2614-88-2Relevant articles and documents
Neutralization-Reionization Study of C6H6O Isomers
Turecek, Frantisek,Drinkwater, Donald E.,Maquestiau, Andre,McLafferty, Fred W.
, p. 669 - 672 (1989)
Neutralization-reionization (+NR+) mass spectrometry is employed to examine the behavior of C6H6) isomers in the gas phase.Phenol and cyclohexa-2,4-dienone are found not to interconvert following neutralization with mercury of their corresponding cation radicals at 9.9 keV kinetic energy.A very low extent of isomerization is observed following collisional activation of fast C6H6O neutrals with helium.The +NR+ and colisionally activated dissociation spectra, the latter obtained at unit mass resolution, are used to identify these +. isomers.Hexa-1,3,5-trienal is found to cyclize spontaneously to cyclohexa-2,4-dienone during attempted pyrolytic preparation.The thermochemistry of these C6H6O molecules and cation radicals is discussed on the basis of experimental data and MNDO calculations.
Photoinitiated Polymerization of Columnar Stacks of Self-Assembled Trialkyl-1,3,5-benzenetricarboxamide Derivatives
Masuda, Mitsutoshi,Jonkheijm, Pascal,Sijbesma, Rint P.,Meijer
, p. 15935 - 15940 (2003)
A disk-shaped molecule, N-(5-sorbyl-pentyl)-N′,N″ -di(n-octyl)benzene-1,3,5-tricarboxamide (1), has been synthesized and assembled into a columnar stack in cyclohexane. Using a photoinitiated process, we polymerized monomer 1 in its self-assembled state a
Chemo-enzymatic Total Synthesis of Oxosorbicillinol, Sorrentanone, Rezishanones B and C, Sorbicatechol A, Bisvertinolone, and (+)-Epoxysorbicillinol
Sib, Anna,Gulder, Tobias A. M.
, p. 14650 - 14653 (2018)
The sorbicillinoids are a large family of fungal natural products, many of which possess highly challenging molecular architectures. Depending on their individual structures they exhibit strong biological activities ranging from radical scavenging and anti-infective properties to cytotoxicity. Despite the resulting strong biomedical potential of these natural products and the interest of synthetic chemists owing to their fascinating structures, many sorbicillinoids are currently not synthetically accessible, thus hampering in-depth biological characterization and structural diversification. By using recombinant oxidoreductase SorbC and readily accessible sorbicillin-type synthetic precursors, we have developed enantioselective, one-pot chemo-enzymatic routes to a broad range of sorbicillinoids, thereby establishing total syntheses of oxosorbicillinol, sorrentanone, rezishanones B and C, sorbicatechol A, bisvertinolone, and (+)-epoxysorbicillinol.
A convenient trans diastereoselective synthesis of 3-butadienylazetidinones and their Diels-Alder cycloaddition reactions
Sharma, Arun K.,Mazumdar, Sujit N.,Mahajan, Mohinder P.
, p. 5506 - 5509 (1996)
An efficient trans diastereoselective synthesis for azetidinones 3 having 3-dienyl functionalities was developed. The method first involved the [2 + 2] cycloaddition of butadienylketene with various imines 1. The 3-dienyl functionality of the resulting azetidinones 3 was then exploited in Diels-Alder cycloaddition reactions with dienophiles, viz. dimethyl acetylenedicarboxylate (DMAD), maleic anhydride (MA), N-phenylmaleimide (NPM), and 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD). The reactions of 3 with DMAD and PTAD resulted in the diastereoselective synthesis of the corresponding Diels-Alder adducts 5a,b and 6. However, the reactions with MA and NPM yielded a mixture (2:1) of diastereoisomers 7/7' and 8/8'.
Effect of Hydroxyl Groups Esterification with Fatty Acids on the Cytotoxicity and Antioxidant Activity of Flavones
Grosicka-Maci?g, Emilia,Kubiak-Tomaszewska, Gra?yna,Roszkowski, Piotr,Struga, Marta,Strzyga-?ach, Paulina
, (2022/01/14)
Flavonoids and polyunsaturated fatty acids due to low cytotoxicity in vitro studies are suggested as potential substances in the prevention of diseases associated with oxidative stress. We examined novel 6-hydroxy-flavanone and 7-hydroxy-flavone conjugates with selected fatty acids (FA) of different length and saturation and examined their cytotoxic and antioxidant potential. Our findings indicate that the conjugation with FA affects the biological activity of both the original flavonoids. The conjugation of 6-hydroxy-flavanone increased its cytotoxicity towards prostate cancer PC3 cells. The most noticeable effect was found for oleate conjugate. A similar trend was observed for 7-hydroxy-flavone conjugates with the most evident effect for oleate and stearate. The cytotoxic potential of all tested conjugates was not specific towards PC3 because the viability of human keratinocytes HaCaT cells decreased after exposure to all conjugates. Additionally, we showed that esterification of the two flavonoids decreased their antioxidant activity compared to that of the original compounds. Of all the tested compounds, only 6-sorbic flavanone showed a slight increase in antioxidant potential compared to that of the original compound. Our data show that conjugated flavonoids are better absorbed and enhance cytotoxic effects, but the presence of FA lowered the antioxidant potential.
Enantioselective and Diastereodivergent Synthesis of Spiroindolenines via Chiral Phosphoric Acid-Catalyzed Cycloaddition
Varlet, Thomas,Mati?i?, Mateja,Van Elslande, Elsa,Neuville, Luc,Gandon, Vincent,Masson, Géraldine
supporting information, p. 11611 - 11619 (2021/08/16)
A diastereodivergent and enantioselective synthesis of chiral spirocyclohexyl-indolenines with four contiguous stereogenic centers is achieved by a chiral phosphoric acid-catalyzed cycloaddition of 2-susbtituted 3-indolylmethanols with 1,3-dienecarbamates. Modular access to two different diastereoisomers with high enantioselectivities was obtained by careful choice of reaction conditions. Their functional group manipulation provides an efficient access to enantioenriched spirocyclohexyl-indolines and -oxindoles. The origins of this stereocontrol have been identified using DFT calculations, which reveal an unexpected mechanism compared to our previous work dealing with enecarbamates.