Design, synthesis and biological evaluation of tricyclic pyrazolo[1,5-<i>c</i>][1,3]benzoxazin-5(5<i>H</i>)-one scaffolds as selective BuChE inhibitors
Based on the structural analysis of tricyclic scaffolds as butyrylcholinesterase (BuChE) inhibitors, a series of pyrazolo[1,5-c][1,3]benzoxazin-5(5H)-one derivatives were designed, synthesized and evaluated for their acetylcholinesterase (AChE) and BuChE inhibitory activity. Compounds with 5-carbonyl and 7- or/and 9-halogen substitutions showed potential BuChE inhibitory activity, among which compounds
Design and synthesis of novel 2-pyrazoline-1-ethanone derivatives as selective MAO inhibitors
作者:Xu Tong、Rui Chen、Tong-Tian Zhang、Yan Han、Wen-Jian Tang、Xin-Hua Liu
DOI:10.1016/j.bmc.2014.12.010
日期:2015.2
Thirty seven novel 2-pyrazoline-1-ethanone derivatives were designed, synthesized and evaluated as selective hMAO inhibitors. Among them, compounds 7h (IC50 = 2.40 mu M) and 12c (IC50 = 2.00 mu M) exhibited best inhibitory activity and selectivity against hMAO-A, surpassing that of the positive control Clorgyline (IC50 = 2.76 mu M). Based on selective activity of hMAO-A, SAR analysis showed that the order of N1 substituent contribution was bromo (3) > piperidinyl (4) > morpholinyl (5) > imidazolyl (6), and compounds with electron-withdrawing substituents (-F, -Cl) at C3 or C5 phenyl ring of 2-pyrazoline nucleus dedicated stronger MAO-A inhibitory activity. Molecular docking showed that compounds 7h and 12c were nicely bound to hMAO-A via two hydrogen bonds (SER209, GLU216), one Pi-Pi interaction and three hydrogen bonds (SER209, GLU216, TYR69), one Sigma-Pi interaction, respectively. In addition, the substituent at C3 position of 2-pyrazoline with the N1 acetyl has little effect on MAO-A inhibitory activity. These data support further studies to assess rational design of more efficiently selective hMAO inhibitors in the future. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis, biological evaluation of novel 4,5-dihydro-2H-pyrazole 2-hydroxyphenyl derivatives as BRAF inhibitors
A series of novel 4,5-dihydropyrazole derivatives (3a-3t) containing hydroxyphenyl moiety as potential V600E mutant BRAF kinase (BRAF(V600E)) inhibitors were designed and synthesized. Docking simulation was performed to insert compounds 3d (1-(5-(5-chloro-2-hydroxyphenyl)-3-(p-tolyl)-4,5-dihydro-1H-pyrazol-1-yl)ethanone) and 3m (1-(3-(4-chlorophenyl)-5-(3,5-dibromo-2-hydroxyphenyl)-4,5-dihydro-1H-pyrazol-1-yl)ethanone) into the crystal structure of BRAF(V600E) to determine the probable binding model, respectively. Based on the preliminary results, compound 3d and 3m with potent inhibitory activity in tumor growth may be a potential anticancer agent. Results of the bioassays against BRAF(V600E), MCF-7 human breast cancer cell line and WM266.4 human melanoma cell line all showed several compounds had potent activities IC50 value in low micromolar range, among them, compound 3d and compound 3m showed strong potent anticancer activity, which were proved by that 3d: IC50 = 1.31 mu M for MCF-7 and IC50 = 0.45 mu M for WM266.5, IC50 = 0.22 mu M for BRAF(V600E), 3m: IC50 = 0.97 mu M for MCF-7 and IC50 = 0.72 mu M for WM266.5, IC50 = 0.46 mu M for BRAF(V600E), which were comparable with the positive control Erlotinib. (C) 2012 Elsevier Ltd. All rights reserved.