1
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Xiao F, Yuan S, Huang H, Zhang F, Deng GJ. Copper-Catalyzed Three-Component Domino Cyclization for the Synthesis of 4-Aryl-5-(arythio)-2-(trifluoromethyl)oxazoles. Org Lett 2019; 21:8533-8536. [PMID: 31603338 DOI: 10.1021/acs.orglett.9b02934] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A copper-catalyzed oxidative cyclization of oxime, arylthiol, and trifluoroacetic anhydride for the construction of trisubstituted oxazoles has been developed. This transformation combines N-O bond cleavage, C-H functionalization, and intramolecular annulation, providing a practical protocol for the introduction of a trifluoromethyl (-CF3) group at oxazole rings.
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Affiliation(s)
- Fuhong Xiao
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
| | - Shanshan Yuan
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
| | - Huawen Huang
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
| | - Feng Zhang
- College of Science , Hunan Agricultural University , Changsha 410128 , China
| | - Guo-Jun Deng
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
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2
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Da Ho L, Otog N, Fujisawa I, Iwasa S. Catalytic Asymmetric Carbene Transfer Reactions of Diazo Oxime Ethers with Olefins and Their Synthetic Applications. Org Lett 2019; 21:7470-7474. [PMID: 31482700 DOI: 10.1021/acs.orglett.9b02771] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first catalytic asymmetric cyclopropanation of diazo oxime ethers with olefins was developed. In the presence of a Ru(II)-Pheox catalyst, various optically active cyclopropyl oxime derivatives were obtained in high yields (up to 99%) with high enantioselectivities (up to 98% ee). Furthermore, optically active cyclopropyl oxime ethers could be successfully converted into the corresponding cyclopropyl methylamine derivatives via metal hydride and Grignard reagent mediated Beckmann rearrangement, which are potential candidates for the assessment of biological and pharmaceutical activities.
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Affiliation(s)
- Linh Da Ho
- Department of Applied Chemistry and Life Science , Toyohashi University of Technology , 1-1 Hibarigaoka , Tempaku-cho , Toyohashi 441-8580 , Japan
| | - Nansalmaa Otog
- Department of Applied Chemistry and Life Science , Toyohashi University of Technology , 1-1 Hibarigaoka , Tempaku-cho , Toyohashi 441-8580 , Japan
| | - Ikuhide Fujisawa
- Department of Applied Chemistry and Life Science , Toyohashi University of Technology , 1-1 Hibarigaoka , Tempaku-cho , Toyohashi 441-8580 , Japan
| | - Seiji Iwasa
- Department of Applied Chemistry and Life Science , Toyohashi University of Technology , 1-1 Hibarigaoka , Tempaku-cho , Toyohashi 441-8580 , Japan
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3
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Fe3O4 MNPs as a green catalyst for syntheses of functionalized [1,3]-oxazole and 1H-pyrrolo-[1,3]-oxazole derivatives and evaluation of their antioxidant activity. Mol Divers 2019; 23:885-896. [DOI: 10.1007/s11030-019-09916-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 01/06/2019] [Indexed: 12/21/2022]
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4
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Choi S, Ha S, Park CM. α-Diazo oxime ethers for N-heterocycle synthesis. Chem Commun (Camb) 2018; 53:6054-6064. [PMID: 28516179 DOI: 10.1039/c7cc02650a] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Feature Article introduces the preparation and synthetic utility of α-diazo oxime ethers. α-Oximino carbenes are useful synthons for N-heterocycles, and can be easily prepared from α-diazo oxime ethers as precursors. We begin with the preparation of α-diazo oxime ethers and their application in [3+2] cycloaddition. It turns out that the nature of metals bound to carbenes plays a crucial role in modulating the reactivity of α-oximino carbenes, in which copper carbenes smoothly react with enamines, whereas the less reactive enol ethers and nitriles require gold carbenes. In Section 3.2, a discussion on N-O and C-H bond activation is presented. Carbenes derived from diazo oxime ethers show unique reactivity towards N-O and C-H bond activation, in which the proximity of the two functionalities, carbene and oxime ether, dictates the preferred reaction pathways toward pyridines, pyrroles, and 2H-azirines. In Section 3.3, the development of tandem reactions based on α-diazo oxime ethers is discussed. The nature of carbenes in which whether free carbenes or metal complexes are involved dissects the pathway and forms different types of 2H-azirines. The 2H-azirine formation turned out to be an excellent platform for the tandem synthesis of N-heterocycles including pyrroles and pyridines. In the last section, we describe the electrophilic activation of 2H-azirines with vinyl carbenes and oximino carbenes. The resulting azirinium species undergo rapid ring expansion rearrangements to form pyridines and pyrazines.
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Affiliation(s)
- Subin Choi
- Department of Chemistry, UNIST (Ulsan National Institute of Science & Technology), Ulsan 44919, Korea.
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5
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Loy NSY, Choi S, Kim S, Park CM. The synthesis of pyrroles and oxazoles based on gold α-imino carbene complexes. Chem Commun (Camb) 2018; 52:7336-9. [PMID: 27152984 DOI: 10.1039/c6cc01742h] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cationic gold complexes of α-oximimino carbenes have been identified to react with weak nucleophiles including enol ethers and nitriles. These findings allowed us to develop the highly efficient synthesis of pyrroles and oxazoles.
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Affiliation(s)
- Nicole S Y Loy
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Subin Choi
- Department of Chemistry, UNIST (Ulsan National Institute of Science & Technology), Ulsan 44919, Korea.
| | - Sunggak Kim
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Cheol-Min Park
- Department of Chemistry, UNIST (Ulsan National Institute of Science & Technology), Ulsan 44919, Korea.
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6
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Jouanno LA, Renault K, Sabot C, Renard PY. 5-Alkoxyoxazole - A Versatile Building Block in (Bio)organic Synthesis. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Laurie-Anne Jouanno
- Centre for Catalysis; Research and Innovation; Department of Chemistry; University of Ottawa; K1N 6N5 Ottawa Ontario Canada
| | - Kévin Renault
- Normandie Univ; COBRA; UMR 6014 & FR 3038; CNRS; Université de Rouen; 1 rue Tesnière 76821 Mont-Saint-Aignan, Cedex France
| | - Cyrille Sabot
- Normandie Univ; COBRA; UMR 6014 & FR 3038; CNRS; Université de Rouen; 1 rue Tesnière 76821 Mont-Saint-Aignan, Cedex France
| | - Pierre-Yves Renard
- Normandie Univ; COBRA; UMR 6014 & FR 3038; CNRS; Université de Rouen; 1 rue Tesnière 76821 Mont-Saint-Aignan, Cedex France
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7
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Gillie AD, Jannapu Reddy R, Davies PW. Efficient and Flexible Synthesis of Highly Functionalised 4‐Aminooxazoles by a Gold‐Catalysed Intermolecular Formal [3+2] Dipolar Cycloaddition. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500905] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Andrew D. Gillie
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, U.K. Fax: (+44)‐(0)121‐414‐4403
| | - Raju Jannapu Reddy
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, U.K. Fax: (+44)‐(0)121‐414‐4403
| | - Paul W. Davies
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, U.K. Fax: (+44)‐(0)121‐414‐4403
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8
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Ibrar A, Khan I, Abbas N, Farooq U, Khan A. Transition-metal-free synthesis of oxazoles: valuable structural fragments in drug discovery. RSC Adv 2016. [DOI: 10.1039/c6ra19324b] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
This review article encapsulates the recent developments in the metal-free approaches used to construct oxazole moiety.
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Affiliation(s)
- Aliya Ibrar
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Imtiaz Khan
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Naeem Abbas
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Umar Farooq
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Ajmal Khan
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
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9
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Liu JJ, Wang Y, Lin MJ, Huang CC, Dai WX. Photogeneration of two reduction-active charge-separated states in a hybrid crystal of polyoxometalates and naphthalene diimides. Dalton Trans 2015; 44:484-7. [DOI: 10.1039/c4dt03029j] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Upon irradiation, two kinds of long-lived charge-separated states for the reduction reactions can be generated in a hybrid crystal composed of two-dimensional naphthalene diimide coordination networks and polyoxometalates.
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Affiliation(s)
- Jian-Jun Liu
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- China
| | - Yao Wang
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- China
| | - Mei-Jin Lin
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- China
- State Key Laboratory of Structural Chemistry
| | - Chang-Cang Huang
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- China
| | - Wen-Xin Dai
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- China
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10
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Pagar VV, Liu RS. Gold-catalyzed α-furanylations of quinoline N-oxides with alkenyldiazo carbonyl species. Org Biomol Chem 2015; 13:6166-9. [DOI: 10.1039/c5ob00696a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gold-catalyzed α-furanylations of 8-alkylquinoline N-oxides have been achieved using various alkenyldiazo carbonyl species as nucleophiles.
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Affiliation(s)
| | - Rai-Shung Liu
- Department of Chemistry
- National Tsing-Hua University
- Hsinchu
- Republic of China
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11
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Yuan C, Liu H, Gao Z, Zhou L, Feng Y, Xiao Y, Guo H. Cu(I)-Catalyzed Highly Enantioselective [3 + 3] Cycloaddition between Two Different 1,3-Dipoles, Phthalazinium Dicyanomethanides and Iminoester-Derived Azomethine Ylides. Org Lett 2014; 17:26-9. [DOI: 10.1021/ol503169d] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Chunhao Yuan
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Honglei Liu
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Zhenzhen Gao
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Leijie Zhou
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Yalin Feng
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Yumei Xiao
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Hongchao Guo
- Department
of Applied Chemistry, China Agricultural University, Beijing 100193, China
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12
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Romero-Estudillo I, Batchu VR, Boto A. One-Pot Conversion of Amino Acids into 2,5-Disubstituted Oxazoles: No Metals Needed. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400496] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Wang J, Luo S, Huang J, Mao T, Zhu Q. Palladium-catalyzed imidoylative cyclization of α-isocyanoacetamides: efficient access to C2-diversified oxazoles. Chemistry 2014; 20:11220-4. [PMID: 25099222 DOI: 10.1002/chem.201403033] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Indexed: 01/11/2023]
Abstract
A novel procedure for the synthesis of C2-diversified oxazoles, through palladium-catalyzed imidoylative cyclization of α-isocyanoacetamides with aryl, vinyl, alkynyl halides, or triflates, was developed. Migratory insertion of isocyanide into a Csp3-palladium(II) intermediate in a cascade process was also realized, generating alkyl-substituted oxazoles. Therefore, oxazoles functionalized at the C2 position with sp, sp(2), and sp(3) hybridized carbon atoms are accessible by applying this method.
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Affiliation(s)
- Jian Wang
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530 (P.R. China), Fax: (+86) 20-3201-5299
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14
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Xu X, Doyle MP. The [3 + 3]-cycloaddition alternative for heterocycle syntheses: catalytically generated metalloenolcarbenes as dipolar adducts. Acc Chem Res 2014; 47:1396-405. [PMID: 24650430 PMCID: PMC3993878 DOI: 10.1021/ar5000055] [Citation(s) in RCA: 274] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Indexed: 12/12/2022]
Abstract
The combination of two or more unsaturated structural units to form cyclic organic compounds is commonly referred to as cycloaddition, and the combination of two unsaturated structural units that forms a six-membered ring is formally either a [5 + 1]-, [4 + 2]-, [2 + 2 + 2]-, or [3 + 3]-cycloaddition. Occurring as concerted or stepwise processes, cycloaddition reactions are among the most useful synthetic constructions in organic chemistry. Of these transformations, the concerted [4 + 2]-cycloaddition, the Diels-Alder reaction, is by far the best known and most widely applied. However, although symmetry disallowed as a concerted process and lacking certifiable examples until recently, stepwise [3 + 3]-cycloadditions offer advantages for the synthesis of a substantial variety of heterocyclic compounds, and they are receiving considerable attention. In this Account, we present the development of stepwise [3 + 3]-cycloaddition reactions from virtual invisibility in the 1990s to a rapidly growing synthetic methodology today, involving organocatalysis or transition metal catalysis. With origins in organometallic or vinyliminium ion chemistry, this area has blossomed into a viable synthetic transformation for the construction of six-membered heterocyclic compounds containing one or more heteroatoms. The development of [3 + 3]-cycloaddition transformations has been achieved through identification of suitable and compatible reactive dipolar adducts and stable dipoles. The reactive dipolar species is an energetic dipolar intermediate that is optimally formed catalytically in the reaction. The stepwise process occurs with the reactive dipolar adduct reacting as an electrophile or as a nucleophile to form the first covalent bond, and this association provides entropic assistance for the construction of the second covalent bond and the overall formal [3 + 3]-cycloaddition. Organocatalysis is well developed for both inter- and intramolecular synthetic transformations, but the potential of transition metal catalysis for [3 + 3]-cycloaddition has only recently emerged. The key to the rapid development of the transition metal-based methodology has been recognition that certain catalytically generated vinylcarbenes are effective dipolar adducts for reactions with stable dipolar compounds, including aryl and vinyl ylides. In particular, metallo-enolcarbenes that are generated catalytically from conveniently prepared stable enoldiazoacetates or from donor-acceptor cyclopropenes are highly effective dipolar adducts for [3 + 3]-cycloaddition. The electron-donating oxygen of the silyl ether enhances electrophilic ring closure to the metal-bound carbon of the initial adduct from vinylogous addition, and this enhancement inhibits the alternative [3 + 2]-cycloaddition across the carbon-carbon double bond of the vinylcarbene. Catalytically generated metallo-enolcarbenes react under mild conditions with a broad spectrum of compatible stable dipoles, including nitrones, azomethine imines, ylides, and certain covalent precursors of stable dipoles, to form [3 + 3]-cycloaddition products having the β-ketoester functionality (in dihydrooxazines, tetrahydropyridazines, pyrazolidinone and pyraxole derivatives, dihydroquinolines, and quinolizidines, for example) in high yield. Two ways to access these metallo-enolcarbenes, either by dinitrogen extrusion from enoldiazoacetate esters or by rearrangement of donor-acceptor cyclopropenes, enhance the versatility of the process. The [3 + 3]-cycloaddition methodology is a complementary strategy to [4 + 2]-cycloaddition for the synthesis of heterocyclic compounds having six-membered rings. High levels of enantioselectivity are obtained with the use of chiral ligands on transition metal catalysts that include those on dirhodium(II) and silver(I).
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Affiliation(s)
- Xinfang Xu
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Michael P. Doyle
- Department of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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15
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Haldón E, Besora M, Cano I, Cambeiro XC, Pericàs MA, Maseras F, Nicasio MC, Pérez PJ. Reaction of Alkynes and Azides: Not Triazoles Through Copper-Acetylides but Oxazoles Through Copper-Nitrene Intermediates. Chemistry 2014; 20:3463-74. [DOI: 10.1002/chem.201303737] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Indexed: 12/20/2022]
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16
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Xu X, Leszczynski JS, Mason SM, Zavalij PY, Doyle MP. Expedient access to substituted 3-amino-2-cyclopentenones by dirhodium-catalyzed [3+2]-annulation of silylated ketene imines and enoldiazoacetates. Chem Commun (Camb) 2014; 50:2462-4. [PMID: 24452444 DOI: 10.1039/c3cc48993k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a reaction that proceeds under mild conditions with remarkable functional group tolerance, structurally diverse 3-amino-2-cyclopentenones bearing a quaternary carbon at the 4-position have been synthesized through a formal [3+2]-cycloaddition reaction of silylated ketene imines (SKIs) and enoldiazoaceates by dirhodium catalysis.
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Affiliation(s)
- Xichen Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20740, USA.
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17
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Liu G, Xu G, Li J, Ding D, Sun J. Copper-catalyzed annulation of α-substituted diazoacetates with 2-ethynylanilines: the direct synthesis of C2-functionalized indoles. Org Biomol Chem 2014; 12:1387-90. [DOI: 10.1039/c3ob42350f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Copper-catalyzed direct annulation of α-substituted diazoacetates with 2-ethynylanilines leading to C2-functionalized indoles was achieved under mild reaction conditions. The C2-(carboxylate methyl) substituted indoles were obtained in moderate to high yields.
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Affiliation(s)
- Gang Liu
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Guangyang Xu
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Jian Li
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Dong Ding
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Jiangtao Sun
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
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19
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Xu X, Zavalij PY, Doyle MP. Highly enantioselective dearomatizing formal [3+3] cycloaddition reactions of N-acyliminopyridinium ylides with electrophilic enol carbene intermediates. Angew Chem Int Ed Engl 2013; 52:12664-8. [PMID: 24123489 PMCID: PMC3858852 DOI: 10.1002/anie.201305539] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Indexed: 11/09/2022]
Abstract
A effective dearomatizing formal [3+3]-cycloaddition reaction triggered by Rh(II)-catalyzed dinitrogen extrusion of enoldiazoacetates followed by vinylogous addition of metal enolcarbenes to N -acyliminopyridinium ylides that produces highly substituted 1,2,3,6-tetrahydropyridazines in up to 98% ee and in high yield has been developed.
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Affiliation(s)
- Xinfang Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Peter Y. Zavalij
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Michael P. Doyle
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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20
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Xu X, Zavalij PY, Doyle MP. Highly Enantioselective Dearomatizing Formal [3+3] Cycloaddition Reactions ofN-Acyliminopyridinium Ylides with Electrophilic Enol Carbene Intermediates. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305539] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Odabachian Y, Tong S, Wang Q, Wang MX, Zhu J. Zinc Bromide Promoted Coupling of Isonitriles with Carboxylic Acids To Form 2,4,5-Trisubstituted Oxazoles. Angew Chem Int Ed Engl 2013; 52:10878-82. [DOI: 10.1002/anie.201305506] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Indexed: 12/19/2022]
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22
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Odabachian Y, Tong S, Wang Q, Wang MX, Zhu J. Zinc Bromide Promoted Coupling of Isonitriles with Carboxylic Acids To Form 2,4,5-Trisubstituted Oxazoles. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305506] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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23
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Odabachian Y, Wang Q, Zhu J. Tertiary Amines as Synthetic Equivalents of Vinyl Cations: Zinc Bromide Promoted Coupling of Propargylamines with α-Isocyanoacetamides To Give 2,4,5-Trisubstituted Oxazoles Initiated by an Internal Redox Process. Chemistry 2013; 19:12229-33. [DOI: 10.1002/chem.201302106] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Lonzi G, López LA. Regioselective Synthesis of Functionalized PyrrolesviaGold(I)-Catalyzed [3+2] Cycloaddition of Stabilized Vinyl Diazo Derivatives and Nitriles. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300346] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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25
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Xu X, Xu X, Zavalij PY, Doyle MP. Dirhodium(II)-catalyzed formal [3+2+1]-annulation of azomethine imines with two molecules of a diazo ketone. Chem Commun (Camb) 2013; 49:2762-4. [PMID: 23443271 PMCID: PMC3829720 DOI: 10.1039/c3cc41119b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A highly diastereoselective formal [3+2+1]-cycloaddition reaction that produces multi-functionalized bicyclic pyrazolidinone derivatives is achieved in moderate to high yield by Rh2(4S-MPPIM)4-catalyzed reaction of azomethine imines with two molecules of a diazo ketone.
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Affiliation(s)
- Xinfang Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, 20742, USA
| | - Xichen Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, 20742, USA
| | - Peter Y. Zavalij
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, 20742, USA
| | - Michael P. Doyle
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, 20742, USA
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Xu X, Zavalij PY, Hu W, Doyle MP. Vinylogous reactivity of enol diazoacetates with donor-acceptor substituted hydrazones. Synthesis of substituted pyrazole derivatives. J Org Chem 2013; 78:1583-8. [PMID: 23301562 DOI: 10.1021/jo302696y] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A regiospecific synthesis of multifunctional pyrazoleshas been developed from a cascade process triggered by Rh(II)-catalyzed dinitrogen extrusion from enol diazoacetates with vinylogous nucleophilic addition followed by Lewis acid catalyzed cyclization and aromatization.
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Affiliation(s)
- Xinfang Xu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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Xu X, Zavalij PJ, Doyle MP. A donor–acceptor cyclopropene as a dipole source for a silver(i) catalyzed asymmetric catalytic [3+3]-cycloaddition with nitrones. Chem Commun (Camb) 2013; 49:10287-9. [DOI: 10.1039/c3cc46415f] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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