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Relevant bibliographies by topics / Thiourea Catalysts

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Journal articles
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Academic literature on the topic 'Thiourea Catalysts'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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Journal articles on the topic "Thiourea Catalysts"

1

Pitchumani, Venkatachalam, and David W. Lupton. "Studies on Thiourea Catalysed Bromocycloetherification and Bromolactonisations." Australian Journal of Chemistry 73, no. 12 (2020): 1292. http://dx.doi.org/10.1071/ch20184.

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Lewis base catalysed halofunctionalisation reactions of alkenes are well established and allow access to, among others, various oxygen containing heterocycles. By exploiting the known conversion of N-heterocyclic carbenes into the corresponding thioureas it has been possible to prepare and study a range of chiral and non-chiral Lewis base catalysts for such reactions. Although all thiourea catalysts were found to mediate bromocycloetherification and bromolactonisation reactions, they could not be achieved with enantioselectivity.

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Andrés, José M., Miriam Ceballos, Alicia Maestro, Isabel Sanz, and Rafael Pedrosa. "Supported bifunctional thioureas as recoverable and reusable catalysts for enantioselective nitro-Michael reactions." Beilstein Journal of Organic Chemistry 12 (April 1, 2016): 628–35. http://dx.doi.org/10.3762/bjoc.12.61.

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The catalytic activity of different supported bifunctional thioureas on sulfonylpolystyrene resins has been studied in the nitro-Michael addition of different nucleophiles to trans-β-nitrostyrene derivatives. The activity of the catalysts depends on the length of the tether linking the chiral thiourea to the polymer. The best results were obtained with the thiourea derived from (L)-valine and 1,6-hexanediamine. The catalysts can be used in only 2 mol % loading, and reused for at least four cycles in neat conditions. The ball milling promoted additions also worked very well.

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Foli, Giacomo, Cecilia Sasso D'Elia, Mariafrancesca Fochi, and Luca Bernardi. "Reversible modulation of the activity of thiourea catalysts with anions: a simple approach to switchable asymmetric catalysis." RSC Advances 6, no. 71 (2016): 66490–94. http://dx.doi.org/10.1039/c6ra12732k.

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Li, Mao-Lin, Jin-Han Yu, Yi-Hao Li, Shou-Fei Zhu, and Qi-Lin Zhou. "Highly enantioselective carbene insertion into N–H bonds of aliphatic amines." Science 366, no. 6468 (2019): 990–94. http://dx.doi.org/10.1126/science.aaw9939.

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Aliphatic amines strongly coordinate, and therefore easily inhibit, the activity of transition-metal catalysts, posing a marked challenge to nitrogen-hydrogen (N–H) insertion reactions. Here, we report highly enantioselective carbene insertion into N–H bonds of aliphatic amines using two catalysts in tandem: an achiral copper complex and chiral amino-thiourea. Coordination by a homoscorpionate ligand protects the copper center that activates the carbene precursor. The chiral amino-thiourea catalyst then promotes enantioselective proton transfer to generate the stereocenter of the insertion pro

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Vazquez-Chavez, Josué, Socorro Luna-Morales, Diego A. Cruz-Aguilar, et al. "The effect of chiral N-substituents with methyl or trifluoromethyl groups on the catalytic performance of mono- and bifunctional thioureas." Organic & Biomolecular Chemistry 17, no. 47 (2019): 10045–51. http://dx.doi.org/10.1039/c9ob01893j.

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Thiourea organocatalysts with a chiral group containing a trifluoromethyl moiety have better hydrogen bonding properties. However, not all reactions catalysed by bifunctional catalysts are enhanced by stronger NH acidity.

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Takemoto, Yoshiji, and Tsubasa Inokuma. "ChemInform Abstract: Bifunctional Thiourea Catalysts." ChemInform 44, no. 25 (2013): no. http://dx.doi.org/10.1002/chin.201325211.

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Li, Zheng-Yi, Hong-Xiao Tong, Yuan Chen, et al. "Asymmetric Michael addition reactions catalyzed by calix[4]thiourea cyclohexanediamine derivatives." Beilstein Journal of Organic Chemistry 14 (July 25, 2018): 1901–7. http://dx.doi.org/10.3762/bjoc.14.164.

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A number of upper rim-functionalized calix[4]thiourea cyclohexanediamine derivatives have been designed, synthesized and used as catalysts for enantioselective Michael addition reactions between nitroolefins and acetylacetone. The optimal catalyst 2 with a mono-thiourea group exhibited good performance in the presence of water/toluene (v/v = 1:2). Under the optimal reaction conditions, high yields of up to 99% and moderate to good enantioselectivities up to 94% ee were achieved. Detailed experiments clearly showed that the upper rim-functionalized hydrophobic calixarene scaffold played an impo

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Zhang, Zhiguo, Zongbi Bao, and Huabin Xing. "N,N′-Bis[3,5-bis(trifluoromethyl)phenyl]thiourea: a privileged motif for catalyst development." Org. Biomol. Chem. 12, no. 20 (2014): 3151–62. http://dx.doi.org/10.1039/c4ob00306c.

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This review summarizes the key developments of N,N′-bis[3,5-bis(trifluoromethyl)phenyl]thiourea (Schreiner's thiourea)-mediated reactions with the aim to further expand the applications of (thio)urea-based catalysts.

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Bhaskararao, Bangaru, and Raghavan B. Sunoj. "Two chiral catalysts in action: insights into cooperativity and stereoselectivity in proline and cinchona-thiourea dual organocatalysis." Chemical Science 9, no. 46 (2018): 8738–47. http://dx.doi.org/10.1039/c8sc03078b.

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Increasing use of two chiral catalysts in cooperative asymmetric catalysis in recent years raises some fundamental questions on chiral compatibility between the catalysts, modes of activation, and relative disposition of substrates within the chiral environment of the catalysts for effective asymmetric induction.

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Levi, Samuel M., Qiuhan Li, Andreas R. Rötheli, and Eric N. Jacobsen. "Catalytic activation of glycosyl phosphates for stereoselective coupling reactions." Proceedings of the National Academy of Sciences 116, no. 1 (2018): 35–39. http://dx.doi.org/10.1073/pnas.1811186116.

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Glycosyl phosphates are shown to be activated to stereospecific nucleophilic substitution reactions by precisely tailored bis-thiourea catalysts. Enhanced reactivity and scope is observed with phosphate relative to chloride leaving groups. Stronger binding (Km) to the H-bond donor and enhanced reactivity of the complex (kcat) enables efficient catalysis with broad functional group compatibility under mild, neutral conditions.

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Dissertations / Theses on the topic "Thiourea Catalysts"

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Nickerson, David M. "Unique Reactivity Patterns of Enhanced Urea Catalysts." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1395859006.

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Yang, Die Daisy. "Development of polymers for electroplating waste water purification, polymer-supported reagents for organic synthesis and heterogeneous catalysts for aerobic alcohol oxidation reactions." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B39848887.

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Jones, Charlotte E. S. "Enantioselective homogeneous catalysts for the synthesis of fluorinated organic compounds." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2611.

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This thesis is divided into three main results chapters that reflect the path my research took. In the first results chapter, the first organocatalyst for the carbonyl-ene reaction was discovered and found to give high conversion using 1,3-bis(3,5-bis(trifluoromethyl)phenyl)thiourea. Various carbonyl and alkene precursors were examined in the ene reaction in both catalysed and uncatalysed reactions. It was found that ene reactions using fluoral and ethyl trifluoropyruvate give higher rates of reaction when compared to other carbonyl compounds. A novel enantiopure thiourea was synthesised and t

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Yang, Min. "Explorations on transition metal-catalyzed enantioselective cyclization reactions and applications of thiourea ligands." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36784527.

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Yang, Min, and 楊敏. "Explorations on transition metal-catalyzed enantioselective cyclization reactions and applications of thiourea ligands." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36784527.

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Yang, Die Daisy, and 楊蝶. "Development of polymers for electroplating waste water purification, polymer-supported reagents for organic synthesis and heterogeneouscatalysts for aerobic alcohol oxidation reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39848887.

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Broan, Christopher John. "A mechanistic study of the acid and base catalysed reactions of thiourea, 1-substituted thioureas and 1,3 -disubstituted thioureas with 1,2-diketones." Thesis, University of St Andrews, 1989. http://hdl.handle.net/10023/14978.

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Thiourea, 1-substituted thioureas and 1,3-disubstituted thioureas react under acidic or basic catalysis with 1,2-diketones to give a wide variety of products. The nature of the product or products depends on the conditions used, the degree of substitution of the thiourea and on the nature of the aromatic or aliphatic groups attached to the dicarbonyl unit of the diketone. The mechanisms of formation of the various products have been investigated by a variety of techniques, including the determination of rate equations by ultraviolet spectroscopy, the influence of side group substituents on the

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Ford, David Dearborn. "The Role of Catalyst-Catalyst Interactions in Asymmetric Catalysis with (salen)Co(III) Complexes and H-Bond Donors." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11154.

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In asymmetric catalysis, interactions between multiple molecules of catalyst can be important for achieving high catalyst activity and stereoselectivity. In Chapter 1 of this thesis, we introduce catalyst-catalyst interactions in the context of the classic Kagan nonlinear effect (NLE) experiment, and present examples of the strengths and drawbacks of the NLE experiment. For the remainder of the thesis, we explore catalyst-catalyst interactions in the context of two different reactions. First, in Chapter 2, we apply a combination of reaction kinetics and computational chemistry to a reaction th

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Ngo, Thi Thuy Duong. "Chiral thioureas, thiourea-phosphines and amines derived from biomass : synthesis and applications in asymmetric organocatalysis." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS476.

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Cette thèse porte sur la préparation de nouveaux catalyseurs chiraux à partir de composés naturels issus de la biomasse, et leurs applications en organocatalyse asymétrique. La première partie décrit la synthèse de thiourées énantiomériquement pures dérivées de l'isosorbide et l’isommanide. Ces thiourées ont été évaluées comme catalyseurs organiques dans des réactions asymétriques de Friedel-Crafts, d’alkylation, d’addition de type aza-Michael, d’hydroamination et de type Morita-Baylis-Hillman (MBH). Les meilleurs résultats en termes de réactivité et d’induction asymétrique, ont été obtenus da

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10

Nguyen, Thi-Huong. "Synthèse de nouveaux catalyseurs chiraux à base de la L-proline. Applications en catalyse asymétrique." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112382.

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Depuis de nombreuses années, les phosphines chirales multifonctionnelles se sont révélées être des outils synthétiques puissants en organocatalyse asymétrique. Ces catalyseurs qui contiennent un site de base de Lewis et un site d'acide de Bronsted, ont reçu une attention particulière en raison de leur efficacité pour créer des liaisons C-C avec de très bonnes énantiosélectivités. A notre connaissance, la synthèse d'organocatalyseurs de type thiourée-phosphine dérivés de la (L)-proline n'a jamais été décrite dans la littérature. Ce sujet de thèse concerne la synthèse d'une nouvelle famille d'or

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Book chapters on the topic "Thiourea Catalysts"

1

Takemoto, Yoshiji, and Tsubasa Inokuma. "Bifunctional Thiourea Catalysts." In Asymmetric Synthesis II. Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527652235.ch29.

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Inokuma, Tsubasa. "Development of Hydroxy Thiourea Catalysts." In Development of Novel Hydrogen-Bond Donor Catalysts. Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54231-5_3.

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3

Hatakeyama, S. "Using Bifunctional Phosphine–Thiourea Catalysts." In Lewis Base and Acid Catalysts. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00352.

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Hatakeyama, S. "Using a Bifunctional Amine–Thiourea Catalyst." In Lewis Base and Acid Catalysts. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00335.

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Inokuma, T., and Y. Takemoto. "Other Amino Thiourea Catalyzed Reactions." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00344.

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Hof, K., K. M. Lippert, and P. R. Schreiner. "On the Way to Thiourea Organocatalysts." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00206.

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Hof, K., K. M. Lippert, and P. R. Schreiner. "Nonstereoselective Transformations with Achiral Thiourea Derivatives." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00208.

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Hof, K., K. M. Lippert, and P. R. Schreiner. "Stereoselective Transformations with Chiral Thiourea Derivatives." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00209.

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9

Jang, H. B., J. S. Oh, and C. E. Song. "Bifunctional Catalysts Based on 6′-Thiourea Cinchona Alkaloids." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00119.

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Hof, K., K. M. Lippert, and P. R. Schreiner. "Thiourea Derivatives as Organocatalysts in Organic Synthesis." In Brønsted Base and Acid Catalysts, and Additional Topics. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00207.

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