1
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Judd KD, Parsons SW, Eremin DB, Fokin VV, Dawlaty JM. Visualizing partial solvation at the air-water interface. Chem Sci 2024; 15:8346-8354. [PMID: 38846382 PMCID: PMC11151832 DOI: 10.1039/d4sc01311e] [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: 02/25/2024] [Accepted: 04/08/2024] [Indexed: 06/09/2024] Open
Abstract
Despite significant research, the mechanistic nuances of unusual reactivity at the air-water interface, especially in microdroplets, remain elusive. The likely contributors include electric fields and partial solvation at the interface. To reveal these intricacies, we measure the frequency shift of a well-defined azide vibrational probe at the air-water interface, while independently controlling the surface charge density by introducing surfactants. First, we establish the response of the probe in the bulk and demonstrate that it is sensitive to both electrostatics and hydrogen bonding. From interfacial spectroscopy we infer that the azide is neither fully hydrated nor in a completely aprotic dielectric environment; instead, it experiences an intermediate environment. In the presence of hydrogen bond-accepting sulphate surfactants, competition arises for interfacial water with the azide. However, the dominant influence stems from the electrostatic effect of their negative heads, resulting in a significant blue-shift. Conversely, for the positive ammonium surfactants, our data indicate a balanced interplay between electrostatics and hydrogen bonding, leading to a minimal shift in the probe. Our results demonstrate partial solvation at the interface and highlights that both hydrogen bonding and electrostatics may assist or oppose each other in polarizing a reactant, intermediate, or product at the interface, which is important for understanding and tuning interfacial reactivity.
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Affiliation(s)
- Kenneth D Judd
- Department of Chemistry, The University of Southern California Los Angeles CA 90089 USA
| | - Sean W Parsons
- Department of Chemistry, The University of Southern California Los Angeles CA 90089 USA
| | - Dmitry B Eremin
- Department of Chemistry, The University of Southern California Los Angeles CA 90089 USA
| | - Valery V Fokin
- Department of Chemistry, The University of Southern California Los Angeles CA 90089 USA
| | - Jahan M Dawlaty
- Department of Chemistry, The University of Southern California Los Angeles CA 90089 USA
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2
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Murayama S, Li Z, Liang H, Liu Y, Naka H, Maruoka K. Impact of Catalyst Deuteration on the Reactivity of Chiral Phase-Transfer Organocatalysts. Chemistry 2023; 29:e202301866. [PMID: 37332072 DOI: 10.1002/chem.202301866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 06/16/2023] [Accepted: 06/16/2023] [Indexed: 06/20/2023]
Abstract
Site-specifically deuterated organocatalysts were prepared and found to show improved reactivity over the non-deuterated analogs. Two privileged C2 -symmetric chiral binaphthyl-modified tetraalkylammonium salts were selected for this study. The stability of these phase-transfer catalysts was generally improved by site-specific deuteration, though the degree of improvement was structure dependent. In particular, a large secondary kinetic isotope effect was observed for the tetradeuterated phase-transfer catalyst. The performance of these deuterated catalysts in the asymmetric catalytic alkylation of amino acid derivatives was better than that of non-deuterated analogs at low catalyst loadings. The results suggest that catalyst deuteration is a promising strategy for enhancing the stability and performance of organocatalysts.
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Affiliation(s)
- Sei Murayama
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Zhurong Li
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Huatai Liang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Yan Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Hiroshi Naka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
- Deuterium Science Research Unit Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, 606-8501, Japan
| | - Keiji Maruoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
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3
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G M, Sharma D, Dandela R, Dhayalan V. Synthetic Strategies of N-Heterocyclic Olefin (NHOs) and Their Recent Application of Organocatalytic Reactions and Beyond. Chemistry 2023:e202302106. [PMID: 37605950 DOI: 10.1002/chem.202302106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 08/23/2023]
Abstract
N-heterocyclic olefin (NHO) derivatives have an electron-rich as well as highly polarized carabon-carbon (C=C) double bond because of the electron-donating nature of nitrogen and sulphur atoms. While NHOs have been developing as novel organocatalysts and ligands for transition-metal complexes in various organic compound syntheses, different research groups are currently interested in preparing imidazole and triazolium-based chiral NHO catalysts. Some of them have been used for enantioselective organic transformations, but were still elusive. N-heterocyclic olefins, the alkylidene derivatives of N-heterocyclic carbenes (NHC), have shown promising results as effective promoters for numerous organic syntheses such as asymmetric catalysis, hydroborylation, hydrosilylation, reduction, CO2 sequestration, alkylation, cycloaddition, polymerization and the ring-opening reaction of aziridine and epoxides, esterification, C-F bond functionalization, amine coupling, trifluoromethyl thiolation, amination etc. NHOs catalysts with suitable structures can serve as a novel class of Lewis/Bronsted bases with strong basicity and high nucleophilicity properties.These facts strongly suggest their enormous chemical potential as sustainable catalysts for a wide variety of reactions in synthetic chemistry. The synthesis of NHOs and their properties are briefly reviewed in this article, along with a summary of the imidazole and triazole core of NHOs' most recent catalytic uses.
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Affiliation(s)
- Mahantesh G
- Department of Chemistry, National Institute of Technology Puducherry, Karaikal, 609609, Union Territory Puducherry, India
| | - Deepika Sharma
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology, Indian oil Odisha Campus, IIT, Kharagpur extension Centre Mouza Samantpuri, Bhubaneswar, 751013, Odisha, India
| | - Rambabu Dandela
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology, Indian oil Odisha Campus, IIT, Kharagpur extension Centre Mouza Samantpuri, Bhubaneswar, 751013, Odisha, India
| | - Vasudevan Dhayalan
- Department of Chemistry, National Institute of Technology Puducherry, Karaikal, 609609, Union Territory Puducherry, India
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4
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Yang H, Yu H, Stolarzewicz IA, Tang W. Enantioselective Transformations in the Synthesis of Therapeutic Agents. Chem Rev 2023; 123:9397-9446. [PMID: 37417731 DOI: 10.1021/acs.chemrev.3c00010] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
The proportion of approved chiral drugs and drug candidates under medical studies has surged dramatically over the past two decades. As a consequence, the efficient synthesis of enantiopure pharmaceuticals or their synthetic intermediates poses a profound challenge to medicinal and process chemists. The significant advancement in asymmetric catalysis has provided an effective and reliable solution to this challenge. The successful application of transition metal catalysis, organocatalysis, and biocatalysis to the medicinal and pharmaceutical industries has promoted drug discovery by efficient and precise preparation of enantio-enriched therapeutic agents, and facilitated the industrial production of active pharmaceutical ingredient in an economic and environmentally friendly fashion. The present review summarizes the most recent applications (2008-2022) of asymmetric catalysis in the pharmaceutical industry ranging from process scales to pilot and industrial levels. It also showcases the latest achievements and trends in the asymmetric synthesis of therapeutic agents with state of the art technologies of asymmetric catalysis.
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Affiliation(s)
- He Yang
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China
| | - Hanxiao Yu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China
| | - Izabela A Stolarzewicz
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China
- School of Chemistry and Material Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
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5
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Reyes E, Prieto L, Milelli A. Asymmetric Organocatalysis: A Survival Guide to Medicinal Chemists. Molecules 2022; 28:271. [PMID: 36615465 PMCID: PMC9822454 DOI: 10.3390/molecules28010271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/16/2022] [Accepted: 12/21/2022] [Indexed: 12/30/2022] Open
Abstract
Majority of drugs act by interacting with chiral counterparts, e.g., proteins, and we are, unfortunately, well-aware of how chirality can negatively impact the outcome of a therapeutic regime. The number of chiral, non-racemic drugs on the market is increasing, and it is becoming ever more important to prepare these compounds in a safe, economic, and environmentally sustainable fashion. Asymmetric organocatalysis has a long history, but it began its renaissance era only during the first years of the millennium. Since then, this field has reached an extraordinary level, as confirmed by the awarding of the 2021 Chemistry Nobel Prize. In the present review, we wish to highlight the application of organocatalysis in the synthesis of enantio-enriched molecules that may be of interest to the pharmaceutical industry and the medicinal chemistry community. We aim to discuss the different activation modes observed for organocatalysts, examining, for each of them, the generally accepted mechanisms and the most important and developed reactions, that may be useful to medicinal chemists. For each of these types of organocatalytic activations, select examples from academic and industrial applications will be disclosed during the synthesis of drugs and natural products.
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Affiliation(s)
- Efraim Reyes
- Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), 48080 Bilbao, Spain
| | - Liher Prieto
- Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), 48080 Bilbao, Spain
| | - Andrea Milelli
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d’Augusto 237, 47921 Rimini, Italy
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6
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Guo Y, Wu L, Qiu FG. Highly Diastereo- and Enantioselective Formal [4 + 2] Cyclization of Nitroalkenes and Unsaturated Ketoesters under Phase-Transfer Catalysis. Org Lett 2022; 24:8370-8374. [DOI: 10.1021/acs.orglett.2c03418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yiming Guo
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Linping Wu
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fayang G. Qiu
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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7
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Kumar A, Sasai H, Takizawa S. Atroposelective Synthesis of C-C Axially Chiral Compounds via Mono- and Dinuclear Vanadium Catalysis. Acc Chem Res 2022; 55:2949-2965. [PMID: 36206455 DOI: 10.1021/acs.accounts.2c00545] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Axially chiral compounds with rotationally constrained σ-bonds that exhibit atropisomerism are lucrative synthetic targets because of their ubiquity in functional materials and natural products. The metal complex-catalyzed enantioselective fabrication of axially chiral scaffolds has been widely investigated, and thus far, considerable progress has been made. Over the past two decades, we have developed a highly efficient strategy for constructing axially chiral biarenol derivatives using chiral mono- and dinuclear vanadium complexes. These complexes are readily prepared from vanadium(IV) salts and Schiff base ligands (generated from the condensation of (S)-tert-leucine and di- or monoformyl-(R)-1,1'-bi-2-naphthol (BINOL) derivatives) under O2 and act as highly active catalysts for highly stereoselective C-C bond formation. In particular, the vanadium complex-catalyzed enantioselective oxidative coupling of 2-naphthols 1 under oxygen or in air, which is a green oxidant, affords the desired axially chiral molecules in high yields and high stereoselectivity (up to quantitative yield and 97% ee), along with water as the sole coproduct. This coupling reaction tolerated various functional groups (such as halogens, alkoxys, and boryls) and avoided overoxidation of coupling products.The key feature of dinuclear vanadium(V) catalysts such as (Ra,S,S)-5a is an outstanding mode of the homocoupling reaction, in which a single molecule of the catalyst activates two molecules of the starting material (e.g., 2-naphthols) simultaneously. With this "dual activation" mechanism, the oxidative coupling promoted by the dinuclear catalyst proceeds in an intramolecular manner. The homocoupling rate using 5 mol % of the dinuclear vanadium(V) complex (Ra,S,S)-5a was measured to be 111 times faster than that of the mononuclear vanadium(IV) complex (S)-4a bearing a half motif of the dinuclear vanadium complex.In the case of the heterocoupling reaction utilizing two different kinds of arenol derivatives, only a starting arenol having lower oxidation potential seems to be activated by the mononuclear vanadium complex. The reaction rate of the heterocoupling using either mono- or dinuclear vanadium complexes showed no difference to give the coupling product in high yields but with a different enantioselective manner; chiral mononuclear vanadium(V) complexes showed better enantioselectivites than that of the dinuclear vanadium(V) complexes. A competing heterocoupling study and a linear correlation between the ee of the mononucaler vanadium catalyst and ee of the heterocoupling suggested that the heterocoupling involves an intermolecular radical-anion coupling pathway.In this Account, we summarize the recent advances in vanadium-catalyzed coupling reactions that produced important chiral molecules, such as biresorcinols, polycyclic biphenols, oxa[9]helicenes, bihydroxycarbazoles, and C1-symmetrical biarenols, and their coupling reaction mechanisms. By pursuing vanadium catalysis, we believe numerous additional transformations as well as a renewed interest in catalytic and chemo-, regio-, and enantioselective aryl-aryl bond constructions will be manifested.
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Affiliation(s)
- Ankit Kumar
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Hiroaki Sasai
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan.,Graduate School of Pharmaceutical Sciences, Osaka University, Yamadaoka, Suita-shi, Osaka 565-0871, Japan
| | - Shinobu Takizawa
- SANKEN, Osaka University, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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8
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Buttard F, Champagne PA. Binding Modes and Origins of Enantioselectivity in the Phase-Transfer-Catalyzed Conjugate Cyanation of β-Trifluoromethylated Chalcones. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Floris Buttard
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Pier Alexandre Champagne
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
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9
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Lee S, Chung W. Enantioselective halogenation via asymmetric
phase‐transfer
catalysis. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sunggi Lee
- Department of Physics and Chemistry DGIST Daegu Republic of Korea
| | - Won‐jin Chung
- Department of Chemistry GIST Gwangju Republic of Korea
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10
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Liang H, Li Z, Liu Y, Murayama S, Naka H, Maruoka K. Synthesis of optically pure, deuterated Maruoka Catalysts and their chemical reactivity. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Keenan T, Jean A, Arseniyadis S. Phase-Transfer-Catalyzed Alkylation of Hydantoins. ACS ORGANIC & INORGANIC AU 2022; 2:312-317. [PMID: 36855589 PMCID: PMC9954259 DOI: 10.1021/acsorginorgau.1c00058] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly efficient, cost-effective, and environmentally friendly protocol is reported for the C5-selective alkylation of hydantoins under phase-transfer catalysis. The reactions are scalable and only require a catalytic amount of tetrabutylammonium bromide (TBAB) to achieve high yields under mild reaction conditions. Moreover, the method is applicable to a wide range of electrophiles, including alkyl-, allyl-, propargyl-, and benzyl halides, as well as acrylates and dibromoalkanes, but also to virtually any hydantoin precursor. We also highlight the potential for an enantioselective adaptation using a chiral phase-transfer catalyst.
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Affiliation(s)
- Thomas Keenan
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Alexandre Jean
- Industrial
Research Centre, Oril Industrie, 13 rue Desgenétais, 76210 Bolbec, France,
| | - Stellios Arseniyadis
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.,
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12
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Yu L, Liu J, Wang H, Xu L, Wu Y, Zheng C, Zhao G. Asymmetric Dieckmann Condensation towards Spirocyclic Oxindoles Catalyzed by Amino Acid‐Derived Phosphonium Salts. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Longhui Yu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Jun Liu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Hongyu Wang
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Lijun Xu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Yufei Wu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Changwu Zheng
- Innovation Research Institute of Traditional Chinese Medicine School of Pharmacy Shanghai University of Traditional Chinese Medicine Shanghai 201203 People's Republic of China
| | - Gang Zhao
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
- Innovation Research Institute of Traditional Chinese Medicine School of Pharmacy Shanghai University of Traditional Chinese Medicine Shanghai 201203 People's Republic of China
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13
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Chen L, Geng HY, Chen ZJ, Liang W, Jiao WY. Rapid entry to bispiro heterocycles merging five pharmacophores using phase-transfer catalysis. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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14
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Wang Y, Wang S, Qiu P, Fang L, Wang K, Zhang Y, Zhang C, Zhao T. Asymmetric α-electrophilic difluoromethylation of β-keto esters by phase transfer catalysis. Org Biomol Chem 2021; 19:4788-4795. [PMID: 33982742 DOI: 10.1039/d1ob00511a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An efficient and enantioselective α-electrophilic difluoromethylation of β-keto esters has been achieved by phase-transfer catalysis. This procedure is applicable to different kinds of β-keto esters with a series of cinchona-derived C-2' aryl-substituted phase-transfer catalysts. The reaction gives the corresponding products in good enantioselectivities (up to 83% ee) and yields (up to 92%) with high C/O regioselectivities (up to 98 : 2). Moreover, the C/O selectivity of β-keto esters could be easily reversed and controlled. This asymmetric difluoromethylation provided a novel and efficient way for introducing chiral C-CF2H groups.
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Affiliation(s)
- Yakun Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Shuaifei Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Peiyong Qiu
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Lizhen Fang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Ke Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Yawei Zhang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Conghui Zhang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
| | - Ting Zhao
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China.
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15
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Gao Z, Qian J, Yang H, Zhang J, Jiang G. Enantioselective Construction of C-C Axially Chiral Quinazolinones via Chirality Exchange and Phase-Transfer Catalysis. Org Lett 2021; 23:1731-1737. [PMID: 33586979 DOI: 10.1021/acs.orglett.1c00156] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A family of axially chiral quinazolinone-based heterobiaryls were constructed with high levels of enantiocontrol (up to 94% ee). Convergently, three different synthetic methods have been realized to prepare these valuable compounds including central-to-axial chirality transfer, dynamic kinetic resolution, and phase-transfer catalysis. Importantly, novel P,N-ligands with a π-π stacking can be derived from heterobiaryls by chirality exchange strategy or synthesized directly from complementary phase-transfer catalysis by using the inexpensive chiral quaternary ammonium salt.
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Affiliation(s)
- Zeng Gao
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jinlong Qian
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Huameng Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Jinlong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Gaoxi Jiang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
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16
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Saini P, Sonika, Singh G, Kaur G, Singh J, Singh H. Robust and Versatile Cu(I) metal frameworks as potential catalysts for azide-alkyne cycloaddition reactions: Review. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111432] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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A Remarkably Efficient Phase-Transfer Catalyzed Amination of α-Bromo-α, β-Unsaturated Ketones in Water. HETEROATOM CHEMISTRY 2021. [DOI: 10.1155/2021/6616458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Tandem conjugate addition–alkylation reaction of various amines with α-bromo-α, β-unsaturated ketones resulted in near-quantitative conversions into the corresponding aziridines when the reaction was carried out in the presence of 10 mol% of phase-transfer, PT catalysts in water. Some chiral quaternary ammonium salts derived from Cinchona alkaloids were investigated as water-stable PT catalysts. The scope and limitations of the reaction have also been investigated. The catalytic performances were significantly improved in comparison with the corresponding ordinary quaternary ammonium salt catalysts, and excellent yields (81%–96%) were obtained. Although an increase in the rate of aziridination has been accomplished, no stereoselectivity was observed. The positive values of the protocol have been confirmed.
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18
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López B, Bartra M, Berenguer R, Ariza X, Garcia J, Gómez R, Torralvo H. An Enantioselective Approach to 4-Substituted Proline Scaffolds: Synthesis of ( S)-5-( Tert-Butoxy Carbonyl)-5-Azaspiro[2.4]heptane-6-Carboxylic Acid. Molecules 2020; 25:molecules25235644. [PMID: 33266105 PMCID: PMC7729483 DOI: 10.3390/molecules25235644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 11/25/2020] [Accepted: 11/26/2020] [Indexed: 11/16/2022] Open
Abstract
A catalytic and enantioselective preparation of the (S)-4-methyleneproline scaffold is described. The key reaction is a one-pot double allylic alkylation of an imine analogue of glycine in the presence of a chinchonidine-derived catalyst under phase transfer conditions. These 4-methylene substituted proline derivatives are versatile starting materials often used in medicinal chemistry. In particular, we have transformed tert-butyl (S)-4-methyleneprolinate (12) into the N-Boc-protected 5-azaspiro[2.4]heptane-6-carboxylic acid (1), a key element in the industrial synthesis of antiviral ledipasvir.
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Affiliation(s)
- Blanca López
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain; (B.L.); (R.G.); (H.T.)
- R&D Department, Esteve Química S.A., Caracas 17-19, 08030 Barcelona, Spain; (M.B.); (R.B.)
| | - Martí Bartra
- R&D Department, Esteve Química S.A., Caracas 17-19, 08030 Barcelona, Spain; (M.B.); (R.B.)
| | - Ramon Berenguer
- R&D Department, Esteve Química S.A., Caracas 17-19, 08030 Barcelona, Spain; (M.B.); (R.B.)
| | - Xavier Ariza
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain; (B.L.); (R.G.); (H.T.)
- Institut de Biomedicina (IBUB), Universitat de Barcelona, 08028 Barcelona, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence: (X.A.); (J.G.)
| | - Jordi Garcia
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain; (B.L.); (R.G.); (H.T.)
- Institut de Biomedicina (IBUB), Universitat de Barcelona, 08028 Barcelona, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence: (X.A.); (J.G.)
| | - Roberto Gómez
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain; (B.L.); (R.G.); (H.T.)
- Institut de Biomedicina (IBUB), Universitat de Barcelona, 08028 Barcelona, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Hèctor Torralvo
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain; (B.L.); (R.G.); (H.T.)
- R&D Department, Esteve Química S.A., Caracas 17-19, 08030 Barcelona, Spain; (M.B.); (R.B.)
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19
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Affiliation(s)
- Xi‐Qiang Hou
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 People's Republic of China
| | - Da‐Ming Du
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 People's Republic of China
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20
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A novel quaternary ammonium salts derived from α-amino acids with large steric hindrance group and its application in asymmetric Mannich reaction. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Arakawa H, Takeda K, Higashi SL, Shibata A, Kitamura Y, Ikeda M. Self-assembly and hydrogel formation ability of Fmoc-dipeptides comprising α-methyl-L-phenylalanine. Polym J 2020. [DOI: 10.1038/s41428-019-0301-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
AbstractVarious biofunctional hydrogel materials can be fabricated in aqueous media through the self-assembly of peptide derivatives, forming supramolecular nanostructures and their three-dimensional networks. In this study, we describe the self-assembly of new Fmoc-dipeptides comprising α-methyl-L-phenylalanine. We found that the position and number of methyl groups introduced onto the α carbons of the Fmoc-dipeptides by α-methyl-L-phenylalanine have a marked influence on the morphology of the supramolecular nanostructure as well as the hydrogel (network) formation ability.
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22
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Fox RJ, Qiu J. General User Guide for Partitioning of Tetraalkylammonium and Tetraalkylphosphonium Salts: Impacts of Cation, Anion, and Solvent. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.9b00496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Richard J. Fox
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Jun Qiu
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
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23
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24
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Manaprasertsak A, Tharamak S, Schedl C, Roller A, Widhalm M. Improved Access to Chiral Tetranaphthoazepinium-Based Organocatalysts Using Aqueous Ammonia as Nitrogen Source. Molecules 2019; 24:molecules24213844. [PMID: 31731415 PMCID: PMC6864439 DOI: 10.3390/molecules24213844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 11/16/2022] Open
Abstract
The class of 3,3'-diaryl substituted tetranaphthobisazepinium bromides has found wide application as highly efficient C2-symmetrical phase-transfer catalysts (PTCs, Maruoka type catalysts). Unfortunately, the synthesis requires a large number of steps and hampers the build-up of catalyst libraries which are often desired for screening experiments. Here, we present a more economic strategy using dinaphthoazepine 7 as the common key intermediate. Only at this stage various aryl substituents are introduced, and only two individual steps are required to access target structures. This protocol was applied to synthesize ten tetranaphthobisazepinium compounds 1a-1j. Their efficiency as PTCs was tested in the asymmetric substitution of tert-butyl 2-((diphenylmethylene)amino)acetate. Enantioselectivities up to 92% have been observed with new catalysts.
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Affiliation(s)
- Auraya Manaprasertsak
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand; (A.M.); (S.T.)
| | - Sorachat Tharamak
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand; (A.M.); (S.T.)
| | - Christina Schedl
- Institute of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Wien, Austria;
| | - Alexander Roller
- Institute of Inorganic Chemistry, University of Vienna, Währinger Straße 42, Wien 1090, Austria;
| | - Michael Widhalm
- Institute of Chemical Catalysis, University of Vienna, Währinger Straße 38, 1090 Wien, Austria
- Correspondence: ; Tel.: +43-01-4277-70305
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25
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Carlone A, Bernardi L. Enantioselective organocatalytic approaches to active pharmaceutical ingredients – selected industrial examples. PHYSICAL SCIENCES REVIEWS 2019. [DOI: 10.1515/psr-2018-0097] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Abstract
Catalysis is, often, the preferred approach to access chiral molecules in enantioenriched form both in academia and in industry; nowadays, organocatalysis is recognised as the third pillar in asymmetric catalysis, along with bio- and metal-catalysis. Despite enormous advancements in academic research, there is a common belief that organocatalysis is not developed enough to be applicable in industry. In this review, we describe a selection of industrial routes and their R&D process for the manufacture of active pharmaceutical ingredients, highlighting how asymmetric organocatalysis brings added value to an industrial process. The thorough study of the steps, driven by economic stimuli, developed and improved chemistry that was, otherwise, believed to not be applicable in an industrial setting. The knowledge discussed in the reviewed papers will be an invaluable resource for the whole research community.
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26
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Willig F, Lang J, Hans AC, Ringenberg MR, Pfeffer D, Frey W, Peters R. Polyfunctional Imidazolium Aryloxide Betaine/Lewis Acid Catalysts as Tools for the Asymmetric Synthesis of Disfavored Diastereomers. J Am Chem Soc 2019; 141:12029-12043. [DOI: 10.1021/jacs.9b04902] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Felix Willig
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Johannes Lang
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Andreas C. Hans
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Mark R. Ringenberg
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Daniel Pfeffer
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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27
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O'Donnell MJ. Benzophenone Schiff bases of glycine derivatives: Versatile starting materials for the synthesis of amino acids and their derivatives. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.03.029] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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28
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Brodbeck D, Álvarez-Barcia S, Meisner J, Broghammer F, Klepp J, Garnier D, Frey W, Kästner J, Peters R. Asymmetric Carboxycyanation of Aldehydes by Cooperative AlF/Onium Salt Catalysts: from Cyanoformate to KCN as Cyanide Source. Chemistry 2019; 25:1515-1524. [PMID: 30359465 DOI: 10.1002/chem.201804388] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 10/10/2018] [Indexed: 01/01/2023]
Abstract
Asymmetric 1,2-additions of cyanide yield enantioenriched cyanohydrins as versatile chiral building blocks. Next to HCN, volatile organic cyanide sources are usually used. Among them, cyanoformates are more attractive on technical scale than TMSCN for cost reasons, but catalytic productivity is usually lower. Here, the development of a new strategy for cyanations is described, in which this activity disadvantage is overcome. A Lewis acidic Al center cooperates with an aprotic onium moiety within a remarkably robust bifunctional Al-F-salen complex. This allowed for unprecedented turnover numbers of up to 104 . DFT studies suggest an unexpected unique trimolecular pathway in which the ammonium bound cyanide attacks the aldehyde, which itself is activated by the carbonyl group of the cyanoformate binding to the Al center. In addition, a novel practical carboxycyanation method was developed that makes use of KCN as the sole cyanide source. The use of a pyrocarbonate as carboxylating reagent provided the best results.
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Affiliation(s)
- Daniel Brodbeck
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Sonia Álvarez-Barcia
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Jan Meisner
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Florian Broghammer
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Julian Klepp
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Delphine Garnier
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Johannes Kästner
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - René Peters
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
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29
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Mokary Yazdely T, Ghorbanloo M, Hosseini-Monfared H. An amphiphilic manganese porphyrin-paired ionic copolymer: a highly efficient biphasic transfer catalyst for the selective oxidation of olefins with O2 and TBHP. NEW J CHEM 2019. [DOI: 10.1039/c9nj02459j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A novel amphiphilic manganese porphyrin-paired ionic copolymer, {ADA-INA-[Mn(TPPS)(OAc)]}n, was prepared by the self-assembly process of non-cross-linked amphiphilic polymeric ligands with inorganic species.
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Affiliation(s)
| | - Massomeh Ghorbanloo
- Department of Chemistry
- Faculty of Science
- University of Zanjan
- 45371-38791 Zanjan
- Iran
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30
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Wang Y, Li Y, Lian M, Zhang J, Liu Z, Tang X, Yin H, Meng Q. Asymmetric α-alkylation of cyclic β-keto esters and β-keto amides by phase-transfer catalysis. Org Biomol Chem 2019; 17:573-584. [DOI: 10.1039/c8ob02669f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A facile and efficient asymmetric α-alkylation of β-keto esters and β-keto amides has been achieved by phase-transfer catalysis.
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Affiliation(s)
- Yakun Wang
- School of Pharmacy
- Xinxiang Medical University
- Xinxiang
- PR China
| | - Yueyun Li
- Xinxiang Central Hospital
- Xinxiang Medical University
- Xinxiang
- PR China
| | - Mingming Lian
- Department of Pharmaceutics
- Daqing Campus
- Harbin Medical University
- Daqing
- P. R. China
| | - Jixia Zhang
- School of Pharmacy
- Xinxiang Medical University
- Xinxiang
- PR China
| | - Zhaomin Liu
- School of Pharmacy
- Xinxiang Medical University
- Xinxiang
- PR China
| | - Xiaofei Tang
- School of Pharmaceutical Science and Technology
- Dalian University of Technology
- Dalian
- P. R. China
| | - Hang Yin
- School of Pharmaceutical Science and Technology
- Dalian University of Technology
- Dalian
- P. R. China
| | - Qingwei Meng
- School of Pharmaceutical Science and Technology
- Dalian University of Technology
- Dalian
- P. R. China
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31
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MARUOKA K. Design of high-performance chiral phase-transfer catalysts with privileged structures. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2019; 95:1-16. [PMID: 30643092 PMCID: PMC6395783 DOI: 10.2183/pjab.95.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In the end of the 20th century, due to various advantages of organocatalysis including environmental friendliness, operational simplicity, mild reaction conditions, easy recovery etc., had led to its recognition as a powerful strategy for the establishment of practical organic synthetic methods. Over the two decades since then, tremendous effort has been devoted to the design of novel high-performance organocatalysts to realize unprecedented reactions including asymmetric transformations. In this review, our recent results on the rational design of various types of chiral phase-transfer catalysts with privileged structures, and their successful application to a wide variety of asymmetric transformations are described.
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Affiliation(s)
- Keiji MARUOKA
- Graduate School of Science, Kyoto University, Kyoto, Japan
- Correspondence should be addressed: K. Maruoka, Laboratory of Synthetic Organic Chemistry and Special Laboratory of Organocatalytic Chemistry, Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan (e-mail: )
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32
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Li W, Wang Y, Xu D. Asymmetric synthesis of β-amino ketones by using cinchona alkaloid-based chiral phase transfer catalysts. Org Biomol Chem 2018; 16:8704-8709. [PMID: 30411772 DOI: 10.1039/c8ob02484g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly enantioselective nucleophilic addition of ketones to imines catalyzed by chiral phase-transfer catalysts (N-quaternised cinchona alkaloid ammonium salts) has been developed, and the process affords the Mannich reaction products with tertiary stereocenters in good to high yields (up to 95%) with excellent enantioselectivities (up to 97% ee).
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Affiliation(s)
- Weihua Li
- State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, China.
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Abstract
Phase-transfer catalysts (PTCs), currently, are one of the most important tools of chemists for performing organic reactions. PTCs accelerate several types of reactions in biphasic systems, giving excellent yields of the desired product. Most of the PTCs belong to the general formula NR4+X-. In the recent past, several compounds possessing a novel scaffold with the general formula NL2+X- have been reported as PTCs. In the NL2+ species, a nitrogen atom with a formal positive charge accepts electron density from electron-donating ligands. Electronic structure studies reported in the literature confirmed the possibility of L → N coordination (donor-acceptor) interactions in these species, and thus, this class of compounds are known as divalent NI compounds. These species are reported to exhibit better catalytic potential in comparison to the traditional NR4+ systems. Some of the NL2+ systems are found to be useful in asymmetric phase-transfer catalysis. Thus, these systems offer extensive opportunities for exploring the catalytic properties and novel mechanistic aspects associated with their unique electronic structure. In this paper, the synthesis, electronic, and structural properties and the applications in catalysis of the NL2+-based PTCs are reviewed with their bright future scope in catalytic organic chemistry.
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Affiliation(s)
- Neha Patel
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, Sahibzada Ajit Singh Nagar 160 062 , Punjab , India
| | - Radhika Sood
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, Sahibzada Ajit Singh Nagar 160 062 , Punjab , India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, Sahibzada Ajit Singh Nagar 160 062 , Punjab , India
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34
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Frías M, Cieślik W, Fraile A, Rosado-Abón A, Garrido-Castro AF, Yuste F, Alemán J. Development and Application of Asymmetric Organocatalytic Mukaiyama and Vinylogous Mukaiyama-Type Reactions. Chemistry 2018; 24:10906-10933. [DOI: 10.1002/chem.201801866] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Indexed: 02/02/2023]
Affiliation(s)
- María Frías
- Department of Organic Chemistry; Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente, 7; Cantoblanco 28049 Madrid Spain
| | - Wioleta Cieślik
- Department of Organic Chemistry; Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente, 7; Cantoblanco 28049 Madrid Spain
| | - Alberto Fraile
- Department of Organic Chemistry; Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente, 7; Cantoblanco 28049 Madrid Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem); Universidad Autónoma de Madrid; 28049 Madrid Spain
| | - Anielka Rosado-Abón
- Instituto de Química; Universidad Nacional Autónoma de México; Circuito Exterior, Cd. Universitaria, Coyoacán 04510 México D.F. México
| | - Alberto F. Garrido-Castro
- Department of Organic Chemistry; Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente, 7; Cantoblanco 28049 Madrid Spain
| | - Francisco Yuste
- Instituto de Química; Universidad Nacional Autónoma de México; Circuito Exterior, Cd. Universitaria, Coyoacán 04510 México D.F. México
| | - José Alemán
- Department of Organic Chemistry; Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente, 7; Cantoblanco 28049 Madrid Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem); Universidad Autónoma de Madrid; 28049 Madrid Spain
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35
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High-efficiency α-benzoyloxylation and hydroxylation of β-keto amides by phase transfer catalysis. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.06.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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36
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Catalytic asymmetric synthesis of α-methyl-p-boronophenylalanine. Bioorg Med Chem Lett 2018; 28:1915-1918. [DOI: 10.1016/j.bmcl.2018.03.075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 03/23/2018] [Accepted: 03/27/2018] [Indexed: 11/23/2022]
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37
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Broghammer F, Brodbeck D, Junge T, Peters R. Cooperative Lewis acid-onium salt catalysis as tool for the desymmetrization of meso-epoxides. Chem Commun (Camb) 2018; 53:1156-1159. [PMID: 28054051 DOI: 10.1039/c6cc09774j] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Epoxide desymmetrizations by bromide are very rare despite the large synthetic potential of chiral bromohydrins. Herein we present a new concept for epoxide desymmetrizations in which a bifunctional Lewis acid/ammonium salt catalyst allows for efficient enantioselective epoxide ring openings by Br-. With acetylbromide as a Br- source bromohydrin esters are formed.
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Affiliation(s)
- Florian Broghammer
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - Daniel Brodbeck
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - Thorsten Junge
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - René Peters
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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38
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Wang Y, Gao Q, Liu Z, Bai S, Tang X, Yin H, Meng Q. Enantioselective α-Benzoyloxylation of β-Keto Esters by N-Oxide Phase-Transfer Catalysts. J Org Chem 2018; 83:2263-2273. [DOI: 10.1021/acs.joc.7b03150] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yakun Wang
- School
of Pharmacy, Xinxiang Medical University, Xinxiang, 453003 Henan, People’s Republic of China
- School
of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, 116024 Liaoning, People’s Republic of China
| | - Qinghe Gao
- School
of Pharmacy, Xinxiang Medical University, Xinxiang, 453003 Henan, People’s Republic of China
| | - Zhaomin Liu
- School
of Pharmacy, Xinxiang Medical University, Xinxiang, 453003 Henan, People’s Republic of China
| | - Suping Bai
- School
of Pharmacy, Xinxiang Medical University, Xinxiang, 453003 Henan, People’s Republic of China
| | - Xiaofei Tang
- School
of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, 116024 Liaoning, People’s Republic of China
| | - Hang Yin
- School
of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, 116024 Liaoning, People’s Republic of China
| | - Qingwei Meng
- School
of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, 116024 Liaoning, People’s Republic of China
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39
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Lee HJ, Eun B, Sung E, Hwang GT, Ko YK, Cho CW. Catalytic enantioselective synthesis of carboxy-substituted 2-isoxazolines by cascade oxa-Michael-cyclization. Org Biomol Chem 2018; 16:657-664. [PMID: 29303197 DOI: 10.1039/c7ob02722b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
An efficient quinidine-based phase-transfer-catalyzed enantioselective cascade oxa-Michael-cyclization reaction of hydroxylamine with various β-carboxy-substituted α,β-unsaturated ketones has been achieved for the preparation of chiral carboxy-substituted 2-isoxazolines. This cascade reaction provided the desired products in good yields (up to 98%) with excellent enantioselectivities (91-96% ee). In addition, the cascade reaction was effectively applied to the first catalytic asymmetric synthesis of the herbicide (S)-methiozolin.
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Affiliation(s)
- Hyo-Jun Lee
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
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40
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Golandaj A, Ahmad A, Ramjugernath D. Phosphonium Salts in Asymmetric Catalysis: A Journey in a Decade's Extensive Research Work. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700795] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Ajij Golandaj
- Thermodynamics Research Unit, School of Chemical Engineering; University of KwaZulu-Natal; Howard College Campus, Private Bag X54001 Durban 4041 Republic of South Africa
| | - Akil Ahmad
- Thermodynamics Research Unit, School of Chemical Engineering; University of KwaZulu-Natal; Howard College Campus, Private Bag X54001 Durban 4041 Republic of South Africa
| | - Deresh Ramjugernath
- Thermodynamics Research Unit, School of Chemical Engineering; University of KwaZulu-Natal; Howard College Campus, Private Bag X54001 Durban 4041 Republic of South Africa
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41
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Schörgenhumer J, Tiffner M, Waser M. Chiral phase-transfer catalysis in the asymmetric α-heterofunctionalization of prochiral nucleophiles. Beilstein J Org Chem 2017; 13:1753-1769. [PMID: 28904619 PMCID: PMC5588627 DOI: 10.3762/bjoc.13.170] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 08/10/2017] [Indexed: 01/10/2023] Open
Abstract
Chiral phase-transfer catalysis is one of the major catalytic principles in asymmetric catalysis. A broad variety of different catalysts and their use for challenging applications have been reported over the last decades. Besides asymmetric C–C bond forming reactions the use of chiral phase-transfer catalysts for enantioselective α-heterofunctionalization reactions of prochiral nucleophiles became one of the most important field of application of this catalytic principle. Based on several highly spectacular recent reports, we thus wish to discuss some of the most important achievements in this field within the context of this review.
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Affiliation(s)
- Johannes Schörgenhumer
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Maximilian Tiffner
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria
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42
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He CQ, Simon A, Lam YH, Brunskill APJ, Yasuda N, Tan J, Hyde AM, Sherer EC, Houk KN. Model for the Enantioselectivity of Asymmetric Intramolecular Alkylations by Bis-Quaternized Cinchona Alkaloid-Derived Catalysts. J Org Chem 2017; 82:8645-8650. [DOI: 10.1021/acs.joc.7b01577] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Cyndi Qixin He
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Adam Simon
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Yu-hong Lam
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Andrew P. J. Brunskill
- Department
of Process Chemistry, Merck and Co., Inc., P.O. Box 2000, Rahway, New
Jersey 07065, United States
| | - Nobuyoshi Yasuda
- Department
of Process Chemistry, Merck and Co., Inc., P.O. Box 2000, Rahway, New
Jersey 07065, United States
| | - Jiajing Tan
- Department
of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, China
| | - Alan M. Hyde
- Department
of Process Chemistry, Merck and Co., Inc., P.O. Box 2000, Rahway, New
Jersey 07065, United States
| | - Edward C. Sherer
- Department
of Process Chemistry, Merck and Co., Inc., P.O. Box 2000, Rahway, New
Jersey 07065, United States
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
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43
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Hu YH, Wang JC, Yang S, Li YA, Dong YB. CuI@UiO-67-IM: A MOF-Based Bifunctional Composite Triphase-Transfer Catalyst for Sequential One-Pot Azide–Alkyne Cycloaddition in Water. Inorg Chem 2017. [DOI: 10.1021/acs.inorgchem.7b01025] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yu-Hong Hu
- College of Chemistry, Chemical Engineering
and Materials Science, Collaborative Innovation Centre of Functionalized
Probes for Chemical Imaging in Universities of Shandong, Key Laboratory
of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
| | - Jian-Cheng Wang
- College of Chemistry, Chemical Engineering
and Materials Science, Collaborative Innovation Centre of Functionalized
Probes for Chemical Imaging in Universities of Shandong, Key Laboratory
of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
| | - Song Yang
- College of Chemistry, Chemical Engineering
and Materials Science, Collaborative Innovation Centre of Functionalized
Probes for Chemical Imaging in Universities of Shandong, Key Laboratory
of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
| | - Yan-An Li
- College of Chemistry, Chemical Engineering
and Materials Science, Collaborative Innovation Centre of Functionalized
Probes for Chemical Imaging in Universities of Shandong, Key Laboratory
of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
| | - Yu-Bin Dong
- College of Chemistry, Chemical Engineering
and Materials Science, Collaborative Innovation Centre of Functionalized
Probes for Chemical Imaging in Universities of Shandong, Key Laboratory
of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China
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44
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Rapi Z, Nemcsok T, Pálvölgyi Á, Keglevich G, Grün A, Bakó P. Synthesis of l-threitol-based crown ethers and their application as enantioselective phase transfer catalyst in Michael additions. Chirality 2017; 29:257-272. [PMID: 28429401 DOI: 10.1002/chir.22678] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/05/2016] [Accepted: 12/15/2016] [Indexed: 12/11/2022]
Abstract
A few new l-threitol-based lariat ethers incorporating a monoaza-15-crown-5 unit were synthesized starting from diethyl l-tartrate. These macrocycles were used as phase transfer catalysts in asymmetric Michael addition reactions under mild conditions to afford the adducts in a few cases in good to excellent enantioselectivities. The addition of 2-nitropropane to trans-chalcone, and the reaction of diethyl acetamidomalonate with β-nitrostyrene resulted in the chiral Michael adducts in good enantioselectivities (90% and 95%, respectively). The substituents of chalcone had a significant impact on the yield and enantioselectivity in the reaction of diethyl acetoxymalonate. The highest enantiomeric excess (ee) values (99% ee) were measured in the case of 4-chloro- and 4-methoxychalcone. The phase transfer catalyzed cyclopropanation reaction of chalcone and benzylidene-malononitriles using diethyl bromomalonate as the nucleophile (MIRC reaction) was also developed. The corresponding chiral cyclopropane diesters were obtained in moderate to good (up to 99%) enantioselectivities in the presence of the threitol-based crown ethers.
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Affiliation(s)
- Zsolt Rapi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Tamás Nemcsok
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Ádám Pálvölgyi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Alajos Grün
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Péter Bakó
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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45
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Waseem MA, Lone AM, Ibad F, Ibad A, Yadav VB, Ansari K, Shairjogrey BA, Watal G, Siddiqui IR. Double Hydroamination of Alkyne via PTC and Microwave-activated Diastereoselective Synthesis of 2,3-dihydroimidazo[1,2-a]pyridine in an Aqueous Media. J Heterocycl Chem 2017. [DOI: 10.1002/jhet.2875] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Malik A. Waseem
- Laboratory of Green Synthesis, Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | - Ali Mohd Lone
- Department of Chemistry; University of Kashmir; Srinagar India
| | - Farah Ibad
- Medicinal Chemistry Laboratory, Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | - Afshan Ibad
- Medicinal Chemistry Laboratory, Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | - Vijay B. Yadav
- Laboratory of Green Synthesis, Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | - Khursheed Ansari
- Laboratory of Green Synthesis, Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | | | - Geeta Watal
- Department of Chemistry; University of Kashmir; Srinagar India
| | - I. R. Siddiqui
- Laboratory of Green Synthesis, Department of Chemistry; University of Allahabad; Allahabad 211002 India
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46
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Miguélez J, Miyamura H, Kobayashi S. A Polystyrene‐Supported Phase‐Transfer Catalyst for Asymmetric Michael Addition of Glycine‐Derived Imines to α,β‐Unsaturated Ketones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700155] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Javier Miguélez
- Department of Chemistry, School of Science The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-0033 Japan
| | - Hiroyuki Miyamura
- Department of Chemistry, School of Science The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-0033 Japan
| | - Shū Kobayashi
- Department of Chemistry, School of Science The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-0033 Japan
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47
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Brodbeck D, Broghammer F, Meisner J, Klepp J, Garnier D, Frey W, Kästner J, Peters R. An Aluminum Fluoride Complex with an Appended Ammonium Salt as an Exceptionally Active Cooperative Catalyst for the Asymmetric Carboxycyanation of Aldehydes. Angew Chem Int Ed Engl 2017; 56:4056-4060. [PMID: 28247498 DOI: 10.1002/anie.201612493] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Indexed: 01/01/2023]
Abstract
Al-F bonds are among the most stable σ bonds known, exhibiting an even higher bond energy than Si-F bonds. Despite a stability advantage and a potentially high Lewis acidity of Al-F complexes, they have not been described as structurally defined catalysts for enantioselective reactions. We show that Al-F salen complexes with appended ammonium moieties give exceptional catalytic activity in asymmetric carboxycyanations. In addition to aromatic aldehydes, enal and aliphatic substrates are well accepted. Turnover numbers up to around 104 were achieved, whereas with previous catalysts 101 -102 turnovers were typically attained. In contrast to Al-Me and Al-Cl salen complexes, the analogous Al-F species are remarkably stable towards air, water, and heat, and can be recovered unchanged after catalysis. They possess a considerably increased Lewis acidity as shown by DFT calculations.
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Affiliation(s)
- Daniel Brodbeck
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Florian Broghammer
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Jan Meisner
- Universität Stuttgart, Institut für Theoretische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Julian Klepp
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Delphine Garnier
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Wolfgang Frey
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Johannes Kästner
- Universität Stuttgart, Institut für Theoretische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - René Peters
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
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48
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Brodbeck D, Broghammer F, Meisner J, Klepp J, Garnier D, Frey W, Kästner J, Peters R. Ein Aluminium-Fluorid-Komplex mit gekoppelter Ammonium-Einheit als außergewöhnlich aktiver kooperativer Katalysator in der asymmetrischen Carboxycyanierung von Aldehyden. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612493] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Daniel Brodbeck
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Florian Broghammer
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Jan Meisner
- Universität Stuttgart; Institut für Theoretische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Julian Klepp
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Delphine Garnier
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Wolfgang Frey
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Johannes Kästner
- Universität Stuttgart; Institut für Theoretische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - René Peters
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Deutschland
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49
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Yan X, Cheng H, Zare RN. Two‐Phase Reactions in Microdroplets without the Use of Phase‐Transfer Catalysts. Angew Chem Int Ed Engl 2017; 56:3562-3565. [DOI: 10.1002/anie.201612308] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 02/06/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Xin Yan
- Department of Chemistry Stanford University 333 Campus Drive Stanford CA 94305-5080 USA
| | - Heyong Cheng
- Department of Chemistry Stanford University 333 Campus Drive Stanford CA 94305-5080 USA
| | - Richard N. Zare
- Department of Chemistry Stanford University 333 Campus Drive Stanford CA 94305-5080 USA
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50
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Yan X, Cheng H, Zare RN. Two‐Phase Reactions in Microdroplets without the Use of Phase‐Transfer Catalysts. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612308] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xin Yan
- Department of Chemistry Stanford University 333 Campus Drive Stanford CA 94305-5080 USA
| | - Heyong Cheng
- Department of Chemistry Stanford University 333 Campus Drive Stanford CA 94305-5080 USA
| | - Richard N. Zare
- Department of Chemistry Stanford University 333 Campus Drive Stanford CA 94305-5080 USA
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