143418-77-3Relevant academic research and scientific papers
Organic semiconductor photocatalyst can bifunctionalize arenes and heteroarenes
Ghosh, Indrajit,Khamrai, Jagadish,Savateev, Aleksandr,Shlapakov, Nikita,Antonietti, Markus,K?nig, Burkhard
, p. 360 - 366 (2019/08/15)
Photoexcited electron-hole pairs on a semiconductor surface can engage in redox reactions with two different substrates. Similar to conventional electrosynthesis, the primary redox intermediates afford only separate oxidized and reduced products or, more rarely, combine to one addition product. Here, we report that a stable organic semiconductor material, mesoporous graphitic carbon nitride (mpg-CN), can act as a visible-light photoredox catalyst to orchestrate oxidative and reductive interfacial electron transfers to two different substrates in a two- or three-component system for direct twofold carbon–hydrogen functionalization of arenes and heteroarenes. The mpg-CN catalyst tolerates reactive radicals and strong nucleophiles, is straightforwardly recoverable by simple centrifugation of reaction mixtures, and is reusable for at least four catalytic transformations with conserved activity.
PYRIMIDINONE DERIVATIVES AND USES THEREOF TO NEUTRALIZE THE BIOLOGICAL ACTIVITY OF CHEMOKINES
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Page/Page column 54; 55, (2018/02/28)
A subject of the present invention is a compound having the general formula (I) a pharmaceutically acceptable salt thereof or a tautomeric form thereof, wherein A, B3, B4, B5, Y, X, B1 and B2 are as defined in any one of claims 1 to 10. Another subject of the invention is the compound as defined above for use as a medicament, in particular for preventing and/or treating inflammation and inflammatory diseases, immune and auto-immune diseases, pain related diseases, genetic diseases and/or cancer.
Design, synthesis, and evaluation of multitarget-directed ligands against Alzheimer's disease based on the fusion of donepezil and curcumin
Yan, Jun,Hu, Jinhui,Liu, Anqiu,He, Lin,Li, Xingshu,Wei, Hui
, p. 2946 - 2955 (2017/05/25)
By fusing donepezil and curcumin, a novel series of compounds were obtained as multitarget-directed ligands against Alzheimer's disease. Among them, compound 11b displayed potent acetylcholinesterase (AChE) inhibition (IC50?=?187?nM) and the highest BuChE/AChE selectivity (66.3). Compound 11b also inhibited 45.3% Aβ1–42 self-aggregation at 20?μM and displayed remarkable antioxidant effects. The metal-chelating property of compound 11b was elucidated by determining the 1:1 stoichiometry for the 11b–Cu(II) complex. The excellent blood–brain barrier permeability of 11b also indicated the potential for the compound to penetrate the central nervous system.
Studies on flavans. III. The total synthesis of (±)-7,4′ -dihydroxy-3′-methoxyflavan, (±)-7,3′-dihydroxy-4′ -methoxyflavan, and (±)-7,4′-dihdroxyflavan
Xue, Jijun,Zhang, Xianshu,Chen, Xuesong,Zhang, Yingpeng,Li, Ying
, p. 3527 - 3536 (2007/10/03)
The first total synthesis of (±)-7,3′-dihydroxy-4′ -methoxyflavan (1) and (±)-7,4′-dihydroxy-3′-methoxyflavan (2), along with the synthesis of (±)-7,4′-dihydroxyflavan (3), three naturally occurring flavans, were described. The key step is the cyclization of 1,3-diaryl-1-propanol by BF3·Et2O.
6-acetyl-8-hydroxy-2,2-dimethylchromene, an antioxidant in sunflower seeds; Its isolation and synthesis and antioxidant activity of its derivatives
Tsuda, Hideyuki,Ishitani, Youichi,Takemura, Yoshiyuki,Suzuki, Yoshiaki,Kato, Tadahiro
, p. 139 - 142 (2007/10/03)
By the guide of assay toward inhibition of photooxidation of β-carotene, 6-acetyl-8-hydroxy-2,2-dimethylchromene (1) was isolated from sunflower seeds. In addition to 1, the analogous compounds possessing the chromene (chromane) skeleton were synthesized and their antioxidant activities were examined.
Studies on the preparation of bioactive lignans by oxidative coupling reaction. VI. Oxidation of methyl (E)-3-(4,5-dihydroxy-2-methoxyphenyl)-2- butenoate and lipid peroxidation-inhibitory effects of the produced caffeoquinone
Maeda,Masuda,Tokoroyama
, p. 1588 - 1591 (2007/10/03)
Oxidation of hydroxy-α-methylcinnamate 5 derived from 4-methylesculetin afforded the α-methylcaffeoquinone derivative 7 without formation of the oxidative coupling product. The reaction of the α-methylferulate derivative 13 afforded a complex mixture of products. Thus, the hydroxy-α- methylcinnamates seem not to be suitable substrates for oxidative coupling. Compound 7 was tested for inhibitory effect on lipid peroxidation. It showed more potent activity than idebenone in rat brain homogenate, and was much more potent than (±)-α-tocopherol in rat liver microsomes.
Flavonoids, 45 . A General and Efficient Synthesis of Hydroxyflavones and -chromones
Patonay, Tamas,Molnar, Denes,Muranyi, Zoltan
, p. 233 - 242 (2007/10/02)
An efficient and versatile method for the synthesis of flavones hydroxylated in either ring A or B and of chromones hydroxylated in is described.This approach is based on the acidic resin-promoted cyclodehydration and simultaneous deprotection of methoxymethoxylated 1-(2-hydroxyphenyl)propane-1,3-diones easily available by either the Baker-Venkataraman rearrangement or the Claisen condensation. - Key words: Amberlyst 15 / Baker-Venkataraman rearrangement / Claisen condensation / hydroxychromone / hydroxyflavone / methoxymethyl protection
