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Umezaki S, Yokoshima S, Fukuyama T. Correction to Total Synthesis of Lysergic Acid. Org Lett 2014. [DOI: 10.1021/ol500159h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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77
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Fujii M, Nishimura T, Koshiba T, Yokoshima S, Fukuyama T. Correction to 2-Pyridone Synthesis Using 2-(Phenylsulfinyl)acetamide. Org Lett 2014. [DOI: 10.1021/ol500162b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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78
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79
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Adachi Y, Kamei N, Yokoshima S, Fukuyama T. Correction to Total Synthesis of (−)-Histrionicotoxin. Org Lett 2014. [DOI: 10.1021/ol5001632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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80
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Kaise H, Shimokawa J, Fukuyama T. TMSCN/DBU-Mediated Facile Redox Transformation of α,β-Unsaturated Aldehydes to Carboxylic Acid Derivatives. Org Lett 2014; 16:727-9. [DOI: 10.1021/ol403415z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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81
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Ohki Y, Shimada N, Tominaga A, Osawa S, Higo T, Yokoshima S, Fukuyama T, Tomita T, Iwatsubo T. Binding of longer Aβ to transmembrane domain 1 of presenilin 1 impacts on Aβ42 generation. Mol Neurodegener 2014; 9:7. [PMID: 24410857 PMCID: PMC3896738 DOI: 10.1186/1750-1326-9-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 01/10/2014] [Indexed: 11/18/2022] Open
Abstract
Background Amyloid-β peptide ending at 42nd residue (Aβ42) is believed as a pathogenic peptide for Alzheimer disease. Although γ-secretase is a responsible protease to generate Aβ through a processive cleavage, the proteolytic mechanism of γ-secretase at molecular level is poorly understood. Results We found that the transmembrane domain (TMD) 1 of presenilin (PS) 1, a catalytic subunit for the γ-secretase, as a key modulatory domain for Aβ42 production. Aβ42-lowering and -raising γ-secretase modulators (GSMs) directly targeted TMD1 of PS1 and affected its structure. A point mutation in TMD1 caused an aberrant secretion of longer Aβ species including Aβ45 that are the precursor of Aβ42. We further found that the helical surface of TMD1 is involved in the binding of Aβ45/48 and that the binding was altered by GSMs as well as TMD1 mutation. Conclusions Binding between PS1 TMD1 and longer Aβ is critical for Aβ42 production.
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Okano K, Tokuyama H, Fukuyama T. Copper-mediated aromatic amination reaction and its application to the total synthesis of natural products. Chem Commun (Camb) 2014; 50:13650-63. [DOI: 10.1039/c4cc03895a] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The historical background and recent update on copper-mediated aryl amination reactions including the recent C–H aryl amination and its application to the total syntheses of natural products are described.
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83
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Takeuchi R, Shimokawa J, Fukuyama T. Development of a route to chiral epidithiodioxopiperazine moieties and application to the asymmetric synthesis of (+)-hyalodendrin. Chem Sci 2014. [DOI: 10.1039/c3sc53222d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Development of a novel methodology that takes advantage of the bridgehead carbanion and the traceless transfer of the stereochemistry of l-cysteine allowed the first asymmetric synthesis of hyalodendrin.
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84
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Kitahara K, Shimokawa J, Fukuyama T. Stereoselective synthesis of spirotryprostatin A. Chem Sci 2014. [DOI: 10.1039/c3sc52525b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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85
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Ichikawa Y, Chikamori M, Ohtomo Y, Hikota E, Sakamoto Y, Suzuki T, Bidinosti C, Inoue T, Furukawa T, Yoshimi A, Suzuki K, Nanao T, Miyatake H, Tsuchiya M, Yoshida N, Shirai H, Ino T, Ueno H, Matsuo Y, Fukuyama T, Asahi K. Search for electric dipole moment in 129Xe atom using active nuclear spin maser. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146605007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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86
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Kawagishi F, Toma T, Inui T, Yokoshima S, Fukuyama T. Total synthesis of ecteinascidin 743. J Am Chem Soc 2013; 135:13684-7. [PMID: 24001124 DOI: 10.1021/ja408034x] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A straightforward synthesis of ecteinascidin 743 was accomplished from readily available l-glutamic acid as a single chiral source. Our novel synthesis features a concise and convergent approach for construction of the B-ring, consisting of a sequence involving a stereoselective Heck reaction between a diazonium salt and an enamide, oxidative cleavage of the resulting alkene, and intramolecular ortho substitution of the phenol by an aldehyde.
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87
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Nishino R, Fukuyama T, Tajima Y, Miyashita L, Watanabe Y, Ueda H, Kosaka T. Prior oral exposure to environmental immunosuppressive chemicals methoxychlor, parathion, or piperonyl butoxide aggravates allergic airway inflammation in NC/Nga mice. Toxicology 2013; 309:1-8. [PMID: 23583882 DOI: 10.1016/j.tox.2013.03.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/28/2013] [Accepted: 03/29/2013] [Indexed: 01/06/2023]
Abstract
BACKGROUND Immunosuppressive environmental chemicals may increase the potency of allergens and thereby play a role in the development of respiratory tract allergies, such as allergic rhinitis and asthma. OBJECTIVES We investigated the association between environmental immunosuppressive chemicals and the allergic airway inflammation development. METHODS We used a mouse model of ovalbumin (OVA)-induced allergic airway inflammation. NC/Nga mice were exposed orally to pesticides parathion (an organophosphate compound) or methoxychlor (an organochlorine compound), or to an insecticide synergist piperonyl butoxide, prior to OVA intraperitoneal sensitization and inhalation challenge. We assessed serum IgE levels, B-cell counts, cytokine production, IgE production in hilar lymph nodes, eosinophil counts, chemokine levels in bronchoalveolar lavage fluid, and cytokine gene expression in the lung. RESULTS Exposure to environmental immunosuppressive chemicals markedly increased serum IgE - IgE-positive B-cells, IgE and cytokines in lymph nodes - eosinophils and chemokines in BALF - IL-10a and IL-17 in the lung. CONCLUSIONS Allergic airway inflammation can be aggravated by prior exposure to immunosuppressive environmental chemicals.
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89
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Fukuyama T, Rahman MT, Kamata N, Tokizane M, Fukuda Y, Ryu I. Continuous Microflow Bromination of Alkenes Combined with a Circulatory Recycling of a Fluorous Polyether as a Bromine Support. J Flow Chem 2013. [DOI: 10.1556/jfc-d-12-00023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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90
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Nishimura T, Unni AK, Yokoshima S, Fukuyama T. Total syntheses of lyconadins A-C. J Am Chem Soc 2013; 135:3243-7. [PMID: 23330605 DOI: 10.1021/ja312065m] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The total synthesis of the Lycopodium alkaloid lyconadin A was accomplished and it was applied to the total syntheses of the related congeners, lyconadins B and C. Lyconadin A has attracted attention as a challenging target for total synthesis due to the unprecedented pentacyclic skeleton. Our synthesis of lyconadin A features a facile construction of the highly fused tetracyclic skeleton through a combination of an aza-Prins reaction and an electrocyclic ring opening, followed by formation of a C-N bond. Transformation of the bromoalkene moiety of the tetracycle to a key enone intermediate was extensively investigated, and three methods via sulfide, oxime, or azide intermediates were established. A pyridone ring was constructed from the key enone intermediate to complete the synthesis of lyconadin A. A dihydropyridone ring could also be formed from the same enone intermediate, leading to a synthesis of lyconadin B. Establishment of the conditions for an electrocyclic ring opening without formation of the C-N bond resulted in completion of the total synthesis of lyconadin C.
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91
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Yamagishi K, Iso H, Kokubo Y, Saito I, Yatsuya H, Ishihara J, Inoue M, Tsugane S, Sobue T, Hanaoka T, Ogata J, Baba S, Mannami T, Okayama A, K. Y, Miyakawa K, Saito F, Koizumi A, Sano Y, Hashimoto I, Ikuta T, Tanaba Y, Miyajima Y, Suzuki N, Nagasawa S, Furusugi Y, Nagai N, Sanada H, Hatayama Y, Kobayashi F, Uchino H, Shirai Y, Kondo T, Sasaki R, Watanabe Y, Miyagawa Y, Kobayashi Y, Machida M, Kishimoto Y, Takara E, Fukuyama T, Kinjo M, Irei M, Sakiyama H, Imoto K, Yazawa H, Seo T, Seiko A, Ito F, Shoji F, Saito R, Murata A, Minato K, Motegi K, Fujieda T, Abe T, Katagiri M, Suzuki M, Matsui K, Doi M, Terao A, Ishikawa Y, Tagami T, Doi H, Urata M, Okamoto N, Ide F, Sueta H, Sakiyama H, Onga N, Takaesu H, Uehara M, Horii F, Asano I, Yamaguchi H, Aoki K, Maruyama S, Ichii M, Takano M, Matsushima S, Natsukawa S, Akabane M, Konishi M, Okada K, Honda Y, Sakurai KYS, Tsuchiya N, Sugimura H, Tsubono Y, Kabuto M, Tominaga S, Iida M, Ajiki W, Ioka A, Sato S, Yasuda N, Nakamura K, Kono S, Suzuki K, Takashima Y, Yoshida M, Maruyama E, Yamaguchi M, Matsumura Y, Sasaki S, Watanabe S, Kadowaki T, Noda M, Mizoue T, Kawaguchi Y, Shimizu H. Dietary intake of saturated fatty acids and incident stroke and coronary heart disease in Japanese communities: the JPHC Study. Eur Heart J 2013; 34:1225-32. [DOI: 10.1093/eurheartj/eht043] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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92
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Imamura Y, Umezawa N, Osawa S, Shimada N, Higo T, Yokoshima S, Fukuyama T, Iwatsubo T, Kato N, Tomita T, Higuchi T. Effect of Helical Conformation and Side Chain Structure on γ-Secretase Inhibition by β-Peptide Foldamers: Insight into Substrate Recognition. J Med Chem 2013; 56:1443-54. [DOI: 10.1021/jm301306c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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93
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Oakdale JS, Fokin VV, Umezaki S, Fukuyama T. Preparation of 1,5-Disubstituted 1,2,3-Triazoles via Ruthenium-catalyzed Azide Alkyne Cycloaddition. ACTA ACUST UNITED AC 2013; 90:96-104. [PMID: 25253916 DOI: 10.15227/orgsyn.090.0096] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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94
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Iwai Y, Ozaki T, Takita R, Uchiyama M, Shimokawa J, Fukuyama T. Modified McFadyen–Stevens reaction for a versatile synthesis of aliphatic/aromatic aldehydes: design, optimization, and mechanistic investigations. Chem Sci 2013. [DOI: 10.1039/c2sc22045h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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95
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Fujii M, Nishimura T, Koshiba T, Yokoshima S, Fukuyama T. 2-Pyridone Synthesis Using 2-(Phenylsulfinyl)acetamide. Org Lett 2012; 15:232-4. [DOI: 10.1021/ol303320c] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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96
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Uchida K, Ogawa T, Yasuda Y, Mimura H, Fujimoto T, Fukuyama T, Wakimoto T, Asakawa T, Hamashima Y, Kan T. Stereocontrolled total synthesis of (+)-UCS1025A. Angew Chem Int Ed Engl 2012; 51:12850-3. [PMID: 23143644 DOI: 10.1002/anie.201207800] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Indexed: 11/12/2022]
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97
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Uchida K, Ogawa T, Yasuda Y, Mimura H, Fujimoto T, Fukuyama T, Wakimoto T, Asakawa T, Hamashima Y, Kan T. Stereocontrolled Total Synthesis of (+)-UCS1025A. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207800] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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98
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Shimada N, Abe Y, Yokoshima S, Fukuyama T. Total Synthesis of (−)-Lycoposerramine-S. Angew Chem Int Ed Engl 2012; 51:11824-6. [DOI: 10.1002/anie.201206863] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Indexed: 11/08/2022]
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99
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Shimada N, Abe Y, Yokoshima S, Fukuyama T. Total Synthesis of (−)-Lycoposerramine-S. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206863] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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100
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Fukuyama T, Kosaka T, Miyashita L, Nishino R, Wada K, Hayashi K, Ueda H, Harada T. Role of regulatory T cells in the induction of atopic dermatitis by immunosuppressive chemicals. Toxicol Lett 2012; 213:392-401. [DOI: 10.1016/j.toxlet.2012.07.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Revised: 07/18/2012] [Accepted: 07/19/2012] [Indexed: 01/07/2023]
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