1222-98-6Relevant academic research and scientific papers
CATALYZED SYNTHESIS OF CHALCONES UNDER INTERFACIAL SOLID-LIQUID CONDITIONS WITH ULTRASOUND.
Fuentes, A.,Marinas, J. M.,Sinisterra, J. V.
, p. 4541 - 4544 (1987)
The sonochemical synthesis of chalcones, catalyzed by an activated barium hydroxide catalyst under interfacial solid-liquid conditions, is carried out with very good yields.The sonochemical process takes place at room temperature and with a lower catalyst weight and reaction time than the thermal process.
Preparation of a Bi2WO6 catalyst and its catalytic performance in an alpha alkylation reaction under visible light irradiation
Liu, Xiaoling,Li, Haiying,Ma, Jingjing,Yu, Xiujuan,Wang, Yan,Li, Jingyi
, p. 157 - 166 (2019)
In this study, different types of Bi2WO6 catalysts were synthesized by a hydrothermal method using Bi(NO3)3?5H2O and Na2WO4?2H2O as precursors, and various characterization methods, such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), Brunauer-Emmett-Teller (BET) specific surface area measurements, and photoluminescence (PL) analysis, were used to characterize the morphologies, structures, and valence states of the catalysts. Then, the catalysts were used to catalyze the alpha alkylation reaction of benzyl alcohol and acetophenone to obtain 1,3-diphenyl-1-propenone under visible light irradiation, and the photocatalytic reaction conditions were optimized. To expand the applicable range of alpha alkylation, the influence of different alcohols and different ketone derivatives on the photocatalytic reaction was determined. In addition, the effects of the wavelength and intensity of the light used were also important, and the recyclability of the catalyst and active species (such as superoxide radicals ([rad]O2?), holes (h+) and electrons (e?)) produced during the reaction were tested.
Synthesis, anti-inflammatory, analgesic, COX-1/2 inhibition activities and molecular docking study of pyrazoline derivatives
Abdel-Sayed, Maged A.,Bayomi, Said M.,El-Sherbeny, Magda A.,Abdel-Aziz, Naglaa I.,Eltahir, Kamal Eldin H.,Shehatou, George S.G.,Abdel-Aziz, Alaa A.-M.
, p. 2032 - 2042 (2016)
Design, synthesis and pharmacological activities of a group of 1,3,5-trisubstituted pyrazolines were reported. The chemical structures of the synthesized compounds have been assigned on the basis of IR, MS, 1H NMR, and 13C NMR spectral analyses. The synthesized 1,3,5-trisubstituted pyrazoline derivatives were evaluated in vivo for anti-inflammatory, analgesic activities and in vitro for COX-1/2 inhibition assay. Among the tested compounds, derivatives 4h, 6e, 7a, 7e, and 9 showed more potent anti-inflammatory and analgesic activities than the reference drug celecoxib. On the basis of their higher activities in the in vivo studies compared with celecoxib, the five compounds 4h, 6e, 7a, 7e and 9 were selected to test their inhibitory activities against ovine COX-1/2 using an in vitro cyclooxygenase inhibition assay. Docking study of compounds 7a, 7e and 9 into the COX-2 binding site revealed a similar binding mode to SC-558, a selective COX-2 inhibitor.
Microwave assisted knoevenagel condensation: A facile method for the synthesis of chalcones
Reddy,Maitraie,Narsaiah,Rambabu,Shanthan Rao
, p. 2881 - 2884 (2001)
Microwave irradiation of aromatic aldehydes with acetophenones or malonic acid in presence of anhydrous zinc chloride was resulted exclusively chalcones and cinnamic acids respectively in high yields.
Some thiocarbamoyl based novel anticathepsin agents
Kaur, Ravinder,Raghav, Neera
, (2020)
Cathepsins have emerged as important targets in various tissues degenerative disorders due to their involvement in degradation of extracellular matrices and endogenous protein turnover. Elevated cathepsins levels vis-à-vis decreased concentration of endogenous inhibitors has been reported at different diseased sites. The design and synthesis of specific potential anti-cathepsin agents is therefore of great significance. Most of potential anti-cathepsin agents developed have peptide based structures with an active warhead. Due to oral instability and immunogenic problems related to peptidyl inhibitors drift the synthesis and evaluation of non-peptide cathepsin inhibitors in last two decades. The present work provides a detailed structure activity relationship for developing potential non-peptide anticathepsin agents based on in-vitro inhibition studies of a library of synthesized thiocarbamoyl- non-peptide inhibitors.
Efficient aldol condensation by using modified CaO as solid-base catalysts
Tang, Ying,Chen, Gang,Lu, Yong
, p. 937 - 946 (2012)
A new type of solid-base catalyst for aldol condensation reaction was prepared by modifying commercial CaO with benzyl bromide in a simple way. It was found that modified CaO can effectively catalyze the aldol condensation of acetophenone and benzaldehyde to produce chalcone with a high conversion and good selectivity. The catalyst gave a higher yield (90.5%) of chalcone than commercial CaO. The high catalytic activity and stability of this catalyst was related to the organic modifier with a hydrophilic functional group that improved the diffusion of grease to the catalyst surface and prevented its hydration. The influence of several reaction parameters, such as temperature, catalyst loading and the moisture absorption rate of modified CaO, was investigated. From the results, the basic centers of modified CaO are stable and hardly poisoned by CO2 unlike commercial CaO. The catalyst was completely recyclable without significant loss in activity up to five reaction cycles. Moreover, this catalyst showed a promising future in providing an environmentally clean process for the industrial sector. Springer Science+Business Media B.V. 2011.
Convenient preparation of chiral α,β-epoxy ketones via claisen-schmidt condensation-epoxidation sequence
Wang, Yongcan,Ye, Jinxing,Liang, Xinmiao
, p. 1033 - 1036 (2007)
A novel Clasisen-Schmidt condensation-epoxidation sequence of aldehydes and ketones was developed to produce a series of chiral α,β-epoxy ketones under asymmetric phase-transfer catalytic conditions. The organocatalytic method reported here can afford chiral α,β-epoxy ketones under mild conditions with moderate to good yields and up to 96% ee.
An efficient one-pot synthesis of 2,3-epoxyl-1,3-diaryl-1-propanone directly from acetophenones and aromatic aldehydes under ultrasound irradiation
Li, Ji-Tai,Yin, Ying,Sun, Ming-Xuan
, p. 363 - 366 (2010)
A convenient and efficient one-pot synthesis of 2,3-epoxyl-1,3-diaryl-1-propanone directly from acetophenones and aromatic aldehydes under ultrasound irradiation at room temperature has been described. In comparison to two-step methods, the present procedure has the advantages of mild conditions, shorter reaction time, without isolation of any intermediate, saves energy and no requirement of toxic solvent.
Effect of phosphorus amount on the particle size and catalytic performance of heterogeneous nickel(ii) schiff-base complex in aldol condensation reaction
Eshtiagh-Hosseini, Hossein,Tabari, Taymaz
, p. 1778 - 1791 (2013)
The organic-inorganic hybrid of citric acid, tetraethoxysilane (TEOS), and triethylphosphate (TEP) doped by a nickel Schiff-base complex was prepared by sol-gel method. The prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), scanning tunnelling microscopy (STM), and infrared spectroscopy (IR). In order to determine the phosphorus amount effect on the catalytic activity of the prepared composites, the aldol condensation was used as a model reaction. The results revealed that the composite with 10% phosphorus is a better catalyst in comparison with other composites.
Mechanism of the Conant-Swan Fragmentation and the Formation of Monomeric Metaphosphate Ion
Calvo, Kim C.,Westheimer, F. H.
, p. 4205 - 4210 (1984)
The decomposition of PhCH(PO32-)CHBrCOPh (I) to yield bromide ion, chalcone, and monomeric metaphosphate ion, PO3-, occurs cleanly in methanol at 25 deg C with a rate constant of 69 s-1.Only in the presence of strong base are phosphonic acids fully ionized in methanol, but the reaction is shown to be that of the dianion, and the rate is unaffected by additional nucleophiles.Substitution of a p-methoxyl group into the first phenyl group of I increases the rate about 25-fold and indicates that the formation of the double bond occurs in the rate-limiting step of the overall process; this and additional data rule out the formation of a phostone as intermediate.The reaction thus appears to be a simple fragmentation, where free monomeric metaphosphate is formed.
