A combinatorial series of novel quinazolin-4(3H)-ones were synthesised and their structures were established based on spectroscopic data (IR, NMR, EI-MS, and FAB-MS). The compounds were tested for inhibition of the zinc metalloproteinase thermolysin (TLN) utilizing a chemical array-based approach. Some of the compounds were found to inhibit TLN, with IC50 values ranging from 0.0115 mu M (compound 3) to 122,637 mu M (compound 29). Compound 3 [3-phenyl-2-(trifluoromethyl) quinazolin-4(3H)-one] (IC50 = 0.0115 mu M) and compound 35 [3-(isopropylideneamino)-2,2-dimethyl-2,3-dihydroquinazolin-4 (1H)-one] (IC50 = 0.2477 mu M) were found to be the most potent inhibitors. (C) 2010 Elsevier Ltd. All rights reserved.
Novel 2-aminobenzohydrazide derivatives, design, synthesis, anti-Alzheimer evaluation, SAR studies and molecular docking analysis
In this perspective, a series of diversely substituted sulphonamide based Schiff base derivatives of 2-aminobenzohydazide (06 – 12) have been designed and synthesized efficiently. Additionally, some variously substituted 2, 3-dihydroquinazolin-4(1H)-one derivatives (13 – 15) have also been prepared. Characterization of all synthesized derivatives (03 – 15) was performed by FTIR and NMR spectroscopic
A study of the photochemical behaviour and relaxation mechanisms of <i>anti</i>–<i>syn</i> isomerisation around quinazolinone –N–N bonds
作者:Michal Hricovíni、James R. Asher、Miloš Hricovíni
DOI:10.1039/d2ra04529j
日期:——
High-resolution NMR experiments revealed that differently substituted quinazolinone-based Schiff bases undergo anti to syn isomerisation on exposure to ultraviolet light in DMSO solution. The degree anti to syn conversion varied significantly upon substitution (between 5% and 100%) and also showed two noteworthy features: that relaxation back to the anti-form goes far faster (by at least 3 orders of
高分辨率 NMR 实验表明,不同取代的喹唑啉酮基席夫碱在 DMSO 溶液中暴露于紫外线时会发生反顺异构化。反到顺式转换的程度在取代时显着变化(在 5% 和 100% 之间),并且还显示出两个值得注意的特征:当 C6 环 B 时,放松回到反式的速度要快得多(至少 3 个数量级)和 C 具有邻羟基取代基,并且通过添加酸也可以显着加速弛豫。已经提出了两种可能的机制来解释弛豫过程的差异:(I)偶氮甲碱氢与羰基氧的相互作用导致更慢地恢复为反形式和/或(II)抑制N3孤对的共轭与N[双键,通过质子化和/或内部氢键,长度为 m-dash]CH 双键。对这两种机制都进行了理论上的分析。