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Liu J, Yang S, Dong R, Jin Z, Wang M. A Convenient One-Pot Synthesis of 1-Aryl-Substituted 4-Iodopyrazol-3-Ols via Aromatisation and Oxidative Iodination Reactions. JOURNAL OF CHEMICAL RESEARCH 2018. [DOI: 10.3184/174751918x15161933697808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A convenient and economical one-pot synthesis of a series of new 1-aryl-substituted 4-iodopyrazole-3-ols from easily available pyrazolidin-3-ones in the presence of sodium iodide, 30% solution of hydrogen peroxide and a catalytic amount of sulfuric acid in dichloromethane via aromatisation and oxidative iodination reactions are described. This protocol has the advantages of high atom economy, cost-effectiveness, short reaction time and environmental friendliness.
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Affiliation(s)
- Jingjing Liu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P.R. China
| | - Shanguang Yang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P.R. China
| | - Ruimei Dong
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P.R. China
| | - Zhudan Jin
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P.R. China
| | - Mingliang Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P.R. China
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Kobayashi Y, Kiyotsuka Y, Sugihara Y, Wada K. Installation of the imidazole ring on chiral substrates via allylic substitution. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Exploring the synthetic utility of 1-alkynylimidazoles: regiocontrolled cyclization to diverse imidazoazines and imidazoazoles. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.04.099] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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A simple method for iodination of heterocyclic compounds using HIO4/NaCl/silica gel/H2SO4 in water. MONATSHEFTE FUR CHEMIE 2011. [DOI: 10.1007/s00706-011-0611-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Laroche C, Li J, Kerwin SM. Cytotoxic 1,2-dialkynylimidazole-based aza-enediynes: aza-Bergman rearrangement rates do not predict cytotoxicity. J Med Chem 2011; 54:5059-69. [PMID: 21667990 DOI: 10.1021/jm200289j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new class of potential antitumor agents inspired by the enediyne antitumor antibiotics has been synthesized: the 1,2-dialkynylimidazoles. The aza-Bergman rearrangement of these 1,2-dialkynylimidazoles has been investigated theoretically at the B3LYP/6-31G(d,p) level and experimentally by measuring the kinetics of rearrangement in 1,4-cyclohexadiene. There is a good correlation between the theoretical and experimental results; subtle substituent effects on the initial aza-Bergman cyclization barrier predicted by theory are confirmed by experiment. Yet, despite the ability of these 1,2-dialkynylimidazoles to undergo Bergman rearrangement to diradical/carbene intermediates under relatively mild conditions, there is no correlation between the rate of Bergman cyclization and cytotoxicity to A459 cells. In addition, cytotoxic 1,2-dialkynylimidazoles do not cause nicking of supercoiled plasmid DNA or cleavage of bovine serum albumin. An alternative mechanism for cytotoxicity involving the unexpected selective thiol addition to the N-ethynyl group of certain 1,2-dialkynylimidazoles is proposed.
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Affiliation(s)
- Christophe Laroche
- Division of Medicinal Chemistry, College of Pharmacy, The University of Texas at Austin, Texas 78712, USA
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Zarganes-Tzitzikas T, Neochoritis CG, Stephanidou-Stephanatou J, Tsoleridis CA. Synthesis of 2-Keto-imidazoles Utilizing N-Arylamino-Substituted N-Heterocyclic Carbenes. J Org Chem 2011; 76:1468-71. [DOI: 10.1021/jo102244x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tryfon Zarganes-Tzitzikas
- Department of Chemistry, Laboratory of Organic Chemistry, University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Constantinos G. Neochoritis
- Department of Chemistry, Laboratory of Organic Chemistry, University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Julia Stephanidou-Stephanatou
- Department of Chemistry, Laboratory of Organic Chemistry, University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
| | - Constantinos A. Tsoleridis
- Department of Chemistry, Laboratory of Organic Chemistry, University of Thessaloniki, Thessaloniki 54124, Macedonia, Greece
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DeKorver KA, Li H, Lohse AG, Hayashi R, Lu Z, Zhang Y, Hsung RP. Ynamides: a modern functional group for the new millennium. Chem Rev 2010; 110:5064-106. [PMID: 20429503 DOI: 10.1021/cr100003s] [Citation(s) in RCA: 722] [Impact Index Per Article: 51.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Kyle A DeKorver
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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Dekorver KA, Hsung RP, Lohse AG, Zhang Y. A divergent mechanistic course of Pd(0)-catalyzed aza-Claisen rearrangement and aza-Rautenstrauch-type cyclization of N-allyl ynamides. Org Lett 2010; 12:1840-3. [PMID: 20337418 DOI: 10.1021/ol100446p] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A fascinating mechanistic study of ynamido-palladium-pi-allyl complexes is described that features isolation of a unique silyl ketenimine via aza-Claisen rearrangement, which can be accompanied by an unusual thermal N-to-C 1,3-Ts shift in the formation of tertiary nitriles and a novel cyclopentenimine formation via a palladium-catalyzed aza-Rautenstrauch-type cyclization pathway.
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Affiliation(s)
- Kyle A Dekorver
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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Bellina F, Rossi R. Regioselective Functionalization of the Imidazole Ring via Transition Metal-Catalyzed CN and CC Bond Forming Reactions. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000144] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Evano G, Coste A, Jouvin K. Ynamides: Versatile Tools in Organic Synthesis. Angew Chem Int Ed Engl 2010; 49:2840-59. [DOI: 10.1002/anie.200905817] [Citation(s) in RCA: 672] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Evano G, Coste A, Jouvin K. Inamide: vielseitige Bausteine für die organische Synthese. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200905817] [Citation(s) in RCA: 213] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Li H, Antoline JE, Yang JH, Al-Rashid ZF, Hsung RP. A Stereoselective Intramolecular Cyclopropanation via a De Novo Class of Push-Pull Carbenes Derived from DMDO-Epoxidations of Chiral Ynamides. NEW J CHEM 2010; 34:1309-1316. [PMID: 20668650 DOI: 10.1039/c0nj00063a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work describes the first examples of diastereoselective intramolecular cyclopropanations of a de novo class of push-pull carbenes derived from DMDO-epoxidations of chiral ynamides. This reaction sequence essentially constitutes a tandem epoxidation-cyclopropanation that effectively gives arise to a series of structurally unique amido-cyclopropanes. A plausible mechanistic model is proposed revealing insights into this novel cyclopropanation process.
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Affiliation(s)
- Hongyan Li
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705-2222
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Laroche C, Li J, Gonzales C, David WM, Kerwin SM. Cyclization kinetics and biological evaluation of an anticancer 1,2-dialkynylimidazole. Org Biomol Chem 2010; 8:1535-9. [DOI: 10.1039/b925261d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Laroche C, Kerwin SM. Efficient, Regioselective Access to Bicyclic Imidazo[1,2-x]- Heterocycles via Gold- and Base-Promoted Cyclization of 1-Alkynylimidazoles. J Org Chem 2009; 74:9229-32. [DOI: 10.1021/jo902073m] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Christophe Laroche
- Division of Medicinal Chemistry, College of Pharmacy and Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712
| | - Sean M. Kerwin
- Division of Medicinal Chemistry, College of Pharmacy and Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712
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Li J, Kaoud TS, Laroche C, Dalby KN, Kerwin SM. Synthesis and biological evaluation of p38alpha kinase-targeting dialkynylimidazoles. Bioorg Med Chem Lett 2009; 19:6293-7. [PMID: 19822424 DOI: 10.1016/j.bmcl.2009.09.094] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2009] [Revised: 09/22/2009] [Accepted: 09/24/2009] [Indexed: 12/22/2022]
Abstract
Based on the mild, thermal rearrangement of 1,2-dialkynylimidazoles to reactive carbene or diradical intermediates, a series of 1,2-dialkynylimidazoles were designed as potential irreversible p38 MAP kinase alpha-isoform (p38alpha) inhibitors. The synthesis of these dialkynylimidazoles and their kinase inhibition activity is reported. The 1-ethynyl-substituted dialkynylimidazole 14 is a potent (IC(50)=200 nM) and selective inhibitor of p38alpha. Moreover, compound 14 covalently modifies p38alpha as determined by ESI-MS after 12h incubation at 37 degrees C. The unique kinase inhibition, covalent kinase adduct formation, and minimal CYP450 2D6 inhibition by compound 14 demonstrate that dialkynylimidazoles are a new, promising class of p38alpha inhibitors.
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Affiliation(s)
- Jing Li
- Division of Medicinal Chemistry, College of Pharmacy, The University of Texas at Austin, Austin, TX, USA
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