1
|
Du HW, Du YD, Zeng XW, Shu W. Access to Trifluoromethylketones from Alkyl Bromides and Trifluoroacetic Anhydride by Photocatalysis. Angew Chem Int Ed Engl 2023; 62:e202308732. [PMID: 37534823 DOI: 10.1002/anie.202308732] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/04/2023]
Abstract
Aliphatic trifluoromethyl ketones are a type of unique fluorine-containing subunit which play a significant role in altering the physical and biological properties of molecules. Catalytic methods to provide direct access to aliphatic trifluoromethyl ketones are highly desirable yet remain underdeveloped, partially owing to the high reactivity and instability of trifluoroacetyl radical. Herein, we report a photocatalytic synthesis of trifluoromethyl ketones from alkyl bromides with trifluoroacetic anhydride. The reaction features dual visible-light and halogen-atom-transfer catalysis, followed by an enabling radical-radical cross-coupling of an alkyl radical with a stabilized trifluoromethyl radical. The reaction provides straightforward access to aliphatic trifluoromethyl ketones from readily available and cost-effective alkyl halides and trifluoroacetic anhydride (TFAA).
Collapse
Affiliation(s)
- Hai-Wu Du
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Yi-Dan Du
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Xian-Wang Zeng
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Wei Shu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjin, P. R. China
| |
Collapse
|
2
|
Wang X, Ji Z, Liu J, Wang B, Jin H, Zhang L. Advances in Organocatalytic Asymmetric Reactions Involving Thioesters. ACTA CHIMICA SINICA 2023. [DOI: 10.6023/a22100422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
|
3
|
Wang X, Feng F, Nie J, Zhang F, Ma J. Enantioselective Construction of Amino Carboxylic‐Phosphonic Acid Derivatives Enabled by Chiral Amino Thiourea‐Catalyzed Decarboxylative Mannich Reaction. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xue‐Qi Wang
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 People's Republic of China
| | - Fang‐Fang Feng
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 People's Republic of China
| | - Jing Nie
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 People's Republic of China
| | - Fa‐Guang Zhang
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 People's Republic of China
| | - Jun‐An Ma
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 People's Republic of China
| |
Collapse
|
4
|
Chowdhury R, Dubey MK, Waser M. Catalytic Enantioselective Decarboxylative Aldol reactions of Malonic acid half thio(oxy)ester and β‐ketoacids. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Raghunath Chowdhury
- Bhabha Atomic Research Centre Bio-Organic Division Tombay 400085 Mumbai INDIA
| | | | - Mario Waser
- Johannes Kepler Universität Linz: Johannes Kepler Universitat Linz Institute of Organic Chemistry AUSTRIA
| |
Collapse
|
5
|
Kerru N, Maddila S, Jonnalagadda SB. Organo-catalysis as emerging tools in organic synthesis: aldol and Michael reactions. PHYSICAL SCIENCES REVIEWS 2022. [DOI: 10.1515/psr-2021-0023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Organocatalysis has occupied sustainable position in organic synthesis as a powerful tool for the synthesis of enantiomeric-rich compounds with multiple stereogenic centers. Among the various organic molecules for organocatalysis, the formation of carbon–carbon is viewed as a challenging issue in organic synthesis. The asymmetric aldol and Michael addition reactions are the most significant methods for C–C bond forming reactions. These protocols deliver a valuable path to access chiral molecules, which are useful synthetic hybrids in biologically potent candidates and desirable versatile pharmaceutical intermediates. This work highlighted the impact of organocatalytic aldol and Michael addition reactions in abundant solvent media. It focused on the crucial methods to construct valuable molecules with high enantio- and diastereo-selectivity.
Collapse
Affiliation(s)
- Nagaraju Kerru
- Department of Chemistry , GITAM School of Science, GITAM University , Bengaluru , Karnataka - 561203 , India
| | - Suresh Maddila
- Department of Chemistry , GITAM Institute of Sciences, GITAM University , Visakhapatnam , Andhra Pradesh , India
- School of Chemistry & Physics, University of KwaZulu-Natal , Westville Campus , Chiltern Hills , Durban - 4000 , South Africa
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal , Westville Campus , Chiltern Hills , Durban - 4000 , South Africa
| |
Collapse
|
6
|
Jadhav AP, Park SY, Lee JW, Yan H, Song CE. Cooperative Asymmetric Cation-Binding Catalysis. Acc Chem Res 2021; 54:4319-4333. [PMID: 34784182 DOI: 10.1021/acs.accounts.1c00400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Asymmetric cation-binding catalysis in principle enables the use of (alkali) metal salts, otherwise insoluble in organic solvents, as reagents and effectors in enantioselective reactions. However, this concept has been a formidable challenge due to the difficulties associated with creating a highly organized chiral environment for cations and anions simultaneously. Over the last four decades, various chiral crown ethers have been developed as cation-binding phase-transfer catalysts and examined in asymmetric catalysis. However, the limited ability of chiral crown ethers to generate soluble reactive anions in a confined chiral cage offers a restricted reaction scope and unsatisfactory chirality induction. To address the constraints of monofunctional chiral crown ethers as cation-binding catalysts, it is therefore desirable to develop a cooperative cation-binding catalyst possessing secondary binding sites for anions, which enables the generation of a reactive anion within a chiral cage of a catalyst. This account summarizes our design, development, and applications of chiral BINOL-based oligoethylene glycols (oligoEGs) as a new type of bifunctional cation-binding catalyst. We initially found that achiral oligoEGs were efficient promoters in nucleophilic fluorination with potassium fluoride. Thereby, we hypothesized that, by breaking the closed cyclic ether unit of chiral crown ethers, the free terminal -OH groups could activate the electrophiles by hydrogen bonding whereas the ether oxygens could act as the Lewis base to coordinate metal ions, thus generating soluble anions in a confined chiral cage. This hypothesis was realized by synthesizing a series of chiral variants of oligoEGs by connecting two 3,3'-disubstituted-BINOL units with glycol linkers. Readily available BINOL-based chiral oligoEGs enabled numerous asymmetric transformations out of the reach of chiral monofunctional crown ether catalysts. We have demonstrated that this new type of bifunctional cation-binding catalysts can generate a soluble fluoride anion from alkali metal fluorides, which can be a versatile chiral promoter for diverse asymmetric catalytic reactions, kinetic resolution (selectivity factor of up to ∼2300), asymmetric protonation, Mannich reactions, tandem cyclization reactions, and the isomerization of allylic alcohols and hemithioacetals. We have also successfully utilized our chiral oligoEG catalysts along with alkali metal salts of carbon- and heteroatom-based nucleophiles, respectively, for asymmetric Strecker reactions and the asymmetric synthesis of chiral aminals. The power of our cooperative cation-binding catalysis was exemplified by kinetic resolution reactions of secondary alcohols, achieving highly enantioselective catalysis with only <1 ppm loading of an organocatalyst with high TOFs (up to ∼1300 h-1 at 1 ppm catalyst loading). The broadness and generality of our cooperative asymmetric cation-binding catalysis can be ascribed, in a similar fashion, to active-site architectures of enzymes using allosteric interactions, highly confined chiral cages formed by the incorporation of alkali metal salts in the catalyst polyether chain backbone, and the cooperative activation of reacting partners by hydrogen-bonding and ion-ion interactions. Confining reactive components in such a chiral binding pocket leads to enhanced reactivity and efficient transfer of the stereochemical information.
Collapse
Affiliation(s)
- Amol P. Jadhav
- Department of Chemistry, Sungkyunkwan University, Suwon, 440-746 Korea
| | - Sang Yeon Park
- Department of Chemistry, Sungkyunkwan University, Suwon, 440-746 Korea
| | - Ji-Woong Lee
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Hailong Yan
- Innovative Drug Research Centre, Chongqing University, Chongqing 401331, China
| | - Choong Eui Song
- Department of Chemistry, Sungkyunkwan University, Suwon, 440-746 Korea
| |
Collapse
|
7
|
Alberca S, Matador E, Iglesias-Sigüenza J, de Gracia Retamosa M, Fernández R, Lassaletta JM, Monge D. Asymmetric cross-aldol reactions of α-keto hydrazones and α,β-unsaturated γ-keto hydrazones with trifluoromethyl ketones. Chem Commun (Camb) 2021; 57:11835-11838. [PMID: 34698741 DOI: 10.1039/d1cc05014a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
α-Keto hydrazones and α,β-unsaturated γ-keto hydrazones are suitable pro-nucleophiles for asymmetric cross-aldol reactions with trifluoromethyl ketones via aza-di(tri)enamine-type intermediates. A quinidine-derived primary amine catalyst affords tertiary trifluoromethylated alcohols in good-to-excellent yields and high enantioselectivities. Subsequent transformations of hydrazono moieties yield appealing fluorinated carboxylic acids, 1,4-dicarbonyls and γ-keto acids.
Collapse
Affiliation(s)
- Saúl Alberca
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/Prof. García González, 1, 41012 Sevilla, Spain.
| | - Esteban Matador
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/Prof. García González, 1, 41012 Sevilla, Spain.
| | - Javier Iglesias-Sigüenza
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/Prof. García González, 1, 41012 Sevilla, Spain.
| | - Ma de Gracia Retamosa
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/Prof. García González, 1, 41012 Sevilla, Spain. .,Departamento de Química Orgánica e Instituto de Síntesis Orgánica, Universidad de Alicante, Centro de Innovación en Química Avanzada (ORFEO-CINQA), 03080-Alicante, Spain.
| | - Rosario Fernández
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/Prof. García González, 1, 41012 Sevilla, Spain.
| | - José M Lassaletta
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain.
| | - David Monge
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/Prof. García González, 1, 41012 Sevilla, Spain.
| |
Collapse
|
8
|
Yang X, Ma Y, Di H, Wang X, Jin H, Ryu DH, Zhang L. A Mild Method for Access to α‐Substituted Dithiomalonates through C‐Thiocarbonylation of Thioester: Synthesis of Mesoionic Insecticides. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xinyue Yang
- Institute of Functional Molecules Shenyang University of Chemical Technology National-Local Joint Engineering Laboratory for Development of Boron and Magnesium Resources and Fine Chemical Technology Liaoning Province Key Laboratory of Green Functional Molecular Design and Development Shenyang 110142 People's Republic of China
| | - Yanrong Ma
- Institute of Functional Molecules Shenyang University of Chemical Technology National-Local Joint Engineering Laboratory for Development of Boron and Magnesium Resources and Fine Chemical Technology Liaoning Province Key Laboratory of Green Functional Molecular Design and Development Shenyang 110142 People's Republic of China
| | - Huiming Di
- Institute of Functional Molecules Shenyang University of Chemical Technology National-Local Joint Engineering Laboratory for Development of Boron and Magnesium Resources and Fine Chemical Technology Liaoning Province Key Laboratory of Green Functional Molecular Design and Development Shenyang 110142 People's Republic of China
| | - Xiaochen Wang
- Institute of Functional Molecules Shenyang University of Chemical Technology National-Local Joint Engineering Laboratory for Development of Boron and Magnesium Resources and Fine Chemical Technology Liaoning Province Key Laboratory of Green Functional Molecular Design and Development Shenyang 110142 People's Republic of China
| | - Hui Jin
- Institute of Functional Molecules Shenyang University of Chemical Technology National-Local Joint Engineering Laboratory for Development of Boron and Magnesium Resources and Fine Chemical Technology Liaoning Province Key Laboratory of Green Functional Molecular Design and Development Shenyang 110142 People's Republic of China
| | - Do Hyun Ryu
- Department of Chemistry Sungkyunkwan University Suwon 440-746 Korea
| | - Lixin Zhang
- Institute of Functional Molecules Shenyang University of Chemical Technology National-Local Joint Engineering Laboratory for Development of Boron and Magnesium Resources and Fine Chemical Technology Liaoning Province Key Laboratory of Green Functional Molecular Design and Development Shenyang 110142 People's Republic of China
| |
Collapse
|
9
|
Xiao P, Pannecoucke X, Bouillon JP, Couve-Bonnaire S. Wonderful fusion of organofluorine chemistry and decarboxylation strategy. Chem Soc Rev 2021; 50:6094-6151. [PMID: 34027960 DOI: 10.1039/d1cs00216c] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Decarboxylation strategy has been emerging as a powerful tool for the synthesis of fluorine-containing organic compounds that play important roles in various fields such as pharmaceuticals, agrochemicals, and materials science. Considerable progress in decarboxylation has been made over the past decade towards the construction of diverse valuable fluorinated fine chemicals for which the fluorinated part can be brought in two ways. The first way is described as the reaction of non-fluorinated carboxylic acids (and their derivatives) with fluorinating reagents, as well as fluorine-containing building blocks. The second way is dedicated to the exploration and the use of fluorine-containing carboxylic acids (and their derivatives) in decarboxylative transformations. This review aims to provide a comprehensive summary of the development and applications of decarboxylative radical, nucleophilic and cross-coupling strategies in organofluorine chemistry.
Collapse
Affiliation(s)
- Pan Xiao
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000 Rouen, France.
| | - Xavier Pannecoucke
- Normandie Univ, INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000 Rouen, France.
| | | | | |
Collapse
|
10
|
Mg/BOX complexes as efficient catalysts for the enantioselective Michael addition of malonates to β-trifluoromethyl-α,β-unsaturated ketones and their N-tosyl imines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131897] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
11
|
Abstract
Decarboxylative addition reactions are well known as an effective approach to
C–C bonds formation due to the availability of starting reagents, ease of handling, and low
environmental impact. This approach clearly demonstrated its potential for the synthesis
of the variety of acyclic and heterocyclic compounds, including optically active ones. The
significant amount of articles devoted to this topic published in recent years proves the
importance of this approach in modern organic synthesis. In this review, the recent
achievements in decarboxylative addition to C=C, C=N, and C=O bonds have been summarized
and discussed over the last 6 years.
Collapse
Affiliation(s)
- Serhii Melnykov
- Institute of Organic Chemistry of the NAS of Ukraine, 5, Murmanska Str., Kyiv, Ukraine
| | - Volodymyr Sukach
- Institute of Organic Chemistry of the NAS of Ukraine, 5, Murmanska Str., Kyiv, Ukraine
| | - Mykhailo Vovk
- Institute of Organic Chemistry of the NAS of Ukraine, 5, Murmanska Str., Kyiv, Ukraine
| |
Collapse
|
12
|
Hyodo K, Nakamura S. Catalytic enantioselective decarboxylative nucleophilic addition reactions using chiral organocatalysts. Org Biomol Chem 2020; 18:2781-2792. [PMID: 32222743 DOI: 10.1039/d0ob00127a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic decarboxylative reactions are attractive as biomimetic and environmentally friendly reaction processes. This review summarizes the recent results of organocatalytic enantioselective decarboxylative reactions of malonic acid half oxy- or thioesters, β-ketoacids, and related compounds from October 2013 to December 2019.
Collapse
Affiliation(s)
- Kengo Hyodo
- Department of Chemistry, School of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Shuichi Nakamura
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.
| |
Collapse
|
13
|
Sperandio C, Rodriguez J, Quintard A. Development of copper-catalyzed enantioselective decarboxylative aldolization for the preparation of perfluorinated 1,3,5-triols featuring supramolecular recognition properties. Chem Sci 2020; 11:1629-1635. [PMID: 32206281 PMCID: PMC7069514 DOI: 10.1039/c9sc05196a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 12/17/2019] [Indexed: 01/09/2023] Open
Abstract
Fluorine is able to confer unique properties to organic molecules but the scarcity of natural organofluorine sources renders the development of new synthetic methods highly desirable. Using a chiral BOX/Cu combination, enantioselective decarboxylative aldolization of perfluorinated aldehydes has been developed. Most notably, the reaction occurring under mild conditions and with high enantiocontrol can create ketodiols in one single synthetic operation, which are precursors of crucial perfluorinated 1,3,5-triols. In addition, the reaction performed with chloral, validates the proposed transition state model based on steric interactions and provides the first enantioselective synthesis of hexachlorinated ketodiol of great synthetic utility. The ability of perfluorinated 1,3,5-triols to form a central hydrogen-bonding framework allows strong coordination of anions and the chirality obtained through the catalyst-controlled synthetic sequence demonstrates the selective chiral anion recognition ability of polyols.
Collapse
Affiliation(s)
- Céline Sperandio
- Aix Marseille Univ , CNRS , Centrale Marseille , iSm2 , Marseille , France . ; http://ism2.univ-amu.fr/fr/annuaire/stereo/quintardadrien
| | - Jean Rodriguez
- Aix Marseille Univ , CNRS , Centrale Marseille , iSm2 , Marseille , France . ; http://ism2.univ-amu.fr/fr/annuaire/stereo/quintardadrien
| | - Adrien Quintard
- Aix Marseille Univ , CNRS , Centrale Marseille , iSm2 , Marseille , France . ; http://ism2.univ-amu.fr/fr/annuaire/stereo/quintardadrien
| |
Collapse
|
14
|
Zhang D, Chen Y, Cai H, Yin L, Zhong J, Man J, Zhang QF, Bethi V, Tanaka F. Direct Catalytic Asymmetric Synthesis of Oxindole-Derived δ-Hydroxy-β-ketoesters by Aldol Reactions. Org Lett 2020; 22:6-10. [PMID: 31746616 DOI: 10.1021/acs.orglett.9b03527] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Direct asymmetric synthesis of δ-hydroxy-β-ketoesters was accomplished via regio- and enantioselective aldol reactions of β-ketoesters with isatins catalyzed by cinchona alkaloid thiourea derivatives. The C-C bond formation of the reactions occurred only at the γ-position of the β-ketoesters. Reaction progress monitoring and product stability analyses under the conditions that included the catalyst indicated that the γ-position reaction products were formed kinetically. Various δ-hydroxy-β-ketoesters bearing 3-alkyl-3-hydroxyoxindole cores relevant to the development of bioactive molecules were synthesized.
Collapse
Affiliation(s)
- Dongxin Zhang
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Yan Chen
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Hu Cai
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Lei Yin
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Junchao Zhong
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Jingjing Man
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Qian-Feng Zhang
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Venkati Bethi
- Chemistry and Chemical Bioengineering Unit , Okinawa Institute of Science and Technology Graduate University , 1919-1 Tancha , Onna , Okinawa 904-0495 , Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit , Okinawa Institute of Science and Technology Graduate University , 1919-1 Tancha , Onna , Okinawa 904-0495 , Japan
| |
Collapse
|