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Xiang JC, Wang JW, Yuan P, Ma JT, Wu AX, Liao ZX. Switching Over of the Chemoselectivity: I 2-DMSO-Enabled α,α-Dichlorination of Functionalized Methyl Ketones. J Org Chem 2022; 87:15101-15113. [PMID: 36349364 DOI: 10.1021/acs.joc.2c01591] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Precise control of the chemoselectivity of the halogenation of a substrate equipped with multiple nucleophilic sites is highly demanding and challenging. Most reported chlorinations of methyl ketones show poor compatibility or even exclusive selectivity toward electron-rich arene, olefin, and alkyne residues. This is attributed to the direct or in situ employment of electrophilic Cl2/Cl+ species. Here, we reported that, even bearing those competitive residues, methyl ketones can still undergo dichlorination to afford α,α-dichloroketones in a chemo-specific manner. Enabled by the I2-dimethyl sulfoxide catalytic system, in which hydrochloric acid only acts as a nucleophilic Cl- donor, this straightforward dichlorination reaction is safe and operator-friendly and has high atomic economy, giving access to structurally diverse α,α-dichloroketones in good yields and with good functional-group tolerance.
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Affiliation(s)
- Jia-Chen Xiang
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing 211189, China
| | - Jia-Wei Wang
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing 211189, China
| | - Peng Yuan
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing 211189, China
| | - Jin-Tian Ma
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | - An-Xin Wu
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | - Zhi-Xin Liao
- Department of Pharmaceutical Engineering, School of Chemistry and Chemical Engineering and Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing 211189, China
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2
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4-(Trifluoromethyl) coumarin-fused pyridines: Regioselective synthesis and photophysics, electrochemical, and antioxidative activity. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109822] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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3
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Synthesis and photophysical properties of trichloro(fluoro)-Substituted 6-(3-oxo-1-(alk-1-en-1-yl)amino)coumarins and their 2,2-Difluoro-2H-1,3,2-oxazaborinin-3-ium-2-uide heterocycles. J Fluor Chem 2020. [DOI: 10.1016/j.jfluchem.2020.109614] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Rosa WC, Rocha IO, Rodrigues MB, Coelho HS, Denardi LB, Ledur PC, Zanatta N, Acunha TV, Iglesias BA, Bonacorso HG. Novel Alkyl(aryl)-Substituted 2,2-Difluoro-6-(trichloromethyl)-2 H-1,3,2-oxazaborinin-3-ium-2-uides: Synthesis, Antimicrobial Activity, and CT-DNA Binding Evaluations. Front Pharmacol 2020; 11:1328. [PMID: 33013370 PMCID: PMC7493717 DOI: 10.3389/fphar.2020.01328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 08/10/2020] [Indexed: 01/22/2023] Open
Abstract
The synthesis, antimicrobial activity evaluations, biomolecule-binding properties (DNA), and absorption and emission properties of a new series of (Z)-1,1,1-trichloro-4-alkyl(aryl)amino-4-arylbut-3-en-2-ones (4, 5) and 2,2-difluoro-3-alkyl(aryl)amino-4-aryl-6-(trichloromethyl)-2H-1,3,2-oxazaborinin-3-ium-2-uides (6, 7) in which 3(4)-alkyl(aryl) = H, Me, iso-propyl, n-butyl, C6H5, 4-CH3C6H4, 4-CH3OC6H4, 4-NO2C6H4, 4-FC6H4, 4-BrC6H4, 2-naphthyl, is reported. A series of β-enaminoketones (4, 5) is synthesized from the O,N-exchange reaction of some amines (3) with (Z)-1,1,1-trichloro-4-methoxy-4-aryl-but-3-en-2-ones (1, 2) at 61-90% yields. Subsequently, reactions of the resulting β-enaminoketones with an appropriate source of boron (BF3.OEt2) gave the corresponding oxazaborinine derivatives (6, 7) at 50-91% yields. UV-Vis and emission properties of biomolecule-binding properties for the DNA of these new BF2-β-enamino containing CCl3 units were also evaluated. Some compounds from the present series also exhibited potent antimicrobial effects on various pathogenic microorganisms at concentrations below those that showed cytotoxic effects. Compounds 4d, 4e, 6e, and 6f showed the best results and are very significant against P. zopfii, which causes diseases in humans and animals.
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Affiliation(s)
- Wilian C Rosa
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Inaiá O Rocha
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Melissa B Rodrigues
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Helena S Coelho
- Laboratório de Pesquisas Micológicas (LAPEMI), Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, Santa Maria, Brazil
- Instituto Federal de Educação, Ciência e Tecnologia Farroupilha, Santa Maria, Brazil
| | - Laura B Denardi
- Laboratório de Pesquisas Micológicas (LAPEMI), Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Pauline C Ledur
- Laboratório de Pesquisas Micológicas (LAPEMI), Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Thiago V Acunha
- Laboratório de Bioinorgânica e Materiais Porfirínicos, Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Bernardo A Iglesias
- Laboratório de Bioinorgânica e Materiais Porfirínicos, Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | - Helio G Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, Brazil
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5
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Chalyk BA, Khutorianskyi A, Lysenko A, Fil Y, Kuchkovska YO, Gavrilenko KS, Bakanovych I, Moroz YS, Gorlova AO, Grygorenko OO. Regioselective Synthesis of Functionalized 3- or 5-Fluoroalkyl Isoxazoles and Pyrazoles from Fluoroalkyl Ynones and Binucleophiles. J Org Chem 2019; 84:15212-15225. [PMID: 31661620 DOI: 10.1021/acs.joc.9b02258] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A facile synthetic route toward either 3- or 5-fluoroalkyl-substituted isoxazoles or pyrazoles containing an additional functionalization site was developed and applied on a multigram scale. The elaborated approach extends the scope of fluoroalkyl substituents for introduction into the heterocyclic moiety, and uses convenient transformations of the side chain for incorporation of fluoroalkyl-substituted azoles into the structures of biologically active molecules. The utility of the obtained building blocks for isosteric replacement of alkyl-substituted isoxazole and pyrazole was shown by the synthesis of fluorinated Isocarboxazid and Mepiprazole analogues.
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Affiliation(s)
- Bohdan A Chalyk
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Institute of Organic Chemistry , National Academy of Sciences of Ukraine , Murmanska Street 5 , Kyiv 02660 , Ukraine
| | - Andrii Khutorianskyi
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
| | - Andrii Lysenko
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
| | - Yulia Fil
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
| | - Yuliya O Kuchkovska
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
| | - Konstantin S Gavrilenko
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
| | - Iulia Bakanovych
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
| | - Yurii S Moroz
- Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine.,Chemspace , Ilukstes iela 38-5 , Riga , LV - 1082 , Latvia
| | - Alina O Gorlova
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Institute of Organic Chemistry , National Academy of Sciences of Ukraine , Murmanska Street 5 , Kyiv 02660 , Ukraine
| | - Oleksandr O Grygorenko
- Enamine Ltd. , Chervonotkatska Street 78 , Kyiv 02094 , Ukraine.,Taras Shevchenko National University of Kyiv , Volodymyrska Street 60 , Kyiv 01601 , Ukraine
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6
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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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7
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Golovanov AA, Odin IS, Zlotskii SS. Conjugated enynones: preparation, properties and applications in organic synthesis. RUSSIAN CHEMICAL REVIEWS 2019. [DOI: 10.1070/rcr4808] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Xu C, Zhu Z, Wang Y, Jing Z, Gao B, Zhao L, Dong WK. Oxidative α-Trichloromethylation of Tertiary Amines: An Entry to α-Amino Acid Esters. J Org Chem 2019; 84:2234-2242. [PMID: 30669841 DOI: 10.1021/acs.joc.8b03238] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Changming Xu
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhaobin Zhu
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
| | - Yongchang Wang
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
| | - Zhiguo Jing
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
| | - Bin Gao
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
| | - Li Zhao
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
| | - Wen-Kui Dong
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou 730070, China
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9
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Liu X, Hong D, She Z, Hersh WH, Yoo B, Chen Y. Complementary regioselective synthesis of 3,5-disubstituted isoxazoles from ynones. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.043] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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11
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Nakada M, Kuwabara T, Furukawa S, Hada M, Minoura M, Saito M. Synthesis and reactivity of a ruthenocene-type complex bearing an aromatic π-ligand with the heaviest group 14 element. Chem Sci 2017; 8:3092-3097. [PMID: 28507684 PMCID: PMC5412479 DOI: 10.1039/c6sc04843a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 02/11/2017] [Indexed: 11/21/2022] Open
Abstract
An anionic ruthenocene with an η5-coordinating plumbole ligand was prepared and reacted with electrophiles to afford plumbole complexes.
An anionic ruthenocene derived from a dilithioplumbole complex was prepared. In the complex, the plumbole ligand coordinates a ruthenium atom in an η5-fashion, similar to the cyclopentadienyl ligand in ferrocene. The ruthenocene that has the aromatic π-ligand with the heaviest group 14 element reacted with electrophiles to afford the plumbole complexes wherein the plumbole ligands show deviation from planarity, in contrast to the planar plumbole ring in the anionic ruthenocene. The bent angles of the plumbole ligands are dependent on the substituents on the lead atoms. Cyclic voltammetry measurements revealed that the plumbole complexes are oxidized more easily than the corresponding stannole complexes.
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Affiliation(s)
- Marisa Nakada
- Department of Chemistry , Graduate School of Science and Engineering , Saitama University , Shimo-okubo, Sakura-ku , Saitama-city , Saitama 338-8570 , Japan .
| | - Takuya Kuwabara
- Department of Chemistry , Graduate School of Science and Engineering , Saitama University , Shimo-okubo, Sakura-ku , Saitama-city , Saitama 338-8570 , Japan .
| | - Shunsuke Furukawa
- Department of Chemistry , Graduate School of Science and Engineering , Saitama University , Shimo-okubo, Sakura-ku , Saitama-city , Saitama 338-8570 , Japan .
| | - Masahiko Hada
- Department of Chemistry , Graduate School of Science and Engineering , Tokyo Metropolitan University , 1-1 Minami-Osawa, Hachi-Oji , Tokyo , 192-0397 , Japan
| | - Mao Minoura
- Department of Chemistry , School of Science , Rikkyo University , Nishi-Ikebukuro, Toshima-ku , Tokyo , 171-0021 , Japan
| | - Masaichi Saito
- Department of Chemistry , Graduate School of Science and Engineering , Saitama University , Shimo-okubo, Sakura-ku , Saitama-city , Saitama 338-8570 , Japan .
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12
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Rulev AY, Romanov AR. Unsaturated polyfluoroalkyl ketones in the synthesis of nitrogen-bearing heterocycles. RSC Adv 2016. [DOI: 10.1039/c5ra23759a] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
This review focuses on the recent achievements and new developments in the synthesis of polyfluorinated aza-heterocycles based on fluorine-bearing enones and ynones published in the last decade.
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Affiliation(s)
- A. Yu. Rulev
- A. E. Favorsky Institute of Chemistry
- Siberian Division of the Russian Academy of Sciences
- Irkutsk 664033
- Russia
| | - A. R. Romanov
- A. E. Favorsky Institute of Chemistry
- Siberian Division of the Russian Academy of Sciences
- Irkutsk 664033
- Russia
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13
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Lhermet R, Ahmad M, Fressigné C, Silvi B, Durandetti M, Maddaluno J. Carbolithiation of Chloro-Substituted Alkynes: A New Access to Vinyl Carbenoids. Chemistry 2014; 20:10249-54. [DOI: 10.1002/chem.201403605] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Indexed: 11/10/2022]
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14
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Liu C, Ma H, Nie J, Ma J. Retracted: A Facile Synthetic Route to New Fluorinated Building-Blocks of 1-Fluoroalkynes and 1-Fluorodiynes. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201100445] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Bonacorso HG, Andrighetto R, Zanatta N, Martins MA. The unexpected cyclization routes of N,N′-bis(oxotrifluoroalkenyl)-1,3-phenylenediamines in polyphosphoric acid medium. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.05.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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16
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Chen Z, Jiang H, Li Y, Qi C. Highly efficient two-step synthesis of (Z)-2-halo-1-iodoalkenes from terminal alkynes. Chem Commun (Camb) 2010; 46:8049-51. [DOI: 10.1039/c0cc02156c] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Menezes FG, Kolling R, Bortoluzzi AJ, Gallardo H, Zucco C. Hexabromoacetone as tribromoacetylating agent of alcohols and amines and as mediator in the conversion of carboxylic acids into amides in the presence of triphenylphosphine. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.03.093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Synthesis and reactivity of alkenyl- and alkynyl-substituted β,β-dihalo-and β,β,β-trichloroamines. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Martins MAP, Muraro P, Beck P, Machado P, Frizzo CP, Zanatta N, Bonacorso HG. Simplified Approach to the Regiospecific Synthesis of Trichloromethylpyrazolines Using Microwave Irradiation. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910802162926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Marcos A. P. Martins
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Paulo Muraro
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Paulo Beck
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Pablo Machado
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Clarissa P. Frizzo
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Nilo Zanatta
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Helio G. Bonacorso
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
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Martins MAP, Pereira CMP, Moura S, Frizzo CP, Beck P, Zanatta N, Bonacorso HG, Flores AFC. Microwave assisted regiospecific synthesis of 5-trifluoromethyl-4,5-dihydropyrazoles and-pyrazoles. J Heterocycl Chem 2007. [DOI: 10.1002/jhet.5570440537] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Druzhinin SV, Balenkova ES, Nenajdenko VG. Recent advances in the chemistry of α,β-unsaturated trifluoromethylketones. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.04.029] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Zhu S, Jin G, Jiang H. Reactions of β-alkoxyvinyl trifluoromethyl ketones with terminal alkynes Reagent-controlled regioselectivity addition reactions. CAN J CHEM 2005. [DOI: 10.1139/v05-247] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Reactions of β-alkoxyvinyl trifluoromethyl ketones ROCH=CHCOCF3 (1, R = Et, Me2CHCH2), and their cyclic analogues 4-trifluoroacetyl-2,3-dihydrofuran (2a) and 5-trifluoroacetyl-3,4-dihydro-2H-pyran (2b), with terminal alkynes R-C≡CH (3, R = Ph, PhCH2, HOCH2, C5H11) mainly gave the 1,2-addition products (carbonyl alkynylation) in the presence of n-BuLi. However, promoted by ZnCl2Et3N, the reaction of 1 or 2 with equivalent alkyne predominately provided 1,4-addition products.Key words: β-alkoxyvinyl trifluoromethyl ketones, alkynes, 1,2-addition, 1,4-addition, catalysts.
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Five-membered ring systems: with O & N atoms. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0959-6380(05)80333-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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