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Hakamata H, Ueda H, Tokuyama H. Construction of Indole Structure on Pyrroloindolines via AgNTf 2-Mediated Amination/Cyclization Cascade: Application to Total Synthesis of (+)-Pestalazine B. Org Lett 2019; 21:4205-4209. [PMID: 31117711 DOI: 10.1021/acs.orglett.9b01399] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An N-linked indole structure was constructed on the 3a-position of pyrroloindoline derivatives via a cascade process involving silver-mediated amination of bromopyrroloindolines with 2-ethynylanilines with subsequent 5- endo-dig cyclization. In this reaction, AgNTf2 was used as a tandem reagent, which activated the bromo group as a σ-Lewis acid and the alkyne moiety as a π-Lewis acid. Switching from the initial step to the second step was conducted by controlling the temperature. This protocol was applied to the synthesis of various pyrroloindolines, α-carboline, and furoindolines and the total synthesis of a dimeric indole alkaloid, (+)-pestalazine B.
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Mogi Y, Inanaga K, Tokuyama H, Ihara M, Yamaoka Y, Yamada KI, Takasu K. Rapid Assembly of Protoilludane Skeleton through Tandem Catalysis: Total Synthesis of Paesslerin A and Its Structural Revision. Org Lett 2019; 21:3954-3958. [PMID: 31117698 DOI: 10.1021/acs.orglett.9b01089] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A multicomponent domino reaction involving three mechanistically distinct Tf2NH-catalyzed reactions was developed. The reaction cascade enables the assembly of a skewed 5/6/4 tricyclic motif with migration of the reactive site with the assistance of a catalyst. The tricyclic product was used to achieve the first total synthesis of cytotoxic paesslerin A by regioselective C-H insertion of the sulfonyl carbenoid and base-promoted olefin isomerization. Our results led to the revision of the originally proposed tricyclic structure of paesslerin A.
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Kawauchi D, Ueda H, Tokuyama H. Double Functionalization of Styrenes by Cu-Mediated Assisted Tandem Catalysis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900088] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Sugisawa N, Ohnuma S, Ueda H, Murakami M, Sugiyama K, Ohsawa K, Kano K, Tokuyama H, Doi T, Aoki J, Ishida M, Kudoh K, Naitoh T, Ambudkar SV, Unno M. Novel Potent ABCB1 Modulator, Phenethylisoquinoline Alkaloid, Reverses Multidrug Resistance in Cancer Cell. Mol Pharm 2018; 15:4021-4030. [PMID: 30052463 DOI: 10.1021/acs.molpharmaceut.8b00457] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
ATP-binding cassette (ABC) transporters, which are concerned with the efflux of anticancer drugs from cancer cells, have a pivotal role in multidrug resistance (MDR). In particular, ABCB1 is a well-known ABC transporter that develops MDR in many cancer cells. Some ABCB1 modulators can reverse ABCB1-mediated MDR; however, no modulators with clinical efficacy have been approved. The aim of this study was to identify novel ABCB1 modulators by using high-throughput screening. Of the 5861 compounds stored at Tohoku University, 13 compounds were selected after the primary screening via a fluorescent plate reader-based calcein acetoxymethylester (AM) efflux assay. These 13 compounds were validated in a flow cytometry-based calcein AM efflux assay. Two isoquinoline derivatives were identified as novel ABCB1 inhibitors, one of which was a phenethylisoquinoline alkaloid, (±)-7-benzyloxy-1-(3-benzyloxy-4-methoxyphenethyl)-1,2,3,4-tetrahydro-6-methoxy-2-methylisoquinoline oxalate. The compound, a phenethylisoquinoline alkaloid, was subsequently evaluated in the cytotoxicity assay and shown to significantly enhance the reversal of ABCB1-mediated MDR. In addition, the compound activated the ABCB1-mediated ATP hydrolysis and inhibited the photolabeling of ABCB1 with [125I]-iodoarylazidoprazosin. Furthermore, the compound also reversed the resistance to paclitaxel without increasing the toxicity in the ABCB1-overexpressing KB-V1 cell xenograft model. Overall, we concluded that the newly identified phenethylisoquinoline alkaloid reversed ABCB1-mediated MDR through direct interaction with the substrate-binding site of ABCB1. These findings may contribute to the development of more potent and less toxic ABCB1 modulators, which could overcome ABCB1-mediated MDR.
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Tokuyama H, Itabashi S, Shimomura M, Sato M, Azuma H, Okano K, Sakata J. One-Pot Reductive Allylation of Amides by Using a Combination of Titanium Hydride and an Allylzinc Reagent: Application to a Total Synthesis of (–)-Castoramine. Synlett 2018. [DOI: 10.1055/s-0037-1610435] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
A one-pot direct reductive allylation protocol has been developed for the synthesis of secondary amines by using titanium hydride and an allylzinc reagent. This protocol is applicable to a broad range of substrates, including acyclic amides, benzamides, α,β-unsaturated amides, and lactams. The stereochemical outcome obtained from the reaction with crotylzinc reagent suggested that the allylation reaction proceeds through a six-membered cyclic transition state. A total synthesis of (–)-castoramine was accomplished by following this protocol for the highly stereoselective construction of contiguous stereocenters.
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Uchiyama S, Tsuji T, Kawamoto K, Okano K, Fukatsu E, Noro T, Ikado K, Yamada S, Shibata Y, Hayashi T, Inada N, Kato M, Koizumi H, Tokuyama H. A Cell‐Targeted Non‐Cytotoxic Fluorescent Nanogel Thermometer Created with an Imidazolium‐Containing Cationic Radical Initiator. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201801495] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Uchiyama S, Tsuji T, Kawamoto K, Okano K, Fukatsu E, Noro T, Ikado K, Yamada S, Shibata Y, Hayashi T, Inada N, Kato M, Koizumi H, Tokuyama H. A Cell‐Targeted Non‐Cytotoxic Fluorescent Nanogel Thermometer Created with an Imidazolium‐Containing Cationic Radical Initiator. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201801495] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Ojima KI, Yangchum A, Laksanacharoen P, Tasanathai K, Thanakitpipattana D, Tokuyama H, Isaka M. Cordybislactone, a stereoisomer of the 14-membered bislactone clonostachydiol, from the hopper pathogenic fungus Cordyceps sp. BCC 49294: revision of the absolute configuration of clonostachydiol. J Antibiot (Tokyo) 2018; 71:351-358. [DOI: 10.1038/s41429-017-0008-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 11/16/2017] [Accepted: 11/22/2017] [Indexed: 11/09/2022]
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Tokuyama H, Sugimoto K, Fujiwara H, Takada A, Kim DG, Ueda H. Synthetic Studies toward Isoschizogamine: Construction of Pentacyclic Core Structure. HETEROCYCLES 2018. [DOI: 10.3987/com-18-s(t)85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tokuyama H, Miyamoto N, Nakazawa Y, Nakamura T, Okano K, Sato S, Sun Z, Isobe H. Synthesis of 9,10-Diarylanthracenes via Mg(TMP)2·2LiCl-Mediated Benzyne Generation/[4+2] Cycloaddition and Deoxygenation of 9,10-Epoxyanthracene Intermediates. Synlett 2017. [DOI: 10.1055/s-0036-1591510] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A new synthetic route to functionalized 9,10-diarylanthracenes has been developed. 9,10-Epoxyanthracene intermediates were prepared by [4+2] cycloaddition of 1,3-diarylisobenzofuran with a variety of functionalized benzyne intermediates, which were obtained by Mg(TMP)2·2LiCl-mediated benzyne generation. For the cleavage of the resultant 9,10-epoxyanthracene intermediates, we developed mild deoxygenation conditions using a combination of trifluoroacetic acid and Et3SiH. The utility of this sequence was demonstrated by application to the synthesis of 5,7,12,14-tetraphenylpentacene.
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Hakamata H, Sato S, Ueda H, Tokuyama H. AgNTf2-Mediated Allylation with Allylsilanes at C3a-Position of Hexahydropyrroloindoles: Application to Total Syntheses of Amauromine Alkaloids. Org Lett 2017; 19:5308-5311. [DOI: 10.1021/acs.orglett.7b02602] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yoshii Y, Tokuyama H, Chen DYK. Total Synthesis of Actinophyllic Acid. Angew Chem Int Ed Engl 2017; 56:12277-12281. [DOI: 10.1002/anie.201706312] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Indexed: 11/07/2022]
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Tokuyama H, Sato S, Hirayama A, Adachi T, Kawauchi D, Ueda H. AgNTf2-Mediated Arylation of Bromopyrroloindolines. HETEROCYCLES 2017. [DOI: 10.3987/com-17-13777] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Sun Z, Miyamoto N, Sato S, Tokuyama H, Isobe H. An Obtuse-angled Corner Unit for Fluctuating Carbon Nanohoops. Chem Asian J 2016; 12:271-275. [PMID: 27897398 DOI: 10.1002/asia.201601614] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Indexed: 11/10/2022]
Abstract
The invention of corner units was the key factor that allowed the synthesis of cyclo-para-phenylenes with strained curved π-systems. Despite only a few scarce instances of the development of corner units to date, a variety of structural congeners have been synthesized. These preceding corner units commonly possessed directing angles of ≤90°, which enabled the macrocyclization of multiple units, up to six. In this study, we introduce an obtuse-angled corner unit for the synthesis of cyclo-para-phenylene congeners. The corner unit with oxanorbornadiene possessed a directing angle of 126° and thus allowed for the macrocyclization of larger structures with up to seven units. Reductive aromatization was applicable to complete the cyclo-para-phenylene structures and afforded the congeners with multiple anthracenylene panels. Structural studies with experimental and theoretical methods revealed a fluctuating structure with an intrinsic non-belt shape.
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Sato M, Azuma H, Daigaku A, Sato S, Takasu K, Okano K, Tokuyama H. Total Synthesis of (−)-Histrionicotoxin through a Stereoselective Radical Translocation-Cyclization Reaction. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609941] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tokuyama H, Yamada K, Fujiwara H, Sakata J, Okano K, Sappan M, Isaka M. Structural Determination of (−)-SCH 64874 and Hirsutellomycin by Semisynthesis. J Org Chem 2016; 82:353-371. [DOI: 10.1021/acs.joc.6b02452] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sato S, Hirayama A, Ueda H, Tokuyama H. Total Syntheses of (+)-T988 B and (+)-T988 C through the AgNTf2-Mediated Coupling of Bromopyrroloindoline with Indole. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600474] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Satoh H, Ojima KI, Ueda H, Tokuyama H. Bioinspired Total Synthesis of the Dimeric Indole Alkaloid (+)-Haplophytine by Direct Coupling and Late-Stage Oxidative Rearrangement. Angew Chem Int Ed Engl 2016; 55:15157-15161. [DOI: 10.1002/anie.201609285] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Indexed: 11/11/2022]
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Umehara A, Ueda H, Tokuyama H. Condensation of Carboxylic Acids with Non-Nucleophilic N-Heterocycles and Anilides Using Boc 2O. J Org Chem 2016; 81:11444-11453. [PMID: 27767302 DOI: 10.1021/acs.joc.6b02097] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel condensation reaction of carboxylic acids with various non-nucleophilic N-heterocycles and anilides was developed. The reaction proceeds in the presence of di-tert-butyl dicarbonate (Boc2O), catalytic 4-(dimethylamino)pyridine (DMAP), and 2,6-lutidine and is applicable to the acylation of a wide range of non-nucleophilic nitrogen compounds, including indoles, pyrroles, pyrazole, carbazole, lactams, oxazolidinones, and anilides with high functional group compatibility. The scope of indoles, carboxylic acids, and anilides was also studied.
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Morita J, Kano K, Kato K, Takita H, Sakagami H, Yamamoto Y, Mihara E, Ueda H, Sato T, Tokuyama H, Arai H, Asou H, Takagi J, Ishitani R, Nishimasu H, Nureki O, Aoki J. Structure and biological function of ENPP6, a choline-specific glycerophosphodiester-phosphodiesterase. Sci Rep 2016; 6:20995. [PMID: 26888014 PMCID: PMC4757880 DOI: 10.1038/srep20995] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 01/14/2016] [Indexed: 11/09/2022] Open
Abstract
Choline is an essential nutrient for all living cells and is produced extracellularly by sequential degradation of phosphatidylcholine (PC). However, little is known about how choline is produced extracellularly. Here, we report that ENPP6, a choline-specific phosphodiesterase, hydrolyzes glycerophosphocholine (GPC), a degradation product of PC, as a physiological substrate and participates in choline metabolism. ENPP6 is highly expressed in liver sinusoidal endothelial cells and developing oligodendrocytes, which actively incorporate choline and synthesize PC. ENPP6-deficient mice exhibited fatty liver and hypomyelination, well known choline-deficient phenotypes. The choline moiety of GPC was incorporated into PC in an ENPP6-dependent manner both in vivo and in vitro. The crystal structure of ENPP6 in complex with phosphocholine revealed that the choline moiety of the phosphocholine is recognized by a choline-binding pocket formed by conserved aromatic and acidic residues. The present study provides the molecular basis for ENPP6-mediated choline metabolism at atomic, cellular and tissue levels.
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Yamaguchi M, Itagaki D, Ueda H, Tokuyama H. Total syntheses of codonopsinine and 4-epi-codonopsinine via gold-mediated tandem-catalyzed pyrrole synthesis. J Antibiot (Tokyo) 2016; 69:253-8. [DOI: 10.1038/ja.2016.13] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 01/12/2016] [Accepted: 01/23/2016] [Indexed: 12/27/2022]
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Nonaka S, Sugimoto K, Ueda H, Tokuyama H. Cover Picture: Synthesis of Substituted Quinolizidines via
a Gold-Catalyzed Double Cyclization Cascade (Adv. Synth. Catal. 3/2016). Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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50
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Nonaka S, Sugimoto K, Ueda H, Tokuyama H. Synthesis of Substituted Quinolizidines via
a Gold-Catalyzed Double Cyclization Cascade. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500907] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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