Gotowe bibliografie tematyczne / Aza allyl anion

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Gotowa bibliografia na temat „Aza allyl anion”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Aza allyl anion"

Lautens, Mark, Chan Lau i Gavin Tsui. "Synthesis of Unsymmetrical Polysubstituted Pyridines from β-Sulfonylvinylamines via 1-Aza-Allyl Anion Intermediates". Synthesis 2011, nr 23 (27.10.2011): 3908–14. http://dx.doi.org/10.1055/s-0031-1289578.

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Lau, Chan, Gavin Chit Tsui i Mark Lautens. "ChemInform Abstract: Synthesis of Unsymmetrical Polysubstituted Pyridines from β-Sulfonylvinylamines via 1-Aza-Allyl Anion Intermediates." ChemInform 43, nr 15 (15.03.2012): no. http://dx.doi.org/10.1002/chin.201215143.

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Shatzmiller, Shimon, Naim Menashe, Eytan Shalom i Eliezer Bahar. "Synthesis of oxime-based macrocyclic systems by oxidative coupling of an aza-allyl anion derivative – cyclooligomerization of dioxime diethers". Liebigs Annalen der Chemie 1991, nr 12 (12.12.1991): 1259–66. http://dx.doi.org/10.1002/jlac.1991199101217.

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SHATZMILLER, S., N. MENASHE, E. SHALOM i E. BAHAR. "ChemInform Abstract: Synthesis of Oxime-Based Macrocyclic Systems by Oxidative Coupling of an Aza-Allyl Anion Derivative - Cyclooligomerization of Dioxime Diethers." ChemInform 23, nr 10 (22.08.2010): no. http://dx.doi.org/10.1002/chin.199210219.

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Andrews, Philip C., Victoria L. Blair, Emily C. Border, Anna C. Peatt, Jonathan G. MacLellan i Christopher D. Thompson. "Alkali-Metal-Induced C–C Bond Cleavage and CH4Elimination in the Amido → Aza-Allyl Transformation of the (S)-N-α-(Methylbenzyl)benzylamido Anion". Organometallics 32, nr 24 (22.11.2013): 7509–19. http://dx.doi.org/10.1021/om400997b.

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Konakahara, Takeo, Naoki Sugama i Kenji Sato. "A Novel syntjesis of 4-Methyl-, 4-Oxo-, and 4-Amino-3-(3-methyl-5-isoxazolyl)pyridine Derivatives via N-Silyl-1-aza-allyl-Anion". HETEROCYCLES 33, nr 1 (1992): 157. http://dx.doi.org/10.3987/com-91-s64.

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Grigg, Ronald, i Theeravat Mongkolaussavaratana. "XY–ZH systems as potential 1,3-dipoles. Part 9. Aza-allyl anion precursors from the reaction of (1,3-dioxoindan-2-ylidene)malononitrile with α-amino acids and their methyl esters". J. Chem. Soc., Perkin Trans. 1, nr 3 (1988): 541–44. http://dx.doi.org/10.1039/p19880000541.

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Hatanaka, Yasuo, Shuuto Nantaku, Yuhki Nishimura, Tomoyuki Otsuka i Tohru Sekikaw. "Catalytic enantioselective aza-Diels–Alder reactions of unactivated acyclic 1,3-dienes with aryl-, alkenyl-, and alkyl-substituted imines". Chemical Communications 53, nr 64 (2017): 8996–99. http://dx.doi.org/10.1039/c7cc03010j.

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Rezaei Motlagh, Shiva, Razif Harun, Dayang Radiah Awang Biak, Siti Aslina Hussain, Rozita Omar i Amal A. Elgharbawy. "COSMO-RS Based Prediction for Alpha-Linolenic Acid (ALA) Extraction from Microalgae Biomass Using Room Temperature Ionic Liquids (RTILs)". Marine Drugs 18, nr 2 (12.02.2020): 108. http://dx.doi.org/10.3390/md18020108.

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One of the essential fatty acids with therapeutic impacts on human health is known to be omega-3 polyunsaturated fatty acids (PUFA). More lately, ionic liquids (ILs) have received significant attention among scientists in overcoming the disadvantages of traditional solvents in biomass lipid extraction. However, the large pool of cations and anions possibly accessible will lead to a growing number of innovatively synthesized ILs. Nevertheless, the exhaustive measurement of all these systems is economically impractical. The conductive screening model for real solvents (COSMO-RS) is considered a precious approach with the availability of a few models to predict the characteristics of ILs. This work introduces the estimate of capacity values at infinite dilution for a range of ILs using COSMO-RS software as part of solid-liquid extraction. This favorable outcome presented that the capacity values of the IL molecules are extremely dependent on both anions and cations. Among the 352 combinations of cation/anion tested, short alkyl chain cations coupled with inorganic anions were found to be most efficient and therefore superior in the extraction method. Sulphate-, chloride-, and bromide-based ILs were found to have higher extraction capacities in contrast with the remainders, while propanoate revealed an extraordinary capacity when combined with ethyl-based cations. Eventually, the predicted results from COSMO-RS were validated through the experimentally calculated extraction yield of alpha-linolenic acid (ALA) compound from Nannochloropsis sp. microalgae. Three selected ILs namely [EMIM][Cl], [TMAm][Cl], and [EMPyrro][Br] were selected from COSMO-RS for empirical extraction purpose and the validation results pinpointed the good prediction capability of COSMO-RS.

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Barešić, Luka, Davor Margetić i Zoran Glasovac. "Anion-Controlled Synthesis of Novel Guanidine-Substituted Oxanorbornanes". International Journal of Molecular Sciences 23, nr 24 (16.12.2022): 16036. http://dx.doi.org/10.3390/ijms232416036.

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The cycloaddition of simple alkyl-substituted guanidine derivatives is an interesting approach toward polycyclic superbases and guanidine-based organocatalysts. Due to the high nucleophilicity of guanidines, an aza-Michael reaction with dienophiles is more common and presents a huge obstacle in achieving the desired synthetic goal. Our preliminary investigations indicated that the proton could act as a suitable protecting group to regulate the directionality of the reaction. To investigate the role of the protonation state and type of anion, the reactivity of furfuryl guanidines with dimethyl acetylenedicarboxylate was explored. Furfuryl guanidines showed a strong reaction dependence on the nucleophilicity of the counterion and the structure of guanidine. While the reaction of DMAD with the guanidinium halides provided products of an aza-Michael addition, Diels–Alder cycloaddition occurred if non-nucleophilic hexafluorophosphate salts were used. Depending on the structure and the reaction conditions, oxanorbornadiene products underwent subsequent intramolecular cyclization. A tendency toward intramolecular cyclization was interpreted in terms of the pKa of different positions of the guanidine functionality in oxanorbornadienes. New polycyclic guanidines had a slightly decreased pKa in acetonitrile and well-defined geometry suitable for the buildup of selective sensors.

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Rozprawy doktorskie na temat "Aza allyl anion"

Uphade, Manoj B. "Nucleophilic Addition reactions of 2-Aza-allyl anion: Application to the Total Synthesis of Natural Products". Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4614.

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The thesis entitled “Nucleophilic Addition reactions of 2-Aza-allyl anion: Application to the Total Synthesis of Natural Products’’ is divided into two sections with an appendix. First section of the thesis details the addition of lithium carbanion of 1,1-diphenyl-2-azapentadiene 1 to various ,-unsaturated esters. Conjugate addition reaction proceeded smoothly to afford the -amino esters with excellent diastereoselectivity and regioselectivity. The strategy was applied in the total synthesis of the alkaloid epibatidine and to the formal synthesis of stemona alkaloid stemoamide (Scheme-1). Scheme 1: Addition of the lithium anion of 1 to the unsaturated esters xiii Addition of lithium carbanion of 1,1-diphenyl-2-aza-pentadiene 1 to non-racemic sulfinimines was presented in the second section of thesis. Addition to aryl aldehyde derived sulfinimines furnished the vicinal diamines (-addition products) with moderate to very good diastereoselectivity. Addition to ortho-substituted benzaldehyde derived sulfinimines exhibited preference for the formation of -addition products. Sulfinimines prepared from aliphatic aldehydes always furnished the vicinal diamines with excellent diastereoselectivity and good yield. The formed products were exemplified in the total synthesis of alkaloid epiquinamide (Scheme-2). Scheme 2: Addition of lithium carbanion of 1,1-diphenyl-2-aza-pentadiene to non-racemic sulfinimines xiv Another application of the formed vicinal diamines obtained was illustrated in the synthesis of differently protected 1,2-cyclohexyldiamine. Reduction of imine using NaCNBH3 followed by RCM of the diene gave the substituted cyclohexene which was further elaborated to functionalized 1,2-cyclohexyldiamine. Scheme 3: Synthesis of differently protected 1,2-cyclohexyldiamine. In the appendix of the thesis, enantiospecific synthesis of Amaryllidaceae alkaloid (+)-γlycorane is presented. The synthesis is accomplished starting from chiral pool S-ethyl lactate using iterative Claisen and Overman rearrangement reactions as the key steps (Scheme-4) Scheme 4: Total synthesis of -lycorane from S-ethyl lactate

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Lau, Chan Tong. "Rhodium-catalyzed Addition of Arylboronic Acids to Nitriles: Application in the Synthesis of Unsymmetrical Polysubstituted Pyridines". Thesis, 2011. http://hdl.handle.net/1807/31293.

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Investigations pertaining to the rhodium(I)-catalyzed addition of arylboronic acids to (arylsulfonyl)acetonitriles were undertaken. The resulting carbon-carbon bond forming reaction has led to the efficient synthesis of novel stereoselective (Z)-β-sulfonylvinylamines, which upon acidic hydrolysis, afford useful β-keto sulfones possessing a diverse range of aryl and sulfonyl substituents. The synthetic utility of these (Z)-β-sulfonylvinylamines was subsequently explored by generating the corresponding 1-aza-allyl anion equivalents under basic conditions. This interesting anionic intermediate was then introduced to various α,β-unsaturated systems to produce a diverse array of functionalized pyridine derivatives including unsymmetrical polysubstituted pyridines.

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