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Abe N, Fujii H, Nakatani M, Murafuji T, Gunji T, Ikeda R, Konakahara T. Synthesis of Benzotropone-Annulated 1-Azaazulenes and Related Compounds by Suzuki-Miyaura Coupling / Aldol Condensation Cascade Reaction and Evaluations of Their Cytotoxic Activity against HeLa S3 Cells. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abe N, Yoshioka E, Koizumi K, Nakashima K, Fujii H, Murafuji T, Gunji T. Synthesis and Complexation of Bis(1-azaazulen-2-yl)amines and Bis(1-azaazulen-2-yl) Sulfides. HETEROCYCLES 2012. [DOI: 10.3987/com-12-12507] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Kamimura A, Ishikawa S, Noguchi F, Moriyama T, So M, Murafuji T, Uno H. Unexpected formation of stannolanes and trigonal bipyramidal tin complexes by radical cyclization reaction. Chem Commun (Camb) 2012; 48:6592-4. [DOI: 10.1039/c2cc31753b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Matano Y, Kon Y, Saito A, Kimura Y, Murafuji T, Imahori H. Divergent Synthesis of 2,5-Diarylphospholes Based on Cross-coupling Reactions: Substituent Effects on the Optical and Redox Properties of Benzene–Phosphole–Benzene π-Systems. CHEM LETT 2011. [DOI: 10.1246/cl.2011.919] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Chen J, Murafuji T, Tsunashima R. Insertion of Benzyne into a Bi–S Bond: A New Synthetic Route to ortho-Functionalized Bismuthanes and Its Application to the Synthesis of Dibenzothiophene. Organometallics 2011. [DOI: 10.1021/om200228x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Abe N, Yoshioka E, Fujii H, Murafuji T, Ikeda R, Konakahara T, Gunji T. Synthesis of 12,12a-Dihydro-7,12a-diazacyclohepta[cd]benz[g]azulen-12-one (Cyclohepta[mn]pyrrolo[1,2-c][1,4]benzodiazepin-12-one) and Evaluation of Cytotoxic Activity against HeLa S3 Cells. HETEROCYCLES 2011. [DOI: 10.3987/com-11-12207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Murafuji T, Fujiwara Y, Yoshimatsu D, Miyakawa I, Migita K, Mikata Y. Bismuth heterocycles based on a diphenyl sulfone scaffold: synthesis and substituent effect on the antifungal activity against Saccharomyces cerevisiae. Eur J Med Chem 2010; 46:519-25. [PMID: 21177000 DOI: 10.1016/j.ejmech.2010.11.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 11/12/2010] [Accepted: 11/21/2010] [Indexed: 10/18/2022]
Abstract
A series of heterocyclic organobismuth(III) compounds 2 [ClBi(5-R-C6H(3)-2-SO2C6H(4)-1'-): R=Me, Ph, MeO, Cl, H, t-Bu, CF3, F, Me2N] was synthesized in order to study the relative importance of structure and specific substitutions in relation to their lipophilicity and antifungal activity against the yeast Saccharomyces cerevisiae. A clear structure-activity relationship between the size of the inhibition zone and the value of ClogP was found for 2. These results suggest that the higher the lipophilicity, the lower the antifungal activity. Thus, 2e (R=H) and 2h (R=F), which had ClogP values of 1.18 and 1.45, respectively, were most active. In contrast, 2b (R=Ph) and 2f (R=t-Bu) had ClogP values of 3.06 and 3.00, respectively, and exhibited no antifungal activity. Compound 6b ClBi[5-(OH)C6H(3)-2-SO(2)-5'-(OH)C6H(3)-1'-] had an estimated ClogP value of 0.81 but exhibited only low activity in spite of its low ClogP value, suggesting that such a considerable decrease in lipophilicity lowers inhibition activity. Bismuth carboxylate 7b derived from p-nitrobenzoic acid and 2e exhibited inhibition activity comparable to those of 2e and 2h despite its higher lipophilicity (ClogP=2.68).
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Ohshita J, Matsui S, Yamamoto R, Mizumo T, Ooyama Y, Harima Y, Murafuji T, Tao K, Kuramochi Y, Kaikoh T, Higashimura H. Synthesis of Dithienobismoles as Novel Phosphorescence Materials. Organometallics 2010. [DOI: 10.1021/om100560n] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abe N, Fujii H, Nagamatsu K, Gunji T, Murafuji T. The Reaction of [(1-Azaazulen-2-yl)imino]phosphorane with Arylaldehydes: Formation of Bis[(1-azaazulen-2-yl)amino]arylmethanes. HETEROCYCLES 2010. [DOI: 10.3987/com-10-12050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Murafuji T, Sugihara Y, Fujinaga M, Suetake K, Gyoji K, Kurotobi K. An Easy Access to 2-Substituted Azulenes from Azulene-2-boronic Acid Pinacol Ester. SYNTHESIS-STUTTGART 2008. [DOI: 10.1055/s-0028-1083224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Shibasaki T, Ooishi T, Yamanouchi N, Murafuji T, Kurotobi K, Sugihara Y. A New Efficient Route to 2-Substituted Azulenes Based on Sulfonyl Group Directed Lithiation. J Org Chem 2008; 73:7971-7. [DOI: 10.1021/jo801166f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hirakawa S, Kawamata J, Suzuki Y, Tani S, Murafuji T, Kasatani K, Antonov L, Kamada K, Ohta K. Two-Photon Absorption Properties of Azulenyl Compounds Having a Conjugated Ketone Backbone. J Phys Chem A 2008; 112:5198-207. [DOI: 10.1021/jp800415b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mustafizur Rahman AFM, Murafuji T, Shibasaki T, Suetake K, Kurotobi K, Sugihara Y, Azuma N, Mikata Y. Characterization of Azulenylphosphine Derivatives. Unexpected Debromination and Its Synthetic Utility in the Preparation of 2-Substituted Azulene. Organometallics 2007. [DOI: 10.1021/om0607090] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Murafuji T, Azuma T, Miyoshi Y, Ishibashi M, Rahman AFMM, Migita K, Sugihara Y, Mikata Y. Inhibition of jack bean urease by organobismuth compounds. Bioorg Med Chem Lett 2006; 16:1510-3. [PMID: 16406781 DOI: 10.1016/j.bmcl.2005.12.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Revised: 11/30/2005] [Accepted: 12/12/2005] [Indexed: 11/25/2022]
Abstract
Inhibitory activity of organobismuth compounds, triarylbismuthanes 1 and their dihalides 2 and 3, was examined against jack bean urease. Besides triarylbismuth dichlorides 2, triarylbismuth difluorides 3 and bismuthanes 1 exhibited the activity. Of all these compounds, triphenylbismuth difluoride 3a and tris(4-fluorophenyl)bismuth dichloride 2b showed the highest activity. These results indicate that generation of the inhibitory effect is not always governed by the Lewis acidity at the bismuth center. Such a tendency of inhibition by the organobismuth compounds is in good accord with that observed in the antibacterial activity against Helicobacter pylori, suggesting that H. pylori-produced urease may be a therapeutic target by bismuth-based drugs.
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Mustafizur Rahman AFM, Murafuji T, Kurotobi K, Sugihara Y, Azuma N. First Introduction of an Azulenyl Group into the Bismuth and Antimony Center. Synthesis and Structure of Azulenylbismuthanes and Their Difluorides. Organometallics 2004. [DOI: 10.1021/om040053f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rahman AM, Murafuji T, Ishibashi M, Miyoshi Y, Sugihara Y. Effect of π-accepting substituent on the reactivity and spectroscopic characteristics of triarylbismuthanes and triarylbismuth dihalides. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2004.07.055] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ito S, Terazono T, Kubo T, Okujima T, Morita N, Murafuji T, Sugihara Y, Fujimori K, Kawakami J, Tajiri A. Efficient preparation of 2-azulenylboronate and Miyaura-Suzuki cross-coupling reaction with aryl bromides for easy access to poly(2-azulenyl)benzenes. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.04.057] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Murafuji T, Miyoshi Y, Ishibashi M, Mustafizur Rahman AFM, Sugihara Y, Miyakawa I, Uno H. Antifungal activity of organobismuth compounds against the yeast Saccharomyces cerevisiae: structure–activity relationship. J Inorg Biochem 2004; 98:547-52. [PMID: 14987856 DOI: 10.1016/j.jinorgbio.2003.12.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Revised: 12/27/2003] [Accepted: 12/29/2003] [Indexed: 10/26/2022]
Abstract
Antifungal activity of organobismuth(III) and (V) compounds 1-9 was examined against the yeast, Saccharomyces cerevisiae. A clear structure-activity relationship was observed in these compounds. Thus, triarylbismuth dichlorides 2 [(4-YC6H4)3BiCl2: Y=MeO, F, Cl, CF3, CN, NO2] and halobismuthanes 6 [2-(t)BuSO2C6H4(4-YC6H4)BiX: Y=MeO, Me, H, Cl; X=Cl, Br, I], 7 [Bi(X)(C6H4-2-SO2C6H4-1'-): X=Cl, Br, I], 8 [2-Me2NCH2C6H4(Ph)BiX: X=Cl, Br] and 9 [4-MeC6H4(8-Me2NC10H6-1-)BiCl] showed the growth inhibition effect, while triarylbismuth difluorides 3 [(4-YC6H4)3BiF2] and triarylbismuthanes 1 [(4-YC6H4)3Bi], 4 [2-(t)BuSO2C6H4(4-YC6H4)2Bi] and 5 [4-YC6H4Bi(C6H4-2-SO2C6H4-1'-)] were not active at all irrespective of the nature of the substituents. Generation of the inhibition effect is governed by the facility of nucleophilic reaction at the bismuth center and the Lewis acidic bismuth center is an active site. Of all the bismuth compounds attempted, halobismuthanes 7 derived from diphenyl sulfone exhibited the highest activities. An X-ray crystallographic study of 7a [Bi(Cl)(C6H4-2-SO2C6H4-1'-)] revealed that the bismuth center adopts a seven-coordinated geometry, which is unusual in organobismuth(III) compounds, through the intramolecular and intermolecular coordination between the bismuth and oxygen atoms. The marked inhibition effect of 7 may be attributed to such a highly coordinated geometry, which allows the bismuth center to bind tightly with some biomolecules playing important roles in the growth of S. cerevisiae.
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Kurotobi K, Miyauchi M, Takakura K, Murafuji T, Sugihara Y. Direct Introduction of a Boryl Substituent into the 2-Position of Azulene: Application of the Miyaura and Smith Methods to Azulene. European J Org Chem 2003. [DOI: 10.1002/ejoc.200300001] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Murafuji T, Sugihara Y, Kurotobi K, Tabata H, Miyauchi M, Mustafizur RA, Migita K, Shimoyama H, Fujimori K. The First Generation of Azulenyl-Lithium and -Magnesium: A Novel, Versatile Method of Introducing a Substituent at the 2-Position of an Azulene Skeleton. SYNTHESIS-STUTTGART 2003. [DOI: 10.1055/s-2003-36245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Murafuji T, Kurotobi K, Nakamura N, Sugihara Y. Recent Advances in the Synthesis of Optically Active Compounds Bearing a Chiral Heteroatom Center in the Group 13-16 Elements. CURR ORG CHEM 2002. [DOI: 10.2174/1385272023373365] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Murafuji T, Azuma N, Suzuki H. First X-ray Structure Analysis of cis/trans Paired Diastereoisomeric Chlorobismuthanes Bearing a Chiral Bismuth Center Induced by the (R)-1-(Dimethylamino)ethyl Group as a Chiral Source. Unexpected Axial Disposition of the Benzylic Methyl Group Causing the Equilibrium Isomer Ratio in Solution To Be Insensitive to Steric Congestion around the Bismuth Atom. Organometallics 2002. [DOI: 10.1021/om00003a071] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Murafuji T, Mutoh T, Satoh K, Tsunenari K, Azuma N, Suzuki H. Hypervalent Bond Formation in Halogeno(2-acylphenyl)bismuthanes. Organometallics 2002. [DOI: 10.1021/om00008a036] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kurotobi K, Tabata H, Miyauchi M, Murafuji T, Sugihara Y. Coupling Reaction of Azulenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolanes with Haloazulenes. SYNTHESIS-STUTTGART 2002. [DOI: 10.1055/s-2002-31947] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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