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Le TM, Njangiru IK, Vincze A, Zupkó I, Balogh GT, Szakonyi Z. Synthesis and medicinal chemical characterisation of antiproliferative O, N-functionalised isopulegol derivatives. RSC Adv 2024; 14:18508-18518. [PMID: 38867736 PMCID: PMC11168086 DOI: 10.1039/d4ra03467h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Accepted: 06/02/2024] [Indexed: 06/14/2024] Open
Abstract
Benzylation of isopulegol furnished O-benzyl-protected isopulegol, which was transformed into aminodiols via epoxidation followed by ring opening of the corresponding epoxides and subsequent hydrogenolysis. On the other hand, (-)-isopulegol was oxidised to a diol, which was then converted into dibenzyl-protected diol derivatives. The products were then transformed into aminotriols by using a similar method. The antiproliferative activity of aminodiol and aminotriol derivatives was examined. In addition, structure-activity relationships were also explored from the aspects of substituent effects and stereochemistry on the aminodiol and aminotriol systems. The drug-likeness of the compounds was assessed by in silico and experimental physicochemical characterisations, completed by kinetic aqueous solubility and in vitro intestinal-specific parallel artificial membrane permeability assay (PAMPA-GI) measurements.
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Affiliation(s)
- Tam Minh Le
- Institute of Pharmaceutical Chemistry, University of Szeged Eötvös utca 6 H-6720 Szeged Hungary +36 62 545705 +36 62 546809
- HUN-REN-SZTE Stereochemistry, Research Group, University of Szeged Eötvös u. 6 H-6720 Szeged Hungary
| | - Isaac Kinyua Njangiru
- Institute of Pharmacodynamics and Biopharmacy, University of Szeged H-6720 Eötvös utca 6 Szeged Hungary
| | - Anna Vincze
- Department of Pharmaceutical Chemistry, Semmelweis University Hőgyes Endre u. 9 H-1092 Budapest Hungary
| | - István Zupkó
- Institute of Pharmacodynamics and Biopharmacy, University of Szeged H-6720 Eötvös utca 6 Szeged Hungary
| | - György T Balogh
- Department of Pharmaceutical Chemistry, Semmelweis University Hőgyes Endre u. 9 H-1092 Budapest Hungary
| | - Zsolt Szakonyi
- Institute of Pharmaceutical Chemistry, University of Szeged Eötvös utca 6 H-6720 Szeged Hungary +36 62 545705 +36 62 546809
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2
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Hans AC, Becker PM, Haußmann J, Suhr S, Wanner DM, Lederer V, Willig F, Frey W, Sarkar B, Kästner J, Peters R. A Practical and Robust Zwitterionic Cooperative Lewis Acid/Acetate/Benzimidazolium Catalyst for Direct 1,4-Additions. Angew Chem Int Ed Engl 2023; 62:e202217519. [PMID: 36651714 DOI: 10.1002/anie.202217519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 01/19/2023]
Abstract
A catalyst type is disclosed allowing for exceptional efficiency in direct 1,4-additions. The catalyst is a zwitterionic entity, in which acetate binds to CuII , which is formally negatively charged and serving as counterion for benzimidazolium. All 3 functionalities are involved in the catalytic activation. For maleimides productivity was increased by a factor >300 compared to literature (TONs up to 6700). High stereoselectivity and productivity was attained for a broad range of other Michael acceptors as well. The polyfunctional catalyst is accessible in only 4 steps from N-Ph-benzimidazole with an overall yield of 96 % and robust during catalysis. This allowed to reuse the same catalyst multiple times with nearly constant efficiency. Mechanistic studies, in particular by DFT, give a detailed picture how the catalyst operates. The benzimidazolium unit stabilizes the coordinated enolate nucleophile and prevents that acetate/acetic acid dissociate from the catalyst.
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Affiliation(s)
- Andreas C Hans
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Patrick M Becker
- Universität Stuttgart, Institut für Theoretische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Johanna Haußmann
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Simon Suhr
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Daniel M Wanner
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Vera Lederer
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Felix Willig
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Wolfgang Frey
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Biprajit Sarkar
- Universität Stuttgart, Institut für Anorganische 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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3
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Padilla-Martínez II, Cruz A, García-Báez EV, Rosales-Hernández MC, Mendieta Wejebe JE. N-substitution Reactions of 2-Aminobenzimidazoles to Access Pharmacophores. Curr Org Synth 2023; 20:177-219. [PMID: 35272598 DOI: 10.2174/1570179419666220310124223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/22/2021] [Accepted: 12/31/2021] [Indexed: 11/22/2022]
Abstract
Benzimidazole (BI) and its derivatives are interesting molecules in medicinal chemistry because several of these compounds have a diversity of biological activities and some of them are even used in clinical applications. In view of the importance of these compounds, synthetic chemists are still interested in finding new procedures for the synthesis of these classes of compounds. Astemizole (antihistaminic), Omeprazole (antiulcerative), and Rabendazole (fungicide) are important examples of compounds used in medicinal chemistry containing BI nuclei. It is interesting to observe that several of these compounds contain 2-aminobenzimidazole (2ABI) as the base nucleus. The structures of 2ABI derivatives are interesting because they have a planar delocalized structure with a cyclic guanidine group, which have three nitrogen atoms with free lone pairs and labile hydrogen atoms. The 10-π electron system of the aromatic BI ring conjugated with the nitrogen lone pair of the hexocyclic amino group, making these heterocycles to have an amphoteric character. Synthetic chemists have used 2ABI as a building block to produce BI derivatives as medicinally important molecules. In view of the importance of the BIs, and because no review was found in the literature about this topic, we reviewed and summarized the procedures related to the recent methodologies used in the N-substitution reactions of 2ABIs by using aliphatic and aromatic halogenides, dihalogenides, acid chlorides, alkylsulfonic chlorides, carboxylic acids, esters, ethyl chloroformates, anhydrides, SMe-isothioureas, alcohols, alkyl cyanates, thiocyanates, carbon disulfide and aldehydes or ketones to form Schiff bases. The use of diazotized 2ABI as intermediate to obtain 2-diazoBIs was included to produce Nsubstituted 2ABIs of pharmacological interest. Some commentaries about their biological activity were included.
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Affiliation(s)
- Itzia I Padilla-Martínez
- Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional UPIBI, Av. Acueducto s/n, Barrio la Laguna Ticomán, Ciudad de México, 07340, Mexico
| | - Alejandro Cruz
- Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional UPIBI, Av. Acueducto s/n, Barrio la Laguna Ticomán, Ciudad de México, 07340, Mexico
| | - Efrén V García-Báez
- Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional UPIBI, Av. Acueducto s/n, Barrio la Laguna Ticomán, Ciudad de México, 07340, Mexico
| | - Martha C Rosales-Hernández
- Laboratorio de Biofísica y Biocatálisis, Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Salvador Díaz Mirón s/n, Casco de Santo Tomás, Distrito Federal 11340, México
| | - Jessica E Mendieta Wejebe
- Laboratorio de Biofísica y Biocatálisis, Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Salvador Díaz Mirón s/n, Casco de Santo Tomás, Distrito Federal 11340, México
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4
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β-Amino Acid Organocatalysts in the Asymmetric Michael Addition of Isobutyraldehyde to N-Substituted Maleimides. Catalysts 2022. [DOI: 10.3390/catal12090992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Asymmetric Michael additions of carbonyl compounds to N-substituted maleimides are among the most convenient reactions to prepare optically pure succinimide building blocks. Although a few β-amino acids were found to be highly efficient organocatalysts in the addition of α-branched aldehydes, the effect of their structure on the results of these reactions has not yet been investigated. In the present study, we disclose several unexpected and interesting structural effects of aliphatic and cycloaliphatic β-amino acids obtained in the enantioselective conjugate addition of isobutyraldehyde to N-benzylmaleimide. The dependence of the sense of the enantioselectivity on the bulkiness of the substituent on the β-carbon atom, the beneficial spatial arrangements of the functional groups in cis isomers with cyclohexane scaffold and the inversion of the enantioselectivity depending on the absence of a base additive observed with some trans isomers are unprecedented findings. The minor influence of the nitrogen substituent of the maleimide ring on both the reaction rate and the enantioselectivity was also evidenced using alicyclic β-amino acid prepared from an easily available terpene derivative.
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5
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Kozma V, Szőllősi G. Conjugate addition of 1,3-dicarbonyl compounds to maleimides using bifunctional primary amine‒(thio)phosphoramide organocatalysts. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2021.112089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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6
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Kozma V, Szőllősi G. Enantioselective Michael addition of aldehydes to maleimides catalysed by surface-adsorbed natural amino acids. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00545j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Chiral hybrid materials obtained by adsorption of primary α-amino acids on the surface of inorganic oxides are economic, recyclable, highly enantioselective heterogeneous catalysts for the Michael addition of aldehydes to N-substituted maleimides.
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Affiliation(s)
- Viktória Kozma
- Department of Organic Chemistry, University of Szeged, 6720 Szeged, Dóm tér 8, Hungary
| | - György Szőllősi
- SZTE-ELKH Stereochemistry Research Group, University of Szeged, 6720 Szeged, Eötvös utca 6, Hungary
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7
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Alonso DA, Burlingham S, Chinchilla R, Guillena G, Ramón DJ, Tiecco M. Asymmetric Organocatalysis in Deep Eutectic Solvents. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100385] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Diego A. Alonso
- Organic Chemistry Department and Organic Synthesis Institute Alicante University P.O. Box 99 03080 Alicante Spain
| | - Sarah‐Jayne Burlingham
- Organic Chemistry Department and Organic Synthesis Institute Alicante University P.O. Box 99 03080 Alicante Spain
| | - Rafael Chinchilla
- Organic Chemistry Department and Organic Synthesis Institute Alicante University P.O. Box 99 03080 Alicante Spain
| | - Gabriela Guillena
- Organic Chemistry Department and Organic Synthesis Institute Alicante University P.O. Box 99 03080 Alicante Spain
| | - Diego J. Ramón
- Organic Chemistry Department and Organic Synthesis Institute Alicante University P.O. Box 99 03080 Alicante Spain
| | - Matteo Tiecco
- Department of Chemistry, Biology and Biotechnology Università degli Studi di Perugia Via Elce di Sotto 8 06124 Perugia Italy
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8
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Abstract
Easily accessible racemic N-Boc-isoxazolidine-5-ones undergo enantioselective alcoholysis promoted by double hydrogen bond donor amine organocatalysts, resulting in their effective kinetic resolution.
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Affiliation(s)
- Matthew R Straub
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, One Brookings Drive, St. Louis, Missouri 63130, United States
| | - Vladimir B Birman
- Department of Chemistry, Washington University in St. Louis, Campus Box 1134, One Brookings Drive, St. Louis, Missouri 63130, United States
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9
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Du ZH, Qin WJ, Tao BX, Yuan M, Da CS. N-Primary-amine tetrapeptide-catalyzed highly asymmetric Michael addition of aliphatic aldehydes to maleimides. Org Biomol Chem 2020; 18:6899-6904. [PMID: 32856662 DOI: 10.1039/d0ob01457e] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
The highly asymmetric Michael addition reaction between maleimides and aliphatic aldehydes catalyzed by low-loading β-turn tetrapeptides with excellent yields and enantioselectivities at room temperature was reported. α-Branched and α-unbranched aldehydes both are suitable nucleophiles. N-Aryl, alkyl and hydrogen maleimides all are well tolerated and led to high yields and enantioselectivities. The transformation can be enlarged to the gram scale without decrease in the yield and enantioselectivity. Furthermore, the succinimides were converted into γ-lactams and γ-lactones, showing good practicality of this work. Some reaction intermediates in the proposed reaction mechanism can be captured with the HR-MS method.
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Affiliation(s)
- Zhi-Hong Du
- Institute of Biochemistry and Molecular Biology, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
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10
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Al-Taie ZS, Anetts SR, Christensen J, Coles SJ, Horton PN, Evans DM, Jones LF, de Kleijne FFJ, Ledbetter SM, Mehdar YTH, Murphy PJ, Wilson JA. Proline derived guanidine catalysts forge extensive H-bonded architectures: a solution and solid state study. RSC Adv 2020; 10:22397-22416. [PMID: 35514555 PMCID: PMC9054603 DOI: 10.1039/c9ra07508a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 02/25/2020] [Indexed: 11/21/2022] Open
Abstract
The preparation of a range of amino acid derived guanidine organocatalysts is reported together with their application to the Michael addition of 2-hydroxy-1,4-napthoquinone to β-nitrostyrene, achieving a maximum ee of 56%. Some insight into the mechanism was sought by using X-ray crystallography and a detailed study of the intra- and intermolecular hydrogen bonding is reported. Catalysts assemble! We present the design and synthesis of a large family of amino acid derived guanidine organic moieties as catalysts in the solution state and building blocks towards extended H-bonded architectures upon crystallisation.![]()
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Affiliation(s)
- Zahraa S. Al-Taie
- Department of Chemistry
- College of Science
- Al-Nahrain University
- Baghdad
- Iraq
| | - Simon R. Anetts
- School of Natural Sciences (Chemistry)
- Bangor University
- Bangor
- UK
| | - Jeppe Christensen
- Diamond Light Source
- Didcot
- UK
- EPSRC National Crystallography Service
- School of Chemistry
| | - Simon J. Coles
- EPSRC National Crystallography Service
- School of Chemistry
- University of Southampton
- Southampton
- UK
| | - Peter N. Horton
- EPSRC National Crystallography Service
- School of Chemistry
- University of Southampton
- Southampton
- UK
| | - Daniel M. Evans
- School of Natural Sciences (Chemistry)
- Bangor University
- Bangor
- UK
| | - Leigh F. Jones
- School of Biological, Physical and Forensic Sciences
- University of Wolverhampton
- UK
| | | | | | | | | | - Jack A. Wilson
- School of Natural Sciences (Chemistry)
- Bangor University
- Bangor
- UK
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11
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Ray B, Mukherjee S. Catalytic enantioselective Michael addition of deconjugated butyrolactams to maleimides. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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12
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Sakamoto M, Kaneko T, Orito Y, Shimoda Y, Nakajima M. Lithium Binaphtholate-Catalyzed Michael Reaction of Malonates with Maleates and Its Application to the Enantioselective Synthesis of Tricarboxylic Acid Derivatives. Chem Pharm Bull (Tokyo) 2019; 67:452-460. [PMID: 31061370 DOI: 10.1248/cpb.c18-00993] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The Michael reaction of malonates with maleates afforded the corresponding adducts in high yields with high enantioselectivities (up to 98% enantiomeric excess (ee)) by using dilithium 3,3'-dichlorobinaphtholate as a catalyst. The obtained Michael adducts could be converted to optically active tricarboxylic acid (TCA) derivatives via the Krapcho reaction.
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Affiliation(s)
- Midori Sakamoto
- Graduate School of Pharmaceutical Sciences, Kumamoto University
| | - Tetsuya Kaneko
- Graduate School of Pharmaceutical Sciences, Kumamoto University
| | - Yuya Orito
- Graduate School of Pharmaceutical Sciences, Kumamoto University
| | - Yasushi Shimoda
- Graduate School of Pharmaceutical Sciences, Kumamoto University
| | - Makoto Nakajima
- Graduate School of Pharmaceutical Sciences, Kumamoto University
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13
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Сhiral and Racemic Fields Concept for Understanding of the Homochirality Origin, Asymmetric Catalysis, Chiral Superstructure Formation from Achiral Molecules, and B-Z DNA Conformational Transition. Symmetry (Basel) 2019. [DOI: 10.3390/sym11050649] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The four most important and well-studied phenomena of mirror symmetry breaking of molecules were analyzed for the first time in terms of available common features and regularities. Mirror symmetry breaking of the primary origin of biological homochirality requires the involvement of an external chiral inductor (environmental chirality). All reviewed mirror symmetry breaking phenomena were considered from that standpoint. A concept of chiral and racemic fields was highly helpful in this analysis. A chiral gravitational field in combination with a static magnetic field (Earth’s environmental conditions) may be regarded as a hypothetical long-term chiral inductor. Experimental evidences suggest a possible effect of the environmental chiral inductor as a chiral trigger on the mirror symmetry breaking effect. Also, this effect explains a conformational transition of the right-handed double DNA helix to the left-handed double DNA helix (B-Z DNA transition) as possible DNA damage.
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14
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Tehri P, Peddinti RK. DBU-catalyzed [3 + 2] cycloaddition and Michael addition reactions of 3-benzylidene succinimides with 3-ylidene oxindoles and chalcones. Org Biomol Chem 2019; 17:3964-3970. [PMID: 30942810 DOI: 10.1039/c9ob00385a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A metal-free DBU catalyzed protocol has been developed for the regioselective [3 + 2] cycloaddition reactions of 3-benzylidene succinimides with 3-ylidene oxindoles to furnish spirooxindole derivatives. The 3-benzylidene succinimides underwent Michael addition with chalcones to provide benzylidene succinimide-tethered propanones. All the reactions proceeded under mild conditions and the products were isolated by simple filtration and washing with ethanol in good yields. The current methodology utilizes simple precursors and provides functionally-rich succinimides with two to five contiguous stereocenters in excellent diastereoselectivity and with complete regioselectivity.
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Affiliation(s)
- Piyush Tehri
- Department of Chemistry, Indian Institute of Technology, Roorkee-247667, Uttarakhand, India.
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15
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Benavent L, Baeza A, Freckleton M. Chiral 2-Aminobenzimidazole as Bifunctional Catalyst in the Asymmetric Electrophilic Amination of Unprotected 3-Substituted Oxindoles. Molecules 2018; 23:molecules23061374. [PMID: 29882840 PMCID: PMC6099788 DOI: 10.3390/molecules23061374] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 06/04/2018] [Accepted: 06/05/2018] [Indexed: 11/17/2022] Open
Abstract
The use of readily available chiral trans-cyclohexanediamine-benzimidazole derivatives as bifunctional organocatalysts in the asymmetric electrophilic amination of unprotected 3-substituted oxindoles is presented. Different organocatalysts were evaluated; the most successful one contained a dimethylamino moiety (5). With this catalyst under optimized conditions, different oxindoles containing a wide variety of substituents at the 3-position were aminated in good yields and with good to excellent enantioselectivities using di-tert-butylazodicarboxylate as the aminating agent. The procedure proved to be also efficient for the amination of 3-substituted benzofuranones, although with moderate results. A bifunctional role of the catalyst, acting as Brønsted base and hydrogen bond donor, is proposed according to the experimental results observed.
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Affiliation(s)
- Llorenç Benavent
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
| | - Alejandro Baeza
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
| | - Megan Freckleton
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
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16
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Deep Eutectic Mixtures as Reaction Media for the Enantioselective Organocatalyzed α-Amination of 1,3-Dicarbonyl Compounds. Catalysts 2018. [DOI: 10.3390/catal8050217] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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17
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Yarlagadda S, Reddy CR, Ramesh B, Kumar GR, Sridhar B, Reddy BVS. Organocatalytic Enantioselective Michael Addition of 3-Indolinone-2-Carboxylates to Maleimides. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701670] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Suresh Yarlagadda
- Centre for Semiochemicals; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad - India
| | - C. Ravikumar Reddy
- Centre for Semiochemicals; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad - India
| | - Boora Ramesh
- Centre for Semiochemicals; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad - India
| | - G. Ravi Kumar
- Centre for Semiochemicals; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad - India
| | - B. Sridhar
- Laboratory of X-ray Crystallography; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad - India
| | - B. V. Subba Reddy
- Centre for Semiochemicals; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad - India
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18
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Benavent L, Puccetti F, Baeza A, Gómez-Martínez M. Readily Available Chiral Benzimidazoles-Derived Guanidines as Organocatalysts in the Asymmetric α-Amination of 1,3-Dicarbonyl Compounds. Molecules 2017; 22:molecules22081333. [PMID: 28800100 PMCID: PMC6152235 DOI: 10.3390/molecules22081333] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 08/07/2017] [Accepted: 08/09/2017] [Indexed: 11/24/2022] Open
Abstract
The synthesis and the evaluation as organocatalysts of new chiral guanidines derived from benzimidazoles in the enantioselective α-amination of 1,3-dicarbonyl compounds using di-t-butylazodicarboxylate as aminating agent is herein disclosed. The catalysts are readily synthesized through the reaction of 2-chlorobezimidazole and a chiral amine in moderate-to-good yields. Among all of them, those derived from (R)-1-phenylethan-1-amine (1) and (S)-1-(2-naphthyl)ethan-1-amine (3) turned out to be the most efficient for such asymmetric transformation, rendering good-to-high yields and moderate-to-good enantioselectivities for the amination products.
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Affiliation(s)
- Llorenç Benavent
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
| | - Francesco Puccetti
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
| | - Alejandro Baeza
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
| | - Melania Gómez-Martínez
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, E-03080 Alicante, Spain.
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Ghannay S, Bakari S, Ghabi A, Kadri A, Msaddek M, Aouadi K. Stereoselective synthesis of enantiopure N -substituted pyrrolidin-2,5-dione derivatives by 1,3-dipolar cycloaddition and assessment of their in vitro antioxidant and antibacterial activities. Bioorg Med Chem Lett 2017; 27:2302-2307. [DOI: 10.1016/j.bmcl.2017.04.044] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 04/10/2017] [Accepted: 04/12/2017] [Indexed: 12/12/2022]
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Dana S, Mandal A, Sahoo H, Baidya M. Ru(II)-Catalyzed C–H Functionalization on Maleimides with Electrophiles: A Demonstration of Umpolung Strategy. Org Lett 2017; 19:1902-1905. [DOI: 10.1021/acs.orglett.7b00674] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Suman Dana
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| | - Anup Mandal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| | - Harekrishna Sahoo
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| | - Mahiuddin Baidya
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
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Yarie M, Ali Zolfigol M, Baghery S, Alonso DA, Khoshnood A, Kalhor M, Bayat Y, Asgari A. Design and preparation of [4,4′-bipyridine]-1,1′-diium trinitromethanide (BPDTNM) as a novel nanosized ionic liquid catalyst: application to the synthesis of 1-(benzoimidazolylamino)methyl-2-naphthols. NEW J CHEM 2017. [DOI: 10.1039/c6nj04074h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A novel bifunctional nanosized molten salt catalyst promoted the synthesis of 1-(benzoimidazolylamino)methyl-2-naphthols.
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Affiliation(s)
- Meysam Yarie
- Department of Organic Chemistry
- Faculty of Chemistry
- Bu-Ali Sina University
- Hamedan 6517838683
- Iran
| | - Mohammad Ali Zolfigol
- Department of Organic Chemistry
- Faculty of Chemistry
- Bu-Ali Sina University
- Hamedan 6517838683
- Iran
| | - Saeed Baghery
- Department of Organic Chemistry
- Faculty of Chemistry
- Bu-Ali Sina University
- Hamedan 6517838683
- Iran
| | - Diego A. Alonso
- Organic Synthesis Institute and Organic Chemistry Department
- Alicante University
- 03080 Alicante
- Spain
| | - Abbas Khoshnood
- Organic Synthesis Institute and Organic Chemistry Department
- Alicante University
- 03080 Alicante
- Spain
| | - Mehdi Kalhor
- Department of Chemistry
- Payame Noor University
- Tehran 19395-4697
- Iran
| | - Yadollah Bayat
- Faculty of Chemistry and Chemical Engineering
- Malek Ashtar University of Technology
- Tehran
- Iran
| | - Asiye Asgari
- Faculty of Chemistry and Chemical Engineering
- Malek Ashtar University of Technology
- Tehran
- Iran
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22
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Stereoselective conjugate addition of carbonyl compounds to maleimides using a diaminomethyleneindenedione organocatalyst. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.tetasy.2016.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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23
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Nájera C, Miguel Sansano J, Gómez-Bengoa E. Heterocycle-based bifunctional organocatalysts in asymmetric synthesis. PURE APPL CHEM 2016. [DOI: 10.1515/pac-2016-0403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
AbstractDifferent chiral bifunctional organocatalysts derived from trans-cyclohexane-1,2-diamine bearing different types of guanidine units able to form-hydrogen bonding activation have been designed. Conformational rigid 2-aminobenzimidazoles bearing a tertiary amino group have been used in enantioselective Michael type reactions of activated methylene compounds to nitroalkenes. The C2 symmetric bis(2-aminobenzimidazole) derivatives the appropriate organocatalyst for the conjugate addition of 1,3-dicarbonyl compounds to maleimides as well as for the SN1 reaction of benzylic alcohols with carbon nucleophiles. 2-Aminobenzimidazoles bearing a primary amino group have shown excellent catalytic activity in the Michael reaction of aldehydes to maleimides and nitroalkenes. Diastereomeric 2-aminopyrimidines bearing a prolinamide unit have been incorporated in the trans-cyclohexane-1,2-diamine scaffold and have been used for the inter- and intra-molecular direct aldol reaction under solvent-free conditions. For the Michael reaction of aldehydes with maleimides the primary amine 2-aminopyrimidine has shown excellent efficiency as organocatalyst. The bifunctional character of these organocatalysts has been demonstrated by means of DFT calculations.
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Affiliation(s)
- Carmen Nájera
- 1Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - José Miguel Sansano
- 1Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - Enrique Gómez-Bengoa
- 2Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco, Apdo. 1072, E-20018 San Sebastián, Spain
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Bifunctional primary amine 2-aminobenzimidazole organocatalyst anchored to trans-cyclohexane-1,2-diamine in enantioselective conjugate additions of aldehydes. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.tetasy.2015.12.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Rong C, Pan H, Liu M, Tian H, Shi Y. A Facile Approach to Optically Active Hydroquinoline-2-carboxylates by a One-Pot Asymmetric Michael/Transamination/Cyclization Process. Chemistry 2016; 22:2887-91. [DOI: 10.1002/chem.201503327] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Chao Rong
- Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Molecular Recognition and Function; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
| | - Hongjie Pan
- Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Molecular Recognition and Function; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
| | - Mao Liu
- Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Molecular Recognition and Function; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
| | - Hua Tian
- Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Molecular Recognition and Function; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
| | - Yian Shi
- Beijing National Laboratory for Molecular Sciences; CAS Key Laboratory of Molecular Recognition and Function; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
- Department of Chemistry; Colorado State University; Fort Collins Colorado 80523 USA
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Organocatalytic Asymmetric α-Chlorination of 1,3-Dicarbonyl Compounds Catalyzed by 2-Aminobenzimidazole Derivatives. Symmetry (Basel) 2016. [DOI: 10.3390/sym8010003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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Allingham MT, Bennett EL, Davies DH, Harper PM, Howard-Jones A, Mehdar YT, Murphy PJ, Thomas DA, Caulkett PW, Potter D, Lam CM, O'Donoghue AC. Synthesis, applications and mechanistic investigations of C2 symmetric guanidinium salts. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.11.058] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Molleti N, Bjornberg C, Kang JY. Phospha-Michael addition reaction of maleimides employing N-heterocyclic phosphine-thiourea as a phosphonylation reagent: synthesis of 1-aryl-2,5-dioxopyrrolidine-3-yl-phosphonate derivatives. Org Biomol Chem 2016; 14:10695-10704. [DOI: 10.1039/c6ob01987k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The phospha-Michael addition reaction of maleimides with NHP-thiourea under catalyst and additive free conditions has been developed for desymmetrization of maleimides.
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Affiliation(s)
- Nagaraju Molleti
- Department of Chemistry and Biochemistry
- University of Nevada Las Vegas
- Las Vegas
- USA
| | - Chad Bjornberg
- Department of Chemistry and Biochemistry
- University of Nevada Las Vegas
- Las Vegas
- USA
| | - Jun Yong Kang
- Department of Chemistry and Biochemistry
- University of Nevada Las Vegas
- Las Vegas
- USA
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Zlotin SG, Kochetkov SV. C2-Symmetric diamines and their derivatives as promising organocatalysts for asymmetric synthesis. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4562] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Shokova EA, Kim JK, Kovalev VV. 1,3-Diketones. Synthesis and properties. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2015. [DOI: 10.1134/s1070428015060019] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Sadiq A, Mahmood F, Ullah F, Ayaz M, Ahmad S, Haq FU, Khan G, Jan MS. Synthesis, anticholinesterase and antioxidant potentials of ketoesters derivatives of succinimides: a possible role in the management of Alzheimer's. Chem Cent J 2015; 9:31. [PMID: 26064188 PMCID: PMC4461796 DOI: 10.1186/s13065-015-0107-2] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/15/2015] [Indexed: 12/01/2022] Open
Abstract
Background Based on the pharmacological potency and structural features of succinimides, this study was designed to synthesize new ketoesters derivatives of succinimides. Furthermore, the synthesized compounds were evaluated for their possible anticholinesterase and antioxidant potentials. The compounds were synthesized by organocatalytic Michael additions of α-ketoesters to N-aryl maleimides. Acetyl and butyrylcholinesterase inhibitory activities were determined using Ellman’s spectrophotometric assay. The antioxidant activity was performed with DPPH and ABTS free radicals scavenging assay. Results The Michael additions of α-ketoesters to maleimides was promoted by 8-hydroxyquinoline. The organocatalyst (8-hydroxyquinoline, 20 mol %) produced the compounds in relatively shorter time (20–24 h) and with excellent isolated yields (84-98 %). The synthesized compounds (1–4) showed outstanding acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitory potentials, i.e., 98.75 and 90.00 % respectively for compound 2, with IC50 < 0.1 μg/mL. Additionally, compounds 1–4 revealed moderate antioxidant activity at different concentrations. In DPPH free radical scavenging assay, compound 1 showed dominant result with 72.41 ± 0.45, 52.49 ± 0.78 and 35.60 ± 0.75 % inhibition at concentrations of 1000, 500 and 250 μg/mL respectively, IC50 value of 440 μg/mL. However, the free radical scavenging was better when used ABTS free radicals. In ABTS free radicals scavenging assay compound 1 exhibited 88.51 ± 0.62 % inhibition at highest tested concentration i.e., 1000 μg/mL. Conclusions Herein, we have synthesized four ketoesters derivatives of succinimides in a single step reaction and high yields. As a highlight, we have showed a first report on the anticholinesterase and antioxidant potentials of succinimides. All the compounds showed overwhelming enzyme inhibitions and moderate antioxidant potentials. Graphical representation of synthesis, anticholinesterase and antioxidant potentials of ketoester derivatives of succinimides. ![]()
Electronic supplementary material The online version of this article (doi:10.1186/s13065-015-0107-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Abdul Sadiq
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan
| | - Fawad Mahmood
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan ; Department of Pharmacy, Sarhad University of Science and Information Technology, Peshawar, KPK Pakistan
| | - Farhat Ullah
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan
| | - Muhammad Ayaz
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan
| | - Sajjad Ahmad
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan
| | - Faizan Ul Haq
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan
| | - Ghazan Khan
- Department of Pharmacy, University of Malakand, Chakdara, Dir Pakistan
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Valdivielso ÁM, Catot A, Alfonso I, Jimeno C. Intramolecular hydrogen bonding guides a cationic amphiphilic organocatalyst to highly stereoselective aldol reactions in water. RSC Adv 2015. [DOI: 10.1039/c5ra12135c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel amphiphilic acylguanidine organocatalyst using intramolecular hydrogen bonding as a key structural motif is efficient for asymmetric aldol reactions of ketones in water at neutral pH.
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Affiliation(s)
- Ángel M. Valdivielso
- Department of Biological Chemistry and Molecular Modelling
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC)
- E08034 Barcelona
- Spain
| | - Alba Catot
- Department of Biological Chemistry and Molecular Modelling
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC)
- E08034 Barcelona
- Spain
| | - Ignacio Alfonso
- Department of Biological Chemistry and Molecular Modelling
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC)
- E08034 Barcelona
- Spain
| | - Ciril Jimeno
- Department of Biological Chemistry and Molecular Modelling
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC)
- E08034 Barcelona
- Spain
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Zhang AL, Yang LW, Yang NF, Liu DC. Investigation of catalytic activity and catalytic mechanism of chiral amino diol tridentate ligands in the asymmetric addition of aldehydes in the present of methyllithium reagent. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.06.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Guo W, Wei J, Liu Y, Li C. Construction of anti-1,2-diols bearing chiral tertiary alcohol moiety using free hydroxyacetone as aldol donor by imidazole-based prolineamide catalyst. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.07.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yoshida M, Kubara A, Nagasawa Y, Hara S, Yamanaka M. Asymmetric Michael Addition of β-Ketoesters to Enones Catalyzed by the Lithium Salt of a Primary β-Amino Acid. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201400024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chen F, Lei M, Hu L. Thiamine hydrochloride (VB1)-catalyzed one-pot synthesis of (E)-N-benzylidene-2-phenyl-1H-benzo[d]imidazo[1,2-a]imidazol-3-amine derivatives. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.02.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Guo YL, Jia LN, Peng L, Qi LW, Zhou J, Tian F, Xu XY, Wang LX. Highly enantioselective direct vinylogous Michael addition of γ-substituted deconjugated butenolides to maleimides catalyzed by chiral squaramides. RSC Adv 2013. [DOI: 10.1039/c3ra43344g] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Thiourea-catalyzed asymmetric conjugate addition of α-substituted cyanoacetates to maleimides. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2012.11.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Avila A, Chinchilla R, Nájera C. Enantioselective Michael addition of α,α-disubstituted aldehydes to maleimides organocatalyzed by chiral primary amine-guanidines. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.11.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Manna MS, Mukherjee S. Catalytic Asymmetric Direct Vinylogous Michael Addition of Deconjugated Butenolides to Maleimides for the Construction of Quaternary Stereogenic Centers. Chemistry 2012; 18:15277-82. [DOI: 10.1002/chem.201203180] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 10/11/2012] [Indexed: 11/06/2022]
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Gómez-Torres E, Alonso DA, Gómez-Bengoa E, Nájera C. Enantioselective Synthesis of Succinimides by Michael Addition of 1,3-Dicarbonyl Compounds to Maleimides Catalyzed by a Chiral Bis(2-aminobenzimidazole) Organocatalyst. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201046] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Chauhan P, Kaur J, Chimni SS. Asymmetric Organocatalytic Addition Reactions of Maleimides: A Promising Approach Towards the Synthesis of Chiral Succinimide Derivatives. Chem Asian J 2012; 8:328-46. [DOI: 10.1002/asia.201200684] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Indexed: 01/27/2023]
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Yu H, Liu Q, Li Y, Ni C. Copper-catalyzed synthesis of 2-aminobenzimidazoles from carbonimidoyl dichlorides and amines. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Li L, Chen W, Yang W, Pan Y, Liu H, Tan CH, Jiang Z. Bicyclic guanidine-catalyzed asymmetric Michael additions of 3-benzyl-substituted oxindoles to N-maleimides. Chem Commun (Camb) 2012; 48:5124-6. [DOI: 10.1039/c2cc31587d] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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