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Shibuya M. Catalytic Intramolecular Hydrofunctionalization of Unactivated Alkenes and Alkynes. J SYN ORG CHEM JPN 2022. [DOI: 10.5059/yukigoseikyokaishi.80.645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Ohtsuka H, Matsumoto T, Mochida T, Shimasaki T, Shibuya M, Yamamoto Y, Aiba H. Tschimganine has different targets for chronological lifespan extension and growth inhibition in fission yeast. Biosci Biotechnol Biochem 2022; 86:775-779. [PMID: 35416247 DOI: 10.1093/bbb/zbac051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 03/25/2022] [Indexed: 11/14/2022]
Abstract
Tschimganine inhibits growth and extends the chronological lifespan in Schizosaccharomyces pombe. We synthesized a Tschimganine analog, Mochimganine, which extends the lifespan similar to Tschimganine but exhibits a significantly weaker growth inhibition effect. Based on the comparative analysis of these compounds, we propose that Tschimganine has at least 2 targets: one extends the lifespan and the other inhibits growth.
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Affiliation(s)
- Hokuto Ohtsuka
- Laboratory of Molecular Microbiology, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - Takuma Matsumoto
- Laboratory of Molecular Microbiology, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - Takahiro Mochida
- Laboratory of Molecular Microbiology, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - Takafumi Shimasaki
- Laboratory of Molecular Microbiology, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Aichi, Japan
| | - Masatoshi Shibuya
- Laboratory of Molecular Design, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Japan
| | - Yoshihiko Yamamoto
- Laboratory of Molecular Design, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Japan
| | - Hirofumi Aiba
- Laboratory of Molecular Microbiology, Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya, Aichi, Japan
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3
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Shibuya M, Orihashi T, Li Y, Yamamoto Y. N-Hydroxyphthalimide-catalyzed chemoselective intermolecular benzylic C-H amination of unprotected arylalkanols. Chem Commun (Camb) 2021; 57:8742-8745. [PMID: 34374398 DOI: 10.1039/d1cc03466a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
N-Hydroxyphthalimide-catalyzed chemoselective benzylic C(sp3)-H amination of unprotected arylalkanols using bis(2,2,2-trichloroethyl)azodicarboxylate has been developed. The use of 1,1,1,3,3,3-hexafluoropropan-2-ol as a solvent plays a critical role in chemoselectivity. The conversion of an aminated product to the corresponding free amino alcohol was also demonstrated.
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Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan.
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Shibuya M, Matsuda M, Yamamoto Y. 1,2-Carbopentafluorophenylation of Alkynes: The Metallomimetic Pull-Push Reactivity of Tris(pentafluorophenyl)borane. Chemistry 2021; 27:8822-8831. [PMID: 33860597 DOI: 10.1002/chem.202101090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Indexed: 12/26/2022]
Abstract
We report the novel single-step 1,2-dicarbofunctionalization of an arylacetylene with an allylsilane and tris(pentafluorophenyl)borane [B(C6 F5 )3 ] involving C-C bond formation with C-H bond scission at the β-position to the silicon atom of an allylsilane and B→C migration of a C6 F5 group. The 1,2-carbopentafluorophenylation occurs smoothly without the requirement for a catalyst or heating. Mechanistic studies suggest that the metallomimetic "pull-push" reactivity of B(C6 F5 )3 imparts consecutive electrophilic and nucleophilic characteristics to the benzylic carbon of the arylacetylene. Subsequent photochemical 6π-electrocyclization affords tetrafluoronaphthalenes, which are important in the pharmaceutical and materials sciences. Owing to the unique reactivity of B(C6 F5 )3 , the 1,2-carbopentafluorophenylation using 2-substituted furan proceeded with ring opening, and the reaction using silyl enolates formed a C-C bond with C-O bond scission at the silyloxy-substituted carbon.
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Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
| | - Miki Matsuda
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
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Jalaeian H, Acharya V, Shibuya M, Okuna Y, Bhatia S. Abstract No. 15 Two-year outcomes of comparing Embosphere microspheres versus imipenem–cilastatin for genicular artery embolization in patients with knee osteoarthritis. J Vasc Interv Radiol 2021. [DOI: 10.1016/j.jvir.2021.03.428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Inada H, Shibuya M, Yamamoto Y. Synthesis of Unprotected 2-Arylglycines by Transamination of Arylglyoxylic Acids with 2-(2-Chlorophenyl)glycine. J Org Chem 2020; 85:11047-11059. [PMID: 32790313 DOI: 10.1021/acs.joc.0c01302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The transamination of α-keto acids with 2-phenylglycine is an effective methodology for directly synthesizing unprotected α-amino acids. However, the synthesis of 2-arylglycines by transamination is problematic because the corresponding products, 2-arylglycines, transaminate the starting arylglyoxylic acids. Herein, we demonstrate the use of commercially available l-2-(2-chlorophenyl)glycine as the nitrogen source in the transamination of arylglyoxylic acids, producing the corresponding 2-arylglycines without interference from the undesired self-transamination process.
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Affiliation(s)
- Haruki Inada
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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Inada H, Furukawa K, Shibuya M, Yamamoto Y. One-pot, two-step synthesis of unnatural α-amino acids involving the exhaustive aerobic oxidation of 1,2-diols. Chem Commun (Camb) 2019; 55:15105-15108. [PMID: 31782427 DOI: 10.1039/c9cc07889d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Herein, we report the nor-AZADO-catalyzed exhaustive aerobic oxidations of 1,2-diols to α-keto acids. Combining oxidation with transamination using dl-2-phenylglycine led to the synthesis of free α-amino acids (AAs) in one pot. This method enables the rapid and flexible preparation of a variety of valuable unnatural AAs, such as fluorescent AAs, photoactivatable AAs, and other functional AAs for bioorthogonal reactions.
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Affiliation(s)
- Haruki Inada
- Department of Basic Medicinal Sciences Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan.
| | - Keisuke Furukawa
- Department of Basic Medicinal Sciences Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan.
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan.
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan.
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Kawamura T, Moriya H, Shibuya M, Yamamoto Y. Diastereoselective Methylation at the Congested β-Position of a Butenolide Ring: Studies toward the Synthesis of seco-Prezizaane-Type Sesquiterpenes. J Org Chem 2019; 84:12508-12519. [PMID: 31539248 DOI: 10.1021/acs.joc.9b02017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We established a method for installing a methyl group at the β-position of a butenolide ring. The methylated position is located at the congested ring juncture of a 5,6,5-tricyclic lactone, which is common to neurotrophic seco-prezizaane-type sesquiterpenes. The samarium(II)-mediated conjugate addition of the halomethylsilyl ethers tethered to the proximal hydroxy groups efficiently formed the desired C-C bond. Subsequent fluoride-free Tamao oxidation and Barton-McCombie deoxygenation converted the resultant cyclic silyl ether into the corresponding methyl group.
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Affiliation(s)
- Tomoyoshi Kawamura
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
| | - Hirokazu Moriya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
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Shibuya M, Kawano S, Fujita S, Yamamoto Y. Boron‐Catalyzed Hydroamination/Hydroallylation and Hydroamination/Hydrocyanation of Unactivated Alkynes. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900165] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal SciencesGraduate School of Pharmaceutical SciencesNagoya University Furo-cho, Chikusa Nagoya 464-8601 Japan
| | - Shohei Kawano
- Department of Basic Medicinal SciencesGraduate School of Pharmaceutical SciencesNagoya University Furo-cho, Chikusa Nagoya 464-8601 Japan
| | - Shoji Fujita
- Department of Basic Medicinal SciencesGraduate School of Pharmaceutical SciencesNagoya University Furo-cho, Chikusa Nagoya 464-8601 Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal SciencesGraduate School of Pharmaceutical SciencesNagoya University Furo-cho, Chikusa Nagoya 464-8601 Japan
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Abstract
A practical telescoping three-step process for the syntheses of α-amino acids from the corresponding 1,2-diols has been developed. This process enables the direct synthesis of free α-amino acids without any protection/deprotection step. This method was also effective for the preparation of a 15N-labeled α-amino acid. 1,2-Diols bearing α,β-unsaturated ester moieties afforded bicyclic α-amino acids through intramolecular [3 + 2] cycloadditions. A preliminary study suggests that the resultant α-amino acids are resolvable by aminoacylases with almost complete selectivity.
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Affiliation(s)
- Haruki Inada
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences , Nagoya University , Furo-cho, Chikusa, Nagoya 464-8601 , Japan
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Yamamoto Y, Ishida Y, Kurohara T, Shibuya M, Yasui T. Synthesis of γ-Difluoromethylated Tetronate Derivatives from Squarates Using Difluoromethylphosphonate. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)29] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hibi T, Ohtsuka H, Shimasaki T, Inui S, Shibuya M, Tatsukawa H, Kanie K, Yamamoto Y, Aiba H. Tschimganine and its derivatives extend the chronological life span of yeast via activation of the Sty1 pathway. Genes Cells 2018; 23:620-637. [PMID: 29900664 DOI: 10.1111/gtc.12604] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Revised: 05/01/2018] [Accepted: 05/15/2018] [Indexed: 12/13/2022]
Abstract
Most antiaging factors or life span extenders are associated with calorie restriction (CR). Very few of these factors function independently of, or additively with, CR. In this study, we focused on tschimganine, a compound that was reported to extend chronological life span (CLS). Although tschimganine led to the extension of CLS, it also inhibited yeast cell growth. We acquired a Schizosaccharomyces pombe mutant with a tolerance for tschimganine due to the gene crm1. The resulting Crm1 protein appears to export the stress-activated protein kinase Sty1 from the nucleus to the cytosol even under stressful conditions. Furthermore, we synthesized two derivative compounds of tschimganine, α-hibitakanine and β-hibitakanine; these derivatives did not inhibit cell growth, as seen with tschimganine. α-hibitakanine extended the CLS, not only in S. pombe but also in Saccharomyces cerevisiae, indicating the possibility that life span regulation by tschimganine derivative may be conserved across various yeast species. We found that the longevity induced by tschimganine was dependent on the Sty1 pathway. Based on our results, we propose that tschimganine and its derivatives extend CLS by activating the Sty1 pathway in fission yeast, and CR extends CLS via two distinct pathways, one Sty1-dependent and the other Sty1-independent. These findings provide the potential for creating an additive life span extension effect when combined with CR, as well as a better understanding of the mechanism of CLS.
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Affiliation(s)
- Takahide Hibi
- Laboratory of Molecular Microbiology, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Hokuto Ohtsuka
- Laboratory of Molecular Microbiology, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Takafumi Shimasaki
- Laboratory of Molecular Microbiology, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Shougo Inui
- Laboratory of Molecular Design, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Masatoshi Shibuya
- Laboratory of Molecular Design, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Hideki Tatsukawa
- Laboratory of Cellular Biochemistry, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Kei Kanie
- Laboratory of Cell and Molecular Bioengineering, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Yoshihiko Yamamoto
- Laboratory of Molecular Design, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Hirofumi Aiba
- Laboratory of Molecular Microbiology, Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa-ku, Nagoya, Japan
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Shibuya M, Hojo T, Hase Y, Fujisawa T. Conscious sedation with midazolam intravenously for a patient with Parkinson's disease and unpredictable chorea-like dyskinesia. Br J Oral Maxillofac Surg 2018; 56:546-548. [PMID: 29908706 DOI: 10.1016/j.bjoms.2018.05.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 05/25/2018] [Indexed: 11/17/2022]
Abstract
Oral surgery can be difficult in patients with chorea-like dyskinesia, which is common in those on long-term levodopa medication for Parkinson's disease, and we know of no conclusive evidence to indicate whether conscious sedation with midazolam is effective in such cases. We report a patient in whom levodopa-induced chorea-like dyskinesia disappeared when midazolam was given intravenously for conscious sedation.
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Affiliation(s)
- M Shibuya
- Department of Dental Anesthesiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University.
| | - T Hojo
- Department of Dental Anesthesiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University.
| | - Y Hase
- Department of Dental Anesthesiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University.
| | - T Fujisawa
- Department of Dental Anesthesiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University.
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Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masaki Okamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Shoji Fujita
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masanori Abe
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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Yamamoto Y, Kurohara T, Jiyue J, Shibuya M. Synthesis of Alkoxycarbonyldifluoromethyl-Substituted Semisquarates and Their Transformations. SYNTHESIS-STUTTGART 2018. [DOI: 10.1055/s-0036-1591887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A novel EtO2CCF2-substituted semisquarate is synthesized from diisopropyl squarate by selective 1,2-addition of the Reformatsky reagent derived from BrCF2CO2Et and subsequent rhenium-catalyzed allylic alcohol rearrangement. The compatibility of the highly reactive EtO2CCF2 group in ring transformations of the obtained semisquarate is investigated. Various EtO2CCF2-substituted, highly functionalized compounds, such as quinones, tetronates, cyclopentenones and a bicyclo-[3.2.0]heptenone, are successfully synthesized by ring transformations of the EtO2CCF2-substituted semisquarate. Also, an allylO2CCF2-substituted semisquarate is prepared and converted into the corresponding tetronate. Subsequent palladium-catalyzed deallylation followed by condensation of the resulting carboxylic acid with several amines under mild conditions affords the corresponding α,α-difluoroamides in good yields.
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Iwabuchi Y, Kuga T, Sasano Y, Tomizawa M, Shibuya M. Expedient Entry to 1-Aminoadamantane Derivatives via Aza-Prins Cyclization of 7-Methylenebicyclo[3.3.1]nonan-3-one Oximes. SYNTHESIS-STUTTGART 2018. [DOI: 10.1055/s-0036-1591920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
An efficient synthesis of 1-aminoadamantane (amantadine) derivatives is described. This synthesis features acid-promoted aza-Prins cyclization of 7-methylenebicyclo[3.3.1]nonan-3-one oximes, which are readily prepared from 1,3-adamantanediol via a Grob fragmentation and the subsequent oximation, to give various 3-substituted 1-(alkoxyamino)adamantanes. After the reduction of alkoxyamines, not only 3-substituted 1-aminoadamantanes, but also chiral 2,5-disubstituted derivatives were obtained in good yields.
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Yamamoto Y, Murayama T, Jiang J, Yasui T, Shibuya M. The vinylogous Catellani reaction: a combined computational and experimental study. Chem Sci 2017; 9:1191-1199. [PMID: 29675164 PMCID: PMC5885779 DOI: 10.1039/c7sc04265e] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 11/29/2017] [Indexed: 01/12/2023] Open
Abstract
In the presence of 5 mol% Pd(OAc)2, 1 equiv. of norbornene, and K2CO3, the reaction of 4-iodo-2-quinolones with tertiary o-bromobenzylic alcohols produced the desired benzopyran-fused 2-quinolones in moderate to high yields.
In the presence of 5 mol% Pd(OAc)2, 1 equiv. of norbornene, and K2CO3, the reaction of 4-iodo-2-quinolones with tertiary o-bromobenzylic alcohols produced the desired benzopyran-fused 2-quinolones in moderate to high yields. A Catellani-type mechanism involving vinylic C–H cleavage is proposed based on the results of control experiments and density functional theory calculations.
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Affiliation(s)
- Y Yamamoto
- Department of Basic Medicinal Sciences , Graduate School of Pharmaceutical Sciences , Nagoya University , Chikusa , Nagoya 464-8601 , Japan .
| | - T Murayama
- Department of Basic Medicinal Sciences , Graduate School of Pharmaceutical Sciences , Nagoya University , Chikusa , Nagoya 464-8601 , Japan .
| | - J Jiang
- Department of Basic Medicinal Sciences , Graduate School of Pharmaceutical Sciences , Nagoya University , Chikusa , Nagoya 464-8601 , Japan .
| | - T Yasui
- Department of Basic Medicinal Sciences , Graduate School of Pharmaceutical Sciences , Nagoya University , Chikusa , Nagoya 464-8601 , Japan .
| | - M Shibuya
- Department of Basic Medicinal Sciences , Graduate School of Pharmaceutical Sciences , Nagoya University , Chikusa , Nagoya 464-8601 , Japan .
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Geng S, Tsumori K, Nakano H, Kisaki M, Ikeda K, Osakabe M, Nagaoka K, Takeiri Y, Shibuya M. Response of H− ions to extraction field in a negative hydrogen ion source. Fusion Engineering and Design 2017. [DOI: 10.1016/j.fusengdes.2017.02.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Yamamoto Y, Okude Y, Mori S, Shibuya M. Combined Experimental and Computational Study on Ruthenium(II)-Catalyzed Reactions of Diynes with Aldehydes and N,N-Dimethylformamide. J Org Chem 2017; 82:7964-7973. [PMID: 28682074 DOI: 10.1021/acs.joc.7b01229] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cycloaddition reactions of 1,6-diynes bearing methyl terminal groups with p-anisaldehyde were conducted using a cationic ruthenium catalyst with a η5-pentamethylcyclopentadienyl ligand in THF at room temperature to afford dienyl ketones via ring opening of the initially formed fused pyrans. (Z)-Stereoisomers of dienyl ketones were selectively obtained using the ruthenium catalyst, whereas previously reported rhodium catalysts produced (E)-isomers. These (E)- and (Z)-selectivities are kinetically controlled as the control experiments showed that the E/Z-isomerization of (E)-dienylketone occurs at 70 °C for 10 h to afford an E/Z-ratio of almost 1:1. The origin of this characteristic stereoselectivity for the ruthenium catalyst was attributed to the direct ring opening of the CpRu+-coordinated pyran complex intermediates on the basis of theoretical calculations [PCM (THF) M06L/SDD-6-311++G(d,p)//B3LYP/LanL2DZ-6-31G(d)] and control experiments. The (Z)-selectivity increased when the bulkiness of the diyne terminal substituents increased. Notably, the reaction of 1,6-diynes bearing tert-butyl terminal groups with various α,β-unsaturated aldehydes exclusively afforded (Z)-dienyl ketones even at 70 °C when a cationic ruthenium complex with a smaller η5-cyclopentadienyl (Cp) ligand was used as the catalyst. The same Cp complex was found to be also efficient for the hydrocarbamoylative cyclization of sterically demanding 1,6-diynes bearing tertiary or quaternary carbon tethers with N,N-dimethylformamide.
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Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
| | - Yuta Okude
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
| | - Shota Mori
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
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20
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Shibuya M, Fujita S, Yamamoto Y. Intramolecular Hydroalkoxylation/Reduction and Hydroamination/Reduction of Unactivated Alkynes Using a Silane–Iodine Catalytic System. SYNTHESIS-STUTTGART 2017. [DOI: 10.1055/s-0036-1588436] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
A transition-metal-free silane–iodine catalytic system comprising I2 and Et3SiH promotes intramolecular hydroalkoxylation/reduction and hydroamination/reduction of unactivated alkynes. This system allows the reaction to proceed at room temperature affording 2,4- and 2,5-disubstituted pyrrolidines as well as a 2,3-disubstituted tetrahydrofuran with high diastereoselectivity.
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21
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Yamamoto Y, Nishimura KI, Mori S, Shibuya M. Assembly of a Benzo-Fused Bridged Ketone Scaffold from 1,5,10-Enediynes through One-Pot Ruthenium-Catalyzed Cyclization/Iodine-Mediated Oxidative Ring Expansion. Angew Chem Int Ed Engl 2017; 56:5494-5497. [PMID: 28418229 DOI: 10.1002/anie.201700493] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Indexed: 01/11/2023]
Abstract
In the presence of a cationic Ru catalyst, 1,6-diynes bearing a terminal styryl moiety underwent [2+2+2] cyclization to produce dehydrobiphenylenes fused with a five-membered ring. Although the cycloadducts were unstable toward purification, their one-pot iodine-mediated ring expansion successfully afforded unprecedented bridged ketone products containing a benzo-fused bicyclo[3.2.1] framework.
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Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
| | - Kei-Ichiro Nishimura
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
| | - Shota Mori
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
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22
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Yamamoto Y, Nishimura KI, Mori S, Shibuya M. Assembly of a Benzo-Fused Bridged Ketone Scaffold from 1,5,10-Enediynes through One-Pot Ruthenium-Catalyzed Cyclization/Iodine-Mediated Oxidative Ring Expansion. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Kei-ichiro Nishimura
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Shota Mori
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
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23
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Shibuya M, Fujita S, Abe M, Yamamoto Y. Correction to “Brønsted Acid/Silane Catalytic System for Intramolecular Hydroalkoxylation and Hydroamination of Unactivated Alkynes”. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Shoji Fujita
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masanori Abe
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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24
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Takeiri Y, Kaneko O, Tsumori K, Osakabe M, Ikeda K, Nagaoka K, Nakano H, Asano E, Kondo T, Sato M, Shibuya M, Komada S. High Performance of Neutral Beam Injectors for Extension of LHD Operational Regime. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10834] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Takeiri
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Nakano
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - E. Asano
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Kondo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Sato
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Shibuya
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Komada
- National Institute for Fusion Science, Toki 509-5292, Japan
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25
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Tsumori K, Takeiri Y, Kaneko O, Osakabe M, Ando A, Ikeda K, Nagaoka K, Nakano H, Asano E, Shibuya M, Sato M, Kondo T, Komada M. Research and Development Activities on Negative Ion Sources. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10835] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- K. Tsumori
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - A. Ando
- Tohoku University, Department of Electrical Engineering, 6-6-05 Aoba-yama, Aoba, Sendai 980-8579, Japan
| | - K. Ikeda
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - H. Nakano
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - E. Asano
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - M. Shibuya
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - M. Sato
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - T. Kondo
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
| | - M. Komada
- National Institute for Fusion Science, 322-6 Orosh-cho, Toki-city, Gifu 509-5292, Japan
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26
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Shibuya M, Fujita S, Abe M, Yamamoto Y. Brønsted Acid/Silane Catalytic System for Intramolecular Hydroalkoxylation and Hydroamination of Unactivated Alkynes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00403] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Shoji Fujita
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masanori Abe
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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27
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Abstract
The 2-azaadamantane-N-oxyl (AZADO)- and 9-azanoradamantane-N-oxyl (nor-AZADO)-catalyzed selective oxidation of primary alcohols to the corresponding aldehydes is described. The use of tert-butyl nitrite as the co-catalyst enables efficient aerobic oxidation in MeCN instead of previously reported AcOH; this is important for the selectivity of the reaction. The addition of a solution of saturated aqueous NaHCO3 after the completion of the reaction was effective to suppress the overoxidation of the product to the corresponding carboxylic acid during the workup.
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28
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Yamamoto Y, Ohkubo E, Shibuya M. Synthesis of 3-Aryl-2-(trifluoromethyl)indoles via Copper-Catalyzed Hydroarylation and Subsequent Cadogan Cyclization. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700122] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yoshishiko Yamamoto
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Erina Ohkubo
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
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29
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Kurohara T, Shibuya M, Yamamoto Y. Electrophilic Derivatization of Trifluoromethyl-Substituted Semisquarate Using Unsaturated Organosilanes and Subsequent Ring Transformations. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601297] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Takashi Kurohara
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences; Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
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30
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31
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Yamamoto Y, Nishimura KI, Shibuya M. Ruthenium-Catalyzed Cycloisomerization of 1,6-Diynes with Styryl Terminals Leading to Indenylidene Cycloalkanes. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03322] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Kei-ichiro Nishimura
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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32
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33
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Abstract
Polymethoxylated 4-aryl-2-quinolones were synthesized from the corresponding (o-aminophenyl)propiolates via Cu-catalyzed hydroarylation and subsequent deprotection/lactam formation. Selective iodination of the C3 position of the product followed by coupling reactions of the resulting 3-iodinated 4-aryl-2-quinolone afforded 3-substituted-4-aryl-2-quinolones. Moreover, the N-benzyl protecting group was successfully replaced with other polyoxygenated benzyl groups.
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Affiliation(s)
- Tsukasa Murayama
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University , Chikusa, Nagoya 464-8601, Japan
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34
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Matsui K, Shibuya M, Yamamoto Y. Catalytic [2+2+1] Synthesis of Fused Thiophenes Using Thiocarbonyls as Sulfur Donors. Angew Chem Int Ed Engl 2016; 55:15397-15400. [DOI: 10.1002/anie.201609545] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Kazuma Matsui
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
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35
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Affiliation(s)
- Kazuma Matsui
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences; Nagoya University; Chikusa Nagoya 464-8601 Japan
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36
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Suzuki M, Shibuya M, Shimada H, Motoyama N, Nakashima M, Takahashi S, Suto K, Yoshida I, Matsui S, Tsujimoto N, Ohnishi M, Ishibashi Y, Fujimoto Z, Desaki Y, Kaku H, Kito K, Shibuya N. Autophosphorylation of Specific Threonine and Tyrosine Residues in Arabidopsis CERK1 is Essential for the Activation of Chitin-Induced Immune Signaling. Plant Cell Physiol 2016; 57:2312-2322. [PMID: 27565204 DOI: 10.1093/pcp/pcw150] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 08/17/2016] [Indexed: 05/06/2023]
Abstract
Pattern recognition receptors on the plant cell surface mediate the recognition of microbe/damage-associated molecular patterns (MAMPs/DAMPs) and activate downstream immune signaling. Autophosphorylation of signaling receptor-like kinases is a critical event for the activation of downstream responses but the function of each phosphorylation site in the regulation of immune signaling is not well understood. In this study, 41 Ser/Thr/Tyr and 15 Ser/Thr residues were identified as in vitro and in vivo autophosphorylation sites of Arabidopsis CERK1, which is essential for chitin signaling. Comprehensive analysis of transgenic plants expressing mutated CERK1 genes for each phosphorylation site in the cerk1-2 background indicated that the phosphorylation of T479 in the activation segment and Y428 located upstream of the catalytic loop is important for the activation of chitin-triggered defense responses. Contribution of the phosphorylation of T573 to the chitin responses was also suggested. In vitro evaluation of kinase activities of mutated kinase domains indicated that the phosphorylation of T479 and T573 is directly involved in the regulation of kinase activity of CERK1 but the phosphorylation of Y428 regulates chitin signaling independently of the regulation of kinase activity. These results indicated that the phosphorylation of specific residues in the kinase domain contributes to the regulation of downstream signaling either through the regulation of kinase activity or the different mechanisms, e.g. regulation of protein-protein interactions.
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Affiliation(s)
- Maruya Suzuki
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
- These authors contributed equally to this work
| | - Masatoshi Shibuya
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
- These authors contributed equally to this work
| | - Hikaru Shimada
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
- These authors contributed equally to this work
| | - Noriko Motoyama
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
- These authors contributed equally to this work
| | - Masato Nakashima
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Shohei Takahashi
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Kenkichi Suto
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Issei Yoshida
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Saki Matsui
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Natsumi Tsujimoto
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Mihoko Ohnishi
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Yuko Ishibashi
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Zui Fujimoto
- National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki, 305-8602, Japan
| | - Yoshitake Desaki
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Hanae Kaku
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Keiji Kito
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
| | - Naoto Shibuya
- Department of Life Sciences, School of Agriculture, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, 214-8571, Japan
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37
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Furukawa K, Inada H, Shibuya M, Yamamoto Y. Chemoselective Conversion from α-Hydroxy Acids to α-Keto Acids Enabled by Nitroxyl-Radical-Catalyzed Aerobic Oxidation. Org Lett 2016; 18:4230-3. [DOI: 10.1021/acs.orglett.6b01964] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keisuke Furukawa
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Haruki Inada
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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38
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Geng S, Tsumori K, Nakano H, Kisaki M, Ikeda K, Osakabe M, Nagaoka K, Takeiri Y, Shibuya M, Kaneko O. Charged particle flows in the beam extraction region of a negative ion source for NBI. Rev Sci Instrum 2016; 87:02B103. [PMID: 26931985 DOI: 10.1063/1.4931796] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Experiments by a four-pin probe and photodetachment technique were carried out to investigate the charged particle flows in the beam extraction region of a negative hydrogen ion source for neutral beam injector. Electron and positive ion flows were obtained from the polar distribution of the probe saturation current. Negative hydrogen ion flow velocity and temperature were obtained by comparing the recovery times of the photodetachment signals at opposite probe tips. Electron and positive ions flows are dominated by crossed field drift and ambipolar diffusion. Negative hydrogen ion temperature is evaluated to be 0.12 eV.
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Affiliation(s)
- S Geng
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - K Tsumori
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - H Nakano
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - M Kisaki
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - K Ikeda
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - M Osakabe
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - K Nagaoka
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - Y Takeiri
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - M Shibuya
- National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
| | - O Kaneko
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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39
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Murayama T, Shibuya M, Yamamoto Y. Cover Picture: Synthesis of 4‐Aryl‐2‐Quinolones
via
Copper‐Catalyzed Hydroarylation of (
o
‐Aminophenyl)propiolates with Arylboronates (Adv. Synth. Catal. 2/2016). Adv Synth Catal 2016. [DOI: 10.1002/adsc.201501022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tsukasa Murayama
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464‐8601, Japan, Fax: (+81)‐52‐747‐6800
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464‐8601, Japan, Fax: (+81)‐52‐747‐6800
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464‐8601, Japan, Fax: (+81)‐52‐747‐6800
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40
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Abstract
PhSiH3–I2 and PhSiH3–NIS generate PhSiH2I as a possible active species and cause diverse transformations.
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Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal Sciences
- Graduate School of Pharmaceutical Sciences
- Nagoya University
- Nagoya 464-8601
- Japan
| | - Masanori Abe
- Department of Basic Medicinal Sciences
- Graduate School of Pharmaceutical Sciences
- Nagoya University
- Nagoya 464-8601
- Japan
| | - Shoji Fujita
- Department of Basic Medicinal Sciences
- Graduate School of Pharmaceutical Sciences
- Nagoya University
- Nagoya 464-8601
- Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences
- Graduate School of Pharmaceutical Sciences
- Nagoya University
- Nagoya 464-8601
- Japan
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41
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Shibuya M. Development of Efficient Nitroxyl Radical-Catalyzed Oxidation Systems —Selective Oxidation from Primary Alcohols to Carboxylic Acids—. J SYN ORG CHEM JPN 2016. [DOI: 10.5059/yukigoseikyokaishi.74.965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University
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42
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Murayama T, Shibuya M, Yamamoto Y. Synthesis of 4‐Aryl‐2‐Quinolones
via
Copper‐Catalyzed Hydroarylation of (
o
‐Aminophenyl)propiolates with Arylboronates. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500837] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tsukasa Murayama
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464‐8601, Japan, Fax: (+81)‐52‐747‐6800
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464‐8601, Japan, Fax: (+81)‐52‐747‐6800
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464‐8601, Japan, Fax: (+81)‐52‐747‐6800
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43
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Uesugi SI, Watanabe T, Imaizumi T, Ota Y, Yoshida K, Ebisu H, Chinen T, Nagumo Y, Shibuya M, Kanoh N, Usui T, Iwabuchi Y. Total Synthesis and Biological Evaluation of Irciniastatin A (a.k.a. Psymberin) and Irciniastatin B. J Org Chem 2015; 80:12333-50. [PMID: 26544018 DOI: 10.1021/acs.joc.5b02256] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Irciniastatin A (a.k.a. psymberin) and irciniastatin B are members of the pederin natural product family, which have potent antitumor activity and structural complexity. Herein, we describe a full account of our total synthesis of (+)-irciniastatin A and (-)-irciniastatin B. Our synthesis features the highly regioselective Eu(OTf)3-catalyzed, DTBMP-assisted epoxide ring opening reaction with MeOH, which enabled a concise synthesis of the C1-C6 fragment, extensive use of AZADO (2-azaadamantane N-oxyl) and its related nitroxyl radical/oxoammonium salt-catalyzed alcohol oxidation throughout the synthesis, and a late-stage assembly of C1-C6, C8-C16, and C17-C25 fragments. In addition, for the synthesis of (-)-irciniastatin B, we achieved the C11-selective control of the oxidation stage via regioselective deprotection and AZADO-catalyzed alcohol oxidation. The synthetic irciniastatins showed high levels of cytotoxic activity against mammalian cells. Furthermore, chemical footprinting experiments using synthetic compounds revealed that the binding site of irciniastatins is the E-site of the ribosome.
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Affiliation(s)
- Shun-ichiro Uesugi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aobayama, Sendai 980-8578, Japan
| | - Tsubasa Watanabe
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aobayama, Sendai 980-8578, Japan
| | - Takamichi Imaizumi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aobayama, Sendai 980-8578, Japan
| | - Yu Ota
- Graduate School of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Keisuke Yoshida
- Graduate School of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Haruna Ebisu
- Graduate School of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Takumi Chinen
- Graduate School of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Yoko Nagumo
- Graduate School of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan.,Faculty of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Masatoshi Shibuya
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aobayama, Sendai 980-8578, Japan
| | - Naoki Kanoh
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aobayama, Sendai 980-8578, Japan
| | - Takeo Usui
- Graduate School of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan.,Faculty of Life and Environmental Sciences, University of Tsukuba , Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Yoshiharu Iwabuchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aobayama, Sendai 980-8578, Japan
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44
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Matsui K, Shibuya M, Yamamoto Y. Ruthenium-Catalyzed Transfer Oxygenative [2 + 2 + 1] Cycloaddition of Silyldiynes Using Nitrones as Adjustable Oxygen Atom Donors. Synthesis of Bicyclic 2-Silylfurans. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01855] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kazuma Matsui
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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45
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Osawa T, Shimamura T, Ayano K, Shibuya M, Kodama T. 113 Cancer cells utilize lipid metabolism under hypoxia and nutrient starvation. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30011-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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46
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Affiliation(s)
- Shoji Fujita
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masanori Abe
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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47
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Yamamoto Y, Mori S, Shibuya M. Inside Back Cover: A Combined Transition-Metal-Catalyzed and Photopromoted Process: Synthesis of 2,3-Fused 4-Phenylnaphthalen-1-yl Carboxylates from 1,7-Diaryl-1,6-diynes (Chem. Eur. J. 25/2015). Chemistry 2015. [DOI: 10.1002/chem.201590110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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Yamamoto Y, Mori S, Shibuya M. A Combined Transition-Metal-Catalyzed and Photopromoted Process: Synthesis of 2,3-Fused 4-Phenylnaphthalen-1-yl Carboxylates from 1,7-Diaryl-1,6-diynes. Chemistry 2015; 21:9093-100. [PMID: 25980465 DOI: 10.1002/chem.201500978] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Indexed: 12/19/2022]
Abstract
2,3-Fused 4-phenylnaphthalen-1-yl carboxylates were synthesized in a step- and atom-economical manner using a ruthenium-catalyzed hydrocarboxylative cyclization of 1,7-diaryl-1,6-diynes and subsequent oxidative photocyclization. The scope of this novel two-step process was demonstrated by the construction of diverse structures from substrates with various tethers and terminal aryl groups. Late-stage CH functionalizations of the arylnaphthalene product further enhance the synthetic potential of the developed process.
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Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601 (Japan).
| | - Shota Mori
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601 (Japan)
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601 (Japan)
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49
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Furukawa K, Shibuya M, Yamamoto Y. Chemoselective Catalytic Oxidation of 1,2-Diols to α-Hydroxy Acids Controlled by TEMPO-ClO2 Charge-Transfer Complex. Org Lett 2015; 17:2282-5. [PMID: 25886211 DOI: 10.1021/acs.orglett.5b01003] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chemoselective catalytic oxidation from 1,2-diols to α-hydroxy acids in a cat. TEMPO/cat. NaOCl/NaClO2 system has been achieved. The use of a two-phase condition consisting of hydrophobic toluene and water suppresses the concomitant oxidative cleavage. A study of the mechanism suggests that the observed selectivity is derived from the precise solubility control of diols and hydroxy acids as well as the active species of TEMPO. Although the oxoammonium species TEMPO(+)Cl(-) is hydrophilic, the active species dissolves into the organic layer by the formation of the charge-transfer (CT) complex TEMPO-ClO2 under the reaction conditions.
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Affiliation(s)
- Keisuke Furukawa
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
| | - Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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50
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Yamamoto Y, Matsui K, Shibuya M. A combined experimental and computational study on the cycloisomerization of 2-ethynylbiaryls catalyzed by dicationic arene ruthenium complexes. Chemistry 2015; 21:7245-55. [PMID: 25820833 DOI: 10.1002/chem.201500248] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Indexed: 12/11/2022]
Abstract
Ruthenium-catalyzed cycloisomerization of 2-ethynylbiaryls was investigated to identify an optimal ruthenium catalyst system. A combination of [η(6) -(p-cymene)RuCl2 (PR3 )] and two equivalents of AgPF6 effectively converted 2-ethynylbiphenyls into phenanthrenes in chlorobenzene at 120 °C over 20 h. Moreover, 2-ethynylheterobiaryls were found to be favorable substrates for this ruthenium catalysis, thus achieving the cycloisomerization of previously unused heterocyclic substrates. Moreover, several control experiments and DFT calculations of model complexes were performed to propose a plausible reaction mechanism.
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Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601 (Japan).
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