1
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Sun C, Inokuma T, Tsuji D, Yamaoka Y, Akagi R, Yamada KI. Total synthesis of 1,4a-di- epi-ent-pancratistatin, exemplifying a stereodivergent approach to pancratistatin isomers. Chem Commun (Camb) 2024; 60:6757-6760. [PMID: 38864269 DOI: 10.1039/d4cc02199a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
The total synthesis of 1,4a-di-epi-ent-pancratistatin, a novel stereoisomer of the anti-tumor Amaryllidaceae alkaloid pancratistatin, was achieved in 14 steps starting from D-mannitol. The construction of the pancratistatin skeleton involved conjugate addition of organocuprate to a nitrosoolefin, which was generated in situ from inosose oxime. This was followed by stereoselective reduction of the oxime to an amine and site-selective formylation. Biological evaluations revealed that the newly synthesized compounds exhibit cytotoxicity toward cancer cells and significant ferroptosis inhibitory activity. These compounds constitute a promising small-molecule library for the development of potent bioactive agents.
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Affiliation(s)
- Chunzhao Sun
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
- Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Daisuke Tsuji
- Faculty of Pharmacy, Yasuda Women's University, Asaminami-ku, Hiroshima 731-0153, Japan
| | - Yousuke Yamaoka
- School of Pharmacy, Hyogo Medical University, Chuo-ku, Kobe, Hyogo 650-8530, Japan
| | - Reiko Akagi
- Faculty of Pharmacy, Yasuda Women's University, Asaminami-ku, Hiroshima 731-0153, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
- Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
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2
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Sugano M, Inokuma T, Yamaoka Y, Yamada KI. 5- exo-Selective asymmetric bromolactonization of stilbenecarboxylic acids catalyzed by phenol-bearing chiral thiourea. Org Biomol Chem 2024; 22:1765-1769. [PMID: 38099597 DOI: 10.1039/d3ob01895d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
We developed a novel thiourea Lewis-base catalyst with phenol moieties for the enantioselective 5-exo-bromolactonization of stilbenecarboxylic acids to afford chiral 3-substituted phthalides. The phenol moieties are crucial for the enantio- and regio-selectivity.
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Affiliation(s)
- Masayuki Sugano
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
- Research Cluster on "Key Material Development, " Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
- Research Cluster on "Key Material Development, " Tokushima University, Shomachi, Tokushima 770-8505, Japan
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3
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Inokuma T, Iritani K, Takahara Y, Sun C, Yamaoka Y, Kuwano S, Yamada KI. Remote electronic effect on the N-heterocyclic carbene-catalyzed asymmetric intramolecular Stetter reaction and structural revision of products. Chem Commun (Camb) 2023; 59:5375-5378. [PMID: 36939087 DOI: 10.1039/d3cc00693j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
The remote electronic effects of chiral N-heterocyclic carbene catalysts on the asymmetric intramolecular Stetter reaction are investigated. The reaction rate and enantioselectivity were markedly influenced by a substituent at a remote position of the catalyst. The absolute configurations of the products are revised on the basis of X-ray diffraction. Density-functional theory calculations rationalize the improvement of the enantioselectivity using an electron-deficient catalyst.
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Affiliation(s)
- Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan. .,Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Kohei Iritani
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Yuki Takahara
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Chunzhao Sun
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan.
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Satoru Kuwano
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan. .,Research Cluster on "Key Material Development", Tokushima University, Shomachi, Tokushima 770-8505, Japan
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4
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Inokuma T, Masui K, Fukuhara K, Yamada KI. Preparation of N-2-Nitrophenylsulfenyl Imino Peptides and Their Catalyst-Controlled Diastereoselective Indolylation. Chemistry 2023; 29:e202203120. [PMID: 36369610 DOI: 10.1002/chem.202203120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/10/2022] [Accepted: 11/11/2022] [Indexed: 11/13/2022]
Abstract
N-2-Nitrophenylsulfenyl imino dipeptides bearing various functional groups were successfully prepared by MnO2 -mediated oxidation and then subjected to diastereoselective indolylation. Each diastereomer of the adduct was selectively obtained from the same substrates using the appropriate chiral phosphoric acid catalysts. These transformations would be useful for synthesizing non-canonical amino acid-containing peptides as novel drug candidates.
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Affiliation(s)
- Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan.,Research Cluster on "Key Material Development", Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
| | - Kana Masui
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
| | - Koki Fukuhara
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
| | - Ken-Ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima, Japan.,Research Cluster on "Key Material Development", Tokushima University, 1-78-1 Shomachi, Tokushima, Japan
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5
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Yamada KI, Yamauchi A, Fujiwara T, Hashimoto K, Wang Y, Kuwano S, Inokuma T. Kinetic Resolution of α‐Hydroxyamide via N‐Heterocyclic Carbene‐Catalyzed Acylation. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200452] [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]
Affiliation(s)
- Ken-ichi Yamada
- Tokushima University Graduate School of Pharmaceutical Sciences Shomachi 770-8505 Tokushima JAPAN
| | - Akiho Yamauchi
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Tatsuya Fujiwara
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Keiji Hashimoto
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Yinli Wang
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Satoru Kuwano
- Kyoto University: Kyoto Daigaku Graduate School of Pharmaceutical Sciences JAPAN
| | - Tsubasa Inokuma
- University of Tokushima: Tokushima Daigaku Graduate School of Pharmaceutical Sciences JAPAN
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6
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Wang Y, Yamauchi A, Hashimoto K, Fujiwara T, Inokuma T, Mitani Y, Ute K, Kuwano S, Yamaoka Y, Takasu K, Yamada KI. Enhanced Molecular Recognition through Substrate–Additive Complex Formation in N-Heterocyclic-Carbene-Catalyzed Kinetic Resolution of α-Hydroxythioamides. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yinli Wang
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Akiho Yamauchi
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Keiji Hashimoto
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Tatsuya Fujiwara
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
| | - Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
- Research Cluster on “Innovative Chemical Sensing”, Tokushima University,
Shomachi, Tokushima 770-8505, Japan
| | - Yuta Mitani
- Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima 770-8506, Japan
| | - Koichi Ute
- Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima 770-8506, Japan
| | - Satoru Kuwano
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-ichi Yamada
- Graduate School of Pharmaceutical Sciences, Tokushima University, Shomachi, Tokushima 770-8505, Japan
- Research Cluster on “Innovative Chemical Sensing”, Tokushima University,
Shomachi, Tokushima 770-8505, Japan
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7
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Yamasaki K, Yamauchi A, Inokuma T, Miyakawa Y, Wang Y, Oriez R, Yamaoka Y, Takasu K, Tanaka N, Kashiwada Y, Yamada K. Mechanistic Support for Intramolecular Migrative Cyclization of Propargyl Sulfones Provided by Catalytic Asymmetric Induction with a Chiral Counter Cation Strategy. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100274] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kohta Yamasaki
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Akiho Yamauchi
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Tsubasa Inokuma
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
- Research Cluster on “Innovative Chemical Sensing” Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Yasunori Miyakawa
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Yinli Wang
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Raphaël Oriez
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Yousuke Yamaoka
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Kiyosei Takasu
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Naonobu Tanaka
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Yoshiki Kashiwada
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
| | - Ken‐ichi Yamada
- Graduate School of Pharmaceutical Sciences Tokushima University Shomachi, Tokushima 770-8505 Japan
- Research Cluster on “Innovative Chemical Sensing” Tokushima University Shomachi, Tokushima 770-8505 Japan
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8
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Iwai K, Ono M, Nanjo Y, Ema T. Minimization of Amounts of Catalyst and Solvent in NHC-Catalyzed Benzoin Reactions of Solid Aldehydes: Mechanistic Consideration of Solid-to-Solid Conversion and Total Synthesis of Isodarparvinol B. ACS OMEGA 2020; 5:10207-10216. [PMID: 32391509 PMCID: PMC7203951 DOI: 10.1021/acsomega.0c01141] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Accepted: 04/08/2020] [Indexed: 05/03/2023]
Abstract
Attempts were made to minimize the amounts of catalyst and solvent in the NHC-catalyzed benzoin reactions of solid aldehydes. In some case, solid-to-solid conversions proceeded in the solvent-free NHC-catalyzed benzoin reactions. Even if a mixture of the substrate, N-heterocyclic carbene (NHC) precursor, and inorganic base was initially a powdery solid, the reaction did proceed at reaction temperature lower than the melting points of each compound. The solid mixture partially melted or became a slurry or suspension in the meantime. We call this solid/liquid mixture a semisolid state. The reaction giving an optically active product was faster than that giving a racemic mixture of the same product. Melting-point depression was observed for a series of mixtures of the substrate and product in different substrate/product ratios. Solvent-free solid-to-solid conversions were accelerated by the formation of a semisolid state resulting from the melting-point depression of the solid substrate accompanied by the product formation. In the case of solid substrates with high melting points, melting-point depression was useless, and the addition of a small amount of solvent was needed. The first total synthesis of isodarparvinol B was achieved via the NHC-catalyzed intramolecular benzoin reaction using a small amount of solvent as an additive.
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Barik S, Biju AT. N-Heterocyclic carbene (NHC) organocatalysis using aliphatic aldehydes. Chem Commun (Camb) 2020; 56:15484-15495. [DOI: 10.1039/d0cc06867e] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Recent advances are presented in NHC catalysis employing aliphatic aldehydes as substrates for the generation of various carbene-bound intermediates and subsequent interception with electrophiles/nucleophiles.
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Affiliation(s)
- Shilpa Barik
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Akkattu T. Biju
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
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10
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Sun F, Yin T, Wang Y, Feng A, Yang L, Wu W, Yu C, Li T, Wei D, Yao C. A combined experimental and computational study of NHC-promoted desulfonylation of tosylated aldimines. Org Chem Front 2020. [DOI: 10.1039/c9qo01402k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
NHC-catalyzed mild desulfonylation of tosylated aldimines provides efficient access to aryl nitriles with broad substrate scope. DFT calculations demonstrate that the reaction undergoes multiple stepwise processes.
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12
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Hu Y, Pan D, Cong L, Yao Y, Yu C, Li T, Yao C. NHC-Catalyzed Efficient Syntheses of Isoquinolinones or Isochromanones through Formal [4+2] Cycloaddition of o
-Quinodimethanes with Acylhydrazones or Ketones. ChemistrySelect 2018. [DOI: 10.1002/slct.201702925] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Yong Hu
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
| | - Di Pan
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
| | - Lin Cong
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
| | - Yibiao Yao
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
| | - Chenxia Yu
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
| | - Tuanjie Li
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
| | - Changsheng Yao
- Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials; School of Chemistry and Materials Science; Jiangsu Normal university, Xuzhou; Jiangsu 221116, P.R. China
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