Add time:07/19/2019         Source:sciencedirect.com

In this investigation, we searched for novel MAO-A inhibitors using a 3-benzylquinoxaline scaffold based on our earlier findings. Series of N′-(3-benzylquinoxalin-2-yl)acetohydrazide, 4a, N′-(3-benzylquinoxalin-2-yl)benzohydrazide derivatives 4b–f, N′-[2-(3-benzyl-2-oxoquinoxalin-1(2H)-yl)acetyl]benzohydrazide derivatives 7a–d, (9H-fluoren-9-yl)methyl 1-[2-(2-(3-benzyl-2-oxoquinoxalin-1(2H)-yl)acetyl)-hydrazinyl]-2-ylcarbamate derivatives 8a–c, 2-(3-benzyl-2-oxoquinoxalin-1(2H)-yl)-N′-benzylidene acetohydrazide derivatives 9a–h, and ethyl 2-(3-benzyl-2-oxoquinoxalin-1(2H)-yl)acetate derivatives 10a–e were synthesized and evaluated in vitro as inhibitors of the two monoamine oxidase isoforms, MAO-A and MAO-B. Most of the compounds showed a selective MAO-A inhibitory activity in the nanomolar or low micromolar range. Compounds 4e and 9g were the most potent derivatives with high MAO-A selectivity and their molecular docking studies were performed in order to rationalize the obtained biological result.

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