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Chen MY, Charvet S, Payard PA, Perrin MEL, Vantourout JC. Electrochemically Driven Nickel-Catalyzed Halogenation of Unsaturated Halide and Triflate Derivatives. Angew Chem Int Ed Engl 2024; 63:e202311165. [PMID: 37930784 DOI: 10.1002/anie.202311165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/09/2023] [Accepted: 11/03/2023] [Indexed: 11/07/2023]
Abstract
A robust electrochemically driven nickel-catalyzed halogen exchange of unsaturated halides and triflates (Br to Cl, I to Cl, I to Br, and OTf to Cl) is reported. A combination of NiCl2 ⋅ glyme as the precatalyst, 2,2'-bipyridine as a ligand, NMP as the solvent, and electrochemistry allowed the generation of a nickel species that promotes reductive elimination of the desired product. This paired electrochemical halogenation is compatible with a range of unsaturated halides and triflates, including heterocycles, dihaloarenes, and alkenes with good functional-group tolerance. Joint experimental and theoretical mechanistic investigations highlighted three catalytic events: i) oxidative addition of the aryl halide to a Ni(0) species to deliver a Ni(II) intermediate; ii) halide metathesis at Ni(II); iii) electrochemical oxidation of Ni(II) to Ni(III) to enable the formation of the desired aryl halide upon reductive elimination. This methodology allows the replacement of heavy halogens (I or Br) or polar atoms (O) with the corresponding lighter and more lipophilic Cl group to block undesired reactivity or modify the properties of drug and agrochemical candidates.
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Affiliation(s)
- Ming-Yu Chen
- UMR 5246, ICBMS, Université de Lyon, Université Claude Bernard Lyon I, CNRS, INSA, CPE Lyon, 1 rue Victor Grignard, 69622, Villeurbanne cedex, France
| | - Sylvain Charvet
- UMR 5246, ICBMS, Université de Lyon, Université Claude Bernard Lyon I, CNRS, INSA, CPE Lyon, 1 rue Victor Grignard, 69622, Villeurbanne cedex, France
| | - Pierre-Adrien Payard
- UMR 5246, ICBMS, Université de Lyon, Université Claude Bernard Lyon I, CNRS, INSA, CPE Lyon, 1 rue Victor Grignard, 69622, Villeurbanne cedex, France
| | - Marie-Eve L Perrin
- UMR 5246, ICBMS, Université de Lyon, Université Claude Bernard Lyon I, CNRS, INSA, CPE Lyon, 1 rue Victor Grignard, 69622, Villeurbanne cedex, France
| | - Julien C Vantourout
- UMR 5246, ICBMS, Université de Lyon, Université Claude Bernard Lyon I, CNRS, INSA, CPE Lyon, 1 rue Victor Grignard, 69622, Villeurbanne cedex, France
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2
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Oechsner RM, Lindenmaier IH, Fleischer I. Nickel Catalyzed Cross-Coupling of Aryl and Alkenyl Triflates with Alkyl Thiols. Org Lett 2023; 25:1655-1660. [PMID: 36877862 DOI: 10.1021/acs.orglett.3c00218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
We report a nickel catalyzed C-S cross-coupling of aryl and alkenyl triflates with alkyl thiols. A variety of the corresponding thioethers were synthesized using an air-stable nickel precatalyst under mild reaction conditions with short reaction times. A broad substrate scope, including pharmaceutically relevant compounds, could be demonstrated.
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Affiliation(s)
- Regina M Oechsner
- Institute of Organic Chemistry, Faculty of Science, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Ivo H Lindenmaier
- Institute of Organic Chemistry, Faculty of Science, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Ivana Fleischer
- Institute of Organic Chemistry, Faculty of Science, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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3
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Yamamoto Y, Shi Y, Masui T, Saito D, Inoue T, Sato H, Dohi C, Muneta E, Shang R, Nakamoto M. Synthesis and Characterization of Hypervalent Pentacoordinate Carbon Compounds Bearing a 7-6-7-Ring Skeleton. Chemistry 2023; 29:e202203162. [PMID: 36372771 DOI: 10.1002/chem.202203162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/07/2022] [Accepted: 11/11/2022] [Indexed: 11/15/2022]
Abstract
To stabilize SN 2 transition state-like penta-coordinate carbon species, triaryl-substituted cationic carbon compounds bearing a moderately flexible 7-6-7-ring skeleton with sulfur donors were synthesized and characterized. Electronic effects of para substituents (R=Cl, F, H, CH3 , SMe, OMe) of the two equatorial aryl groups bound to the cationic central carbon were investigated systematically along with a planar bidentate thioxanthene derivative. X-ray analysis on their solid-state structures showed that the parent (R=H), chloro-, fluoro- and methyl-derivatives were tetracoordinate carbon (sulfonium) structures, while the p-MeO and thioxanthenyl system were pentacoordinate carbocation structures. The Hammett substituent constants for the para substituents (σp + ) correlates well with the bonding in these compounds. The methylthio-derivative with intermediate Hammett substituent constants (p-MeS; σp + =-0.60) showed a tetracooridnate solid-state structure, though solution UV-Vis properties suggested the presence of a penta-coordinate structure. These findings amount to the first unambiguous solution evidence of the hypervalent apical 3c-4e interactions in pentacoordinate carbon compounds.
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Affiliation(s)
- Yohsuke Yamamoto
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Yuan Shi
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Takashi Masui
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Daigo Saito
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Tatsuya Inoue
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Hitomi Sato
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Chisato Dohi
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Emiko Muneta
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Rong Shang
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
| | - Masaaki Nakamoto
- Graduated School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima, 739-8526, Japan
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Chai J, Nie Y, Wang Z, Cheng L, Liu YG, Wu J. Metal Free Access to Polysubstituted Pyrimidines via Nitrile Activation and [2+2+2] Cycloaddition. Chemistry 2021; 27:17565-17569. [PMID: 34626013 DOI: 10.1002/chem.202103219] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Indexed: 11/08/2022]
Abstract
Tf2 O mediated intermolecular / intramolecular [2+2+2] cycloaddition between alkynes and nitriles has been developed for efficient construction of polysubstituted pyrimidines and bicyclopyrimidines. In presence of Tf2 O, aza-allene species were generated in situ through nitrile activation and subsequently participated in the [2+2+2] cycloaddition, which was fully supported by deuteration experiments. The reaction had good substrate extensibility with moderate to excellent yield including trimethylsilylalkynes. The method was utilized as a synthetic tool in the preparation of a luminescent metal complex.
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Affiliation(s)
- Jinkui Chai
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Yu Nie
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Zhao Wang
- Henan University of Animal Husbandry and Economy, Zhengzhou, 450001, P. R. China
| | - Li Cheng
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Ying-Guo Liu
- Division of Molecular Catalysis & Synthesis, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Junliang Wu
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
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5
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Kawamoto T, Ikeda S, Kamimura A. Synthesis of 1-(1-Arylvinyl)pyridin-2(1 H)-ones from Ketones and 2-Fluoropyridine. J Org Chem 2021; 86:13783-13789. [PMID: 34547204 DOI: 10.1021/acs.joc.1c01615] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We describe a simple and efficient procedure for the synthesis of N-vinyl-substituted pyridones from ketones and 2-fluoropyridine in the presence of trifluoromethane sulfonic anhydride, followed by a base treatment. Various ketones with electron-donating or electron-withdrawing groups at the benzene rings can be used in this reaction. A preliminary mechanistic study indicates that it is not very likely that both vinyl triflates and vinyl cations play major roles as intermediates in this transformation.
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Affiliation(s)
- Takuji Kawamoto
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
| | - Shunya Ikeda
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
| | - Akio Kamimura
- Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
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Fuji M, Obora Y. FeCl 3-Assisted Niobium-Catalyzed Cycloaddition of Nitriles and Alkynes: Synthesis of Alkyl- and Arylpyrimidines Based on Independent Functions of NbCl 5 and FeCl 3 Lewis Acids. Org Lett 2017; 19:5569-5572. [PMID: 28968133 DOI: 10.1021/acs.orglett.7b02708] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
NbCl5-catalyzed [2 + 2 + 2] cycloaddition of nitriles with alkynes was used to synthesize pyrimidine derivatives. In this reaction, the use of individual Lewis acids, namely NbCl5 and FeCl3, is a key strategy for achieving the reaction using a catalytic amount of NbCl5. The roles of the two Lewis acids were investigated using FT-IR spectroscopy. The results showed that NbCl5 served as an efficient Lewis acid catalyst for nitrile activation, whereas FeCl3 showed stronger Lewis acidity toward pyrimidines, releasing NbCl5 into the catalytic cycle.
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Affiliation(s)
- Maito Fuji
- Department of Chemistry and Material Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University , Suita, Osaka 564-8680, Japan
| | - Yasushi Obora
- Department of Chemistry and Material Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University , Suita, Osaka 564-8680, Japan
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7
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Yagyu T, Takemoto Y, Yoshimura A, Zhdankin VV, Saito A. Iodine(III)-Catalyzed Formal [2 + 2 + 1] Cycloaddition Reaction for Metal-Free Construction of Oxazoles. Org Lett 2017; 19:2506-2509. [DOI: 10.1021/acs.orglett.7b00742] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuma Yagyu
- Division
of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and
| | - Yusuke Takemoto
- Division
of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and
| | - Akira Yoshimura
- Department
of Chemistry and Biochemistry, University of Minnesota, Duluth, Minnesota 55812 United States
| | - Viktor V. Zhdankin
- Department
of Chemistry and Biochemistry, University of Minnesota, Duluth, Minnesota 55812 United States
| | - Akio Saito
- Division
of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and
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Kurosawa F, Nakano T, Soeta T, Endo K, Ukaji Y. (Z)-Selective Enol Triflation of α-Alkoxyacetoaldehydes: Application to Synthesis of (Z)-Allylic Alcohols via Cross-Coupling Reaction and [1,2]-Wittig Rearrangement. J Org Chem 2015; 80:5696-703. [PMID: 25970239 DOI: 10.1021/acs.joc.5b00647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereoselective transformation of α-alkoxyacetoaldehydes to the corresponding (Z)-vinyl triflates was achieved by treatment with phenyl triflimide and DBU. The stereochemistry was explained by the "syn-effect," which was attributed primarily to an σ → π* interaction. The β-alkoxy vinyl triflates obtained were applied to the stereoselective synthesis of structurally diverse (Z)-allylic alcohols via transition metal-catalyzed cross-coupling reaction and [1,2]-Wittig rearrangement.
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Affiliation(s)
- Fumiya Kurosawa
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takeo Nakano
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takahiro Soeta
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Kohei Endo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Yutaka Ukaji
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
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9
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Záborský O, Šoral M, Fischer R. Application of the Tf2O/2-chloropyridine couple in the synthesis of novel 4,5-unsubstituted N-carbamoyl-2,3-dihydroisoxazoles. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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10
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Trieu TH, Dong J, Shi XX, Lu X, Zhang Q. Efficient and Benign One-Pot Conversion of N-Tosyl-1,4,5,6-tetrahydropyrimidines to Pyrimidines via Tandem β-Elimination and Aromatization. SYNTHETIC COMMUN 2013. [DOI: 10.1080/00397911.2013.764433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Tien Ha Trieu
- a Department of Pharmaceutical Engineering , School of Pharmacy, East China University of Science and Technology , Shanghai , China
| | - Jing Dong
- a Department of Pharmaceutical Engineering , School of Pharmacy, East China University of Science and Technology , Shanghai , China
| | - Xiao-Xin Shi
- a Department of Pharmaceutical Engineering , School of Pharmacy, East China University of Science and Technology , Shanghai , China
| | - Xia Lu
- a Department of Pharmaceutical Engineering , School of Pharmacy, East China University of Science and Technology , Shanghai , China
| | - Qiang Zhang
- a Department of Pharmaceutical Engineering , School of Pharmacy, East China University of Science and Technology , Shanghai , China
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11
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Saito A, Taniguchi A, Kambara Y, Hanzawa Y. Metal-Free [2 + 2 + 1] Annulation of Alkynes, Nitriles, and Oxygen Atoms: Iodine(III)-Mediated Synthesis of Highly Substituted Oxazoles. Org Lett 2013; 15:2672-5. [DOI: 10.1021/ol4009816] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Akio Saito
- Division of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and Laboratory of Organic Reaction Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida-shi, Tokyo 194-8543, Japan
| | - Akihiro Taniguchi
- Division of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and Laboratory of Organic Reaction Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida-shi, Tokyo 194-8543, Japan
| | - Yui Kambara
- Division of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and Laboratory of Organic Reaction Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida-shi, Tokyo 194-8543, Japan
| | - Yuji Hanzawa
- Division of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and Laboratory of Organic Reaction Chemistry, Showa Pharmaceutical University, 3-3165 Higashi-tamagawagakuen, Machida-shi, Tokyo 194-8543, Japan
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12
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The indium-catalysed hydration of alkynes using substoichiometric amounts of PTSA as additive. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.03.079] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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García Martínez A, Teso Vilar E, Moreno-Jiménez F, Álvarez García AM. A novel modification of the Ritter reaction: stereoselective synthesis of bridgehead-fused Δ2-norbornanethiazolines from thiocamphor and thiofenchone. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Saez R, Batanero B, Barba F. Influence of the concentration in the anodic oxidations of α-chloro-ethylbenzene or toluene in acetonitrile. Electrochem commun 2006. [DOI: 10.1016/j.elecom.2006.07.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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15
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Herrera A, Martı́nez-Álvarez R, Chioua R, Benabdelouahab F, Chioua M. Two simple and different approaches to the synthesis of new 2,4-dialkylamino substituted 6,7-dihydro-5H-benzocyclohepta[1,2-d]pyrimidines. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.04.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Palladium-catalyzed cross-coupling reaction of anilinium hypophosphite with alkenyl bromides and triflates: application to the synthesis of GABA analogs. J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(02)01271-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Herrera A, Martı́nez-Álvarez R, Ramiro P, Chioua M, Torres R. On the mechanism of reaction between ketones and nitriles. Unexpected results from benzyl nitriles. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00327-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Garçon S, Vassiliou S, Cavicchioli M, Hartmann B, Monteiro N, Balme G. An Effective One-Pot Synthesis of 3-Benzylfurans and Their Potential Utility as Versatile Precursors of 3,4-Dibenzyltetrahydrofuran Lignans. Formal Synthesis of (±)-Burseran. J Org Chem 2001; 66:4069-73. [PMID: 11375040 DOI: 10.1021/jo0017990] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S Garçon
- Laboratoire de Chimie Organique 1, CNRS UMR 5622, Université Claude Bernard, Lyon I, CPE 43, Bd du 11 Novembre 1918, 69622 Villeurbanne, France
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Qing FL, Fan J. A suzuki coupling approach to trifluoromethyl derivative of targretin (LGD 1069). Bioorg Med Chem Lett 1997. [DOI: 10.1016/s0960-894x(97)00382-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Rahm R, Maas G. Synthesis of pyrimidines from 3-trifluoromethylsulfonyl-oxypropeniminium triflates and nitriles; molecular and crystal structure of the 1:1 and 1:2 Adducts of a 4-(2-diethylaminovinyl)pyrimidine with triflic acid. J Heterocycl Chem 1996. [DOI: 10.1002/jhet.5570330237] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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21
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Ratemi ES, Namdev N, Gibson MS. Pyridine and pyrimidine ring syntheses from 4-(4-morpholino)-3-pentenone and from ethyl 3-(4-morpholino)-2-butenoate. J Heterocycl Chem 1993. [DOI: 10.1002/jhet.5570300609] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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