prepared by the oxidative transmetallation route exhibited good properties in C-C bond formation reactions with acid chlorides even under moderate conditions. Substitution of bromine directly bound to aromatics for perfluoroalkyl groups was achieved at elevated temperatures, while success in halide substitution reactions using lithium copper couples remained poor.
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Affiliation(s)
- Mikhail M Kremlev
- Institute of Organic Chemistry, National Academy of Sciences of the Ukraine, Murmanskaya St. 5, UA-02094 Kyiv, Ukraine.
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21
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Hu Y, Ma Y, Sun R, Yu X, Xie H, Wang W. Amine-Catalyzed Highly Regioselective and Stereoselective C(sp(2) )-C(sp(2) ) Cross-Coupling of Naphthols with trans-α,β-Unsaturated Aldehydes. Chem Asian J 2015; 10:1859-63. [PMID: 26096893 DOI: 10.1002/asia.201500460] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Indexed: 11/06/2022]
Abstract
A metal-free C(sp(2) )-C(sp(2) ) cross-coupling approach to highly congested (E)-α-naphtholylenals from simple naphthols and enals is described. The mild reaction conditions with pyridine hydrobromideperbromide (PHBP) as the bromination reagent in the presence of piperidine or diphenylprolinol trimethylsilyl (TMS) ether as promoters enable the process in good yields and with high chemoselectivity, regioselectivity, and stereoselectivity. The process involves an unprecedented pathway of in situ regioselective 4-bromination of 1-naphthols and the subsequent unusual aromatic nucleophilic substitution of the resulting 4-bromo-1-naphthols with the α-C(sp(2) ) of enals through a Michael-type Friedel-Crafts alkylation-dearomatization followed by a cyclopropanation ring-opening cascade process. The noteworthy features of this strategy are highlighted by the highly efficient creation of a C(sp(2) )-C(sp(2) ) bond from readily available unfunctionalized naphthols and enals catalyzed by non-metal, readily available cyclic secondary amines under mild reaction conditions.
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Affiliation(s)
- Yang Hu
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, State Key Laboratory of Bioengineering Reactors, East China University of Science&Technology, 200237, Shanghai, China
| | - Yueyue Ma
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, State Key Laboratory of Bioengineering Reactors, East China University of Science&Technology, 200237, Shanghai, China
| | - Rengwei Sun
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, State Key Laboratory of Bioengineering Reactors, East China University of Science&Technology, 200237, Shanghai, China
| | - Xinhong Yu
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, State Key Laboratory of Bioengineering Reactors, East China University of Science&Technology, 200237, Shanghai, China.
| | - Hexin Xie
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, State Key Laboratory of Bioengineering Reactors, East China University of Science&Technology, 200237, Shanghai, China.
| | - Wei Wang
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, State Key Laboratory of Bioengineering Reactors, East China University of Science&Technology, 200237, Shanghai, China. .,Department of Chemistry & Chemical Biology, University of New Mexico, Albuquerque, NM 87131-0001, USA.
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22
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Jana N, Zhou F, Driver TG. Promoting Reductive Tandem Reactions of Nitrostyrenes with Mo(CO)6 and a Palladium Catalyst To Produce 3H-Indoles. J Am Chem Soc 2015; 137:6738-41. [PMID: 25970322 DOI: 10.1021/jacs.5b02946] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Navendu Jana
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, United States
| | - Fei Zhou
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, United States
| | - Tom G. Driver
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, United States
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23
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Oukoloff K, Buron F, Routier S, Jean L, Renard PY. Synthetic Route to Rare Isoindolones Derivatives. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403649] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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Zhu HT, Fan MJ, Yang DS, Wang XL, Ke S, Zhang CY, Guan ZH. An iodine-promoted Meyer–Schuster rearrangement for the synthesis of α-iodo unsaturated ketones. Org Chem Front 2015. [DOI: 10.1039/c5qo00048c] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile and efficient iodine-promoted Meyer–Schuster rearrangement of propargyl alcohols for the synthesis of α-iodo-α,β-unsaturated ketones is presented.
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Affiliation(s)
- Hai-Tao Zhu
- Shannxi Key Laboratory of Phytochemistry
- Baoji University of Arts and Sciences
- Baoji 721013
- China
| | - Ming-Jin Fan
- Shannxi Key Laboratory of Phytochemistry
- Baoji University of Arts and Sciences
- Baoji 721013
- China
| | - De-Suo Yang
- Shannxi Key Laboratory of Phytochemistry
- Baoji University of Arts and Sciences
- Baoji 721013
- China
| | - Xiao-Ling Wang
- Shannxi Key Laboratory of Phytochemistry
- Baoji University of Arts and Sciences
- Baoji 721013
- China
| | - Sen Ke
- Shannxi Key Laboratory of Phytochemistry
- Baoji University of Arts and Sciences
- Baoji 721013
- China
| | - Chao-Yang Zhang
- Shannxi Key Laboratory of Phytochemistry
- Baoji University of Arts and Sciences
- Baoji 721013
- China
| | - Zheng-Hui Guan
- Key Laboratory of Synthesis and Natural Functional Molecule Chemistry of Ministry of Education
- Department of Chemistry & Materials Science
- Northwest University
- Xi'an 710069
- China
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25
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Goswami P, Borah AJ, Phukan P. Formation of Cyclohepta[b]indole Scaffolds via Heck Cyclization: A Strategy for Structural Analogues of Ervatamine Group of Indole Alkaloid. J Org Chem 2014; 80:438-46. [PMID: 25435251 DOI: 10.1021/jo502443a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Ervatamine, silicine, methuenine, etc., are naturally occurring alkaloids that exhibit antimicrobial, anticancer, and anti-HIV activities. Indole fused with a seven-membered carbocyclic ring is a commonly observed structural feature among this series of bioactive compounds. This work describes a strategic approach for the synthesis of cyclohepta[b]indole structural scaffolds. The synthetic strategy consists of a solvent-free Baylis-Hillman reaction of 2-bromobenzaldehydes, followed by iodine-catalyzed C-alkylation of indole with the Baylis-Hillman adducts. Finally, intramolecular Heck coupling reaction using Pd(OAc)2 as catalyst in the presence of benzyltrimethylammonium bromide under microwave condition produced the desired cyclohepta[b]indole derivatives.
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Affiliation(s)
| | - Arun Jyoti Borah
- Department of Chemistry, Gauhati University, Guwahati, 781014 Assam, India
| | - Prodeep Phukan
- Department of Chemistry, Gauhati University, Guwahati, 781014 Assam, India
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26
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27
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Guyon C, Baron M, Lemaire M, Popowycz F, Métay E. Commutative reduction of aromatic ketones to arylmethylenes/alcohols by hypophosphites catalyzed by Pd/C under biphasic conditions. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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28
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Taddei M, Mura MG, Rajamäki S, Luca LD, Porcheddu A. Palladium-Catalysed Dehydrogenative Generation of Imines from Amines. A Nature-Inspired Route to IndolesviaCross-Couplings of Amines with Arylhydrazines. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300559] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Bae YK, Cho CS, Yoon NS. Palladium-catalyzed Carbonylative Cyclization of 2-Bromocyclohex-1-enecarbaldehydes with Aliphatic Primary Amines Leading to 3-Aminohydroisoindol-1-ones. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.9.2803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Putra AE, Takigawa K, Tanaka H, Ito Y, Oe Y, Ohta T. Transition-Metal-Catalyzed Regioselective Alkylation of Indoles with Alcohols. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300744] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Ouzouni MD, Fokas D. Synthetic Studies of Kinamycin Antibiotics: Stereoselective Synthesis of the Highly Oxygenated D-Ring and Construction of the ABD-Ring System of Kinamycins. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300858] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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32
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Ho SL, Cho CS. Ligand-free CuI-catalyzed coupling and cyclization of β-bromo-α,β-unsaturated amides with formamide leading to pyrimidinones. Appl Organomet Chem 2013. [DOI: 10.1002/aoc.3016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Son Long Ho
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
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33
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Pd(II)-catalyzed aerobic oxidative intramolecular hydroamination and C–H functionalization of N-alkynyl anilines for the synthesis of indole derivatives. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.01.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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34
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Son JI, Cho CS, Choi HJ. CuI/amino acid-catalyzed coupling and cyclization of β-bromo-α,β-unsaturated amides with terminal alkynes leading to (3Z)-3-alkylidenepyrrol-1-ones. Appl Organomet Chem 2013. [DOI: 10.1002/aoc.2990] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jong Ik Son
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
| | - Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
| | - Heung-Jin Choi
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
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35
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Han X, Yue Z, Zhang X, He Q, Yang C. Copper-Mediated, Palladium-Catalyzed Cross-Coupling of 3-Iodochromones, Thiochromones, and Quinolones with Ethyl Bromodifluoroacetate. J Org Chem 2013; 78:4850-6. [DOI: 10.1021/jo400412k] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Xiaodong Han
- State Key Laboratory of Drug
Research, Shanghai Institute of Materia Medica, SIBS, Chinese Academy of Sciences, 555 Zu Chong Zhi Road,
Shanghai 201203, People’s Republic of China
- Department of Pharmaceutical
Engineering, School of Chemical Engineering, Wuhan University of Technology, 205 Luo Shi Road, Wuhan, Hubei 430070,
People’s Republic of China
| | - Zhizhou Yue
- Department of Pharmaceutical
Engineering, School of Chemical Engineering, Wuhan University of Technology, 205 Luo Shi Road, Wuhan, Hubei 430070,
People’s Republic of China
| | - Xiaofei Zhang
- State Key Laboratory of Drug
Research, Shanghai Institute of Materia Medica, SIBS, Chinese Academy of Sciences, 555 Zu Chong Zhi Road,
Shanghai 201203, People’s Republic of China
| | - Qian He
- State Key Laboratory of Drug
Research, Shanghai Institute of Materia Medica, SIBS, Chinese Academy of Sciences, 555 Zu Chong Zhi Road,
Shanghai 201203, People’s Republic of China
| | - Chunhao Yang
- State Key Laboratory of Drug
Research, Shanghai Institute of Materia Medica, SIBS, Chinese Academy of Sciences, 555 Zu Chong Zhi Road,
Shanghai 201203, People’s Republic of China
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36
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Ho SL, Cho CS, Choi HJ, Sohn HS. CuI/amino acid catalysis in coupling and cyclization of β-bromo-α,β-unsaturated carboxylic acids with terminal alkynes leading to alkylidenefuranones. Appl Organomet Chem 2013. [DOI: 10.1002/aoc.2963] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Son Long Ho
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Heung-Jin Choi
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Ho-Sang Sohn
- Department of Materials Science and Metallurgical Engineering; Kyungpook National University; Daegu 702-701 South Korea
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37
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Gartshore CJ, Lupton DW. Enantioselective Palladium-Catalyzed Decarboxylative Allylation of Carbazolones and Indolones: Formal Synthesis of (+)-Kopsihainanine A. Angew Chem Int Ed Engl 2013; 52:4113-6. [DOI: 10.1002/anie.201209069] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Indexed: 11/10/2022]
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38
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Gartshore CJ, Lupton DW. Enantioselective Palladium-Catalyzed Decarboxylative Allylation of Carbazolones and Indolones: Formal Synthesis of (+)-Kopsihainanine A. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209069] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Dejon L, Mohammed H, Du P, Jacob C, Speicher A. Synthesis of chromenoindole derivatives from Robinia pseudoacacia. MEDCHEMCOMM 2013. [DOI: 10.1039/c3md00213f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Lee HK, Cho CS. Palladium-catalyzed cyclization of β-bromo-α,β-unsaturated ketones with arylhydrazines leading to 3-substituted 1-aryl-1 H
-pyrazoles. Appl Organomet Chem 2012. [DOI: 10.1002/aoc.2900] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hye Kyung Lee
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
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41
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López-Iglesias M, Busto E, Gotor V, Gotor-Fernández V. Stereoselective Synthesis of 2,3-Disubstituted Indoline Diastereoisomers by Chemoenzymatic Processes. J Org Chem 2012; 77:8049-55. [DOI: 10.1021/jo301307q] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- María López-Iglesias
- Departamento
de Química Orgánica e Inorgánica,
Instituto Universitario de Biotecnología de Asturias, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Eduardo Busto
- Departamento
de Química Orgánica e Inorgánica,
Instituto Universitario de Biotecnología de Asturias, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Vicente Gotor
- Departamento
de Química Orgánica e Inorgánica,
Instituto Universitario de Biotecnología de Asturias, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Vicente Gotor-Fernández
- Departamento
de Química Orgánica e Inorgánica,
Instituto Universitario de Biotecnología de Asturias, Universidad de Oviedo, 33006 Oviedo, Spain
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42
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Ma X, Vo Y, Banwell MG, Willis AC. Total Synthesis of Marinoquinoline A Using a Palladium(0)-Catalyzed Ullmann Cross-Coupling Reaction. ASIAN J ORG CHEM 2012. [DOI: 10.1002/ajoc.201200037] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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43
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Cho CS, Son JI, Yoon NS. Palladium-catalyzed carbonylative cyclization of 1-bromoallyl bromides with anilines leading to 1-aryl-1H
-pyrrol-2(5H
)-ones. Appl Organomet Chem 2012. [DOI: 10.1002/aoc.2887] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Jong Ik Son
- Department of Applied Chemistry; Kyungpook National University; Daegu 702-701 South Korea
| | - Nam Sik Yoon
- Department of Textile System Engineering; Kyungpook National University; Daegu 702-701 South Korea
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44
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Lee HK, Cho CS. Palladium-catalyzed carbonylative cyclization of 3-bromoallyl alcohols leading to furan-2(5H)-ones. Appl Organomet Chem 2012. [DOI: 10.1002/aoc.2864] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hye Kyung Lee
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
| | - Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
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45
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Schmidt AW, Reddy KR, Knölker HJ. Occurrence, Biogenesis, and Synthesis of Biologically Active Carbazole Alkaloids. Chem Rev 2012; 112:3193-328. [PMID: 22480243 DOI: 10.1021/cr200447s] [Citation(s) in RCA: 899] [Impact Index Per Article: 74.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Arndt W. Schmidt
- Department Chemie, Technische Universität Dresden,
Bergstrasse 66, 01069 Dresden, Germany
| | - Kethiri R. Reddy
- Department Chemie, Technische Universität Dresden,
Bergstrasse 66, 01069 Dresden, Germany
| | - Hans-Joachim Knölker
- Department Chemie, Technische Universität Dresden,
Bergstrasse 66, 01069 Dresden, Germany
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46
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Lee HK, Cho CS. Palladium-catalyzed carbonylative cyclization of β-bromo-α,β-unsaturated carboxylic acids with primary amines leading to N-alkylmaleimides. Appl Organomet Chem 2012. [DOI: 10.1002/aoc.2836] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hye Kyung Lee
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
| | - Chan Sik Cho
- Department of Applied Chemistry; Kyungpook National University; Daegu; 702-701; South Korea
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47
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Herzon SB, Woo CM. The diazofluorene antitumor antibiotics: Structural elucidation, biosynthetic, synthetic, and chemical biological studies. Nat Prod Rep 2012; 29:87-118. [DOI: 10.1039/c1np00052g] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Unexpected formation of fluorine-containing tetrahydrocarbazole during the reaction of indole, paraformaldehyde, and fluorine-containing β-ketoesters. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.06.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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49
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50
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Synthetic Studies on Amaryllidaceae and Other Terrestrially Derived Alkaloids. Top Curr Chem (Cham) 2011; 309:163-202. [DOI: 10.1007/128_2011_217] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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