論文 - 片桐 幸輔
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Conformational Properties of Aromatic Amides Bearing Imidazole Ring and Acid-Induced Trans–Cis Amide Switching
Chiharu Takubo, Sakiko Kimura, Mami Ichinomiya, Arisa Hayakawa, Mako Murata, Ko Urushibara, Hyuma Masu, Kosuke Katagiri, Masatoshi Kawahata, Mayumi Kudo, Isao Azumaya, Hiroyuki Kagechika, Aya Tanatani
The Journal of Organic Chemistry 2022年9月
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Investigating the synthesis and structure of [2]pseudorotaxanes assembled by crown ether as wheel component and dual-cation axle with phosphonium and ammonium cations
Naoki Fujimoto, Koshiro Isono, Kosuke Katagiri
Journal of Molecular Structure 1259 132721 - 132721 2022年7月
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Crystal structures and solution behavior of cis-di(aqua)bis(2,2 '-bipyridine)cobalt(III) and related complexes
Mari Toyama, Yu Yamamoto, Takuya Yoshimoto, Kosuke Katagiri
JOURNAL OF MOLECULAR STRUCTURE 1244 2021年11月
出版者・発行元:ELSEVIER
A cobalt(III) complex bearing two 2,2'-bipyridine (bpy) ligands and two aqua ligands, cis-[Co(bpy)(2)(OH2)(2)][OTf](3)center dot H2O (1 center dot[OTf](3)center dot H2O; OTf- = CF3SO3-), was obtained from the reaction of [Co(bpy)(2)(CO3)][OTf]center dot 0.5H(2)O with aqueous HOTf (HOTf = HCF3SO3, trifluoromethanesulfonic acid). The prepared complex was characterized by single-crystal X-ray crystallographic and elemental analyses, and its solution behavior was investigated by H-1 NMR spectroscopy. Our study of 1 center dot[OTf](3)center dot H2O revealed that it is stable in water and acetone upon heating; however, in methanol and ethanol, the complex was unstable upon heating, forming [Co(bpy)(3)](3+). In addition, upon the reaction of 1 center dot[OTf](3)center dot H2O with picolinic acid (Hpic) in acetone at 295 K, [Co(bpy)(2)(pic)][OTf](2) (2 center dot[OTf](2)) was gradually and selectively precipitated from the reaction solution in 82% yield. Moreover, the reaction between 1 center dot[OTf](3)center dot H2O, NaOH, and H2O2 in water at room temperature produced the dinuclear complex [Co-2(bpy)(4)(mu-O-2)(mu-OH)][PF6](3) (3 center dot[PF6](3)) in good yield (92%) and with excellent purity. The structures of 1 center dot[OTf](3)center dot H2O and 2 center dot[PF6](2) were determined by single-crystal X-ray crystallographic analysis. (C) 2021 Elsevier B.V. All rights reserved.
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Accessing Improbable Foldamer Shapes with Strained Macrocycles
Ko Urushibara, Yann Ferrand, Zhiwei Liu, Kosuke Katagiri, Masatoshi Kawahata, Estelle Morvan, Ryan D'Elia, Vojislava Pophristic, Aya Tanatani, Ivan Huc
Chemistry – A European Journal 27 ( 43 ) 11205 - 11215 2021年8月
出版者・発行元:Wiley
その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.202101201
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Construction of Aromatic Multilayered Structures Based on the Conformational Properties of N,N’-Dimethylated Squaramide
Maiko Arimura, Kimiko Tanaka, Midori Kanda, Ko Urushibara, Shinya Fujii, Kosuke Katagiri, Isao Azumaya, Hiroyuki Kagechika, Aya Tanatani
ChemPlusChem 86 ( 1 ) 198 - 205 2021年1月
出版者・発行元:Wiley
© 2021 Wiley-VCH GmbH Squaramide is a highly rigid four-membered ring system bearing two carbonyl and two amino groups, and its derivatives have found applications in many fields. We synthesized several N,N’-dimethylated oligosquaramides linked via phenyl groups, and investigated their structures in the crystalline state and in solution. Compounds 1, 2 (bissquaramides), and 13 (trissquaramide) exist as folded structures in the crystalline state, in which the aromatic rings are located in a face-to-face position. In their multilayered structures, the benzene rings are more nearly parallel and are closer to each other, compared with those in N,N’-dimethylated oligoureas. Individual molecules of meta-connected compounds 2 and 13 show a helical structure with all-R or all-S axis chirality, but afford only racemic crystals. The NMR spectra indicated that these compounds retain well-ordered folded structures in solution. The unique steric and electronic properties of N,N’-dimethylated squaramide can provide access to novel functional aromatic multilayered and helical foldamers.
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Oxaphosphacyclophanes Constructed from a Bis(triphenylphosphine oxide) Moiety Linked by Dioxyalkyl Chains: Synthesis and Crystal Structures 査読あり
Kosuke Katagiri, Masahiro Ohara, Masahiro Ikehara, Ikkei Higashimura, and Koshiro Isono
ACS Omega 5 23621 - 23630 2020年
共著
出版者・発行元:Americal Chemical Society
Oxaphosphacyclophanes, a bis(triphenylphosphine oxide) moiety
linked by dioxypropane, dioxybutane, dioxypentane, and dioxyhexane, were
synthesized from the reaction of bis(4-hydroxyphenyl)phenylphosphine oxide
and dibromoalkanes. Single-crystal X-ray diffraction analysis and exploring
intermolecular interactions by using the Hirshfeld surface revealed that the
butylene-linked oxaphosphacyclophane (2) had a one-dimensional (1D)
supramolecular structure via CH/π interactions between the terminal phenyl
group of 2 and a phenylene group of the cavities. In the packing diagram of
pentylene-linked oxaphosphacyclophane (3) with antiform, one macrocycle
recognized two terminal phenyl groups to form a 1D supramolecular chain via
π/π interactions. The syn-form of 3 was obtained by the recrystallization from
toluene and CHCl3. In this crystal, a toluene molecule avoid construction of a
1D chain. The antiform of hexylene-linked oxaphosphacyclophane 4 was
obtained by the recrystallization from cyclohexane and CHCl3. Cyclohexane
was captured in the cavity via CH/π interactions. Two molecules of 4 with the syn-form recognized each other to construct a
dimeric structure via CH/π interactions. -
Synthesis and chiroptical properties of cylindrical macrocycles comprising two calix[3]aramide moieties 査読あり
Yuuki Saito, Misa Satake,Ryuichi Mori,Misaki Okayasu, Hyuma Masu, Masahide Tominaga, Kosuke Katagiri, Kentaro Yamaguchi, Shoko Kikkawa, Hidemasa Hikawa and Isao Azumaya
Organic & Biomolecular Chemistry 18 230 - 236 2020年
共著
出版者・発行元:Royal society of chemistry
Calix[3]aramide-based cylindrical macrocycles were synthesized by the one-step amide coupling reaction
of a monomer containing two meta-alkylaminobenzoic acid units linked by para-phenylene bridges. The
major products included a meso-form and an enantiomeric pair, with stereochemistry derived from the
direction of the amide bonds and their fixed conformation. Mirror-image ECD, VCD, and CPL spectra
were observed in the enantiomeric pair and the absolute structure was determined by comparing
measured and calculated ECD and VCD spectra. -
Photoreaction of anthracenyl phosphine oxides: Usual reversible photo- and heat-induced emission switching, and unusual oxidative P–C bond cleavage 査読あり
Kosuke Katagiri, Yukina Yamamoto, Yuhi Takahata, Ryoga Kishibe
Tetrahedron Letters 60 ( 30 ) 2026 2019年6月
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Hydrogen-bonded structures from adamantane-based catechols
Kawahata Masatoshi, Matsuura Miku, Tominaga Masahide, Katagiri Kosuke, Yamaguchi Kentaro
JOURNAL OF MOLECULAR STRUCTURE 1164 116 - 122 2018年7月
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Aqua coordination to attenuate the luminescence properties of europium(III)-phosphine oxide porous coordination polymers
Katagiri Kosuke, Matsuo Naoya, Kawahata Masatoshi, Masu Hyuma, Yamaguchi Kentaro
NEW JOURNAL OF CHEMISTRY 41 ( 16 ) 8305 - 8311 2017年8月
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Aqua Coordination to Attenuate the Luminescence Properties of Europium(III)-Phosphine Oxide Coordination Polymers 査読あり
Kosuke Katagiri, Naoya Matsuo, Masatoshi Kawahata, Hyuma Masu, Kentaro Yamaguchi
New Journal of Chemistry 41 8305 - 8311 2017年7月
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Crystal Structure of a Methanesulfonate Salt of 3-(N-Methyl)quinolinium Boronic Acid 査読あり
Tomoyuki Takeyama, Yuki Nakajima, Kosuke Katagiri, Satoshi Iwatsuki
X-Ray Structure Analysis Online 33 9 - 10 2017年2月
共著
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Crystal Structure of a Methanesulfonate Salt of 3-(N-Methyl)quinolinium Boronic Acid
Takeyama Tomoyuki, Nakajima Yuki, Katagiri Kosuke, Iwatsuki Satoshi
X-RAY STRUCTURE ANALYSIS ONLINE 33 9 - 10 2017年2月
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Vesicle Formation of Three-dimensional Trinuclear Silver(I) Complexes Built from Tris-NHC Ligands Bearing Long Alkyl Chains
Tominaga Masahide, Kawaguchi Taichi, Ohara Kazuaki, Yamaguchi Kentaro, Katagiri Kosuke, Itoh Tsutomu, Azumaya Isao
CHEMISTRY LETTERS 45 ( 10 ) 1201 - 1203 2016年10月
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Coordination structure and extraction behavior of a silver ion with N-substituted-9-aza-3,6,12,15-tetrathiaheptadecanes: significant effect of Ph-C-N framework on the extractability
Iwatsuki Satoshi, Ichiyama Atsushi, Tanooka Syogo, Toyama Mari, Katagiri Kosuke, Kawahata Masatoshi, Yamaguchi Kentaro, Danjo Hiroshi, Chayama Kenji
DALTON TRANSACTIONS 45 ( 31 ) 12548 - 12558 2016年8月
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Vesicle Formation of Three-dimensional Trinuclear Silver(I) Complexes Built from Tris-NHC Ligands Bearing Long Alkyl Chains 査読あり
Masahide Tominaga, Taichi Kawaguchi, Kazuaki Ohara, Kentaro Yamaguchi, Kosuke Katagiri, Tsutomu Itoh, Isao Azumaya
Chemistry Letters 45 1201 - 1203 2016年8月
共著
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Coordination structure and extraction behavior of a silver ion with N-substituted-9-aza-3,6,12,15-tetrathiaheptadecanes: significant effect of Ph–C–N framework on the extractability 査読あり
Satoshi Iwatsuki, Atsushi Ichiyama, Syogo Tanooka, Mari Toyama, Kosuke Katagiri, Masatoshi Kawahata, Kentaro Yamaguchi, Hiroshi Danjo, Kenji Chayama
Dalton Transactions 45 12548 - 12558 2016年7月
共著
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Control of a Chiral Property of a Calix[3]aramide: The Racemization Suppressed by Intramolecular Cyclic Hydrogen Bonds and DMSO–H2O System-Induced Spontaneous Resolution 査読あり
Kosuke Katagiri, Shinsuke Komagawa, Masanobu Uchiyama, Kentaro Yamaguchi, Isao Azumaya
Organic Letters 17 3650 - 3653 2015年7月
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Channel-dependent conformations of single-strand polymers in organic networks composed of tetrapodal adamantanes with N-heterocyclic moieties (vol 55, pg 5789, 2014)
Tominaga Masahide, Iekushi Akitaka, Katagiri Kosuke, Ohara Kazuaki, Yamaguchi Kentaro, Azumaya Isao
TETRAHEDRON LETTERS 56 ( 27 ) 4143 - 4144 2015年7月
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Multilayered Inclusion Nanocycles of Anionic Spiroborates
Danjo Hiroshi, Kidena Yuki, Kawahata Masatoshi, Sato Hiroyasu, Katagiri Kosuke, Miyazawa Toshifumi, Yamaguchi Kentaro
ORGANIC LETTERS 17 ( 10 ) 2466 - 2469 2015年5月