1
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Kano T, Uozumi R, Maruyama T, Tada N, Itoh A. Modular Synthesis of Tripeptide Analogs with an Aminobitriazole Skeleton Using Diynyl Benziodoxolone as a Trivalent Platform. J Org Chem 2024; 89:11761-11765. [PMID: 39082689 DOI: 10.1021/acs.joc.4c00999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
A new synthesis method of tripeptide analogs with an aminobitriazole skeleton was proposed. The method involves assembling three amino acid-derived modules at the amino group site and onto a triisopropylsilyl diynyl benziodoxolone by copper-catalyzed electrophilic diynylation of amino acid-derived sulfonamides, chemoselective azide-alkyne cycloadditions with amino acid-derived azides, and deprotection. Various complex aminobitriazoles substituted with pyrene, nucleoside, and N-acetylglucosamine were also synthesized. The produced aminobitriazoles have three sp3 chiral centers and a C-N axial chirality.
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Affiliation(s)
- Takashi Kano
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Ryusei Uozumi
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | | | - Norihiro Tada
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Akichika Itoh
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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2
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Kumar R, Dohi T, Zhdankin VV. Organohypervalent heterocycles. Chem Soc Rev 2024; 53:4786-4827. [PMID: 38545658 DOI: 10.1039/d2cs01055k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
This review summarizes the structural and synthetic aspects of heterocyclic molecules incorporating an atom of a hypervalent main-group element. The term "hypervalent" has been suggested for derivatives of main-group elements with more than eight valence electrons, and the concept of hypervalency is commonly used despite some criticism from theoretical chemists. The significantly higher thermal stability of hypervalent heterocycles compared to their acyclic analogs adds special features to their chemistry, particularly for bromine and iodine. Heterocyclic compounds of elements with double bonds are not categorized as hypervalent molecules owing to the zwitterionic nature of these bonds, resulting in the conventional 8-electron species. This review is focused on hypervalent heterocyclic derivatives of nonmetal main-group elements, such as boron, silicon, nitrogen, carbon, phosphorus, sulfur, selenium, bromine, chlorine, iodine(III) and iodine(V).
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Affiliation(s)
- Ravi Kumar
- Department of Chemistry, J C Bose University of Science and Technology, YMCA, NH-2, Sector-6, Mathura Road, Faridabad, 121006, Haryana, India.
| | - Toshifumi Dohi
- Graduate School of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan.
| | - Viktor V Zhdankin
- Department of Chemistry and Biochemistry, 1038 University Drive, 126 HCAMS University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
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3
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Sasaki S, Kikuchi J, Ito S, Yoshikai N. Stereoselective Approach to Multisubstituted Enolates from Unactivated Alkynes: Oxyalkylidenation of Alkynyl Ketone Enolates with Aldehydes. J Org Chem 2023; 88:14096-14104. [PMID: 37733580 DOI: 10.1021/acs.joc.3c01615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
The preparation of multisubstituted enolates with precise regio- and stereocontrol is a nontrivial task when conventional deprotonation methods are used on the corresponding carbonyl compounds. We describe herein an approach to preparing stereodefined enolates by leveraging the stereoselective oxyfunctionalization of unactivated alkynes, particularly in the context of the alkynylogous aldol reaction. trans-Iodo(III)acetoxylation of alkynes and subsequent Sonogashira coupling allow for the facile preparation of multisubstituted enynyl acetates, which can be deacetylated by MeLi into the corresponding enolates. The alkynyl enolates react with aldehydes to afford γ,δ-unsaturated β-diketones through a cascade of alkynylogous aldol addition, intramolecular Michael addition, and ring opening of the oxetene intermediate.
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Affiliation(s)
- Shuma Sasaki
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Jun Kikuchi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Shingo Ito
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Naohiko Yoshikai
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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4
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Rao WH, Li YG, Jiang LL, Li Q, Zou GD, Cao X. Metal-Free Selective Ortho-C-H Amidation of Hypervalent(III) Iodobezenes with N-Methoxy Amides under Mild Conditions. J Org Chem 2023; 88:13825-13837. [PMID: 37737590 DOI: 10.1021/acs.joc.3c01472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
A metal-free selective ortho-C-H amidation of aryl iodines(III) with the use of N-methoxy amides as aminating reagents under mild conditions is described here. In the protocol, excellent chemoselectivity and high regioselectivity were obtained. Notably, the iodine substituent rendered the amidation product suitable to be used for further elaboration.
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Affiliation(s)
- Wei-Hao Rao
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
- Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Ying-Ge Li
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Li-Li Jiang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Qi Li
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Guo-Dong Zou
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Xinhua Cao
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
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5
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Liu XY, Ji X, Heinis C, Waser J. Peptide-Hypervalent Iodine Reagent Chimeras: Enabling Peptide Functionalization and Macrocyclization. Angew Chem Int Ed Engl 2023; 62:e202306036. [PMID: 37311172 DOI: 10.1002/anie.202306036] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 06/15/2023]
Abstract
Herein, we report a novel strategy for the modification of peptides based on the introduction of highly reactive hypervalent iodine reagents-ethynylbenziodoxolones (EBXs)-onto peptides. These peptide-EBXs can be readily accessed, by both solution- and solid-phase peptide synthesis (SPPS). They can be used to couple the peptide to other peptides or a protein through reaction with Cys, leading to thioalkynes in organic solvents and hypervalent iodine adducts in water buffer. Furthermore, a photocatalytic decarboxylative coupling to the C-terminus of peptides was developed using an organic dye and was also successful in an intramolecular fashion, leading to macrocyclic peptides with unprecedented crosslinking. A rigid linear aryl alkyne linker was essential to achieve high affinity for Keap1 at the Nrf2 binding site with potential protein-protein interaction inhibition.
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Affiliation(s)
- Xing-Yu Liu
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL, 1015, Lausanne, Switzerland
| | - Xinjian Ji
- Laboratory of Therapeutic Proteins and Peptides, Ecole Polytechnique Fédérale de Lausanne, EPFL, 1015, Lausanne, Switzerland
| | - Christian Heinis
- Laboratory of Therapeutic Proteins and Peptides, Ecole Polytechnique Fédérale de Lausanne, EPFL, 1015, Lausanne, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL, 1015, Lausanne, Switzerland
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6
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Mironova IA, Noskov DM, Yoshimura A, Yusubov MS, Zhdankin VV. Aryl-, Akynyl-, and Alkenylbenziodoxoles: Synthesis and Synthetic Applications. Molecules 2023; 28:2136. [PMID: 36903382 PMCID: PMC10004369 DOI: 10.3390/molecules28052136] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/19/2023] [Accepted: 02/20/2023] [Indexed: 03/02/2023] Open
Abstract
Hypervalent iodine reagents are in high current demand due to their exceptional reactivity in oxidative transformations, as well as in diverse umpolung functionalization reactions. Cyclic hypervalent iodine compounds, known under the general name of benziodoxoles, possess improved thermal stability and synthetic versatility in comparison with their acyclic analogs. Aryl-, alkenyl-, and alkynylbenziodoxoles have recently received wide synthetic applications as efficient reagents for direct arylation, alkenylation, and alkynylation under mild reaction conditions, including transition metal-free conditions as well as photoredox and transition metal catalysis. Using these reagents, a plethora of valuable, hard-to-reach, and structurally diverse complex products can be synthesized by convenient procedures. The review covers the main aspects of the chemistry of benziodoxole-based aryl-, alkynyl-, and alkenyl- transfer reagents, including preparation and synthetic applications.
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Affiliation(s)
- Irina A. Mironova
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - Dmitrii M. Noskov
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - Akira Yoshimura
- Faculty of Pharmaceutical Sciences, Aomori University, 2-3-1 Kobata, Aomori 030-0943, Japan
| | - Mekhman S. Yusubov
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - Viktor V. Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, MN 55812, USA
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7
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Kawakami R, Usui S, Tada N, Itoh A. Late-stage diversification strategy for synthesizing ynamides through copper-catalyzed diynylation and azide-alkyne cycloaddition. Chem Commun (Camb) 2023; 59:450-453. [PMID: 36519388 DOI: 10.1039/d2cc05575a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A late-stage diversification strategy for synthesizing ynamides has been developed. This strategy was enabled by the copper-catalyzed direct electrophilic diynylation of sulfonamides with a novel triisopropylsilyl diynyl benziodoxolone, deprotection, and the late-stage chemoselective copper-catalyzed azide-alkyne cycloaddition sequence, which yields various complex molecule-derived ynamides with pyrene, amino acid, nucleoside, and N-acetylglucosamine as substituents.
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Affiliation(s)
- Ryohei Kawakami
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Suguru Usui
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Norihiro Tada
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Akichika Itoh
- Laboratory of Pharmaceutical Synthetic Chemistry, Faculty of Pharmaceutical Science, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
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8
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Shimizu A, Shibata A, Kano T, Kumai Y, Kawakami R, Esaki H, Fukushima K, Tada N, Itoh A. Synthesis of 4-Imidazolidinones from Diamides and Ethynyl Benziodoxolones via Double Michael-Type Addition: Ethynyl Benziodoxolones as Electrophilic Ynol Synthons. Org Lett 2022; 24:8859-8863. [DOI: 10.1021/acs.orglett.2c03648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ayaka Shimizu
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Atsushi Shibata
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Takashi Kano
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Yuuichi Kumai
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Ryouhei Kawakami
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Hiroyoshi Esaki
- Hyogo Medical University, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan
| | - Kazuaki Fukushima
- Hyogo Medical University, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan
| | - Norihiro Tada
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Akichika Itoh
- Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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9
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Kikuchi J, Maesaki K, Sasaki S, Wang W, Ito S, Yoshikai N. Stereoselective Synthesis of β-Alkoxy-β-amido Vinylbenziodoxoles via Iodo(III)etherification of Ynamides. Org Lett 2022; 24:6914-6918. [PMID: 36125122 DOI: 10.1021/acs.orglett.2c02570] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A trans-iodo(III)etherification reaction of ynamides with benziodoxole triflate and alcohols is reported. Despite the sensitivity of ynamides and enamides toward Brønsted acid, the reaction could be successfully performed under carefully controlled conditions to afford β-alkoxy-β-amido vinylbenziodoxoles in moderate to good yields. The products could be subjected to a sequence of cross-coupling via C-I(III) bond cleavage and electrophilic halogenation of the resulting α-alkoxyenamides, allowing for the preparation of densely functionalized esters.
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Affiliation(s)
- Jun Kikuchi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kaito Maesaki
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Shuma Sasaki
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Weifan Wang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Shingo Ito
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Naohiko Yoshikai
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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10
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Li J, Zhou C, Liang H, Guo XQ, Chen LM, Kang TR. Direct One‐Pot Construction of Diaryl Thioethers and 1,3‐Diynes through a Copper(I)‐Catalyzed Reaction of λ3‐Iodanes with Thiophenols. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jun Li
- Chengdu University School of Pharmacy CHINA
| | - Chuang Zhou
- Chengdu University School of Food and Biological Engineering CHINA
| | - Hong Liang
- Chengdu University School of Pharmacy CHINA
| | | | - Lian-Mei Chen
- Chengdu University School of Food and Biological Engineering CHINA
| | - Tai-Ran Kang
- Chengdu University School of Food and Biological Engineering No 1, SHIDA ROAD 610106 Chengdu CHINA
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11
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He SD, Guo XQ, Li J, Zhang YC, Chen LM, Kang TR. Base‐Promoted Reaction of Phenols with Spirocylic λ3‐iodanes: Access to both 2‐Iodovinyl Aryl Ethers and Diaryl Ethers. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Shun-Dong He
- Chengdu University Sichuan Industrial Institute of Antibiotics, School of Pharmacy Chengdu CHINA
| | - Xiao-Qiang Guo
- Chengdu University Sichuan Industrial Institute of Antibiotics, School of Pharmacy CHINA
| | - Jun Li
- Chengdu University Sichuan Industrial Institute of Antibiotics, School of Pharmacy CHINA
| | - Yu-Cheng Zhang
- Chengdu University Sichuan Industrial Institute of Antibiotics, School of Pharmacy CHINA
| | - Lian-Mei Chen
- Chengdu University School of Food and Biological Engineering CHINA
| | - Tai-Ran Kang
- Chengdu University School of Food and Biological Engineering No 1, SHIDA ROAD 610106 Chengdu CHINA
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12
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Allouche EMD, Grinhagena E, Waser J. Hypervalent Iodine-Mediated Late-Stage Peptide and Protein Functionalization. Angew Chem Int Ed Engl 2022; 61:e202112287. [PMID: 34674359 PMCID: PMC9299824 DOI: 10.1002/anie.202112287] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Indexed: 12/20/2022]
Abstract
Hypervalent iodine compounds are powerful reagents for the development of novel transformations. As they exhibit low toxicity, high functional group tolerance, and stability in biocompatible media, they have been used for the functionalization of biomolecules. Herein, we report recent advances up to June 2021 in peptide and protein modification using hypervalent iodine reagents. Their use as group transfer or oxidizing reagents is discussed in this Minireview, including methods targeting polar, aromatic, or aliphatic amino acids and peptide termini.
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Affiliation(s)
- Emmanuelle M. D. Allouche
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC, LCSO, BCH 14021015LausanneSwitzerland
| | - Elija Grinhagena
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC, LCSO, BCH 14021015LausanneSwitzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC, LCSO, BCH 14021015LausanneSwitzerland
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13
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Allouche EMD, Grinhagena E, Waser J. Hypervalent Iodine‐Mediated Late‐Stage Peptide and Protein Functionalization. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202112287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Emmanuelle M. D. Allouche
- Laboratory of Catalysis and Organic Synthesis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC, LCSO, BCH 1402 1015 Lausanne Switzerland
| | - Elija Grinhagena
- Laboratory of Catalysis and Organic Synthesis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC, LCSO, BCH 1402 1015 Lausanne Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne, EPFL, SB ISIC, LCSO, BCH 1402 1015 Lausanne Switzerland
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14
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Wang CS, Tan PSL, Ding W, Ito S, Yoshikai N. Regio- and Stereoselective Synthesis of Enol Carboxylate, Phosphate, and Sulfonate Esters via Iodo(III)functionalization of Alkynes. Org Lett 2021; 24:430-434. [PMID: 34962817 DOI: 10.1021/acs.orglett.1c04123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
β-Iodo(III)enol carboxylates, phosphates, and tosylates can be efficiently synthesized through regio- and stereoselective iodo(III)functionalization of alkynes. The combination of chlorobenziodoxole and silver salt has proven to generate a versatile cationic iodine(III) electrophile to activate alkynes and engage various carboxylic acids, triethyl phosphate, and p-toluenesulfonic acid as nucleophiles. The β-iodo(III)enol esters serve as starting materials for the synthesis of multisubstituted alkenes through sequential cross-coupling of the C-I(III) and C-O bonds.
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Affiliation(s)
- Chang-Sheng Wang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Ploypailin Siew Ling Tan
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Wei Ding
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Shingo Ito
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Naohiko Yoshikai
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.,Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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15
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Chai J, Ding W, Wang C, Ito S, Wu J, Yoshikai N. Ritter-type iodo(iii)amidation of unactivated alkynes for the stereoselective synthesis of multisubstituted enamides. Chem Sci 2021; 12:15128-15133. [PMID: 34909154 PMCID: PMC8612402 DOI: 10.1039/d1sc05240c] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 10/26/2021] [Indexed: 01/24/2023] Open
Abstract
The Ritter reaction, Brønsted- or Lewis acid-mediated amidation of alkene or alcohol with nitrile via a carbocation, represents a classical method for the synthesis of tertiary amides. Although analogous reactions through a vinyl cation or a species alike may offer a route to enamide, an important synthetic building block as well as a common functionality in bioactive compounds, such transformations remain largely elusive. Herein, we report a Ritter-type trans-difunctionalization of alkynes with a trivalent iodine electrophile and nitrile, which affords β-iodanyl enamides in moderate to good yields. Mediated by benziodoxole triflate (BXT), the reaction proves applicable to a variety of internal alkynes as well as to various alkyl- and arylnitriles. The benziodoxole group in the product serves as a versatile handle for further transformations, thus allowing for the preparation of various tri- and tetrasubstituted enamides that are not readily accessible by other means.
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Affiliation(s)
- Jinkui Chai
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University Zhengzhou 450001 P. R. China .,Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
| | - Wei Ding
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore.,Division of Molecular Catalysis and Synthesis, Henan Institute of Advanced Technology, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Chen Wang
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemical Process, Shaoxing University Shaoxing 312000 P. R. China
| | - Shingo Ito
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
| | - Junliang Wu
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Naohiko Yoshikai
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore.,Graduate School of Pharmaceutical Sciences, Tohoku University 6-3 Aoba, Aramaki, Aoba-ku Sendai 980-8578 Japan
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