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Abe M, Mizukami A, Yoshida E, Kimachi T, Inamoto K. Chlorobenzene-driven palladium-catalysed lactonisation of benzoic acids. RSC Adv 2024; 14:808-811. [PMID: 38174227 PMCID: PMC10759164 DOI: 10.1039/d3ra08176a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 12/18/2023] [Indexed: 01/05/2024] Open
Abstract
Herein, we developed a palladium-catalysed C-H cyclisation of benzoic acids in chlorobenzene without additional oxidants. The key to the success of these reactions is the use of chlorobenzene, which serves a dual role as a solvent and an oxidant, thus providing a simple and efficient method for synthesising phthalides.
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Affiliation(s)
- Masahiro Abe
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University 11-68, 9-Bancho, Koshien Nishinomiya Hyogo 663-8179 Japan
| | - Akiho Mizukami
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University 11-68, 9-Bancho, Koshien Nishinomiya Hyogo 663-8179 Japan
| | - Emi Yoshida
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University 11-68, 9-Bancho, Koshien Nishinomiya Hyogo 663-8179 Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University 11-68, 9-Bancho, Koshien Nishinomiya Hyogo 663-8179 Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University 11-68, 9-Bancho, Koshien Nishinomiya Hyogo 663-8179 Japan
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2
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Abe M, Kawamoto M, Inoue M, Kimachi T, Inamoto K. Gold(I)-Catalyzed Heteroannulation of Salicylic Amides with Alkynes: Synthesis of 1,3-Benzoxazin-4-one Derivatives. Org Lett 2022; 24:5684-5687. [PMID: 35904567 DOI: 10.1021/acs.orglett.2c02066] [Citation(s) in RCA: 0] [Impact Index Per Article: 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
Gold(I)-catalyzed heteroannulation affords the efficient and straightforward construction of heterocyclic compounds. Herein, we developed a gold(I)-catalyzed heteroannulation of salicylic amides with alkynes producing a broad range of 1,3-benzoxazin-4-ones. The utility of this protocol was highlighted by synthesizing variously substituted benzoxazinones containing quaternary carbon centers, showing a high functional group tolerance and excellent atom economy of the thus introduced reaction course.
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Affiliation(s)
- Masahiro Abe
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Megumu Kawamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Mayu Inoue
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
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Abe M, Yokoi Y, Hirata A, Matsuoka Y, Kimachi T, Inamoto K. Site-selective iodine atom transfer in fluorinated alkyl iodides via 1,5-hydrogen atom transfer. Chem Commun (Camb) 2022; 58:7416-7418. [PMID: 35695135 DOI: 10.1039/d2cc02803d] [Citation(s) in RCA: 1] [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: 11/21/2022]
Abstract
The direct and selective functionalization of inert C-H bonds via intramolecular hydrogen atom transfer (HAT) is an increasingly powerful tool in organic synthesis. Herein, we designed an efficient and facile iodine atom transfer in fluorinated alkyl iodides via 1,5-HAT. Our process enables site-selective iodination of unreactive C(sp3)-H bonds to afford di- and tri-fluorinated alkyl iodides in good yields. Furthermore, our process shows excellent atom economy and high functional group tolerance, including methyl, methoxy, chloro, cyano, and silyl moieties.
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Affiliation(s)
- Masahiro Abe
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan.
| | - Yuka Yokoi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan.
| | - Aoi Hirata
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan.
| | - Yumeno Matsuoka
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan.
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan.
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan.
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Abstract
Herein, we designed a simple nitrile synthesis from N-[(2-nitrophenyl)sulfonyl]benzamides via base-promoted intramolecular nucleophilic aromatic substitution. The process features redox-neutral conditions as well as no requirement of toxic cyanide species and transition metals. Our process shows broad scope and various functional group compatibility, affording a variety of (hetero)aromatic nitriles in good to excellent yields.
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Affiliation(s)
- Masahiro Abe
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Sayasa Nitta
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Erina Miura
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
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Abe M, Ueta K, Tanaka S, Kimachi T, Inamoto K. Palladium-catalyzed dehydrogenative C–H cyclization for isoindolinone synthesis. RSC Adv 2021; 11:26988-26991. [PMID: 35479970 PMCID: PMC9037686 DOI: 10.1039/d1ra04661f] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 07/29/2021] [Indexed: 12/30/2022] Open
Abstract
In this paper Pd-catalyzed intramolecular dehydrogenative C(sp3)–H amidation for the synthesis of isoindolinones is described. This method features the use of a Pd/C catalyst and the addition of a stoichiometric amount of oxidant is not necessary. A mechanistic study suggested the possible formation of H2 gas during the reaction. Pd-catalyzed intramolecular dehydrogenative C(sp3)–H amidation for the synthesis of isoindolinones was developed. Use of Pd/C as a catalyst enables the desired cyclization to proceed smoothly without adding any stoichiometric oxidants.![]()
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Affiliation(s)
- Masahiro Abe
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Kaho Ueta
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Saki Tanaka
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
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Hayama N, Kobayashi Y, Sekimoto E, Miyazaki A, Inamoto K, Kimachi T, Takemoto Y. A solvent-dependent chirality-switchable thia-Michael addition to α,β-unsaturated carboxylic acids using a chiral multifunctional thiourea catalyst. Chem Sci 2020; 11:5572-5576. [PMID: 32874501 PMCID: PMC7444369 DOI: 10.1039/d0sc01729a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 03/25/2020] [Accepted: 05/14/2020] [Indexed: 01/19/2023] Open
Abstract
An asymmetric thia-Michael addition of arylthiols to α,β-unsaturated carboxylic acids using a thiourea catalyst that bears arylboronic acid and tertiary amine moieties is reported.
An asymmetric thia-Michael addition of arylthiols to α,β-unsaturated carboxylic acids using a thiourea catalyst that bears arylboronic acid and tertiary amine moieties is reported. Both enantiomers of the Michael adducts can be obtained in high enantioselectivity and good yield merely by changing the solvent. The origin of the chirality switch in the products was examined in each solvent via spectroscopic analyses.
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Affiliation(s)
- Noboru Hayama
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku , Kyoto 606-8501 , Japan . .,School of Pharmacy and Pharmaceutical Sciences , Mukogawa Women's University , 11-68, 9-Bancho, Koshien , Nishinomiya , Hyogo 663-8179 , Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku , Kyoto 606-8501 , Japan .
| | - Eriko Sekimoto
- School of Pharmacy and Pharmaceutical Sciences , Mukogawa Women's University , 11-68, 9-Bancho, Koshien , Nishinomiya , Hyogo 663-8179 , Japan
| | - Anna Miyazaki
- School of Pharmacy and Pharmaceutical Sciences , Mukogawa Women's University , 11-68, 9-Bancho, Koshien , Nishinomiya , Hyogo 663-8179 , Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences , Mukogawa Women's University , 11-68, 9-Bancho, Koshien , Nishinomiya , Hyogo 663-8179 , Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences , Mukogawa Women's University , 11-68, 9-Bancho, Koshien , Nishinomiya , Hyogo 663-8179 , Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku , Kyoto 606-8501 , Japan .
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Haginaka J, Nishimura K, Kimachi T, Inamoto K, Takemoto Y, Kobayashi Y. Retention and molecular-recognition mechanisms of molecularly imprinted polymers for promazine derivatives. Talanta 2019; 205:120149. [PMID: 31450460 DOI: 10.1016/j.talanta.2019.120149] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 04/28/2019] [Revised: 07/11/2019] [Accepted: 07/11/2019] [Indexed: 01/30/2023]
Abstract
Monodisperse molecularly imprinted polymers (MIPs) for promazine derivatives [promazine (PZ), methylpromazine (MPZ), chlorpromazine (CPZ) and bromopromazine (BPZ)], MIPPZ, MIPMPZ, MIPCPZ and MIPBPZ, were prepared using methacrylic acid (MAA) as a functional monomer and ethylene glycol dimethacrylate as a crosslinker by multi-step swelling and polymerization. The retention and molecular-recognition properties of the obtained MIPs were evaluated using LC in hydrophilic interaction chromatography (HILIC) and reversed-phase modes. In computational approaches, intermolecular interaction modes and energies between PZ derivatives and MAAs were evaluated at the HF/6-311G(d,p) level. The interaction energies of PZ, MPZ, CPZ and BPZ with 4 equivalents of MAAs were calculated. The results indicated that the interaction of the aliphatic amine moiety of a PZ derivative with MAA gave almost similar interaction energies at the HF/6-311G(d,p) level, and that the interaction of the sulfur atom of a phenothiazine scaffold with MAA was also the case. The third interaction of the aromatic amine of a PZ derivative with MAA was in the order of MPZ > PZ > CPZ > BPZ presumably due to the change of basicity by the electron-donating or electron-withdrawing effect of a subsituent. Furthermore, the fourth attractive modes of CPZ and BPZ were suggested to be the interaction of their halogen atoms with MAA through both halogen bonding and hydrogen bonding, while PZ and MPZ were suggested to have the weak C-H ⋅⋅⋅ π interaction with MAA. In HILIC mode, the interaction energies at the HF method had good correlation with the retention factor of a PZ derivative on each MIP, indicating that in addition to the shape recognition, the attractive electrostatic interactions would be more responsible for its retention rather than the dispersion energies. Furthermore, in addition to the shape recognition, ionic and hydrophobic interactions, and halogen bonding and hydrogen bonding (the last interaction seems to be weak) seem to work for the retention and molecular-recognition of PZ derivatives on the MIPs in reversed-phase mode.
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Affiliation(s)
- Jun Haginaka
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, Koshien Kyuban-cho, Nishinomiya 663-8179, Japan; Institute for Biosciences, Mukogawa Women's University, 11-68, Koshien Kyuban-cho, Nishinomiya 663-8179, Japan.
| | - Kanae Nishimura
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, Koshien Kyuban-cho, Nishinomiya 663-8179, Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, Koshien Kyuban-cho, Nishinomiya 663-8179, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, 11-68, Koshien Kyuban-cho, Nishinomiya 663-8179, Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida-Shimo-Adachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida-Shimo-Adachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
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Mizukami A, Tsugita M, Shimora M, Tanaka S, Hayama N, Kimachi T, Inamoto K. Rhodium-catalyzed Synthesis of Benzo[ b]thiophene-3-carboxamides via Cyclization of ( ortho-Alkynyl)phenyl Sulfides in the Presence of Isocyanates. CHEM LETT 2019. [DOI: 10.1246/cl.190043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Akiho Mizukami
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Maika Tsugita
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Mako Shimora
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Saki Tanaka
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Noboru Hayama
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
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Inamoto K, Shimizu M, Hayama N, Kimachi T. Copper-Catalyzed Intramolecular C–H Amination: A New Entry to Substituted Xanthine Derivatives. SYNTHESIS-STUTTGART 2017. [DOI: 10.1055/s-0036-1588821] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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
Catalytic synthesis of xanthines was achieved in the presence of a copper catalyst. The process involves copper-catalyzed intramolecular C–H amination of benzamidines that possess a uracil moiety and produces variously substituted xanthines generally in good to high yields. This work introduces a new, facile approach to polysubstituted xanthine compounds.
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Hiroya K, Itoh S, Inamoto K, Shigehisa H, Sakamoto T. Simultaneous Functionalization and Cyclization of 2-Ethynylaniline Derivatives to Indoles. HETEROCYCLES 2017. [DOI: 10.3987/com-16-s(s)60] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Taneda H, Inamoto K, Kondo Y. Palladium-Catalyzed Highly Chemoselective Intramolecular C-H Aminocarbonylation of Phenethylamines to Six-Membered Benzolactams. Org Lett 2016; 18:2712-5. [PMID: 27214155 DOI: 10.1021/acs.orglett.6b01171] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A palladium-catalyzed highly selective intramolecular C-H aminocarbonylation of Br-functionalized phenethylamines in the presence of CO was achieved while leaving the C-Br bond unreacted to afford six-membered benzolactams with good to high yields. The remaining C-Br group in the cyclized product was successfully used as a reactive center for further functionalization through various palladium-catalyzed coupling reactions.
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Affiliation(s)
- Hiroshi Taneda
- Graduate School of Pharmaceutical Sciences, Tohoku University , 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University , 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Yoshinori Kondo
- Graduate School of Pharmaceutical Sciences, Tohoku University , 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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12
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Ogata T, Yoshida T, Shimizu M, Tanaka M, Fukuhara C, Ishii J, Nishiuchi A, Inamoto K, Kimachi T. Unusual, chemoselective etherification of 2-hydroxy-1,4-naphthoquinone derivatives utilizing alkoxymethyl chlorides: scope, mechanism and application to the synthesis of biologically active natural product (±)-lantalucratin C. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.01.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Mizukami A, Ise Y, Kimachi T, Inamoto K. Rhodium-Catalyzed Cyclization of 2-Ethynylanilines in the Presence of Isocyanates: Approach toward Indole-3-carboxamides. Org Lett 2016; 18:748-51. [DOI: 10.1021/acs.orglett.6b00007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [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)
- Akiho Mizukami
- School of Pharmacy and Pharmaceutical
Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Yumi Ise
- School of Pharmacy and Pharmaceutical
Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical
Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical
Sciences, Mukogawa Women’s University, 11-68, 9-Bancho, Koshien, Nishinomiya, Hyogo 663-8179, Japan
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14
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Ogata T, Tanaka M, Ishigaki M, Shimizu M, Nishiuchi A, Inamoto K, Kimachi T. The first enantioselective total synthesis of lantalucratin C and determination of its absolute configuration. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.07.050] [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: 10/23/2022]
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15
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Kuriyama M, Haruta K, Dairaku T, Kawamura T, Kikkawa S, Inamoto K, Tsukamoto H, Kondo Y, Torigoe H, Okamoto I, Ono A, Morita EH, Tanaka Y. Hg2+-trapping beads: Hg2+-specific recognition through thymine-Hg(II)-thymine base pairing. Chem Pharm Bull (Tokyo) 2015; 62:709-12. [PMID: 24990507 DOI: 10.1248/cpb.c13-00918] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mercury pollution poses a severe threat to human health. To remove Hg(2+) from contaminated water, we synthesized Hg(2+)-trapping beads that include oligo-thymidine functionalities that can form thymine-Hg(II)-thymine base pairs on the solid support. The beads can selectively trap Hg(2+) even in the presence of other metal cations. More interestingly, Hg(2+)-trapping efficiency was higher in the presence of the co-existing cations. Thus, the developed Hg(2+)-trapping beads can capture Hg(2+) without affecting the mineral balance of water so much. The Hg(2+)-trapping beads presented here show promise for removing Hg(2+) from environmental water.
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Ogata T, Yoshida T, Tanaka M, Fukuhara C, Shimizu M, Ishii J, Nishiuchi A, Inamoto K, Kimachi T. Unusual <i>O</i>-Alkylation of 2-Hydroxy-1,4-naphthoquinone Utilizing Alkoxymethyl Chlorides. Chem Pharm Bull (Tokyo) 2015; 63:485-8. [DOI: 10.1248/cpb.c15-00220] [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: 11/22/2022]
Affiliation(s)
- Tokutaro Ogata
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Tomoyo Yoshida
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Manami Tanaka
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Chie Fukuhara
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Maki Shimizu
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Junko Ishii
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Arisa Nishiuchi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Kiyofumi Inamoto
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
| | - Tetsutaro Kimachi
- School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women’s University
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Yonemoto-Kobayashi M, Inamoto K, Kondo Y. Desilylative Carboxylation of Aryltrimethylsilanes Using CO2 in the Presence of Catalytic Phosphazenium Salt. CHEM LETT 2014. [DOI: 10.1246/cl.131108] [Citation(s) in RCA: 22] [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: 12/18/2022]
Affiliation(s)
| | | | - Yoshinori Kondo
- Graduate School of Pharmaceutical Sciences, Tohoku University
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18
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Taneda H, Inamoto K, Kondo Y. Direct condensation of functionalized sp3 carbons with formanilides for enamine synthesis using an in situ generated HMDS amide catalyst. Chem Commun (Camb) 2014; 50:6523-5. [DOI: 10.1039/c4cc02228a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Functionalized enamines, including β-enaminoesters were synthesized using in situ generated HMDS amide bases via the combination of aminosilanes and fluoride salts.
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Affiliation(s)
- Hiroshi Taneda
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578, Japan
| | - Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578, Japan
| | - Yoshinori Kondo
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578, Japan
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Inamoto K, Kadokawa J, Kondo Y. Ruthenium-Catalyzed Carbonylative C–H Cyclization of 2-Arylphenols: A Novel Synthetic Route to 6H-Dibenzo[b,d]pyran-6-ones. Org Lett 2013; 15:3962-5. [DOI: 10.1021/ol401734m] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [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)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Jun Kadokawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Yoshinori Kondo
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Yonemoto-Kobayashi M, Inamoto K, Tanaka Y, Kondo Y. Carboxylation of alkynylsilanes with carbon dioxide mediated by cesium fluoride in DMSO. Org Biomol Chem 2013; 11:3773-5. [DOI: 10.1039/c3ob40760h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Inamoto K, Araki Y, Kikkawa S, Yonemoto M, Tanaka Y, Kondo Y. Organocatalytic functionalization of heteroaromatic N-oxides with C-nucleophiles using in situ generated onium amide bases. Org Biomol Chem 2013; 11:4438-41. [DOI: 10.1039/c3ob40782a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Inamoto K, Nozawa K, Kadokawa J, Kondo Y. Efficient use of a surfactant for copper-catalyzed coupling reaction of arylboronic acids with imidazoles in water. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.07.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Inamoto K, Asano N, Nakamura Y, Yonemoto M, Kondo Y. Synthesis of 3-Carboxylated Indoles through a Tandem Process Involving Cyclization of 2-Ethynylanilines Followed by CO2 Fixation in the Absence of Transition Metal Catalysts. Org Lett 2012; 14:2622-5. [DOI: 10.1021/ol300958c] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Narumi Asano
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Yuka Nakamura
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Misato Yonemoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Yoshinori Kondo
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Inamoto K, Hasegawa C, Hiroya K, Kondo Y, Osako T, Uozumi Y, Doi T. Use of dimethyl carbonate as a solvent greatly enhances the biaryl coupling of aryl iodides and organoboron reagents without adding any transition metal catalysts. Chem Commun (Camb) 2012; 48:2912-4. [PMID: 22301882 DOI: 10.1039/c2cc17401d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The coupling reaction of aryl iodides with arylboronic acids to give biaryl compounds can be efficiently performed without adding a transition metal catalyst. The key to success is the use of dimethyl carbonate as a solvent. This finding provides a new strategy for constructing a biaryl linkage.
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Affiliation(s)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
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Inamoto K, Okawa H, Taneda H, Sato M, Hirono Y, Yonemoto M, Kikkawa S, Kondo Y. Organocatalytic deprotonative functionalization of C(sp2)–H and C(sp3)–H bonds using in situ generated onium amide bases. Chem Commun (Camb) 2012; 48:9771-3. [DOI: 10.1039/c2cc35701a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Inamoto K, Asano N, Kobayashi K, Yonemoto M, Kondo Y. A copper-based catalytic system for carboxylation of terminal alkynes: synthesis of alkyl 2-alkynoates. Org Biomol Chem 2012; 10:1514-6. [DOI: 10.1039/c2ob06884b] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Inamoto K, Kawasaki J, Hiroya K, Kondo Y, Doi T. Tandem-type Pd(ii)-catalyzed oxidative Heck reaction/intramolecular C–H amidation sequence: a novel route to 4-aryl-2-quinolinones. Chem Commun (Camb) 2012; 48:4332-4. [DOI: 10.1039/c2cc30600j] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hiroya K, Suwa Y, Ichihashi Y, Inamoto K, Doi T. Total synthesis of optically active lycopladine A by utilizing diastereoselective protection of carbonyl group in a 1,3-cyclohexanedione derivative. J Org Chem 2011; 76:4522-32. [PMID: 21542635 DOI: 10.1021/jo200418y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [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 successfully synthesized two enantiomers of bicyclic enones, (7R,7aR)- and (7S,7aS)-9, from the hemiacetal 2a, which we first synthesized from the symmetrical diketone 1a via diastereoselective carbon-oxygen bond formation between one of the carbonyl groups and the chiral alcohol on the C2 side chain in a 2,2-disubstituted 1,3-cycloalkanedione derivative. We also report the total synthesis of natural (+)-lycopladine A [(+)-6] from (7R,7aR)-9 and the formal synthesis of unnatural (-)-lycopladine A [(-)-6] from (7S,7aS)-9.
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Affiliation(s)
- Kou Hiroya
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba-ku, Sendai, Japan.
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Inamoto K, Nozawa K, Yonemoto M, Kondo Y. Micellar system in copper-catalysed hydroxylation of arylboronic acids: facile access to phenols. Chem Commun (Camb) 2011; 47:11775-7. [DOI: 10.1039/c1cc14974a] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Inamoto K, Hasegawa C, Kawasaki J, Hiroya K, Doi T. Use of Molecular Oxygen as a Reoxidant in the Synthesis of 2-Substituted Benzothiazoles via Palladium-Catalyzed CH Functionalization/Intramolecular CS Bond Formation. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000604] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Inamoto K, Doi T, Shiraishi M, Hiroya K. Facile Conversion of Thioamides into the Corresponding Amides in the Presence of Tetrabutylammonium Bromide. SYNTHESIS-STUTTGART 2010. [DOI: 10.1055/s-0030-1258154] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hiroya K, Ichihashi Y, Suwa Y, Ikai T, Inamoto K, Doi T. Facile synthesis of asymmetric quaternary centers based on diastereoselective protection of the carbonyl group at the symmetrical position. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.05.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Inamoto K, Saito T, Hiroya K, Doi T. Palladium-Catalyzed Intramolecular Amidation of C(sp2)−H Bonds: Synthesis of 4-Aryl-2-quinolinones. J Org Chem 2010; 75:3900-3. [DOI: 10.1021/jo100557s] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Tadataka Saito
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kou Hiroya
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Hiroya K, Ichihashi Y, Furutono A, Inamoto K, Sakamoto T, Doi T. Development of Diastereoselective Birch Reduction−Alkylation Reactions of Bi- and Tricyclic β-Alkoxy-α,β-unsaturated Ketones. J Org Chem 2009; 74:6623-30. [DOI: 10.1021/jo901094x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [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)
- Kou Hiroya
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Yusuke Ichihashi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Ai Furutono
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Takao Sakamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki, Aza Aoba, Aoba-ku, Sendai 980-8578 Japan
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Kuroda JI, Inamoto K, Hiroya K, Doi T. N-Heterocyclic Carbene Derived Nickel-Pincer Complexes: Efficient and Applicable Catalysts for Suzuki-Miyaura Coupling Reactions of Aryl/Alkenyl Tosylates and Mesylates. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900067] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.0] [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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Hiroya K, Kawamoto K, Inamoto K, Sakamoto T, Doi T. Synthesis of the core ring system of awajanomycin from N-Boc-3-methoxycarbonyl-2-pyridinone. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.141] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Inamoto K, Kuroda JI, Kwon E, Hiroya K, Doi T. Pincer-type bis(carbene)-derived complexes of nickel(II): Synthesis, structure, and catalytic activity. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.11.003] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Hiroya K, Takuma K, Inamoto K, Sakamoto T. Synthesis of 6Z-Pandanamine by Regioselective Cyclization Reaction of 2-En-4-ynoic Acid Derivatives Promoted by Weak Base. HETEROCYCLES 2009. [DOI: 10.3987/com-08-s(f)48] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [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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41
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Inamoto K, Doi T, Saito T, Hiroya K. A New Approach to 3-Substituted
Indoles through Palladium-Catalyzed C-H Activation Followed
by Intramolecular Amination Reaction of Enamines. Synlett 2008. [DOI: 10.1055/s-0028-1087413] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Inamoto K, Hasegawa C, Hiroya K, Doi T. Palladium-Catalyzed Synthesis of 2-Substituted Benzothiazoles via a C−H Functionalization/Intramolecular C−S Bond Formation Process. Org Lett 2008; 10:5147-50. [DOI: 10.1021/ol802033p] [Citation(s) in RCA: 248] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Chisa Hasegawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kou Hiroya
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Abstract
Two efficient methods to construct the indazole nucleus have been developed, both of which utilize palladium-catalyzed intramolecular carbon-nitrogen bond formation. One is based on intramolecular Buchwald-Hartwig amination reaction of 2-halobenzophenone tosylhydrazones. The catalyst system we developed for this reaction allows the cyclization to proceed under very mild conditions and thus could be applied to a wide range of substrates with acid- or base-sensitive functional groups. Furthermore, this methodology could be applied for the construction of benzoisoxazole ring system. In addition, catalytic C-H activation with palladium followed by intramolecular amination of benzophenone tosylhydrazones was also accomplished with the aid of the catalyst system such as Pd(OAc)(2)/Cu(OAc)(2)/AgOCOCF(3), which gave another route to indazoles. Using this combination, indazoles with various functional groups could be obtained in good to high yields, especially in the case of substrates having electron donating group such as methoxy group on benzene ring. Interesting chemo- and regioselectivity were also observed in this reaction.
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Affiliation(s)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, Japan.
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Inamoto K, Arai Y, Hiroya K, Doi T. Palladium-catalysed direct synthesis of benzo[b]thiophenes from thioenols. Chem Commun (Camb) 2008:5529-31. [DOI: 10.1039/b811362a] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Inamoto K, Kuroda JI, Sakamoto T, Hiroya K. Catalytic Activities of a Bis(carbene)-Derived Nickel(II)-Pincer Complex in Kumada-Tamao-Corriu and Suzuki-Miyaura Coupling Reactions for the Synthesis of Biaryl Compounds. SYNTHESIS-STUTTGART 2007. [DOI: 10.1055/s-2007-983845] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Inamoto K, Saito T, Katsuno M, Sakamoto T, Hiroya K. Palladium-Catalyzed C−H Activation/Intramolecular Amination Reaction: A New Route to 3-Aryl/Alkylindazoles. Org Lett 2007; 9:2931-4. [PMID: 17595097 DOI: 10.1021/ol0711117] [Citation(s) in RCA: 248] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A method for the catalytic C-H activation of hydrazone compounds followed by intramolecular amination is described. It requires the use of a catalytic amount of Pd(OAc)2 in the presence of Cu(OAc)2 and AgOCOCF3, which efficiently effects the cyclization to afford variously substituted indazoles. The reactions proceed under relatively mild conditions and thus tolerate a variety of functional groups, including alkoxycarbonyl and cyano groups and halogen atoms.
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Affiliation(s)
- Kiyofumi Inamoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
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Inamoto K, Katsuno M, Yoshino T, Arai Y, Hiroya K, Sakamoto T. Synthesis of 3-substituted indazoles and benzoisoxazoles via Pd-catalyzed cyclization reactions: application to the synthesis of nigellicine. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.010] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Inamoto K, Kuroda JI, Hiroya K, Noda Y, Watanabe M, Sakamoto T. Synthesis and Catalytic Activity of a Pincer-Type Bis(imidazolin-2-ylidene) Nickel(II) Complex. Organometallics 2006. [DOI: 10.1021/om060043+] [Citation(s) in RCA: 138] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
BACKGROUND We evaluated the value of computed tomographic (CT) gastric virtual endoscopy (VE) by comparing it with real gastric fiberscopy (GF). METHODS Sixty-six VE findings in 63 patients were compared with lesions found with GF. After a GF examination, the examinees were given bubble-making granules for the stomach and placed in a supine position on the CT table. Abdominal CT slices of 1 mm thickness were obtained by multidetector row CT (Siemens Sensation 16) and reconstructed to VE images with volume and surface rendering on the same day. RESULTS VE images were successful in showing subtle alterations in the gastric mucosal folds. Gastric cancer, polyps, ulcers, erosions, and gastritis were clearly visualized. Comparison studies between VE and GF (as the gold standard) showed a sensitivity of 92.7% and a specificity of 90.9%. Original CT images were also useful in detecting lesions in other abdominal organs such as the liver, adrenal gland, and kidney. CONCLUSION Because VE is a good noninvasive screening method, except for minimal radiation exposure, it is expected to become a new technique for stomach examinations.
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Affiliation(s)
- K Inamoto
- Iseikai Hospital, Sophia Health Improvement Center, 6-2-25, Sugahara, Higashiyodogawa-ku, Osaka 533-0022, Japan.
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Inamoto K, Kuroda JI, Danjo T, Sakamoto T. Highly Efficient Nickel-Catalyzed Heck Reaction Using Ni(acac)2/N-Heterocyclic Carbene Catalyst. Synlett 2005. [DOI: 10.1055/s-2005-869854] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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