1
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Sar S, Ghorai P. Umpolung Chemo- and Regioselective Cascade Addition of Diethylzinc to α-Diketones Followed by Intramolecular Michael Reaction: Stereoselective Synthesis of Highly Substituted 1- Indanones. Org Lett 2022; 24:6576-6581. [PMID: 36069566 DOI: 10.1021/acs.orglett.2c02539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein we report an efficient stereoselective umpolung 1,2-addition of Et2Zn onto α-diketones followed by intramolecular cascade Michael cyclization. This strategy effectively delivers a broad range of substituted 1-indanones in excellent yields in a chemo- and regioselective fashion. Additionally, we performed a variety of synthetic transformations on the 1-indanone products. Furthermore, a hitherto-unexplored asymmetric variant of this methodology that provides up to 94:6 er using an easily accessible cinchona alkaloid ligand has been addressed.
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Affiliation(s)
- Suman Sar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal-462066, India
| | - Prasanta Ghorai
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal-462066, India
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2
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Verma V, Koperniku A, Edwards PM, Schafer LL. N-Silylamines in catalysis: synthesis and reactivity. Chem Commun (Camb) 2022; 58:9174-9189. [PMID: 35929426 DOI: 10.1039/d2cc02915d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A summary of the catalytic synthesis and reactivity of N-silylated amines is presented. Dehydrocoupling of amines with silanes, hydrosilylation of imines and dealkenylative coupling of amines with vinylsilanes are three ways to achieve their catalytic syntheses. The resultant N-silylamines serve as substrates in a variety of reactions, including C-N and C-C bond forming reactions, and are preferred in transformations because of the facile Si-N hydrolytic cleavage to reveal free amine products upon reaction completion. This review highlights the distinct electronic properties of N-silyl amines, N-silyl imines and N-silyl enamines that result in complementary reactivity to that of parent non-silyl variants.
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Affiliation(s)
- Vani Verma
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
| | - Ana Koperniku
- Faculty of Pharmaceutical Sciences, The University of British Columbia, 2405 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada
| | - Peter M Edwards
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
| | - Laurel L Schafer
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
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3
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Mizota I, Nakamura Y, Mizutani S, Mizukoshi N, Terasawa S, Shimizu M. Highly Selective Synthesis of α-Aminoamide Utilizing an Umpolung Reaction and Characteristics of α-Hydrazonoester. Org Lett 2021; 23:4168-4172. [PMID: 34014099 DOI: 10.1021/acs.orglett.1c01117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An umpolung reaction with α-hydrazonoesters was investigated, and it was found that α-N,N-dialkylaminoamides could be directly synthesized in yields up to 92% via a concomitant rearrangement of dialkylamino groups. As an application, a short synthesis of an inhibitor of glycine type-1-transporter was accomplished via subsequent functional group transformations in 28% overall yield.
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Affiliation(s)
- Isao Mizota
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Yusuke Nakamura
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Shunsuke Mizutani
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Nanami Mizukoshi
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Shunya Terasawa
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Makoto Shimizu
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan.,School of Energy Science and Engineering College, Nanjing Tech University, Nanjing, Jiangsu 211816, China
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4
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Shimizu M, Higashino A, Mizota I, Zhu Y. N-Alkylation/aldol reaction of α-aldimino thioesters: a facile three-component coupling reaction. RSC Adv 2021; 11:13097-13104. [PMID: 35423863 PMCID: PMC8697212 DOI: 10.1039/d1ra02000e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 03/31/2021] [Indexed: 11/29/2022] Open
Abstract
Theoretical calculation of the reactivity of α-imino thioesters indicates that they are very reactive substrates for Umpolung N-alkylation. In fact, treatment of α-aldimino thioesters with dialkylzinc reagents in the presence of aldehydes or imines gives three-component coupling products in good yields.
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Affiliation(s)
- Makoto Shimizu
- School of Energy Science and Engineering, Nanjing Tech University Nanjing 211816 Jiangsu Province China
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Asako Higashino
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Isao Mizota
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Yusong Zhu
- School of Energy Science and Engineering, Nanjing Tech University Nanjing 211816 Jiangsu Province China
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5
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Mizota I, Mori M, Shimizu M. Electrophilic amination reactions with
1
H
‐indazole
‐3‐carboxylates: Synthesis of amino acid frameworks and
3‐amino
‐2‐oxindoles. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Isao Mizota
- Department of Chemistry for Materials, Graduate School of EngineeringMie University Tsu Japan
| | - Mayuko Mori
- Department of Chemistry for Materials, Graduate School of EngineeringMie University Tsu Japan
| | - Makoto Shimizu
- Department of Chemistry for Materials, Graduate School of EngineeringMie University Tsu Japan
- School of Energy Science and EngineeringNanjing Tech University Nanjing China
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6
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Mizota I, Maeda M, Imoto K, Shimizu M. Synthesis of Tetramic Acid Derivatives via a Tandem Umpolung Alkylation/Reduction/Cyclization Reaction of γ-Hydrazono β-Ketoester. Org Lett 2020; 22:3079-3083. [PMID: 32227901 DOI: 10.1021/acs.orglett.0c00824] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient method for the one-pot synthesis of tetramic acid derivatives was developed utilizing tandem umpolung N-alkylation/reduction/cyclization of γ-hydrazono β-ketoester. By using this reaction as a key step, the total synthesis of the 3-spiro 7-hydroxamic acid tetralin which possesses an HDAC inhibitory activity was also achieved.
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Affiliation(s)
- Isao Mizota
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Miki Maeda
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Kiho Imoto
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - Makoto Shimizu
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan.,School of Energy Science and Engineering College, Nanjing Tech University, Nanjing 211816, Jiangsu Province, China
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7
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Shimizu M, Morimoto T, Yanagi Y, Mizota I, Zhu Y. An umpolung reaction of α-iminothioesters possessing a cyclopropyl group. RSC Adv 2020; 10:9955-9963. [PMID: 35498585 PMCID: PMC9050218 DOI: 10.1039/d0ra01152e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 03/03/2020] [Indexed: 12/30/2022] Open
Abstract
An umpolung N-alkylation reaction of α-cyclopropyl α-iminothioesters with diethylaluminum chloride or ethylmagnesium bromide affords the corresponding N-ethylated α-aminothioesters in good yields. Subsequent oxidation and reaction of the N-ethylated product with a thiolate or a chloride anion proceed effectively to give the ring-opened products in good yields. In contrast, relatively “hard” nucleophiles did not give the ring-opened products but gave the addition products to the iminium carbon. Tandem N-alkylation/oxidation/second addition reaction to α-cyclopropyl α-imino(thio)esters gave N-alkylated ring-opened products in good yields.![]()
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Affiliation(s)
- Makoto Shimizu
- School of Energy Science and Engineering
- Nanjing Tech University
- Nanjing 211816
- China
- Department of Chemistry for Materials
| | - Takayoshi Morimoto
- Department of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Tsu
- Japan
| | - Yusuke Yanagi
- Department of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Tsu
- Japan
| | - Isao Mizota
- Department of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Tsu
- Japan
| | - Yusong Zhu
- School of Energy Science and Engineering
- Nanjing Tech University
- Nanjing 211816
- China
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8
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Shimizu M, Furukawa Y, Mizota I, Zhu Y. An umpolung reaction of α-iminonitriles and its application to the synthesis of aminomalononitriles. NEW J CHEM 2020. [DOI: 10.1039/c9nj05114g] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An umpolungN-alkylation reaction of α-iminonitriles with Grignard reagents gaveN-alkylated α-aminonitriles in good yields.
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Affiliation(s)
- Makoto Shimizu
- School of Energy Science and Engineering
- Nanjing Tech University
- Nanjing 211816
- China
- Department of Chemistry for Materials
| | - Yuki Furukawa
- Department of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Tsu
- Japan
| | - Isao Mizota
- Department of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Tsu
- Japan
| | - Yusong Zhu
- School of Energy Science and Engineering
- Nanjing Tech University
- Nanjing 211816
- China
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9
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Li Q, Persoons L, Daelemans D, Herdewijn P. Iron/Copper Co-Catalyzed Cross-Coupling Reaction for the Synthesis of 6-Substituted 7-Deazapurines and the Corresponding Nucleosides. J Org Chem 2019; 85:403-418. [DOI: 10.1021/acs.joc.9b02414] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Qingfeng Li
- KU Leuven, Rega Institute for Medical Research, Medicinal Chemistry, Herestraat 49-bus 1041, 3000 Leuven, Belgium
| | - Leentje Persoons
- KU Leuven Department of Microbiology, Immunology and Transplantation, Laboratory of Virology and Chemotherapy, Rega Institute for Medical Research, KU Leuven, Herestraat 49-bus 1043, 3000 Leuven, Belgium
| | - Dirk Daelemans
- KU Leuven Department of Microbiology, Immunology and Transplantation, Laboratory of Virology and Chemotherapy, Rega Institute for Medical Research, KU Leuven, Herestraat 49-bus 1043, 3000 Leuven, Belgium
| | - Piet Herdewijn
- KU Leuven, Rega Institute for Medical Research, Medicinal Chemistry, Herestraat 49-bus 1041, 3000 Leuven, Belgium
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10
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Roscales S, Csáky AG. Transition‐Metal‐Free Three‐Component Synthesis of Tertiary Aryl Amines from Nitro Compounds, Boronic Acids, and Trialkyl Phosphites. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Silvia Roscales
- Instituto PluridisciplinarUniversidad Complutense de Madrid Paseo de Juan XXIII, 1 28040 Madrid Spain
| | - Aurelio G. Csáky
- Instituto PluridisciplinarUniversidad Complutense de Madrid Paseo de Juan XXIII, 1 28040 Madrid Spain
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11
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Shimizu M, Mushika M, Mizota I, Zhu Y. Double nucleophilic addition to iminomalonate, leading to the synthesis of quaternary α-amino diesters and desymmetrization of the products. RSC Adv 2019; 9:23400-23407. [PMID: 35514493 PMCID: PMC9067299 DOI: 10.1039/c9ra04889h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 07/22/2019] [Indexed: 01/24/2023] Open
Abstract
Alkylation of iminomalonate with Grignard reagents followed by oxidation and allylation gave symmetrical quaternary α-amino diesters in good yields. Subsequent desymmetrization of a diol derivative from these products was conducted via asymmetric carbamylation catalyzed by Cu-Bnbox to give chiral quaternary aminodiol mono-carbamates.
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Affiliation(s)
- Makoto Shimizu
- School of Energy Science and Engineering, Nanjing Tech University Nanjing 211816 Jiangsu Province China
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Miki Mushika
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Isao Mizota
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Yusong Zhu
- School of Energy Science and Engineering, Nanjing Tech University Nanjing 211816 Jiangsu Province China
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