Littérature scientifique sur le sujet « 3-oxazolidine-2 »

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Articles de revues sur le sujet "3-oxazolidine-2"

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Tlekhusezh, Marina, Roman Makuilov et Larisa Badovskaya. « 3-Benzyl-4-(N-benzylcarbamoylmethyl)-2-(3-pyridyl)-1,3-oxazolidine ». Molecules 5, no 12 (23 février 2000) : M141. http://dx.doi.org/10.3390/m141.

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Quick, Matthias P., Roland Fröhlich, Dirk Schepmann et Bernhard Wünsch. « Asymmetric synthesis of 3-substituted tetrahydro-2-benzazepines ». Organic & ; Biomolecular Chemistry 13, no 26 (2015) : 7265–81. http://dx.doi.org/10.1039/c5ob00731c.

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Takibayeva, A. T., M. K. Ibraev et S. K. Kabieva. « Synthesis of new 3-substituted 1,3-oxazolidine-2-thiones ». Russian Journal of General Chemistry 87, no 6 (juin 2017) : 1310–12. http://dx.doi.org/10.1134/s1070363217060299.

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Yadav, Reena, Suryabhan Singh, Manoj Trivedi, Gabriele Kociok-Köhn, Nigam P. Rath, Randolf D. Köhn, Mohd Muddassir et Abhinav Kumar. « New main-group ferrocenyldithiocarbamates and conversion to ferrocene oxazolidine-2-thione and -2-one ». New Journal of Chemistry 44, no 8 (2020) : 3268–77. http://dx.doi.org/10.1039/c9nj06139h.

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Gao, Xing, Dongyu Zhu, Feng Jiang, Jianning Liao, Wei Wang, Yongjun Wu, Lufei Zheng et Hongchao Guo. « Palladium-catalyzed stereoselective (3 + 2) cycloaddition of vinylethylene carbonates with cyclic N-sulfonyl ketimines ». Organic & ; Biomolecular Chemistry 19, no 22 (2021) : 4877–81. http://dx.doi.org/10.1039/d1ob00614b.

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Fu, Ying, Yin-Xia He, Hong-Xia Hou, Wen-Bo Zhu, Hu-Lin Li, Chao Wu et Fang-Yan Xian. « 2,2′-Anhydro-1-(3′,5′-di-O-acetyl-β-D-arabinofuranosyl)uracil, a cyclouridine nucleoside with a C4′-endofuranosyl conformation ». Acta Crystallographica Section C Crystal Structure Communications 69, no 3 (12 février 2013) : 282–84. http://dx.doi.org/10.1107/s0108270113000395.

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2,2′-Anhydro-1-(3′,5′-di-O-acetyl-β-D-arabinofuranosyl)uracil, C13H14N2O7, was obtained by refluxing 2′,3′-O-(methoxymethylene)uridine in acetic anhydride. The structure exhibits a nearly perfect C4′-endo(4E) conformation. The best four-atom plane of the five-membered furanose ring is O—C—C—C, involving the C atoms of the fused five-membered oxazolidine ring, and the torsion angle is only −0.4 (2)°. The oxazolidine ring is essentially coplanar with the six-membered uracil ring [r.m.s. deviation = 0.012 (5) Å and dihedral angle = −3.2 (3)°]. The conformation at the exocyclic C—C bond isgauche–transwhich is stabilized by various C—H...π and C—O...π interactions.
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Zou, Ye-cheng, Zhi-yong Hu et Duan-lin Cao. « 3-(4,6-Dichloro-1,3,5-triazin-2-yl)-2,2-dimethyl-1,3-oxazolidine ». Acta Crystallographica Section E Structure Reports Online 68, no 7 (20 juin 2012) : o2142. http://dx.doi.org/10.1107/s1600536812026578.

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Luk'yanov, B. S., N. B. Ivanov, L. E. Nivorozhkin et V. I. Minkin. « 5,5-Dimethyl-2-thioxo-3-phenylspiro(1,3-oxazolidine-4,2-[2H]chromenes) ». Chemistry of Heterocyclic Compounds 26, no 6 (juin 1990) : 712–13. http://dx.doi.org/10.1007/bf00756437.

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Nogueira, Thais C. M., Alessandra C. Pinheiro, James L. Wardell, Marcus V. N. de Souza, Jordan P. Abberley et William T. A. Harrison. « Weak C—H...O and C—H...π hydrogen bonds and π–π stacking interactions in a series of fourN′-[(E)-(aryl)methylidene]-N-methyl-2-oxo-1,3-oxazolidine-4-carbohydrazides ». Acta Crystallographica Section C Structural Chemistry 71, no 8 (7 juillet 2015) : 647–52. http://dx.doi.org/10.1107/s2053229615012450.

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Oxazolidin-2-ones are widely used as protective groups for 1,2-amino alcohols and chiral derivatives are employed as chiral auxiliaries. The crystal structures of four differently substituted oxazolidinecarbohydrazides, namelyN′-[(E)-benzylidene]-N-methyl-2-oxo-1,3-oxazolidine-4-carbohydrazide, C12H12N3O3, (I),N′-[(E)-2-chlorobenzylidene]-N-methyl-2-oxo-1,3-oxazolidine-4-carbohydrazide, C12H12ClN3O3, (II), (4S)-N′-[(E)-4-chlorobenzylidene]-N-methyl-2-oxo-1,3-oxazolidine-4-carbohydrazide, C12H12ClN3O3, (III), and (4S)-N′-[(E)-2,6-dichlorobenzylidene]-N,3-dimethyl-2-oxo-1,3-oxazolidine-4-carbohydrazide, C13H13Cl2N3O3, (IV), show that an unexpected mild-condition racemization from the chiral starting materials has occurred in (I) and (II). In the extended structures, the centrosymmetric phases, which each crystallize with two molecules (AandB) in the asymmetric unit, formA+Bdimers linked by pairs of N—H...O hydrogen bonds, albeit with different O-atom acceptors. One dimer is composed of one molecule with anSconfiguration for its stereogenic centre and the other with anRconfiguration, and possesses approximate local inversion symmetry. The other dimer consists of eitherR,RorS,Spairs and possesses approximate local twofold symmetry. In the chiral structure, N—H...O hydrogen bonds link the molecules intoC(5) chains, with adjacent molecules related by a 21screw axis. A wide variety of weak interactions, including C—H...O, C—H...Cl, C—H...π and π–π stacking interactions, occur in these structures, but there is little conformity between them.
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Erdsack, Jörg, Markus Schürmann, Hans Preut et Norbert Krause. « tert-Butyl 2,2-dimethyl-4-(3-phenyl-2,5-dihydrofuran-2-yl)oxazolidine-3-carboxylate ». Acta Crystallographica Section E Structure Reports Online 63, no 2 (12 janvier 2007) : o664—o665. http://dx.doi.org/10.1107/s1600536807000839.

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Thèses sur le sujet "3-oxazolidine-2"

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Tardy, Sébastien. « Méthodologie de N-vinylation de spiro-1,3-oxazolidine-2-thiones sur charpentes saccharidiques et évaluation en hétérocycloaddition de Diels-Alder [4+2] à demande inverse ». Phd thesis, Université d'Orléans, 2007. http://tel.archives-ouvertes.fr/tel-00152838.

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Les 1,3-oxazolidinethione-2-thiones (OZT), fonctions thionocarbamates cycliques, ancrées sur des charpentes saccharidiques font l'objet de notre étude. Les travaux menés ont été axés vers l'emploi des OZT chirales en synthèse asymétrique. Dans ce but, nous avons développé une méthodologie de synthèse d'OZT spiraniques sur charpentes saccharidiques ainsi qu'une méthode de N-vinylation des OZT, en poursuivant les connaissances acquises au sein du laboratoire. La chiralité inhérente aux sucres, couplée à la réactivité toute particulière des OZT obtenues, nous a permis d'explorer la réactivité d'auxiliaires chiraux originaux et hautement réactifs : des N-vinyl-1,3-oxazolidine-2-thiones. A la fois sur des molécules chirales simples et sur des charpentes saccharidiques, les OZT N-vinylées ont été testées en transfert de chiralité par hétérocycloaddition de Diels-Alder à demande inverse.
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Huang, Chih-Wei, et 黃智偉. « A study of the effect of 3-butyl-2-1-ethylpentyl-oxazolidine as drying agent for moisture-curable polyurethane ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/jdch9g.

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碩士
國立臺灣科技大學
高分子系
95
A study of the PU system of MDI and PPG, with DMDEE as catalyst and 3-butyl-2-1-ethylpentyl-oxazolidine as drying agent, was presented to observe the reacting rate and physical properties of wet-curing process. The drying agent, 3-butyl-2-1-ethylpentyl-oxazolidine, can reduce the variation of viscosity effectually and didn’t induce the cytotoxicity and suits for the application of medical material as well. With the increasing of molar ratio of MDI, the reaction rate and mechanical properties was increasing and the temperature of glass transition was elevated and the increasing of viscosity was inhibited. With the addition of excessive MDI, the higher reacting heat was shown and the cooling process was necessary to restrain the side reaction. Attributing to the texture structure, the composite fabrics has the excellent vapor-permeability.
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Chapitres de livres sur le sujet "3-oxazolidine-2"

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O'Grady, Ella, Greta Pileckaite, Almha Gilheany, Endrita Kucana, Swarna Jaiswal et Amit K. Jaiswal. « Health-promoting effects of glucosinolates and their breakdown products ». Dans Understanding and optimising the nutraceutical properties of fruit and vegetables, 123–52. Burleigh Dodds Science Publishing, 2022. http://dx.doi.org/10.19103/as.2022.0101.07.

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Glucosinolates (GLs) are a large group of secondary metabolites which are found in cruciferous plants such as broccoli, cabbage, and kale and contain nutritional and physiological active properties. Several factors affect composition levels of glucosinolates such as storage conditions, methods of consuming vegetables as well as agricultural and environmental factors. When cruciferous vegetables are consumed raw, the myrosinase enzyme found in these plants hydrolyzes the GLs in the proximal gastrointestinal tract to produce a variety of metabolites such as isothiocyanates, nitriles, oxazolidine-2-thiones, and indole-3-carbinols. Myrosinase is inactivated when cruciferous vegetables are cooked before consumption, and GLs transport to the colon, where they are hydrolyzed by the intestinal microbiota. There are many potential health effects of GLs such as antimicrobial, antioxidant, anti-inflammatory and anticarcinogenic activity of GLs. This chapter highlights the natural source of glucosinolates, absorption, the impact of various conditions on their bioavailability as well as their various health benefits.
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Taber, Douglass F. « The Nakada Synthesis of (-)-FR182877 ». Dans Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0084.

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The Streptomyces metabolite (-)-FR182877 3 binds to and stabilizes microtubules, showing the same potency of anticancer activity as Taxol (paclitaxel). Masahisa Nakada of Waseda University assembled (Angew. Chem. Int. Ed. 2009, 48, 2580) the hexacyclic ring system of 3 by the tandem intramolecular Diels-Alder–intramolecular hetero Diels-Alder cyclization of 1, generating seven new stereogenic centers in a single step. The construction of the pentaene substrate 1 started with the known aldehyde 4, prepared by homologation of commercial ethyl 3-methyl-4-oxocrotonate. Addition of the propionyl oxazolidine anion 5 proceeded with high diastereocontrol, to give 6. The acyl oxazolidinone was not an efficient acylating agent, so it was converted to the Weinreb amide. Protection and deprotection then delivered the allylic acetate 7. The key step in the pentaene assembly was the carefully optimized Negishi-Wipf methylation of 8, followed by Pd-mediated coupling of the alkenyl organometallic so generated with the allylic acetate, to give 9. Condensation of the derived keto phosphonate 11 with the known aldehyde 12 then delivered the enone 13. The Nakada group has worked extensively on the intramolecular Diels-Alder reaction of substrates such as 1. They have shown that protected anti diols such as 1 cyclize with substantial diastereocontrol and in the desired sense. In contrast, cyclizations of protected syn diols proceed with poor diastereocontrol. The enone 13 was therefore reduced to the anti diol and protected, leading to 14 . Oxidation of 14 at room temperature led to a complex mixture, but slow oxidation at elevated temperature delivered 2 . Although the yield of 2 was not much better than if the reactions were carried out sequentially, first the intramolecular Diels-Alder cyclization, then the intramolecular hetero Diels-Alder cyclization, with the cascade protocol pure 2 was more readily separated from the reaction matrix. With 2 in hand, there was still the challenge of assembling the seven-membered ring. Cyclization was effected with an intramolecular Heck protocol. The two diastereomers of the allylic alcohol 15 cyclized with comparable efficiency. Ir-catalyzed alkene migration then converted the allylic alcohols to a mixture of ketones, which was equilibrated to give the more stable diasteromer.
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