Asymmetric Ion-Pairing Catalysis of the Reversible Cyclization of 2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis of an Equilibrating Reaction
作者:Lukas Hintermann、Claudia Dittmer
DOI:10.1002/ejoc.201200838
日期:2012.10
The asymmetric catalytic cyclization of the simple 2′-hydroxychalcone (1) to flavanone (2), a model for the chalcone isomerase reaction, has been realized as a catalytic asymmetric ion-pairing process with chiral quaternary ammonium salts (e.g., 9-anthracenylmethlycinchoninium chloride; 9-Am-CN-Cl) and NaH as small-molecule co-catalyst. In toluene/CHCl3 solution, the process reaches an intrinsic enantioselectivity
Synthesis and characterization of some substituted chromones as an anti-infective and antioxidant agents
作者:Milind Rode、R. C. Gupta、B. K. Karale、S. S. Rindhe
DOI:10.1002/jhet.5570450607
日期:2008.11
A series of substituted chromones were synthesized and characterized by spectral data. Some of the synthesized compounds were tested for in-vitro antibacterial, antifungal and antioxidant activity. Two compounds have shown very good antioxidant activity and some of the chromone derivatives have exhibited moderate antibacterial and antifungal activity.
A new pyrazoline-based probe of quenched fluorescent reversible recognition for Cu 2+ and its application in cells
作者:Ying-Peng Zhang、Yu-Ying Dong、Yun-Shang Yang、Hui-Chen Guo、Bi-xia Cao、Shi-Qi Sun
DOI:10.1016/j.saa.2017.01.042
日期:2017.4
recognition properties of this compound was investigated by UV–vis absorption and fluorescence spectrophotometry. The results showed that the probe D forms a 1:1 complex with Cu2 + and displayed a linear fluorescence response to Cu2 + with a detection limit of 1.94 × 10− 7 M. In addition, the probe have a good biocompatibility in living cells.
Access to Chromenopyrrole via Tandem [3 + 2] Cycloaddition and Intramolecular C–O Coupling
作者:Bubul Das、Nikita Chakraborty、Hirendra Nath Dhara、Pratip Bhattacharyya、Bhisma K. Patel
DOI:10.1021/acs.joc.3c02479
日期:2024.1.19
A mild and concise method for the synthesis of chromenopyrrole from 2′-hydroxychalcone is devised. The reaction proceeds via an initial [3 + 2] cycloaddition on the C═C bond of 2′-hydroxychalcone and 1,3-dipolarophile, generated in situ by the reaction of ethyl isocyanoacetate and AgOAc. This is then followed by an intramolecular C–O bond formation with the −OH group and C5–H of the in situ generated
A series of twenty 2-aryl-4H-chromen-4-one (flavones) derivatives (3a-3s) were synthesized and tested for hMAO inhibitory activity. Fifteen compounds (3a, 3c, 3e-3h, 3j-3p, 3r, 3s) were found to be selective towards MAO-B, while 3d was selective towards MAO-A, and 3b, 3i and 3q were non-selective. Experimental Selectivity Index for MAO-B ranges from 2.0 (3g, 3p) to 30.0 (3j). Compound 3j, which is carrying 3,4-di-OMeC6H3 groups at R position on the molecule, was found to be potent MAO-B inhibitor amongst the fifteen with K-i value for MAO-B of 0.16 +/- 0.01 mu M comparable to that of standard drug, Selegiline (Ki for MAO-B is 0.16 +/- 0.01 mu M). Compound 3j also appeared as the most selective MAO-B inhibitor according to its best selectivity index (30.0), which is comparable to that of Selegiline (SIMAO-B = 35.0). Molecular docking and molecular dynamics simulation studies were carried out using Autodock-4.0 and Amber12 to understand the molecular level interaction and energy relation of MAO isoforms with selective inhibitors (3d and 3j). Simulation results are in good agreement with the experimental results. Leads identified may further be explored to develop potent isoform specific inhibitors of MAO. (C) 2014 Elsevier Inc. All rights reserved.