Relevant bibliographies by topics / Sulfa-Michael

Academic literature on the topic 'Sulfa-Michael'

Author: Grafiati
Published: 11 March 2023
Last updated: 1 April 2023

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Journal articles on the topic "Sulfa-Michael"

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Tözendemir, Deniz, and Cihangir Tanyeli. "The synthesis of chiral β-naphthyl-β-sulfanyl ketones via enantioselective sulfa-Michael reaction in the presence of a bifunctional cinchona/sulfonamide organocatalyst." Beilstein Journal of Organic Chemistry 17 (February 18, 2021): 494–503. http://dx.doi.org/10.3762/bjoc.17.43.

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Cinchona alkaloid-derived organocatalysts are widely employed in various asymmetric transformations, yielding products with high enantiopurity. In this respect, a bifunctional quinine-derived sulfonamide organocatalyst was developed to catalyze the asymmetric sulfa-Michael reaction of naphthalene-1-thiol with trans-chalcone derivatives. The target sulfa-Michael adducts were obtained with up to 96% ee under mild conditions and with a low (1 mol %) catalyst loading. Selected enantiomerically enriched sulfa-Michael addition products were subjected to oxidation to obtain the corresponding sulfones.
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Enders, Dieter, Karsten Lüttgen, and Arun Narine. "Asymmetric Sulfa-Michael Additions." Synthesis 2007, no. 7 (April 2007): 959–80. http://dx.doi.org/10.1055/s-2007-965968.

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Cong, Zi-Song, Yang-Guo Li, Guang-Fen Du, Cheng-Zhi Gu, Bin Dai, and Lin He. "N-Heterocyclic carbene-catalyzed sulfa-Michael addition of enals." Chemical Communications 53, no. 98 (2017): 13129–32. http://dx.doi.org/10.1039/c7cc07269d.

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Chen, Jiean, Sixuan Meng, Leming Wang, Hongmei Tang, and Yong Huang. "Highly enantioselective sulfa-Michael addition reactions using N-heterocyclic carbene as a non-covalent organocatalyst." Chemical Science 6, no. 7 (2015): 4184–89. http://dx.doi.org/10.1039/c5sc00878f.

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Deau, Emmanuel, Alexandra Le Foll, Clémence Fouache, Emilie Corrot, Laetitia Bailly, Vincent Levacher, Pierric Marchand, Florian Querniard, Laurent Bischoff, and Jean-François Brière. "Organocatalytic enantioselective synthesis of β-amino sulfonic acid derivatives." Chemical Communications 57, no. 67 (2021): 8348–51. http://dx.doi.org/10.1039/d1cc03477d.

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Gui, Yong-Yuan, Jian Yang, Liang-Wen Qi, Xiao Wang, Fang Tian, Xiao-Nian Li, Lin Peng, and Li-Xin Wang. "A cinchona alkaloid catalyzed enantioselective sulfa-Michael/aldol cascade reaction of isoindigos: construction of chiral bispirooxindole tetrahydrothiophenes with vicinal quaternary spirocenters." Organic & Biomolecular Chemistry 13, no. 22 (2015): 6371–79. http://dx.doi.org/10.1039/c5ob00774g.

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Qin, Tianyou, Lu Cheng, Sean Xiao-An Zhang, and Weiwei Liao. "Stereoselective synthesis of organosulfur compounds incorporating N-aromatic heterocyclic motifs and quaternary carbon centers via a sulfa-Michael triggered tandem reaction." Chemical Communications 51, no. 47 (2015): 9714–17. http://dx.doi.org/10.1039/c5cc01875g.

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Formica, Michele, Geoffroy Sorin, Alistair J. M. Farley, Jesús Díaz, Robert S. Paton, and Darren J. Dixon. "Bifunctional iminophosphorane catalysed enantioselective sulfa-Michael addition of alkyl thiols to alkenyl benzimidazoles." Chemical Science 9, no. 34 (2018): 6969–74. http://dx.doi.org/10.1039/c8sc01804a.

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Chen, F. E., L. Dai, and S. X. Wang. "Cinchona Alkaloid Squaramide Catalyzed Sulfa-Michael Addition." Synfacts 2010, no. 11 (October 21, 2010): 1301. http://dx.doi.org/10.1055/s-0030-1258780.

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Li, Yuan-Zhen, Ying Wang, Guang-Fen Du, Hai-Yan Zhang, Hong-Li Yang, and Lin He. "N-Heterocyclic-Carbene-Catalyzed Sulfa-Michael additions." Asian Journal of Organic Chemistry 4, no. 4 (January 29, 2015): 327–32. http://dx.doi.org/10.1002/ajoc.201402241.

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Dissertations / Theses on the topic "Sulfa-Michael"

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Nocentini, Benedetta. "Indagine su reazioni di sulfa-Michael di interesse in campo cosmetologico e sul trattamento ricostruttore del capello." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15849/.

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The aim of this work was to evaluate the reactivity of cysteinyl residues that can be found in damaged human hair with Michael acceptors under mild conditions and to gain information on the hair modifications occurring in hair bleached and then repaired with some commercial formulations. In some patents, the use of some molecules effective for repairing damaged hair is claimed. Their structure is compatible with the occurrence of Michael addition reactions, and the need of more detailed studies about the reaction mechanism and the effect on human hair of commercial products containing hair rebuilding agents has inspired this study. First, the investigation was focused to find Michael acceptors alternative to those claimed by the examined patents. As model reaction N-acetyl-L-cysteine was chosen as nucleophilic agent and different electrophiles, such as quinone- and maleic acid- derivatives, as well as a,b-unsatured ketones and esters were used. Subsequently we investigated, through Raman/IR spectroscopy and electronic scanning microscopy (SEM), on the effect of hair treatment with Michael acceptors studied in the first part and also some commercial hair rebuilding formulations.
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Martinelli, Andrea. "Studio di reazioni ed approcci sintetici innovativi per la sintesi di intermedi di interesse industriale." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/10128.

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2012/2013
In questo lavoro di tesi sono state affrontati due temi principali: la risoluzione di diastereoisomeri intermedi nella sintesi della Dorzolamide e lo studio su reazioni di addizione di Michael stereoselettive su substrati chetonici a,b-insaturi con nucleofili allo zolfo. Il primo progetto si è focalizzato sull'impiego di una risoluzione cinetica dinamica per convertire due alcoli diastereomerici in un unico prodotto acilato tramite la combinazione di una reazione di acilazione promossa da enzimi (CALB e subtilisina) ed un catalizzatore di Ru in grado di epimerizzare tra loro gli alcoli. Ulteriori studi hanno permesso di indagare maggiormente su reazioni di solvolisi sui medesimi substrati che hanno permesso di ottenere il prodotto desiderato in ottima resa chimica ed eccesso enantiomerico. Il secondo progretto si è focalizzato sull'impiego di alcuni alcaloidi della Cinchona e su corrispondenti derivati tioureidici in reazioni di Michael stereoselettive. I substrati impiegati sono stati il trans-calcone ed il 2-cicloesen-1-one; nucleofili allo solfo sono stati il benziltiolo ed il tiofenolo. I tisultati ottenuti hanno permesso di verificare l'efficacia dei catalizzatori tioureidici sulle reazioni modello studiate.
XXVI Ciclo
1984
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Moimare, Pierluigi. "Sintesi e caratterizzazione strutturale di derivati piperidinici e morfolinici chirali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19197/.

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The topic of this thesis concerns the study of catalytic processes for the synthesis of chiral 3,4,5-trisubstituted piperidine and 2,6-disubstituted morpholine. Substrates possessing an α,β-unsaturated ester and a ketone moiety, able to undergo addition/cyclization cascade reactions with different pro-nucleophiles (thiophenols, acetone cyanohydrin and malononitrile), have been evaluated. Chiral and achiral systems for phase-transfer catalysis have been applied as catalysts. Moderate enantiomeric excesses have been obtained for the morpholinic products and good to excellent values for the piperidinic products, by using cyclopeptoids and quaternary ammonium salts derived from Chincona alkaloids as catalysts respectively. Moreover, the absolute configuration of the 3,4,5-trisubstituted piperidines has been determined through quantomechanical simulations of their chirooptical spectra. Finally, the relative configuration of the 2,6-disubstituted morpholines has been assigned through NMR experiments.
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Rautschek, Julia. "Ein enantioselektiver Zugang zu Morphinan-Alkaloiden durch temporäre Phenylthio-Derivatisierung." Doctoral thesis, 2018. https://tud.qucosa.de/id/qucosa%3A31146.

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Die Desymmetrisierung eines p-Benzochinon-Monoacetals durch organokatalytische Sulfa-Michael-Addition stellte den C-Ring-Baustein für eine Formalsynthese von (-)-Codein bereit. Mittels diastereoselektiver 1,2-Addition zur A/C-Ringverknüpfung, intramolekularer Nitron-Cycloaddition zur Konstruktion des Phenanthren-Gerüsts und Sulfoxid-Eliminierung konnte das Schlüsselintermediat einer früheren racemischen Codeinsynthese über 12 Stufen ausgehend von Isovanillin in enantiomerenreiner Form verfügbar gemacht werden.
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Book chapters on the topic "Sulfa-Michael"

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Liu, Y., and P. Melchiorre. "Sulfa-Michael Reactions." In Lewis Base and Acid Catalysts, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00182.

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Liu, Y., and P. Melchiorre. "Sulfa-Michael Reactions with Enones." In Lewis Base and Acid Catalysts, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00183.

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Liu, Y., and P. Melchiorre. "Sulfa-Michael Reactions with α-Branched Enals." In Lewis Base and Acid Catalysts, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-204-00184.

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Hof, K., K. M. Lippert, and P. R. Schreiner. "Sulfa-Michael Addition of Alkanethiols to α,β-Unsaturated N-Acylated Oxazolidin-2-ones." In Brønsted Base and Acid Catalysts, and Additional Topics, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-205-00221.

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