Synthesis and Evaluation of Substituted 4-methyl-2-oxo-2H-chromen-7-yl Phenyl Carbamates as Potent Acetylcholinesterase Inhibitors and Anti- Amnestic Agents
Synthesis and Evaluation of Substituted 4-methyl-2-oxo-2H-chromen-7-yl Phenyl Carbamates as Potent Acetylcholinesterase Inhibitors and Anti- Amnestic Agents
By using a cell-based high throughput screening campaign,a novel angelicin derivative 6a was identified to inhibit influenza A (H1N1) virus induced Cytopathic effect in Madin-Darby canine kidney cell culture in low micromolar range. Detailed structure-activity relationship studies of 6a revealed that the angelicin scaffold is essential for activity in pharmacophore B, while meta-substituted phenyl/2-thiophene rings are optimal ill pharmacophore A and C. The optimized lead 4-methyl-9-phenyl-8-(thiophene-2-carbonyl)-furo[2,3-h]chromen-2-one (8g, IC50 = 70 nM) showed 64-fold enhanced activity compared to the high throughput screening (HTS) hit 6a. Also, 8g was found effective in case of influenza A (H3N2) and influenza B virus strains similar to approved anti-influenza drug zanamivir (4). Preliminary mechanistic studies suggest that these compounds act as anti-influenza agents by inhibiting ribonucleoprotein (RNP) complex associated activity and have the potential to be developed further, Which Could form the basis for developing additional defense against influenza pandemics.
Synthesis and Evaluation of Substituted 4-methyl-2-oxo-2H-chromen-7-yl Phenyl Carbamates as Potent Acetylcholinesterase Inhibitors and Anti- Amnestic Agents
作者:Preet Anand、Baldev Singh
DOI:10.2174/1573406411309050009
日期:2013.6.1
The study aimed to synthesize and evaluate substituted 4-methyl-2-oxo-2H-chromen-7-yl phenylcarbamates as
potent acetylcholinesterase (AChE) inhibitors and anti-amnestic agents. The compounds were evaluated for AChE and butyrylcholinesterase
(BuChE) inhibitory activity in rat brain homogenate and plasma, respectively. The most potent test
compound 4d was evaluated for memory testing in scopolamine-induced amnesia. The phenylcarbamate substituted coumarins
(4a-4h) demonstrated more potent AChE inhibitory as compared to parent 7-hydroxy-4-methylcoumarin. The introduction
of phenylcarbamate moiety to coumarin template also significantly increased BuChE inhibitory activity, albeit
less than AChE inhibitory activity with approximate BuChE/AChE selectivity ratio of 20. The compound 4d displayed the
most potent AChE inhibitory activity with IC50 = 13.5 ± 1.7 nM, along with amelioration of amnesia in mice in terms of
restoration of time spent in target quadrant and escap latency time. It is concluded that carbamate derivatives of coumarin
may be employed as potential AChE inhibitors and anti-amnestic agents.