1
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Milzarek TM, Ramirez NP, Liu XY, Waser J. One-pot synthesis of functionalized bis(trifluoromethylated)benziodoxoles from iodine(I) precursors. Chem Commun (Camb) 2023; 59:12637-12640. [PMID: 37791867 DOI: 10.1039/d3cc04525k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Bis(trifluoromethylated)benziodoxoles (Bx) are broadly used cyclic hypervalent iodine reagents due to their stability and unique chemical properties. However, current methods to access them require several steps and long reaction times, making their synthesis tedious. Herein, a direct one-pot synthesis of bis(trifluoromethylated) Bx reagents from iodine(I) precursors is reported, enabling the synthesis of functionalized reagents.
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Affiliation(s)
- Tobias M Milzarek
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - Nieves P Ramirez
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - Xing-Yu Liu
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
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2
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Lee HJ, Maruoka K. Recent Asymmetric Phase-Transfer Catalysis with Chiral Binaphthyl-Modified and Related Phase-Transfer Catalysts over the Last 10 Years. CHEM REC 2023:e202200286. [PMID: 36850022 DOI: 10.1002/tcr.202200286] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/14/2023] [Indexed: 03/01/2023]
Abstract
In this personal account, we describe our recent advances in the three types of phase-transfer catalysis for various transformations including asymmetric induction: Firstly, asymmetric phase-transfer catalysis with Maruoka-type C2 -symmetric chiral biaryl-modified tetraalkylammonium salts and phosphonium salts; Secondly, asymmetric phase-transfer catalysis under base-free and neutral conditions; Thirdly, hydrogen-bonding catalysis using tetraalkylammonium and trialkylsulfonium salts. These three different strategies are illustrated by using various phase-transfer catalyzed transformations.
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Affiliation(s)
- Hyo-Jun Lee
- Department of Chemistry, Kunsan National University, Gunsan, 54150, Republic of Korea
| | - Keiji Maruoka
- Graduate School of Pharmaceutical Sciences, Kyoto University Sakyo, Kyoto, 606-8501, Japan.,School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China
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3
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Chu LF, Yao Y, Lu CD. Stereoselective Electrophilic α-Alkynylation of α,α-Disubstituted N- tert-Butanesulfinyl Ketimines for Construction of Less Accessible Acyclic Quaternary Stereocenters. Org Lett 2022; 24:9135-9140. [DOI: 10.1021/acs.orglett.2c03865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Li-Feng Chu
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
| | - Yun Yao
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
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4
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Hassaballah AI, Ramadan SK, Rizk SA, El-Helw EAE, Abdelwahab SS. Ultrasonic Promoted Regioselective Reactions of the Novel Spiro 3,1-Benzoxazon-Isobenzofuranone Dye Toward Some Organic Base Reagents. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2061021] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Aya I. Hassaballah
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Sayed K. Ramadan
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Sameh A. Rizk
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Eman A. E. El-Helw
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
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5
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Cheng HL, Xie XH, Chen JZ, Wang Z, Chen JP. An in situ masking strategy enables radical monodecarboxylative C-C bond coupling of malonic acid derivatives. Chem Sci 2021; 12:11786-11792. [PMID: 34659716 PMCID: PMC8442682 DOI: 10.1039/d1sc02642a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 08/02/2021] [Indexed: 11/28/2022] Open
Abstract
The utilization of malonic acids in radical decarboxylative functionalization is still underexploited, and the few existing examples are primarily limited to bisdecarboxylative functionalization. While radical monodecarboxylative functionalization is highly desirable, it is challenging because of the difficulty in suppressing the second radical decarboxylation step. Herein, we report the successful radical monodecarboxylative C–C bond coupling of malonic acids with ethynylbenziodoxolone (EBX) reagents enabled by an in situ masking strategy, affording synthetically useful 2(3H)-furanones in satisfactory yields. The keys to the success of this transformation include (1) the dual role of a silver catalyst as a single-electron transfer catalyst to drive the radical decarboxylative alkynylation and as a Lewis acid catalyst to promote the 5-endo-dig cyclization and (2) the dual function of the alkynyl reagent as a radical trapper and as an in situ masking group. Notably, the latent carboxylate group in the furanones could be readily released, which could serve as a versatile synthetic handle for further elaborations. Thus, both carboxylic acid groups in malonic acid derivatives have been well utilized for the rapid construction of molecular complexity. An in situ masking strategy has been developed based upon the unique properties of silver catalysts to successfully achieve a radical monodecarboxylative C–C bond coupling of malonic acids with ethynylbenziodoxolone reagents.![]()
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Affiliation(s)
- He-Li Cheng
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 211816 China
| | - Xian-Hui Xie
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 211816 China
| | - Jia-Zheng Chen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 211816 China
| | - Zhen Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 211816 China
| | - Jian-Ping Chen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 211816 China
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6
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Ramirez NP, Pisella G, Waser J. Cu(I)-Catalyzed gem-Aminoalkynylation of Diazo Compounds: Synthesis of Fluorinated Propargylic Amines. J Org Chem 2021; 86:10928-10938. [PMID: 34260244 DOI: 10.1021/acs.joc.1c01423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The gem-aminoalkynylation of fluorinated diazo compounds catalyzed by a simple Cu(I) salt is described. This three-component reaction allows the synthesis of propargylic amines with broad functional group tolerance. Both electron-rich and electron-poor anilines can be used as nucleophiles and alkyl-, aryl-, and silyl-substituted EthynylBenziodoXoles (EBX) as electrophiles.
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Affiliation(s)
- Nieves P Ramirez
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Guillaume Pisella
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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7
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Meng B, Shi Q, Meng Y, Chen J, Cao W, Wu X. Asymmetric catalytic alkynylation of thiazolones and azlactones for synthesis of quaternary α-amino acid precursors. Org Biomol Chem 2021; 19:5087-5092. [PMID: 34037046 DOI: 10.1039/d1ob00582k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Asymmetric alkynylation of thiazolones and azlactones with alkynylbenziodoxolones as the electrophilic alkyne source catalyzed by thiourea phosphonium salt is described. By using thiazolones as nucleophiles, the desired alkyne functionalized thiazolones were obtained in 55-89% yields with 31-86% ee. Azlactones gave the desired products in comparable yields with lower enantioselectivities. Ring-opening of the alkynylation products led to α,α-disubstituted α-amino acid derivatives efficiently without loss of enantioselectivity.
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Affiliation(s)
- Beibei Meng
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences, Shanghai University, 99 Shangda Lu, Shanghai 200444, People's Republic of China.
| | - Qian Shi
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences, Shanghai University, 99 Shangda Lu, Shanghai 200444, People's Republic of China.
| | - Yuan Meng
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences, Shanghai University, 99 Shangda Lu, Shanghai 200444, People's Republic of China.
| | - Jie Chen
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences, Shanghai University, 99 Shangda Lu, Shanghai 200444, People's Republic of China.
| | - Weiguo Cao
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences, Shanghai University, 99 Shangda Lu, Shanghai 200444, People's Republic of China.
| | - Xiaoyu Wu
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences, Shanghai University, 99 Shangda Lu, Shanghai 200444, People's Republic of China.
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8
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Tian MQ, Shen ZY, Zhao X, Walsh PJ, Hu XH. Iron-Catalyzed Tertiary Alkylation of Terminal Alkynes with 1,3-Diesters via a Functionalized Alkyl Radical. Angew Chem Int Ed Engl 2021; 60:9706-9711. [PMID: 33590589 DOI: 10.1002/anie.202100641] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/07/2021] [Indexed: 11/11/2022]
Abstract
Direct oxidative C(sp)-H/C(sp3 )-H cross-coupling offers an ideal and environmentally benign protocol for C(sp)-C(sp3 ) bond formations. As such, reactivity and site-selectivity with respect to C(sp3 )-H bond cleavage have remained a persistent challenge. Herein is reported a simple method for iron-catalyzed/silver-mediated tertiary alkylation of terminal alkynes with readily available and versatile 1,3-dicarbonyl compounds. The reaction is suitable for an array of substrates and proceeds in a highly selective manner even employing alkanes containing other tertiary, benzylic, and C(sp3 )-H bonds alpha to heteroatoms. Elaboration of the products enables the synthesis of a series of versatile building blocks. Control experiments implicate the in situ generation of a tertiary carbon-centered radical species.
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Affiliation(s)
- Ming-Qing Tian
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Zhen-Yao Shen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Xuefei Zhao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Patrick J Walsh
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA, 19104, USA
| | - Xu-Hong Hu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
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9
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Tian M, Shen Z, Zhao X, Walsh PJ, Hu X. Iron‐Catalyzed Tertiary Alkylation of Terminal Alkynes with 1,3‐Diesters via a Functionalized Alkyl Radical. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ming‐Qing Tian
- Institute of Advanced Synthesis School of Chemistry and Molecular Engineering Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Zhen‐Yao Shen
- Institute of Advanced Synthesis School of Chemistry and Molecular Engineering Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Xuefei Zhao
- Institute of Advanced Synthesis School of Chemistry and Molecular Engineering Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories Penn/Merck Laboratory for High-Throughput Experimentation Department of Chemistry University of Pennsylvania 231 South 34th Street Philadelphia PA 19104 USA
| | - Xu‐Hong Hu
- Institute of Advanced Synthesis School of Chemistry and Molecular Engineering Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
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10
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Stockhammer L, Schörgenhumer J, Mairhofer C, Waser M. Asymmetric α-Chlorination of β-Keto Esters Using Hypervalent Iodine-Based Cl-Transfer Reagents in Combination with Cinchona Alkaloid Catalysts. European J Org Chem 2021; 2021:82-86. [PMID: 33519300 PMCID: PMC7821243 DOI: 10.1002/ejoc.202001217] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Indexed: 01/29/2023]
Abstract
We herein report an unprecedented strategy for the asymmetric α-chlorination of β-keto esters with hypervalent iodine-based Cl-transfer reagents using simple Cinchona alkaloid catalysts. Our investigations support an α-chlorination mechanism where the Cinchona species serves as a nucleophilic catalyst by reacting with the chlorinating agent to generate a chiral electrophilic Cl-transfer reagent in situ. Using at least 20 mol-% of the alkaloid catalyst allows for good yields and enantioselectivities for a variety of different β-keto esters under operationally simple conditions.
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Affiliation(s)
- Lotte Stockhammer
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Johannes Schörgenhumer
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Christopher Mairhofer
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Mario Waser
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
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11
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Zeni G, Godoi B, Jurinic CK, Belladona AL, Schumacher RF. Transition Metal-Free Synthesis of Carbo- and Heterocycles via Reaction of Alkynes with Organylchalcogenides. CHEM REC 2021; 21:2880-2895. [PMID: 33394571 DOI: 10.1002/tcr.202000152] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/18/2020] [Accepted: 12/21/2020] [Indexed: 11/09/2022]
Abstract
This manuscript intends to overview the most recent advances in the synthesis of carbo- and heterocycles through reactions of alkynes with organyl chalcogenides (S, Se, Te) under metal-free conditions. Firstly, the use of electrophilic chalcogenyl halides as a selective reagent for alkyne carbon-carbon triple bond activation will be presented. After that, radical cyclization protocols employing electrochemical oxidative conditions, light-induced photoredox catalysis, or mild oxidants with direct chalcogenyl group installation will be discussed accompanied by the proposed mechanisms.
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Affiliation(s)
- Gilson Zeni
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil, 97105-900
| | - Benhur Godoi
- Programa de Pós-graduação em Ambiente e Tecnologias Sustentáveis - PPGATS, Federal University of Fronteira Sul, Brazil, RS, 97900-000
| | - Carla K Jurinic
- Programa de Pós-graduação em Ambiente e Tecnologias Sustentáveis - PPGATS, Federal University of Fronteira Sul, Brazil, RS, 97900-000
| | - Andrei L Belladona
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil, 97105-900
| | - Ricardo F Schumacher
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil, 97105-900
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12
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Abstract
Asymmetric organocatalytic oxidations have been witnessed to an impressive development in the last years thanks to the establishment of important chiral hypervalent iodines(III/V). Many different approaches involving both stoichiometric and catalytic versions have provided a fundamental advance in this area within asymmetric synthesis. The easily handing, nontoxic, mild, environmentally friendly (green oxidants), and high stability that are features of these reagents have been applied to many reactions and also have allowed exploring further unprecedented enantioselective transformations. The intention of the present review is thus to highlight as a whole the many approaches utilized up to date to prepare chiral iodines(III/V), as well as their reactivity in a comprehensive manner.
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Affiliation(s)
- Alejandro Parra
- Facultad de Ciencias, Departamento de Química Orgánica, Institute for Advance Research in Chemical Sciences (IAdChem) Universidad Autónoma de Madrid , 28049 Madrid , Spain
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13
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Teodoro BVM, Silva LF. Sequential Michael Addition/Electrophilic Alkynylation: Synthesis of α-Alkynyl-β-Substituted Ketones and Chromanones. J Org Chem 2018; 83:13604-13611. [PMID: 30284445 DOI: 10.1021/acs.joc.8b02251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the synthesis of α-alkynyl-β-substituted cyclic ketones and analogue chromanones via one-pot Michael addition/hypervalent iodine-based α-alkynylation. Cu(I)-catalyzed Michael addition using either alkyl-aluminum or Grignard reagents, followed by diastereoselective electrophilic alkynylation of the resulting enolate by 1-ethynyl-1λ3,2-benziodoxol-3(1H)-one (EBX) resulted in the α-alkynyl-β-substituted cyclic ketones or chromanones within 34-89% yield (16 examples). The reaction was successfully upscaled to the 5 mmol scale, and further functionalization of a model alkynylated ketone was demonstrated.
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Affiliation(s)
- Bruno V M Teodoro
- Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , São Paulo 05508-000 , Brazil
| | - Luiz F Silva
- Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , São Paulo 05508-000 , Brazil
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14
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Chen ZC, Chen P, Chen Z, Ouyang Q, Liang HP, Du W, Chen YC. Organocatalytic Enantioselective 1,3-Difunctionalizations of Morita–Baylis–Hillman Carbonates. Org Lett 2018; 20:6279-6283. [PMID: 30256122 DOI: 10.1021/acs.orglett.8b02764] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhi-Chao Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Peng Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Zhi Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Qin Ouyang
- State Key Laboratory of Trauma, Burn and Combined Injury, and College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
| | - Hua-Ping Liang
- State Key Laboratory of Trauma, Burn and Combined Injury, and College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
| | - Wei Du
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying-Chun Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
- State Key Laboratory of Trauma, Burn and Combined Injury, and College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
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15
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El-Hashash MA, Rizk SA, El-Badawy AA. Ultrasonic Aptitude of Regioselective Reaction of 6-bromo-spiro-3,1-benzoxazinone2,1′-isobenzofuran-3′,4-dione Towards Some Electrophilic and Nucleophilic Reagents. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3250] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Maher A. El-Hashash
- Department of Chemistry, Faculty of Science; Ain Shams University; Cairo 11566 Egypt
| | - Sameh A. Rizk
- Department of Chemistry, Faculty of Science; Ain Shams University; Cairo 11566 Egypt
| | - Azza A. El-Badawy
- Department of Chemistry, Faculty of Science; Ain Shams University; Cairo 11566 Egypt
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16
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Ghosh S, Pradhan S, Chatterjee I. A survey of chiral hypervalent iodine reagents in asymmetric synthesis. Beilstein J Org Chem 2018; 14:1244-1262. [PMID: 29977393 PMCID: PMC6009198 DOI: 10.3762/bjoc.14.107] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 05/02/2018] [Indexed: 12/15/2022] Open
Abstract
The recent years have witnessed a remarkable growth in the area of chiral hypervalent iodine chemistry. These environmentally friendly, mild and economic reagents have been used in catalytic or stoichiometric amounts as an alternative to transition metals for delivering enantioenriched molecules. Varieties of different chiral reagents and their use for demanding asymmetric transformations have been documented over the last 25 years. This review highlights the contribution of different chiral hypervalent iodine reagents in diverse asymmetric conversions.
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Affiliation(s)
- Soumen Ghosh
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India
| | - Suman Pradhan
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India
| | - Indranil Chatterjee
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India
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17
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Tiffner M, Stockhammer L, Schörgenhumer J, Röser K, Waser M. Towards an Asymmetric Organocatalytic α-Azidation of β-Ketoesters. Molecules 2018; 23:molecules23051142. [PMID: 29751597 PMCID: PMC6100502 DOI: 10.3390/molecules23051142] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/04/2018] [Accepted: 05/10/2018] [Indexed: 12/11/2022] Open
Abstract
Detailed investigations concerning the organocatalytic (asymmetric) α-azidation of prochiral β-ketoesters were carried out. It was shown that the racemic version of such a reaction can either be carried out under oxidative conditions using TMSN3 as the azide-source with quaternary ammonium iodides as the catalysts, or by using hypervalent iodine-based electrophilic azide-transfer reagents with different organocatalysts. In addition, the latter strategy could also be carried out with modest enantioselectivities when using simple cinchona alkaloid catalysts, albeit with relatively low yields.
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Affiliation(s)
- Maximilian Tiffner
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria.
| | - Lotte Stockhammer
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria.
| | - Johannes Schörgenhumer
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria.
| | - Katharina Röser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria.
| | - Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria.
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18
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Hu XY, Hu FZ, Chen H, Xu XY, Yuan WC, Zhang XM. Enantioselective α-Arylation of Cyclic β-Ketoamides with a Quinone Monoimine. ChemistrySelect 2018. [DOI: 10.1002/slct.201800085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Xiao-Yan Hu
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province; Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 China
- Henan University of Science and Technology; Luoyang 471023 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Fang-Zhi Hu
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province; Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Hui Chen
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province; Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xiao-Ying Xu
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province; Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 China
| | - Wei-Cheng Yuan
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province; Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 China
| | - Xiao-Mei Zhang
- Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province; Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 China
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19
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Peng S, Wang Z, Zhang L, Zhang X, Huang Y. Streamlined asymmetric α-difunctionalization of ynones. Nat Commun 2018; 9:375. [PMID: 29371601 PMCID: PMC5785506 DOI: 10.1038/s41467-017-02801-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 12/28/2017] [Indexed: 01/01/2023] Open
Abstract
Ynones are a unique class of structural motifs that show remarkable chemical versatility. Chiral ynones, particularly those possessing an α-stereogenic center, are highly attractive templates for structural diversification. So far, only very limited examples have been reported for asymmetric α-functionalization of ynones. Asymmetric double α-functionalization of ynones remains elusive. Here we describe a streamlined strategy for asymmetric α-difunctionalization of ynones. We developed a gold-catalyzed multicomponent condensation reaction from a simple ynone, an amine, and an electrophilic alkynylating reagent to generate a 1,2-dialkynyl enamine, a key stable and isolable intermediate. This intermediate can undergo asymmetric fluorination catalyzed by a chiral phosphoric acid derivative. Chiral ynones with an α-quaternary carbon and containing a fluorine and an alkyne can be synthesized in high yield and high ee. The synthetic utility of this method is demonstrated by the synthesis of enantioenriched tri(hetero)arylmethyl fluorides. Chiral ynones with an α-quaternary carbon are attractive synthetic building blocks for natural and pharmaceutical products. Here, the authors report an asymmetric α-difunctionalization of simple ynones, involving a gold-catalyzed step and yielding enantioenriched fluorinated quaternary stereocentres.
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Affiliation(s)
- Siyu Peng
- Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, 518055, Shenzhen, China
| | - Zhaofeng Wang
- Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, 518055, Shenzhen, China
| | - Linxing Zhang
- Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, 518055, Shenzhen, China
| | - Xinhao Zhang
- Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, 518055, Shenzhen, China
| | - Yong Huang
- Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, 518055, Shenzhen, China.
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20
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Roy A, Das MK, Chaudhuri S, Bisai A. Transition-Metal Free Oxidative Alkynylation of 2-Oxindoles with Ethynylbenziodoxolone (EBX) Reagents. J Org Chem 2017; 83:403-421. [DOI: 10.1021/acs.joc.7b02797] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Avishek Roy
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhopal, MP 462 066, India
| | - Mrinal Kanti Das
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhopal, MP 462 066, India
| | - Saikat Chaudhuri
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhopal, MP 462 066, India
| | - Alakesh Bisai
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass
Road, Bhopal, MP 462 066, India
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21
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Shen K, Wang Q. Copper-catalyzed aminoalkynylation of alkenes with hypervalent iodine reagents. Chem Sci 2017; 8:8265-8270. [PMID: 29568474 PMCID: PMC5857935 DOI: 10.1039/c7sc03420b] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Accepted: 10/15/2017] [Indexed: 12/30/2022] Open
Abstract
A copper-catalyzed aminoalkynylation of alkenes is achieved with ethynylbenziodoxolone (EBX) reagents under mild conditions with only 1 mol% copper catalyst. This transformation allows for rapid construction of diverse important azahetereocycles and installation of valuable alkyne groups in one step. The developed method features remarkable substrate scope for both terminal and internal alkenes as well as different alkynyl groups, presenting great potential for broad applications in synthesis, bioconjugation, and molecular imaging.
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Affiliation(s)
- Kun Shen
- Department of Chemistry , Duke University , Durham , NC 27708-0346 , USA .
| | - Qiu Wang
- Department of Chemistry , Duke University , Durham , NC 27708-0346 , USA .
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22
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Wang D, Zhang L, Luo S. Enantioselective Decarboxylative α-Alkynylation of β-Ketocarbonyls via a Catalytic α-Imino Radical Intermediate. Org Lett 2017; 19:4924-4927. [PMID: 28876945 DOI: 10.1021/acs.orglett.7b02386] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A distinctive aminocatalysis via α-imino radical is reported on the basis of SET oxidation of a secondary enamine. The combination of chiral primary amine catalysis and visible-light photoredox catalysis enables the enantioselective decarboxylative coupling of propiolic acid and β-ketocarbonyls to afford alkynylation adducts with high enantioselectivity. Mechanism studies indicate the reaction proceeds via an α-imino radical addition.
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Affiliation(s)
- Dehong Wang
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.,University of Chinese Academy of Sciences , Beijing 100490, China
| | - Long Zhang
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.,University of Chinese Academy of Sciences , Beijing 100490, China.,Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071, China
| | - Sanzhong Luo
- Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.,University of Chinese Academy of Sciences , Beijing 100490, China.,Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071, China
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23
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Teodoro BVM, Silva LF. Metal-Free Synthesis of Homopropargylic Alcohols from Aldehydes. J Org Chem 2017; 82:11787-11791. [DOI: 10.1021/acs.joc.7b01629] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruno V. M. Teodoro
- Departamento de
Química
Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP 05508-000, Brazil
| | - Luiz F. Silva
- Departamento de
Química
Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP 05508-000, Brazil
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24
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Companys S, Peixoto PA, Bosset C, Chassaing S, Miqueu K, Sotiropoulos JM, Pouységu L, Quideau S. Asymmetric Alkynylation of β-Ketoesters and Naphthols Promoted by New Chiral Biphenylic Iodanes. Chemistry 2017; 23:13309-13313. [DOI: 10.1002/chem.201703238] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Simon Companys
- Univ. Bordeaux; ISM (CNRS-UMR 5255); 351 cours de la Libération, 3 3405 Talence Cedex France
| | - Philippe A. Peixoto
- Univ. Bordeaux; ISM (CNRS-UMR 5255); 351 cours de la Libération, 3 3405 Talence Cedex France
| | - Cyril Bosset
- Univ. Bordeaux; ISM (CNRS-UMR 5255); 351 cours de la Libération, 3 3405 Talence Cedex France
| | | | - Karinne Miqueu
- Univ. Pau et Pays de l'Adour; IPREM (CNRS-UMR 5254), Hélioparc; 2 avenue Pierre Angot 64053 Pau Cedex 09 France
| | - Jean-Marc Sotiropoulos
- Univ. Pau et Pays de l'Adour; IPREM (CNRS-UMR 5254), Hélioparc; 2 avenue Pierre Angot 64053 Pau Cedex 09 France
| | - Laurent Pouységu
- Univ. Bordeaux; ISM (CNRS-UMR 5255); 351 cours de la Libération, 3 3405 Talence Cedex France
| | - Stéphane Quideau
- Univ. Bordeaux; ISM (CNRS-UMR 5255); 351 cours de la Libération, 3 3405 Talence Cedex France
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25
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Wu J, Xu K, Hirao H, Yoshikai N. Pd-Catalyzed, Ligand-Enabled Stereoselective 1,2-Iodine(III) Shift/1,1-Carboxyalkynylation of Alkynylbenziodoxoles. Chemistry 2017; 23:1521-1525. [PMID: 27966272 DOI: 10.1002/chem.201605772] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Indexed: 12/20/2022]
Abstract
A PdII -catalyzed 2:1 coupling reaction of alkynylbenziodoxole with carboxylic acid to afford (alk-1-en-3-ynyl)benziodoxole, which is efficiently promoted by an octahydrophenazine ligand, is reported. The reaction involves a Pd-assisted 1,2-iodine(III) shift of the alkynylbenziodoxole followed by stereoselective introduction of carboxy and alkynyl groups (the latter originating from another molecule of the alkynylbenziodoxole) into the 1-position of the transient Pd-vinylidene species. The product of this 1,1-carboxyalkynylation reaction serves as a new functionalized enyne-type building block for further synthetic transformations.
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Affiliation(s)
- Junliang Wu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Kai Xu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Hajime Hirao
- 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
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26
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Guo J, Lin L, Liu Y, Li X, Liu X, Feng X. Nickel(II)-Catalyzed Enantioselective α-Vinylation of β-Keto Amides/Esters with Hypervalent Iodine Salts. Org Lett 2016; 18:5540-5543. [PMID: 27779414 DOI: 10.1021/acs.orglett.6b02785] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The enantioselective α-vinylation of β-keto amides/esters using hypervalent iodine salts has been accomplished via a chiral N,N'-dioxide-nickel(II) complex promoted electrophilic addition and reductive elimination process. A wide range of vinyl-substituted all-carbon quaternary β-keto amides/esters were obtained in high yields and ee values (up to 99% yield and 99% ee). Moreover, the catalytic system has been applied to the enantioselective alkynylation/arylation of β-ketoamides with good results.
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Affiliation(s)
- Jing Guo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Yangbin Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Xiangqiang Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
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27
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Catalytic asymmetric synthesis of axially chiral 2-amino-1,1′-biaryl compounds by phase-transfer-catalyzed kinetic resolution and desymmetrization. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.10.074] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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28
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Li Y, Hari DP, Vita MV, Waser J. Cyclic Hypervalent Iodine Reagents for Atom-Transfer Reactions: Beyond Trifluoromethylation. Angew Chem Int Ed Engl 2016; 55:4436-54. [DOI: 10.1002/anie.201509073] [Citation(s) in RCA: 272] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Yifan Li
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Switzerland
| | - Durga Prasad Hari
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Switzerland
| | - Maria Victoria Vita
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Switzerland
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29
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Li Y, Hari DP, Vita MV, Waser J. Cyclische hypervalente Iodreagentien für Atomtransferreaktionen - jenseits der Trifluormethylierung. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201509073] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Yifan Li
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Schweiz
| | - Durga Prasad Hari
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Schweiz
| | - Maria Victoria Vita
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Schweiz
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis; Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO; BCH 4306 1015 Lausanne CH Schweiz
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30
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Cui FH, Su SX, Xu YL, Liang Y, Wang HS, Pan YM. Capture of CO2 in air for 4,5-disubstituted furan-2(5H)-ones. Org Chem Front 2016. [DOI: 10.1039/c6qo00328a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A sustainable strategy for the assembly of 4,5-disubstituted furan-2(5H)-ones directly from carbon dioxide from air was developed.
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Affiliation(s)
- Fei-Hu Cui
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
- School of Life and Environmental Sciences
| | - Shi-Xia Su
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Yan-li Xu
- College of Pharmacy
- Guilin Medical University
- Guilin
- People's Republic of China
| | - Ying Liang
- School of Life and Environmental Sciences
- Guilin University of Electronic Technology
- Guilin
- People's Republic of China
| | - Heng-shan Wang
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Ying-Ming Pan
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
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31
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Tatsumi T, Misaki T, Sugimura T. Organocatalytic 1,4-Addition Reaction of 2-Formyl(thio)esters to Vinylketones: An Efficient Access to Acyclic Chiral Building Blocks with a Quaternary Carbon Stereocenter. Chemistry 2015; 21:18971-4. [PMID: 26555679 DOI: 10.1002/chem.201504479] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 11/05/2022]
Abstract
2-Formyl(thio)esters were utilized as pronucleophiles to obtain less-accessible acyclic chiral building blocks bearing versatile functional groups on a quaternary carbon atom for enantioselective 1,4-addition to vinylketones. To achieve high enantioselectivity in the present 1,4-addition reaction, thiourea-tertiary amines containing a bulky chiral backbone were developed as catalysts, and several derivatizations of the products were performed to demonstrate the synthetic utility of the products.
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Affiliation(s)
- Toshifumi Tatsumi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo 678-1297 (Japan)
| | - Tomonori Misaki
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo 678-1297 (Japan).
| | - Takashi Sugimura
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo 678-1297 (Japan)
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32
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Wu J, Yoshikai N. Modular Synthesis of Multisubstituted Furans through Palladium-Catalyzed Three-Component Condensation of Alkynylbenziodoxoles, Carboxylic Acids, and Imines. Angew Chem Int Ed Engl 2015; 54:11107-11. [DOI: 10.1002/anie.201504687] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Indexed: 01/16/2023]
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33
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Wu J, Yoshikai N. Modular Synthesis of Multisubstituted Furans through Palladium-Catalyzed Three-Component Condensation of Alkynylbenziodoxoles, Carboxylic Acids, and Imines. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504687] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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34
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Cao D, Zhang J, Wang H, Zhao G. Dipeptide-Derived Multifunctional Quaternary Phosphonium Salt Catalyzed Asymmetric Cyclizations via a Tandem Michael Addition/SN2 Sequence. Chemistry 2015; 21:9998-10002. [DOI: 10.1002/chem.201501806] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Indexed: 12/17/2022]
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35
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Towards an asymmetric organocatalytic α-cyanation of β-ketoesters. Tetrahedron Lett 2015; 56:1911-1914. [PMID: 25843983 PMCID: PMC4366011 DOI: 10.1016/j.tetlet.2015.02.116] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 02/17/2015] [Accepted: 02/20/2015] [Indexed: 02/07/2023]
Abstract
This communication describes the first proof of concept for an asymmetric α-cyanation of β-ketoesters using a hypervalent iodine-based electrophilic cyanide-transfer reagent. A series of different organocatalysts has been investigated and it was found that the use of naturally occurring Cinchona alkaloids allows obtaining the target products in good yields and with moderate enantioselectivities up to er = 76:24 under operationally simple conditions.
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36
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Abstract
Alkynes are among the most versatile functional groups in organic synthesis. They are also frequently used in chemical biology and materials science. Whereas alkynes are traditionally added as nucleophiles into organic molecules, hypervalent iodine reagents offer a unique opportunity for the development of electrophilic alkyne synthons. Since 1985, alkynyliodonium salts have been intensively used for the alkynylation of nucleophiles, in particular soft carbon nucleophiles and heteroatoms. They have made an especially strong impact in the synthesis of highly useful ynamides. Nevertheless, their use has been limited by their instability. Since 2009, more stable ethynylbenziodoxol(on)e (EBX) reagents have been identified as superior electrophilic alkyne synthons in many transformations. They can be used for the alkynylation of acidic C-H bonds with bases or aromatic C-H bonds using transition metal catalysts. They were also highly successful for the functionalization of radicals or transition metal-catalyzed domino processes. Finally, they allowed the alkynylation of a further range of heteroatom nucleophiles, especially thiols, under exceptionally mild conditions. With these recent developments, hypervalent iodine reagents have definitively demonstrated their utility for the efficient synthesis of alkynes based on non-classical disconnections.
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37
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Frei R, Wodrich M, Hari DP, Borin PA, Chauvier C, Waser J. Fast and highly chemoselective alkynylation of thiols with hypervalent iodine reagents enabled through a low energy barrier concerted mechanism. J Am Chem Soc 2014; 136:16563-73. [PMID: 25365776 PMCID: PMC4311943 DOI: 10.1021/ja5083014] [Citation(s) in RCA: 167] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Indexed: 01/08/2023]
Abstract
Among all functional groups, alkynes occupy a privileged position in synthetic and medicinal chemistry, chemical biology, and materials science. Thioalkynes, in particular, are highly useful, as they combine the enhanced reactivity of the triple bond with a sulfur atom frequently encountered in bioactive compounds and materials. Nevertheless, general methods to access these compounds are lacking. In this article, we describe the mechanism and full scope of the alkynylation of thiols using ethynyl benziodoxolone (EBX) hypervalent iodine reagents. Computations led to the discovery of a new, three-atom concerted transition state with a very low energy barrier, which rationalizes the high reaction rate. On the basis of this result, the scope of the reaction was extended to the synthesis of aryl- and alkyl-substituted alkynes containing a broad range of functional groups. New sulfur nucleophiles such as thioglycosides, thioacids, and sodium hydrogen sulfide were also alkynylated successfully to lead to the most general and practical method yet reported for the synthesis of thioalkynes.
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Affiliation(s)
| | - Matthew
D. Wodrich
- Laboratory of Catalysis and
Organic Synthesis, Ecole Polytechnique Fédérale
de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
| | - Durga Prasad Hari
- Laboratory of Catalysis and
Organic Synthesis, Ecole Polytechnique Fédérale
de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
| | - Pierre-Antoine Borin
- Laboratory of Catalysis and
Organic Synthesis, Ecole Polytechnique Fédérale
de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
| | - Clément Chauvier
- Laboratory of Catalysis and
Organic Synthesis, Ecole Polytechnique Fédérale
de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
| | - Jérôme Waser
- Laboratory of Catalysis and
Organic Synthesis, Ecole Polytechnique Fédérale
de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
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