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Kamo S, Kuramochi K, Tsubaki K. Bioinspired Synthesis of Juglorubin from Juglomycin C. Org Lett 2018; 20:1082-1085. [DOI: 10.1021/acs.orglett.7b04051] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Matsumoto C, Shinohara N, Furuta RA, Tanishige N, Shimojima M, Matsubayashi K, Nagai T, Tsubaki K, Satake M. Investigation of antibody to severe fever with thrombocytopenia syndrome virus (SFTSV) in blood samples donated in a SFTS-endemic area in Japan. Vox Sang 2018; 113:297-299. [PMID: 29359332 DOI: 10.1111/vox.12629] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 12/13/2017] [Accepted: 12/13/2017] [Indexed: 11/30/2022]
Abstract
The risk of transfusion-transmitted infection (TTI) for severe fever with thrombocytopenia syndrome virus (SFTSV) is a concern because person-to-person transmission resulting from contact with SFTSV-contaminated blood has been reported. To obtain information regarding the risk of TTI-SFTSV, antibody testing was performed for blood samples donated in an severe fever with thrombocytopenia syndrome-endemic area in Japan. No antibody-positive samples were detected among 3990 samples. This finding suggested that there were few cases of SFTSV infection among donors and that the risk of TTI-SFTSV was also estimated low in Japan.
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Kuramochi K, Komori K, Mizutani S, Tsubaki K. Syntheses of Naturally Occurring Lactams by the Use of Darzens Reaction. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Sasaki S, Azuma E, Sasamori T, Tokitoh N, Kuramochi K, Tsubaki K. Formation of Phenalenone Skeleton by an Unusual Rearrangement Reaction. Org Lett 2017; 19:4846-4849. [PMID: 28846422 DOI: 10.1021/acs.orglett.7b02305] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The frame rearrangement reaction of dinaphthyl ketones, possessing hydroxy groups at appropriate positions, into phenalenone derivatives under acidic conditions was discovered serendipitously. Although this rearrangement had limited scope, its mechanism was unusual, involving the division of naphthalene rings into one phenalenone ring and one benzene ring. The reaction mechanism was elucidated by direct determination of intermediate structures using 1H NMR measurements. The generated phenalenones are expected to be key intermediates toward natural products and functional materials.
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Shouda T, Nakanishi K, Sasamori T, Tokitoh N, Kuramochi K, Tsubaki K. Synthesis and Structures of Zigzag Shaped [12]Cyclo-p-phenylene Composed of Dinaphthofuran Units and Biphenyl Units. J Org Chem 2017; 82:7850-7855. [PMID: 28675033 DOI: 10.1021/acs.joc.7b01053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A [12]Cyclo-p-phenylene 9 composed of dinaphthofuran units and biphenyl units was synthesized through reductive elimination of the corresponding trinuclear complex by applying Yamago's method. The X-ray crystallographic analyses of 9 revealed that it adopts a zigzag conformation in the solid state. The UV-vis and fluorescence measurements of compound 9 indicated that it also preferentially took a zigzag conformation in the solution state.
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Ota C, Furukawa T, Shima K, Sano S, Kuramochi K, Tsubaki K, Noguchi S, Takano K. Alkyne Tagged Raman Probes for Protein by Chemical Modification Approach. ChemistrySelect 2017. [DOI: 10.1002/slct.201601949] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Kawamura M, Kamo S, Azuma S, Kubo K, Sasamori T, Tokitoh N, Kuramochi K, Tsubaki K. Skeletal Rearrangements of Polycyclic α-Ketols. Org Lett 2017; 19:301-303. [DOI: 10.1021/acs.orglett.6b03541] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Kamo S, Yoshioka K, Kuramochi K, Tsubaki K. Total Syntheses of Juglorescein and Juglocombins A and B. Angew Chem Int Ed Engl 2016; 55:10317-20. [DOI: 10.1002/anie.201604765] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Indexed: 11/08/2022]
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34
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Kamo S, Yoshioka K, Kuramochi K, Tsubaki K. Total Syntheses of Juglorescein and Juglocombins A and B. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604765] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Mizutani S, Komori K, Taniguchi T, Monde K, Kuramochi K, Tsubaki K. A Bioinspired Synthesis of (±)-Rubrobramide, (±)-Flavipucine, and (±)-Isoflavipucine. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602910] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Mizutani S, Komori K, Taniguchi T, Monde K, Kuramochi K, Tsubaki K. A Bioinspired Synthesis of (±)-Rubrobramide, (±)-Flavipucine, and (±)-Isoflavipucine. Angew Chem Int Ed Engl 2016; 55:9553-6. [DOI: 10.1002/anie.201602910] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Indexed: 11/12/2022]
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Yamagami A, Ishimura H, Katori A, Kuramochi K, Tsubaki K. Syntheses and properties of the V-shaped dimeric xanthene dyes. Org Biomol Chem 2016; 14:10963-10972. [DOI: 10.1039/c6ob01967f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Two new types of V-shaped dimeric xanthene fluorescent dyes were synthesized and evaluated in terms of their optical properties.
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Itoh Y, Suzuki M, Matsui T, Ota Y, Hui Z, Tsubaki K, Suzuki T. False HDAC Inhibition by Aurone Compound. Chem Pharm Bull (Tokyo) 2016; 64:1124-8. [DOI: 10.1248/cpb.c16-00123] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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40
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Kuramochi K, Matsushita T, Tsubaki K. Catch and release of concanavalin A by a mannose-immobilized photoaffinity PEGA resin coupled with a cleavable disulfide linker. Biosci Biotechnol Biochem 2015; 79:1946-53. [PMID: 26115105 DOI: 10.1080/09168451.2015.1060848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A photoaffinity PEGA resin containing mannose as a ligand and disulfide as a cleavable linker was prepared. The resin was crosslinked to concanavalin A, a binding protein of mannose, by UV irradiation, and the protein was subsequently released by cleavage of the disulfide linker.
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Ota M, Sasamori T, Tokitoh N, Onodera T, Mizushina Y, Kuramochi K, Tsubaki K. Synthesis, Photochemical Properties, and Cytotoxicities of 2H-Naphtho[1,2-b]pyran and Its Photodimers. J Org Chem 2015; 80:5687-95. [PMID: 25927340 DOI: 10.1021/acs.joc.5b00645] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A 2H-naphtho[1,2-b]pyran, prepared by dimerization of 2-bromo-3-methyl-1,4-naphthoquinone and O-methylation, readily undergoes solid-state [2 + 2] photodimerization to give a photodimer in excellent yield and with excellent selectivity. Retro [2 + 2] cycloaddition can be achieved by irradiation of a solution of the photodimer in chloroform. Interestingly, the 2H-naphtho[1,2-b]pyran dimerizes with a skeletal rearrangement to afford 2,5-dihydro-1-benzoxepin dimers upon irradiation in methanol or via irradiation with hexamethylditin. Furthermore, treatment of the resulting dimers with triethylamine regenerates the 2H-naphtho[1,2-b]pyran monomer. Significant differences in the color, fluorescence, and cytotoxic properties of the monomer and dimers were observed.
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Kuramochi K, Tsubaki K. Synthesis and structural characterization of natural benzofuranoids. JOURNAL OF NATURAL PRODUCTS 2015; 78:1056-1066. [PMID: 25906402 DOI: 10.1021/np5010483] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The synthesis of ustusoranes A, B, and E, pergillin, dihydropergillin, (±)-penicisochroman A, and (-)-brassicadiol, starting from optically active (R)-benzolactone, is described. The synthesis of ustusoranes A and E established the absolute configurations of these natural products. The synthesis of pergillin and (±)-penicisochroman A led to the structural revision of aspergiones E and F. This study clearly indicates that (R)-benzolactone is a potential intermediate in the synthesis of natural benzofuranoids.
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Onodera T, Kuriyama I, Sakamoto Y, Kawamura M, Kuramochi K, Tsubaki K, Tabata A, Naganune H, Mizushina Y. 5-O-Acyl plumbagins inhibit DNA polymerase activity and suppress the inflammatory response. Arch Biochem Biophys 2015; 573:100-10. [DOI: 10.1016/j.abb.2015.02.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Revised: 02/06/2015] [Accepted: 02/25/2015] [Indexed: 01/31/2023]
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Katori A, Azuma E, Ishimura H, Kuramochi K, Tsubaki K. Fluorescent Dyes with Directly Connected Xanthone and Xanthene Units. J Org Chem 2015; 80:4603-10. [DOI: 10.1021/acs.joc.5b00479] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nakanishi K, Fukatsu D, Takaishi K, Tsuji T, Uenaka K, Kuramochi K, Kawabata T, Tsubaki K. Oligonaphthofurans: fan-shaped and three-dimensional π-compounds. J Am Chem Soc 2014; 136:7101-9. [PMID: 24738696 DOI: 10.1021/ja502209w] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Using a bottom-up method, we prepared a series of oligonaphthofurans composed of alternating naphthalene rings and furan rings. The largest compound (compound 25) contained 8 naphthalene units and 7 furan units. DFT calculations revealed that these compounds were fan-shaped molecules and each naphthalene ring was oriented in an alternate mountain-valley fold conformation because of steric repulsion by the hydrogens at the peri-positions. We investigated the optical properties that derived from their fan-shaped and mountain-valley sequences. As the number of aromatic rings of the oligonaphthofurans increased, the peaks of the longest wavelength absorptions in the UV-vis spectra (HOMO-LUMO energy gap) of these compounds steadily red-shifted, although the shapes of spectra were not sustained because of the decreasing molar absorption coefficients (ε's) of their λ(max). We compared our results with those reported for other types of oligoaromatic compounds such as acenes 1, ethene-bridged p-phenylenes 2, rylenes 3, oligofurans 4, and oligonaphthalenes 5. The slopes of the plots between the transition energies (HOMO-LUMO energy gap) of the oligoaromatic compounds and the reciprocal of the number of aromatic rings indicated that the efficiency of π conjugation of the oligonaphthofurans was comparable with that of linear and rigid acenes and rylenes. The higher-order compounds 22 and 25 aggregated even under high dilution conditions (~10(-6) M).
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Nakanishi K, Sasamori T, Kuramochi K, Tokitoh N, Kawabata T, Tsubaki K. Synthesis and Properties of Butterfly-Shaped Expanded Naphthofuran Derivatives. J Org Chem 2014; 79:2625-31. [DOI: 10.1021/jo500085a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Komori K, Taniguchi T, Mizutani S, Monde K, Kuramochi K, Tsubaki K. Short Synthesis of Berkeleyamide D and Determination of the Absolute Configuration by the Vibrational Circular Dichroism Exciton Chirality Method. Org Lett 2014; 16:1386-9. [DOI: 10.1021/ol500148g] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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48
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Azuma S, Ota M, Ishida A, Isozaki K, Takaya H, Nakamura M, Sasamori T, Tokitoh N, Kuramochi K, Tsubaki K. Dimerization Reactions of 2-Bromo-3,5,6-trimethyl-1,4-benzoquinone. CHEM LETT 2013. [DOI: 10.1246/cl.130781] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kuramochi K, Tsubaki K, Kuriyama I, Mizushina Y, Yoshida H, Takeuchi T, Kamisuki S, Sugawara F, Kobayashi S. Synthesis, structure, and cytotoxicity studies of some fungal isochromanes. JOURNAL OF NATURAL PRODUCTS 2013; 76:1737-1745. [PMID: 24033077 DOI: 10.1021/np400460m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ustusorane D and penicisochromans B-D are natural isochromans isolated from Aspergillus ustus 094102 and Penicillium sp. PSU-F40, respectively. Herein, we report the syntheses of (-)-ustusorane D and (+)-penicisochroman B and the structures of penicisochromans C and D. The relative configuration of natural ustusorane D and the absolute configuration of natural penicisochroman B were determined. Two plausible structures for penicisochroman C were evaluated through synthesis, but their ¹H and ¹³C NMR data were not in agreement with those of the natural product. The structural revision and the determination of the absolute configuration of natural penicisochroman D were achieved. Structure-activity relationship studies of the synthetic compounds as well as a series of related isochromans indicated that the enone of the furanone moiety was essential for the cytotoxicity of these compounds toward HCT116 human colon cancer cells. Pseudodeflectusin, the related natural isochroman, suppressed cell growth and induced apoptosis in HCT116 cells.
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Tanioka A, Tanabe K, Hosono A, Kawakami H, Kaminogawa S, Tsubaki K, Hachimura S. Enhancement of intestinal immune function in mice by β-D-glucan from aureobasidium pullulans ADK-34. Scand J Immunol 2013; 78:61-8. [PMID: 23672535 DOI: 10.1111/sji.12067] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 04/22/2013] [Indexed: 11/27/2022]
Abstract
β-Glucans, glucose polymers that are the main constituents of the outer cell walls of micro-organisms such as fungi and yeast, are known to play an immunostimulatory role. We prepared β-glucan (β-(1-3),(1-6)-D-glucan) from an edible cultured fungus through fermentation techniques using a strain of Aureobasidium pullulans ADK-34. The purity of this β-glucan preparation (AP-FBG) was demonstrated to be high through various instrumental analyses. We then examined the effects of AP-FBG on intestinal immune systems. We prepared Peyer's patch (PP) cells and measured interleukin (IL)-5, IL-6, and IgA production in culture media with AP-FBG. We found that both cytokines and IgA increased; furthermore, IL-6 secreted by PP dendritic cells (PPDCs) cultured in the presence of AP-FBG significantly increased. We tested IgA production after oral administration of AP-FBG for 2 weeks and found that AP-FBG tended to promote the production of IgA in the small intestine. Interestingly, we observed a significant increase in IgA production in the small intestines of mice treated with cyclophosphamide (CY; an immunosuppressant) after oral administration of AP-FBG diet compared with CY-treated and control diet mice. Production of IL-6 and IgA by PP cells and IL-6 production by PPDCs in AP-FBG-fed and CY-treated mice also increased. These results demonstrate that AP-FBG has the ability to activate PPDC and induce IL-6 production and IgA secretion in PP cells. These abilities were more clearly expressed when AP-FBG was orally administered in a CY-induced immunosuppressed condition. Therefore, AP-FBG may be a useful ingredient for preparing functional foods with immunomodulatory activities.
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