Quinazolin-4-one Derivatives as Selective Histone Deacetylase-6 Inhibitors for the Treatment of Alzheimer’s Disease
摘要:
Novel quinazolin-4-one derivatives containing a hydroxamic acid moiety were designed and synthesized. All compounds were subjected to histone deacetylase (HDAC) enzymatic assays to identify selective HDAC6 inhibitors with nanomolar IC50 values. (E)-3-(2-Ethyl-7-fluoro-4-oxo-3-phenethyl-3,4-dihydroquinazolin-6-yl)-N-hydroxyacrylamide, 4h, NHis the most potent HDAC6 inhibitor (IC50, 8 nM). In vitro, these compounds induced neurite outgrowth accompanied by growth-associated protein 43 expression, and they enhanced the synaptic activities of PC12 and SH-SY5Y neuronal cells without producing toxic or mitogenic effects. Several of the compounds dramatically increased nonhistone protein acetylation, specifically of g-tubulin. Some of the more potent HDAC6 inhibitors decreased zinc-mediated beta-amyloid aggregation in vitro. N-Hydroxy-3-(2-methyl-4-oxo-3-phenethyl-3,4-dihydroquinazolin-7-yl)-acrylarnide, 3f, the most promising drug candidate, selectively inhibits HDAC6 (IC50,29 nM), practically does not affect human ether-a-go-go-related membrane channel activity (IC50 >10 mu M) or cytochrome P450 activity (IC50 >63 mu M) in vitro, and significantly improves learning-based performances of mice with beta-amyloid-induced hippocampal lesions.
The activation of the C(sp3)–H of MeOH via HAT for the synthesis of quinazolinones has been achieved using an in situ generated ligand–copper-superoxo complex under visible light.
Iodine promoted dual oxidative C(sp<sup>3</sup>)–H amination of 2-methyl-3-arylquinazolin-4(3<i>H</i>)-ones: a facile route to 1,4-diarylimidazo[1,5-<i>a</i>]quinazolin-5(4<i>H</i>)-ones
作者:Kavitha Donthiboina、Hari Krishna Namballa、Siddiq Pasha Shaik、Jagadeesh Babu Nanubolu、Nagula Shankaraiah、Ahmed Kamal
DOI:10.1039/c7ob02677c
日期:——
of benzylamines and 2-methylquinazolin-4-(3H)-ones was developed to yield imidazo[1,5-a]quinazolin-5(4H)-ones via dual C(sp3)–H amination under metal free conditions in a greener way using molecular oxygen as a terminal oxidant. This tandem transformation provides an efficient approach to construct various functionalized imidazo[1,5-a]quinazolin-5(4H)-ones in a straightforward manner via a sequential
Electrochemical dual oxidative C(sp3)–H amination: switchable synthesis of imidazo-fused quinazolinones
作者:Chengbin Du、Yan Zhang、Tong Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/d4cc00994k
日期:——
An efficient electrochemical dual C(sp3)–H amination was developed under metal-free and chemical oxidant-free conditions. A series of imidazo[1,5-a]quinazolin-5(4H)-ones and 5-oxo-4,5-dihydroimidazo[1,5-a]quinazoline-3-carbonitriles can be obtained in high yields and the product distribution can be modulated by virtue of this method. The reaction mechanism was investigated and the corresponding intermediates
在无金属和无化学氧化剂的条件下开发了一种高效的电化学双C(sp 3 )–H胺化反应。可以高产率得到一系列咪唑并[1,5- a ]喹唑啉-5( 4H )-酮和5-氧代-4,5-二氢咪唑并[1,5- a ]喹唑啉-3-甲腈。可以借助该方法来调节产品分布。考察了反应机理并研究了相应的中间体。该反应具有底物范围广、产物分布可控、条件温和、制备规模化等特点。