Bibliografías temáticas / Panaginsene

Literatura académica sobre el tema "Panaginsene"

Autor: Grafiati
Publicado: 6 de septiembre de 2023

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Artículos de revistas sobre el tema "Panaginsene"

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Singh, Vipin Kumar y Tushar Kanti Chakraborty. "Total Synthesis of Panaginsene". Chemistry – An Asian Journal 16, n.º 7 (8 de marzo de 2021): 753–56. http://dx.doi.org/10.1002/asia.202100144.

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Geum, Sujeong y Hee-Yoon Lee. "Total Synthesis of Panaginsene with Structural Revision". Organic Letters 16, n.º 9 (17 de abril de 2014): 2466–69. http://dx.doi.org/10.1021/ol500849m.

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Stjepanovic, Mihailo, Aleksandar Jankovic, Bojan Vulovic, Radomir Matovic y Radomir Saicic. "Synthetic study on the angular triquinanes". Journal of the Serbian Chemical Society, n.º 00 (2023): 46. http://dx.doi.org/10.2298/jsc230627046s.

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The synthesis of an angular triquinane, which could serve as a suitable platform for the synthesis of several natural products (panaginsene, silphinene, senoxydene) is described. The synthesis is based on two consecutive cyclopentene annulations, where alkenes were used as latent carbonyl functionalities (via Wacker reaction), and cyclopentenone annulation was effected by aldol condensation.
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4

Kim, Yejin, Jung-Woo Lee, Ick-Hyun Jo, Nayeong Kwon, Donghwi Kim, Jong-Wook Chung, Kyong-Hwan Bang y Jeehye Sung. "Volatile Compositions of Panax ginseng and Panax quinquifolium Grown for Different Cultivation Years". Foods 12, n.º 1 (27 de diciembre de 2022): 136. http://dx.doi.org/10.3390/foods12010136.

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The present study examined the volatile profiles of Panax ginseng (Korean ginseng) and Panax quinquefolium (American ginseng) grown for different cultivation years by using HS-SPME/GC-MS and determined the key discriminant volatile compounds by chemometric analysis including principal component analysis (PCA), hierarchical cluster analysis (HCA), and partial least squares-discrimination analysis (PLS-DA). Fifty-six compounds, including forty terpenes, eight alcohols, one alkane, one ketone, and one furan, were identified in the ginseng roots. The chemometric results identified two major clusters of American ginseng and Korean ginseng cultivars with distinct volatile compositions. The volatile compounds in fresh white ginseng roots were affected by the species, but the influence of different cultivation ages was ambiguous. The major volatile components of ginseng roots are terpenes, including monoterpenes and sesquiterpenes. In particular, panaginsene, ginsinsene, α-isocomene, and caryophyllene were predominant in Korean ginseng cultivars, whereas β-farnesene levels were higher in American ginseng. The difference in volatile patterns between Panax ginseng and Panax quinquefolium could be attributed to the composition of sesquiterpenes such as β-panaginsene, ginsinsene, caryophyllene, and β-farnesene.
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5

Geum, Sujeong y Hee-Yoon Lee. "ChemInform Abstract: Total Synthesis of Panaginsene with Structural Revision." ChemInform 45, n.º 47 (6 de noviembre de 2014): no. http://dx.doi.org/10.1002/chin.201447217.

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"Total Synthesis of Panaginsene". Synfacts 10, n.º 07 (16 de junio de 2014): 0675. http://dx.doi.org/10.1055/s-0033-1339159.

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Shi, Pei-Qiong, Jing Liu, Jun-Xi Ye, Ting-Zhen Zhang, Yu-Chun Lin, Qiao-Bin Lao, Bao-Li Qiu, Hong-Kai Zhou y Jin Xu. "Population changes of Bemisia tabaci (Hemiptera: Aleyrodidae) on different colored poinsettia leaves with different trichome densities and chemical compositions". Journal of Economic Entomology, 4 de junio de 2023. http://dx.doi.org/10.1093/jee/toad100.

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Abstract The whitefly, Bemisia tabaci, is a destructive and invasive pest of many horticultural plants including poinsettia (Euphorbia pulcherrima). Outbreaks of B. tabaci cause serious damage by direct feeding on phloem sap, and spreading 100+ plant viruses to crops. Bemisia tabaci were observed more frequently on green than red poinsettia leaves, and the factors responsible for this are unknown. Here, we investigated the development rate, survivorship, fecundity of B. tabaci feeding on green versus red leaves, as well as the leaves’ volatiles, trichome density, anthocyanin content, soluble sugars, and free amino acids. Compared to red leaves, B. tabaci on green leaves showed increased fecundity, a higher female sex ratio, and survival rate. The green color alone was more attractive to B. tabaci than red. Red leaves of poinsettia contained more phenol, and panaginsene in their volatiles. Alpha-copaene and caryophyllene were more abundant in the volatiles of poinsettia green leaves. Leaf trichome density, soluble sugars and free amino acids were higher in green than red leaves of poinsettia, anthocyanin was lower in green than red leaves. Overall, green leaves of poinsettia were more susceptible and attractive to B. tabaci. The morphological and chemical variation between red and green leaves also differed; further investigation may reveal how these traits affect B. tabaci’s responses.
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Tesis sobre el tema "Panaginsene"

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Singh, Vipin Kumar. "Radical and Lewis Acid Mediated Syntheses of Panaginsene, Indole-Fused Azabicyclo[3.3.1]Nonane and Davanoids". Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5825.

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The thesis contains radical and Lewis acid-mediated syntheses of panaginsene, indole-fused azabicyclo[3.3.1]nonanes, and davanoids. The thesis includes three chapters; chapter-I contains the total synthesis of panaginsene, which is an angularly fused tricyclic molecule having a quaternary carbon center. A Ti(III)-mediated radical cyclization protocol was used to construct the C-C bond, which yielded the quaternary carbon center. The tetra substituted olefin was synthesized by McMurry olefination reaction. Chapter II focused on constructing an indole-fused azabicyclo[3.3.1]nonane core of many alstonia alkaloids, which was synthesized using Sm(II)-mediated radical cyclization reaction. The precursor tetrahydro β-carboline was synthesized by the Pictet-Spengler reaction. A novel radical cyclization protocol was developed to achieve the azabicyclo[3.3.1]nonane core annulated with an indole ring. Chapter III contains a Lewis acid-mediated cycloetherification reaction to construct the tetrahydrofuran core of davanoid natural products. The side chain of davanoids was introduced by Grignard addition on Weinreb amides of davana acid. The non-Evans syn aldol reaction was used to achieve the enantioselective synthesis of the chiral centers of davanoids. Some of the key reactions utilized in this thesis are Ti(III)-mediated radical cyclization, Michael reaction, Sharpless asymmetric epoxidation reaction, HWE reaction, McMurry olefination reaction, Pictet-Spengler reaction, Sm(II)-mediated radical cyclization, Wittig olefination reaction, non Evans syn aldol reaction, Lewis acid-mediated cycloetherification reaction, and Grignard reaction.
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Capítulos de libros sobre el tema "Panaginsene"

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Taber, Douglass F. "Other Methods for C–C Ring Construction: Pinolinone (Bach), Agelastatin A (Batey), Panaginsene (Lee), Salvileucalin D, Salvileucalin C (Ding), ent-Codeine (Hudlicky), Walsucochin B (Xie/Shi)". En Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0081.

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Thorsten Bach of the Technische Universität München used (Chem. Commun. 2014, 50, 3353) the chiral medium-mediated photochemical 2+2 cycloaddition that he devel­oped to prepare 3 by combining 1 with 2. Oxidative cleavage led to (−)-pinolinone 4. Robert A. Batey of the University of Toronto rearranged (Angew. Chem. Int. Ed. 2013, 52, 10862) furfural 5 in the presence of 6 to give the enone 7. Acylation fol­lowed by intramolecular conjugate addition delivered agelastatin A 8. Hee-Yoon Lee of KAIST prepared (Org. Lett. 2014, 16, 2466) the tosylhydrazone Na salt 9 from citronellal. Thermolysis led, via a dialkyl diazo intermediate, to the tricy­clic 10. Direct comparison of synthetic material with the natural product panaginsene 11 enabled the assignment of the relative configuration of the pendant methyl group. Hanfeng Ding of Zhejiang University eliminated (Org. Lett. 2014, 16, 3376) HBr from 12 to give, after rearrangement, the cycloheptadiene salvileucalin D 13. Irradiation converted 13 to the cyclobutene salvileucalin C 14. In a recent chapter of his continuing work on the morphine alkaloids, Tomas Hudlicky of Brock University described (Adv. Synth. Catal. 2014, 356, 333) the intra­molecular [3+2] cycloaddition of the nitrone derived from 15 to give 16. This was readily carried on to ent-codeine 17. Xingang Xie and Xuegong She of Lanzhou University used (Org. Lett. 2014, 16, 1996) Shi epoxidation and Itsuno–Corey reduction to prepare 18 in enantiomerically-pure form. Cationic cyclization converted 18 to 19, that was oxidized to (−)-walsucochin B 20.
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