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Komatsuda M, Ohki H, Kondo H, Suto A, Yamaguchi J. Ring-Opening Fluorination of Isoxazoles. Org Lett 2022; 24:3270-3274. [PMID: 35471036 DOI: 10.1021/acs.orglett.2c01149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A ring-opening fluorination of isoxazoles has been developed. Upon treatment of isoxazoles with an electrophilic fluorinating agent (Selectfluor), fluorination followed by deprotonation leads to tertiary fluorinated carbonyl compounds. This method features mild reaction conditions, good functional group tolerance, and a simple experimental procedure. Diverse transformations of the resulting α-fluorocyanoketones were also demonstrated, furnishing a variety of fluorinated compounds.
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Affiliation(s)
- Masaaki Komatsuda
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo 162-0041, Japan
| | - Hugo Ohki
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo 162-0041, Japan
| | - Hiroki Kondo
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo 162-0041, Japan
| | - Ayane Suto
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo 162-0041, Japan
| | - Junichiro Yamaguchi
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo 162-0041, Japan
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2
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Borodkin GI, Shubin VG. Electrophilic and Oxidative Fluorination of Heterocyclic Compounds: Contribution to Green Chemistry. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021090013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Abstract
C-X (X = halogen) bonds are indispensable functional groups in organic synthesis
by mediating a massive number of important organic reactions. While a variety of different
catalytic strategies are available for generating C-X bonds, those methods enabling the C-X
bond formation under transition metal-free conditions via the C-H bond functionalization are
particularly interesting because of the inherent atom economy and environmental friendliness
associated with such methods. Herein, the advancements in the transition metal-free halogenation
of C(2)-H bond are reviewed.
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Affiliation(s)
- Tian Luo
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Shanghui Tian
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
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4
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Rozatian N, Hodgson DRW. Reactivities of electrophilic N-F fluorinating reagents. Chem Commun (Camb) 2021; 57:683-712. [PMID: 33367354 DOI: 10.1039/d0cc06339h] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Electrophilic fluorination represents one of the most direct and useful methods available for the selective introduction of fluorine into organic compounds. Electrophilic fluorinating reagents of the N-F class have revolutionised the incorporation of fluorine atoms into both pharmaceutically- and agrochemically-important substrates. Since the earliest N-F reagents were commercialised in the 1990s, their reactivities have been investigated using qualitative and, more recently, quantitative methods. This review discusses the different experimental approaches employed to determine reactivities of N-F reagents, focussing on the kinetics studies reported in recent years. We make critical evaluations of the experimental approaches against each other, theoretical approaches, and their applicability towards practical problems. The opportunities for achieving more efficient synthetic electrophilic fluorination processes through kinetic understanding are highlighted.
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Affiliation(s)
- Neshat Rozatian
- Chemistry Department, Durham University, South Road, Durham, UKDH1 3LE.
| | - David R W Hodgson
- Chemistry Department, Durham University, South Road, Durham, UKDH1 3LE.
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6
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Sato K, Kawasaki A, Karuo Y, Tarui A, Kawai K, Omote M. Synthesis of new fluorescent molecules having an aggregation-induced emission property derived from 4-fluoroisoxazoles. Beilstein J Org Chem 2020; 16:1411-1417. [PMID: 32647543 PMCID: PMC7323617 DOI: 10.3762/bjoc.16.117] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 06/09/2020] [Indexed: 01/02/2023] Open
Abstract
Fluorescent molecules based on a fluorinated isoxazole scaffold were synthesized and investigated for their photochemical properties. The introduction of a fluorine substituent into 3,5-diarylisoxazoles led to an increase of fluorescence intensity and exhibited a redshift in the emission intensity. α-Fluorinated boron ketoiminates (F-BKIs) were also synthesized via a ring-opening reaction of 4-fluoroisoxazoles and exhibited highly fluorescent luminescence and aggregation-induced emission (AIE), showing promise as a new fluorophore.
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Affiliation(s)
- Kazuyuki Sato
- Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
| | - Akira Kawasaki
- Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
| | - Yukiko Karuo
- Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
| | - Atsushi Tarui
- Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
| | - Kentaro Kawai
- Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
| | - Masaaki Omote
- Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
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7
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Harsanyi A, Lückener A, Pasztor H, Yilmaz Z, Tam L, Yufit DS, Sandford G. α-Fluorotricarbonyl Derivatives as Versatile Fluorinated Building Blocks: Synthesis of Fluoroacetophenone, Fluoroketo Ester and Fluoropyran-4-one Derivatives. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000503] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Antal Harsanyi
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
| | - Anne Lückener
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
| | - Hedvig Pasztor
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
| | - Zahide Yilmaz
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
| | - Lawrence Tam
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
| | - Dmitry S. Yufit
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
| | - Graham Sandford
- Department of Chemistry; Durham University; South Road DH1 3LE Durham U.K
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8
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Das P, Boone S, Mitra D, Turner L, Tandon R, Raucher D, Hamme AT. Synthesis and biological evaluation of fluoro-substituted spiro-isoxazolines as potential anti-viral and anti-cancer agents. RSC Adv 2020; 10:30223-30237. [PMID: 35518245 PMCID: PMC9056317 DOI: 10.1039/d0ra06148d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 08/06/2020] [Indexed: 11/30/2022] Open
Abstract
Electrophilic fluorine-mediated dearomative spirocyclization has been developed to synthesize a range of fluoro-substituted spiro-isoxazoline ethers and lactones. The in vitro biological assays of synthesized compounds were probed for anti-viral activity against human cytomegalovirus (HCMV) and cytotoxicity against glioblastomas (GBM6) and triple negative breast cancer (MDA MB 231). Interestingly, compounds 4d and 4n showed significant activity against HCMV (IC50 ∼ 10 μM), while 4l and 5f revealed the highest cytotoxicity with IC50 = 36 to 80 μM. The synthetic efficacy and biological relevance offer an opportunity to further drug-discovery development of fluoro-spiro-isoxazolines as novel anti-viral and anti-cancer agents. The synthetic efficacy and biological relevance extend an opportunity to further drug-discovery development of fluoro-spiro-isoxazolines as novel anti-viral and anti-cancer agents.![]()
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Affiliation(s)
- Prasanta Das
- Department of Chemistry and Biochemistry
- Jackson State University
- Jackson
- USA
| | - Sarah Boone
- Department of Microbiology and Immunology
- University of Mississippi Medical Center
- Jackson
- USA
| | - Dipanwita Mitra
- Department of Microbiology and Immunology
- University of Mississippi Medical Center
- Jackson
- USA
| | - Lindsay Turner
- Department of Cellular and Molecular Biology
- University of Mississippi Medical Center
- Jackson
- USA
| | - Ritesh Tandon
- Department of Microbiology and Immunology
- University of Mississippi Medical Center
- Jackson
- USA
| | - Drazen Raucher
- Department of Cellular and Molecular Biology
- University of Mississippi Medical Center
- Jackson
- USA
| | - Ashton T. Hamme
- Department of Chemistry and Biochemistry
- Jackson State University
- Jackson
- USA
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9
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Bondarenko OB, Komarov AI, Karetnikov GL, Nikolaeva SN, Zyk NV, Holt T, Kutateladze AG. Diastereoselective heterocyclization of geminal bromo-fluoro arylcyclopropanes by nitrosonium tetrafluoroborate: Access to 4-fluorinated isoxazolines and isoxazoles. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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10
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Rozatian N, Beeby A, Ashworth IW, Sandford G, Hodgson DRW. Enolization rates control mono- versus di-fluorination of 1,3-dicarbonyl derivatives. Chem Sci 2019; 10:10318-10330. [PMID: 32110319 PMCID: PMC6979503 DOI: 10.1039/c9sc04185k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 09/16/2019] [Indexed: 12/27/2022] Open
Abstract
All rate constants for fluorination and enolization are determined.
Fluorine-containing 1,3-dicarbonyl derivatives are essential building blocks for drug discovery and manufacture. To understand the factors that determine selectivity between mono- and di-fluorination of 1,3-dicarbonyl systems, we have performed kinetic studies of keto–enol tautomerism and fluorination processes. Photoketonization of 1,3-diaryl-1,3-dicarbonyl derivatives and their 2-fluoro analogues is coupled with relaxation kinetics to determine enolization rates. Reaction additives such as water accelerate enolization processes, especially of 2-fluoro-1,3-dicarbonyl systems. Kinetic studies of enol fluorination with Selectfluor™ and NFSI reveal the quantitative effects of 2-fluorination upon enol nucleophilicity towards reagents of markedly different electrophilicity. Our findings have important implications for the synthesis of α,α-difluoroketonic compounds, providing valuable quantitative information to aid in the design of fluorination and difluorination reactions.
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Affiliation(s)
- Neshat Rozatian
- Chemistry Department , Durham University , South Road , Durham , DH1 3LE , UK .
| | - Andrew Beeby
- Chemistry Department , Durham University , South Road , Durham , DH1 3LE , UK .
| | - Ian W Ashworth
- AstraZeneca , Pharmaceutical Technology & Development , Macclesfield , SK10 2NA , UK
| | - Graham Sandford
- Chemistry Department , Durham University , South Road , Durham , DH1 3LE , UK .
| | - David R W Hodgson
- Chemistry Department , Durham University , South Road , Durham , DH1 3LE , UK .
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11
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Sato K, Sandford G, Konishi Y, Yanada N, Toda C, Tarui A, Omote M. Lewis acid promoted fluorine-alkoxy group exchange reactions for the synthesis of 5-alkoxy-4,4-difluoroisoxazoline systems. Org Biomol Chem 2019; 17:2818-2823. [DOI: 10.1039/c9ob00097f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lewis acid promoted substitution of fluorine yields novel 5-alkoxylated 4,4-difluoroisoxazolines via SN1 type processes.
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Affiliation(s)
- Kazuyuki Sato
- Faculty of Pharmaceutical Sciences
- Setsunan University
- Hirakata, Osaka 573-0101
- Japan
| | | | - Yukiko Konishi
- Faculty of Pharmaceutical Sciences
- Setsunan University
- Hirakata, Osaka 573-0101
- Japan
| | - Niko Yanada
- Faculty of Pharmaceutical Sciences
- Setsunan University
- Hirakata, Osaka 573-0101
- Japan
| | - Chisako Toda
- Faculty of Pharmaceutical Sciences
- Setsunan University
- Hirakata, Osaka 573-0101
- Japan
| | - Atsushi Tarui
- Faculty of Pharmaceutical Sciences
- Setsunan University
- Hirakata, Osaka 573-0101
- Japan
| | - Masaaki Omote
- Faculty of Pharmaceutical Sciences
- Setsunan University
- Hirakata, Osaka 573-0101
- Japan
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12
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Yang K, Zhang H, Niu B, Tang T, Ge H. Benzisothiazol-3-ones through a Metal-Free Intramolecular N-S Bond Formation. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801090] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ke Yang
- School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
- Department of Chemistry and Chemical Biology; Indiana University Purdue, University Indianapolis; 46202 Indianapolis Indiana USA
| | - Hao Zhang
- School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Ben Niu
- Department of Chemistry and Chemical Biology; Indiana University Purdue, University Indianapolis; 46202 Indianapolis Indiana USA
| | - Tiandi Tang
- School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Haibo Ge
- Department of Chemistry and Chemical Biology; Indiana University Purdue, University Indianapolis; 46202 Indianapolis Indiana USA
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13
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Arcadi A, Chiarini M, Del Vecchio L, Marinelli F. 5-Exo-dig aminocylization/hydroxyfluorination of propargylic carbamates. J Fluor Chem 2018. [DOI: 10.1016/j.jfluchem.2018.04.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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14
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Morita T, Yugandar S, Fuse S, Nakamura H. Recent progresses in the synthesis of functionalized isoxazoles. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.02.020] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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15
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Zeng Q, Zhang L, Xiao Y, Zhang J. Divergent access to N-hydroxypyrroles and isoxazoles via the gold(i)- or Brønsted acid-catalysed regioselective cyclization of N-(2-trifluoromethyl-3-alkynyl) oximes. Org Biomol Chem 2018; 16:1375-1380. [PMID: 29411001 DOI: 10.1039/c7ob03107f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The divergent regioselective cyclization of N-(2-trifluoromethyl-3-alkynyl) oximes by a suitable choice of a gold(i) or a Brønsted acid catalyst, leading to 4-trifluoromethyl-N-hydroxypyrroles or 4-trifluoromethyl-5-alkylisoxazoles was developed. In order to avoid the tedious separation of unstable N-(2-trifluoromethyl-3-alkynyl) oximes, an easy two-step, one-pot synthesis of 4-trifluoromethyl-5-alkylisoxazoles was realized via the sequential oxidation of the corresponding hydroxylamines and subsequent treatment with the reductant, sodium thiosulfate (Na2S2O3). This two-step, one-pot procedure is a complementary method for the synthesis of 4-trifluoromethyl-5-alkylisoxazole from those unstable N-(2-trifluoromethyl-3-alkynyl) oximes.
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Affiliation(s)
- Qin Zeng
- Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, 500. Dongchuan Road, Shanghai, 200062, P. R. China.
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16
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Arisawa M, Yamaguchi M, Tanii S, Tazawa T. Synthesis of Unsymmetric HetAr–X–HetAr’ Compounds by Rhodium-Catalyzed Heteroaryl Exchange Reactions. HETEROCYCLES 2017. [DOI: 10.3987/rev-17-869] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Arisawa M, Tanii S, Tazawa T, Yamaguchi M. Rhodium-catalyzed transformation of heteroaryl aryl ethers into heteroaryl fluorides. Chem Commun (Camb) 2016; 52:11390-11393. [PMID: 27709178 DOI: 10.1039/c6cc05400e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A rhodium complex catalyzed the conversion of the C-O bond of heteroaryl aryl ethers to the C-F bond. The reaction of (4-chlorophenylthio)pentafluorobenzene with heteroaryl aryl ethers provided heteroaryl fluorides and heteroaryl (4-chlorophenylthio)tetrafluorophenyl ethers; this involved the cleavage of a single heteroaryl C-O bond under equilibrium conditions. The reaction of heteroaryl aryl ethers with 2-fluorobenzothiazole in which two heteroaryl and aryl C-O bonds were cleaved provided heteroaryl fluorides and aryl fluorides. The reactions were applicable to five-membered and six-membered heteroaryl aryl ethers and also to diaryl ethers possessing one or two electron-withdrawing groups.
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Affiliation(s)
- Mieko Arisawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan.
| | - Saori Tanii
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan.
| | - Takeru Tazawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan.
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan.
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