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김주현,조용서,민선준 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.12
A transition-metal-free and regioselective synthesis of a series of 2-amino-4-alkoxypyrimidines is described. The SNAr alkoxylation of 2,4-dichloropyrimidines regioselectively provided 2-chloro-4-alkoxypyrimidines, which were subsequently subject to the second SNAr amination with cyclic amines in the presence of triethylamine at high temperature to afford 2-amino-4-alkoxypyrimidines in good overall yield.
Classification of Piperazinylalkylisoxazole Library by Recursive Partitioning
김혜정,박우규,조용서,노경태,고훈영,추현아,배애님 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.1
A piperazinylalkylisoxazole library containing 86 compounds was constructed and evaluated for the binding affinities to dopamine (D3) and serotonin (5-HT2A/2C) receptor to develop antipsychotics. Dopamine antagonists (DA) showing selectivity for D3 receptor over the D2 receptor, serotonin antagonists (SA), and serotonin-dopamine dual antagonists (SDA) were identified based on their binding affinity and selectivity. The analogues were divided into three groups of 7 DAs (D3), 33 SAs (5-HT2A/2C), and 46 SDAs (D3 and 5-HT2A/2C). A classification model was generated for identifying structural characteristics of those antagonists with different affinity profiles. On the basis of the results from our previous study, we conducted the generation of the decision trees by the recursive-partitioning (RP) method using Cerius2 2D descriptors, and identified and interpreted the descriptors that discriminate in-house antipsychotic compounds.
Asif Ahmed,조용서,Munikumar Reddy Doddareddy,Shanthi Nagarajan,배애님 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
Serotonin or 5-hydroxytryptamine subtype 2C (5-HT_(2C)) receptor belongs to class A amine subfamily of Gprotein-coupled receptor (GPCR) super family and its ligands has therapeutic promise as anti-depressant and -obesity agents. So far, bovine rhodopsin from class A opsin subfamily was the mostly used X-ray crystal template to model this receptor. Here, we explained homology model using beta 2 adrenergic receptor (β2AR),the model was energetically minimized and validated by flexible ligand docking with known agonists and antagonists. In the active site Asp134, Ser138 of transmembrane 3 (TM3), Arg195 of extracellular loop 2(ECL2) and Tyr358 of TM7 were found as important residues to interact with agonists. In addition to these,V208 of ECL2 and N351 of TM7 was found to interact with antagonists. Several conserved residues including Trp324, Phe327 and Phe328 were also found to contribute hydrophobic interaction. The predicted ligand binding mode is in good agreement with published mutagenesis and homology model data. This new template derived homology model can be useful for further virtual screening based lead identification.
In silico Analysis on hERG Channel Blocking Effect of a Series of T-type Calcium Channel Blockers
장재완,송치만,최기현,조용서,백두종,신계정,Ae Nim Pae 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
Human ether-a-go-go related gene (hERG) potassium channel blockade, an undesirable side effect which might cause sudden cardiac death, is one of the major concerns facing the pharmaceutical industry. The purpose of this study is to develop an in silico QSAR model which uncovers the structural parameters of T-type calcium channel blockers to reduce hERG blockade. Comparative molecular similarity indices analysis (CoMSIA) was conducted on a series of piperazine and benzimidazole derivatives bearing methyl 5-(ethyl(methyl)amino)-2-isopropyl-2-phenylpentanoate moieties, which was synthesized by our group. Three different alignment methods were applied to obtain a reliable model: ligand based alignment, pharmacophore based alignment, and receptor guided alignment. The CoMSIA model with receptor guided alignment yielded the best results : r^2 = 0.955, q^2 = 0.781, r^2_pred = 0.758. The generated CoMSIA contour maps using electrostatic, hydrophobic, H-bond donor, and acceptor fields explain well the structural requirements for hERG nonblockers and also correlate with the lipophilic potential map of the hERG channel pore.
Synthesis and Biological Evaluation of Novel GSK-3β Inhibitors as Anticancer Agents
최민정,고수영,정규성,서선희,조용서,장재완,오다원,배애님 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
A series of isoxazol-indolin-2-one was designed for GSK-3β inhibitors as novel anticancer agents based on their binding mode analysis in GSK-3β crystal structure. Total 21 compounds were synthesized and evaluated for their inhibitory activity against two tumor cell lines (DU145 and HT29). Most of the synthesized compounds were potent with above 80% inhibitory activity at 100 μM, and several compounds were examined for inhibitory activity against GSK-3β. Among them, 15(Z) (R1=H, R2=3-Cl-phenyl) was most active with 78% inhibition of tumor cell line (HT29) at 20 μM and 72% inhibition of GSK-3β at 20 μM.