Academic literature on the topic 'Asymmetric organocatalysis'

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Journal articles on the topic "Asymmetric organocatalysis"

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Noraishah Abdullah, Zurina Shaameri, Ahmad Sazali Hamzah, and Mohd Fazli Mohammat. "Synthesis of Trans-4-Hydroxyprolineamide and 3-Ketoproline Ethyl Ester for Green Asymmetric Organocatalysts." Journal of Advanced Research in Applied Sciences and Engineering Technology 38, no. 1 (2024): 97–108. http://dx.doi.org/10.37934/araset.38.1.97108.

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Organocatalysts have become one of the three pillars in asymmetric reactions, along with metal catalysis and enzyme catalysis. Organocatalysis is widely acknowledged in both academia and industry as a practical and advantageous synthetic method owing to its operational ease, readily available catalyst, environmentally friendly, and minimal toxicity. Much attention has been focused on the organocatalyst for its superior properties as an efficient and clean catalyst. In this work, a series of green organocatalysts of trans-4-hydroxyprolineamide were efficiently obtained in a two-step reaction ut
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Sánchez-Antonio, Omar, Kevin A. Romero-Sedglach, Erika C. Vázquez-Orta, and Eusebio Juaristi. "New Mesoporous Silica-Supported Organocatalysts Based on (2S)-(1,2,4-Triazol-3-yl)-Proline: Efficient, Reusable, and Heterogeneous Catalysts for the Asymmetric Aldol Reaction." Molecules 25, no. 19 (2020): 4532. http://dx.doi.org/10.3390/molecules25194532.

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Novel organocatalytic systems based on the recently developed (S)-proline derivative (2S)-[5-(benzylthio)-4-phenyl-(1,2,4-triazol)-3-yl]-pyrrolidine supported on mesoporous silica were prepared and their efficiency was assessed in the asymmetric aldol reaction. These materials were fully characterized by FT-IR, MS, XRD, and SEM microscopy, gathering relevant information regarding composition, morphology, and organocatalyst distribution in the doped silica. Careful optimization of the reaction conditions required for their application as catalysts in asymmetric aldol reactions between ketones a
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Quintavalla, Arianna, Davide Carboni, and Marco Lombardo. "Recent Advances in Asymmetric Synthesis of Pyrrolidine-Based Organocatalysts and Their Application: A 15-Year Update." Molecules 28, no. 5 (2023): 2234. http://dx.doi.org/10.3390/molecules28052234.

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In 1971, chemists from Hoffmann-La Roche and Schering AG independently discovered a new asymmetric intramolecular aldol reaction catalyzed by the natural amino acid proline, a transformation now known as the Hajos–Parrish–Eder–Sauer–Wiechert reaction. These remarkable results remained forgotten until List and Barbas reported in 2000 that L-proline was also able to catalyze intermolecular aldol reactions with non-negligible enantioselectivities. In the same year, MacMillan reported on asymmetric Diels–Alder cycloadditions which were efficiently catalyzed by imidazolidinones deriving from natura
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Reyes, Efraim, Liher Prieto, and Andrea Milelli. "Asymmetric Organocatalysis: A Survival Guide to Medicinal Chemists." Molecules 28, no. 1 (2022): 271. http://dx.doi.org/10.3390/molecules28010271.

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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 awar
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Martelli, Lorena S. R., Ingrid V. Machado, Jhonathan R. N. dos Santos, and Arlene G. Corrêa. "Recent Advances in Greener Asymmetric Organocatalysis Using Bio-Based Solvents." Catalysts 13, no. 3 (2023): 553. http://dx.doi.org/10.3390/catal13030553.

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Efficient synthetic methods that avoid the extensive use of hazardous reagents and solvents, as well as harsh reaction conditions, have become paramount in the field of organic synthesis. Organocatalysis is notably one of the best tools in building chemical bonds between carbons and carbon-heteroatoms; however, most examples still employ toxic volatile organic solvents. Although a portfolio of greener solvents is now commercially available, only ethyl alcohol, ethyl acetate, 2-methyltetrahydrofuran, supercritical carbon dioxide, ethyl lactate, and diethyl carbonate have been explored with chir
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Yu, Song-Chen, Liang Cheng, and Li Liu. "Asymmetric Organocatalysis with Chiral Covalent Organic Frameworks." Organic Materials 03, no. 02 (2021): 245–53. http://dx.doi.org/10.1055/a-1400-5581.

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Inspired by Mother Nature, the use of chiral covalent organic frameworks as heterogeneous asymmetric organocatalysts has arisen over the last decade as a new method in enantioselective synthesis. In this Short Review, sophisticated design of these polymeric materials and their application in asymmetric organocatalysis will be discussed.
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Chauhan, Pankaj, and Swapandeep Singh Chimni. "Mechanochemistry assisted asymmetric organocatalysis: A sustainable approach." Beilstein Journal of Organic Chemistry 8 (December 6, 2012): 2132–41. http://dx.doi.org/10.3762/bjoc.8.240.

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Ball-milling and pestle and mortar grinding have emerged as powerful methods for the development of environmentally benign chemical transformations. Recently, the use of these mechanochemical techniques in asymmetric organocatalysis has increased. This review highlights the progress in asymmetric organocatalytic reactions assisted by mechanochemical techniques.
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Fang, Xin, and Chun-Jiang Wang. "Recent advances in asymmetric organocatalysis mediated by bifunctional amine–thioureas bearing multiple hydrogen-bonding donors." Chemical Communications 51, no. 7 (2015): 1185–97. http://dx.doi.org/10.1039/c4cc07909d.

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Recent progress in asymmetric organocatalysis, focusing on fine-tunable amine–thiourea catalysis, is described. Design of novel bifunctional amine–thiourea organocatalysts bearing multiple hydrogen-bonding donors and their applications in asymmetric C–C, C–N, and C–S bond-forming reactions under mild conditions are discussed.
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Song, Jin, Dian-Feng Chen, and Liu-Zhu Gong. "Recent progress in organocatalytic asymmetric total syntheses of complex indole alkaloids." National Science Review 4, no. 3 (2017): 381–96. http://dx.doi.org/10.1093/nsr/nwx028.

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Abstract Indole and its structural analogues have been frequently found in numerous alkaloids, pharmaceutical products and related materials. The enantioselective construction of these structures allows efficient total synthesis of optically pure indole alkaloids, and hence has received worldwide interest. In the past decade, asymmetric organocatalysis has been recognized as one of the most powerful strategies to create chiral molecules with high levels of stereoselectivity. In particular, organocatalytic asymmetric cascade reactions often occur with multiple bond-breaking and forming events s
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Wojaczyńska, Elżbieta, Franz Steppeler, Dominika Iwan, Marie-Christine Scherrmann, and Alberto Marra. "Synthesis and Applications of Carbohydrate-Based Organocatalysts." Molecules 26, no. 23 (2021): 7291. http://dx.doi.org/10.3390/molecules26237291.

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Organocatalysis is a very useful tool for the asymmetric synthesis of biologically or pharmacologically active compounds because it avoids the use of noxious metals, which are difficult to eliminate from the target products. Moreover, in many cases, the organocatalysed reactions can be performed in benign solvents and do not require anhydrous conditions. It is well-known that most of the above-mentioned reactions are promoted by a simple aminoacid, l-proline, or, to a lesser extent, by the more complex cinchona alkaloids. However, during the past three decades, other enantiopure natural compou
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Dissertations / Theses on the topic "Asymmetric organocatalysis"

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Jin, X. "Asymmetric organocatalysis in flow." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.605607.

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This thesis is divided into two sections. In Section I, the desymmetrisation of a <i>meso-</i>cyclic anhydride was described. However, the transformation requires extremely low temperatures (-55°C) and a long reaction time (96 h) in order to achieve high enantioselectivity, which is not feasible for transfer into a continuous flow system. Later on, the work turned to investigation of its application towards the synthesis of chiral cyclopentanes using new enabling technologies. In Section II, the enantioselective Michael addition of aldehydes to nitroethylene in flow was described. The process
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He, Hao. "Organocatalysis : hydrazine and sulfonimide as new functionalities in asymmetric organocatalysis." HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1104.

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Günler, Zeynep Inci. "Primary amine thioureas in asymmetric organocatalysis." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/396191.

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Aquesta tesi es centra en organocatalitzadors de tipus tiourea amina primària (PAT). L’addició de Michael d’acetona a nitroestiré catalitzada per tiourees amina primària va ser estudiada en detall. Els efectes sinergístics de múltiples additius (aigua i àcid acètic) en aquesta reacció varen ser determinats mitjançant anàlisi espectroscòpica de 1H NMR. Els nostres estudis mecanístics van mostrar que l’àcid acètic facilita la hidròlisi dels intermedis d’imina, donant lloc a la catàlisi, i minimitza la formació del subproducte de doble addició. Per la seva banda, l’aigua alenteix la reacció però
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Evans, Gareth J. S. "Theoretical investigation into asymmetric iminium ion organocatalysis." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/55527/.

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The scope of this thesis covered three main areas of this emerging area of chemistry. A reaction pathway is proposed for the formation of iminium ion intermediates from the reaction of secondary amines with carbonyl compounds. This suggests the deprotonation of the amine as the rate-determining step. The effect of modification of amine structure on this pathway was studied, and rationalised using Atoms-in-Molecules analysis. Molecular properties were used to describe a range of secondary amines with an aim to find a relationship between composition and reactivity. A number of catalytic candida
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Mitchell, A. "Asymmetric synthesis of quaternary centres using organocatalysis." Thesis, University of Edinburgh, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.657854.

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The task of creating an all carbon quaternary centre, bearing an alkyl moiety with differentiated functionalities and substituents is a desired key step in organic synthesis. A variety of endeavours by research groups have lead to the construction of stereogenic quaternary centres, albeit with narrow scope of substrate. Despite the repertoire of transition metals/ligand, chiral auxiliaries and reagents available at hand, efficient enantioselective and organocatalytic methodologies for the construction of all carbon quaternary centres still remains a daunting challenge for synthetic chemists. O
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Hacihasanoglu, Antoine. "Biomimetic asymmetric catalysis with bioinspired helical foldamers." Thesis, Bordeaux, 2022. http://www.theses.fr/2022BORD0166.

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L’organocatalyse est une méthodologie qui connait un développement rapide, permettant de réaliser des transformations chimiques complexes dans le contexte général de la chimie durable (procédés sans métaux, recyclage des catalyseurs…). Les applications potentielles incluent l'élaboration rapide d'éléments de base avancés et utiles pour le développement pharmaceutique. Malgré de grandes réalisations, les organocatalyseurs souffrent généralement de certaines limitations comme une faible accélération de la réaction, d'un taux de rotation catalytique faible et de la nécessité de quantités importan
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Li, Qing Hua. "Second generation camphor sulfonyl hydrazine (CaSH II) organocatalysis." HKBU Institutional Repository, 2013. http://repository.hkbu.edu.hk/etd_ra/1525.

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Buskens, Pascal. "Bifunctional organocatalysis in the asymmetric Aza-Baylis-Hillman reaction." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982524137.

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Robinson, Emily R. T. "α,β-unsaturated acyl ammonium intermediates in asymmetric organocatalysis". Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7010.

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This thesis details investigations into the generation and synthetic utility of α,β-unsaturated acyl ammonium intermediates using isothioureas as Lewis base organocatalysts to generate a range of heterocyclic products. Initial investigations focussed on the development of a Michael addition-lactonisation protocol utilising α,β-unsaturated acyl ammonium intermediates (generated in situ from HBTM 2.1 and α,β-unsaturated homoanhydrides) and a range of 1,3-dicarbonyl nucleophiles. Products could be isolated as lactones or as ring-opened highly functionalised esters, giving good yields and excellen
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Hesp, Colin R. "Stereoselective Cope-Type Hydroamination of Allylic Amines Using Simple Aldehydes as Catalysts." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31175.

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Stereoselective hydroaminations of unactivated alkenes are rare as this represents a very challenging synthetic transformation. The most efficient examples occur in biased intramolecular systems and highly enantioselective intermolecular examples are rare, which is consistent with the forcing conditions required to catalyze the reactions. This limited reactivity also accounts for the lack of highly diastereoselective hydroamination variants. Recently our group has shown that intermolecular Cope-Type hydroamination of unactivated alkenes can be achieved using simple aldehydes as catalysts. The
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Books on the topic "Asymmetric organocatalysis"

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List, Benjamin, ed. Asymmetric Organocatalysis. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02815-1.

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Pellissier, Hélène. Recent developments in asymmetric organocatalysis. RSC Pub., 2010.

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Keiji, Maruoka, ed. Science of synthesis: Asymmetric organocatalysis. Georg Thieme, 2012.

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Waser, Mario. Asymmetric Organocatalysis in Natural Product Syntheses. Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1163-5.

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Arndtsen, Bruce A., and Liu-Zhu Gong, eds. Asymmetric Organocatalysis Combined with Metal Catalysis. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43851-7.

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service), SpringerLink (Online, ed. Asymmetric Organocatalysis in Natural Product Syntheses. Springer Vienna, 2012.

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Harald, Gröger, ed. Asymmetric organocatalysis: From biomimetic concepts to applications in asymmetric synthesis. Wiley-VCH, 2005.

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List, Benjamin. Asymmetric Organocatalysis. Springer, 2010.

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List, Benjamin, and K. Maruoka. Asymmetric Organocatalysis. Thieme Medical Publishers, Incorporated, 2012.

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List, Benjamin. Asymmetric Organocatalysis. Springer Berlin / Heidelberg, 2012.

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Book chapters on the topic "Asymmetric organocatalysis"

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Liu, W. J., N. Li, and L. Z. Gong. "Asymmetric Organocatalysis." In Asymmetric Catalysis from a Chinese Perspective. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19472-6_6.

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Zhang, Wen-Zhao, Samik Nanda, and Sanzhong Luo. "Practical Asymmetric Organocatalysis." In Green Techniques for Organic Synthesis and Medicinal Chemistry. John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119288152.ch9.

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Zhang, Long, Lingyun Cui, Sanzhong Luo, and Jin-Pei Cheng. "Supported Asymmetric Organocatalysis." In Green Techniques for Organic Synthesis and Medicinal Chemistry. John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9780470711828.ch5.

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Moyano, Albert. "Activation Modes In Asymmetric Organocatalysis." In Stereoselective Organocatalysis. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118604755.ch02.

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Liu, W. J., N. Li, and L. Z. Gong. "Erratum to: Asymmetric Organocatalysis." In Asymmetric Catalysis from a Chinese Perspective. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19472-6_11.

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Marcia de Figueiredo, Renata, and Jean-Marc Campagne. "Organocatalyzed Asymmetric Arylation and Heteroarylation Reactions." In Comprehensive Enantioselective Organocatalysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527658862.ch35.

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Afewerki, Yi‑Yin, Jing Liu, Liang‑Qiu Liu, and Wen‑Jing Xiao. "Organocatalysis Combined with Photocatalysis." In Asymmetric Organocatalysis Combined with Metal Catalysis. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43851-7_3.

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Bhowmick, Kartick C., and Tanmoy Chanda. "Asymmetric Organocatalysis in Aqueous Media." In Green Techniques for Organic Synthesis and Medicinal Chemistry. John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119288152.ch12.

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Córdova, Armando. "Examples of Metal-Free Direct Catalytic Asymmetric Mannich-Type Reactions Using Aminocatalysis." In Stereoselective Organocatalysis. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118604755.ch04.

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Mori, Keiji, and Takahiko Akiyama. "Brønsted Acids: Chiral Phosphoric Acid Catalysts in Asymmetric Synthesis." In Comprehensive Enantioselective Organocatalysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527658862.ch11.

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Conference papers on the topic "Asymmetric organocatalysis"

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Deobald, Anna Maria, Arlene G. Corrêa, and Márcio W. Paixão. "Application of New Organocatalysts on Asymmetric Epoxidation of Chalcones." In 14th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0188-2.

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Feu, Karla S., Sandrina I. R. M. Silva, Marco A. F. M. Junior, Alexander F. de la Torre, Arlene G. Corrêa, and Márcio W. Paixão. "PEG: An Efficient Green Solvent for Organocatalytic Asymmetric Michael Addition." In 15th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013820194343.

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Behera, Susanta Kumar, and Ramesh Ramapanicker. "Organocatalytic Surfactants for Direct Asymmetric Aldol Reactions in Aqueous Media." In 37th European Peptide Symposium. The European Peptide Society, 2024. http://dx.doi.org/10.17952/37eps.2024.p1049.

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Vicario, Jose Luis, Efraim Reyes Martín, Uxue Uria, Luisa Carrillo Fernández, and Ane Orue. "The Role of Pyranones in Asymmetric Organocatalytic Cascade Reactions." In MOL2NET 2016, International Conference on Multidisciplinary Sciences, 2nd edition. MDPI, 2016. http://dx.doi.org/10.3390/mol2net-02-08014.

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Scatena, Gabriel dos S., Alexander F. De la Torre, Quezia B. Cass, and Márcio W. Paixão. "Silica-Supported Prolyl Pseudo-Peptide Organocatalysts: Application in the Direct Asymmetric Michael Addition." In 15th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013915204013.

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Deobald, Anna Maria, Arlene G. Corrêa, and Márcio W. Paixão. "Synthesis of New Organocatalysts and their Application on Asymmetric Green Epoxidation of , -Unsaturated Aldehydes." In 14th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0188-1.

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Abdullah, Noraishah, Zurina Shaameri, Ahmad Sazali Hamzah та Mohd Fazli Mohammat. "Asymmetric michael addition of cyclohexanones to trans-β-nitrostyrene catalyzes by prolineamide-based organocatalyst". У INTERNATIONAL CONFERENCE ON APPLIED COMPUTATIONAL INTELLIGENCE AND ANALYTICS (ACIA-2022). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0127594.

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