Highly Regioselective Route to Substituted Imidazo[1,2-a]quinoxalines
作者:Balendu Singh、Anand Acharya、Hiriyakkanavar Ila
DOI:10.2174/1570178615666180108154309
日期:2018.4.12
A new synthesis of unsymmetrically substituted imidazo[1,2-a]quinoxalines via regioselective displacement of 3-chloro group in 2-(methylthio)-3-chloroquinoxalines by aminoacetaldehyde dimethylacetal and subsequent-acid mediated intramolecular cyclization of the resulting adducts is reported in this study. The utility of the 3-(methylthio) group in these imidazoquinoxalines is also demonstrated by conversion
The inhibition of human glutaminyl cyclase (hQC) has come into focus as a new potential approach for the treatment of Alzheimer's disease. The hallmark of this principle is the prevention of the formation of A beta(3,11(pE)-40,42), as these A beta-species were shown to be of elevated neurotoxicity and likely to act as a seeding core leading to an accelerated formation of A beta-oligomers and fibrils. Starting from 1-(3-(1H-imidazol-1-yl)propyl)-3-(3,4-dimethoxyphenyl)thiourea, bioisosteric replacements led to the development of new classes of inhibitors. The optimization of the metal-binding group was achieved by homology modeling and afforded a first insight into the probable binding mode of the inhibitors in the hQC active site. The efficacy assessment of the hQC inhibitors was performed in cell culture, directly monitoring the inhibition of A beta(3,11(pE)-40,42) formation.