New tetracyclic tacrine analogs containing pyrano[2,3-c]pyrazole: Efficient synthesis, biological assessment and docking simulation study
摘要:
A new series of tacrine-based acetylcholinesterase (AChE) inhibitors 7a-1 were designed by replacing the benzene ring of tacrine with aryl-dihydropyrano[2,3-c]pyrazole. The poly-functionalized hybrid molecules 7a-1 were efficiently synthesized through multi-component reaction and subsequent Friedlander reaction between the obtained pyrano[2,3-c]pyrazoles and cyclohexanone. Most of target compounds showed potent and selective anti-AChE activity at sub-micromolar range. The most potent compound 7h bearing a 3,4-dimethoxyphenyl group was more active than reference drug tacrine. The representative compound 7h could significantly protect neurons against oxidative stress as potent as quercetin at low concentrations. The docking study of compound 7h with AChE enzyme revealed that the (R)-enantiomer binds preferably to CAS while the (S)-enantiomer prone to be a PAS binder. (C) 2014 Elsevier Masson SAS. All rights reserved.
Glycine-Catalyzed Efficient Synthesis of Pyranopyrazoles via One-Pot Multicomponent Reaction
作者:M. B. Madhusudana Reddy、V. P. Jayashankara、M. A. Pasha
DOI:10.1080/00397910903340686
日期:2010.8.31
A facile and convenient protocol is developed for the fast (5-20min) and high-yielding (85-95%) synthesis of fused pyranopyrazoles from ethyl acetoacetate, hydrazine hydrate, an aldehyde, and malononitrile in the presence of nontoxic, simple, and readily available organocatalyst glycine in aqueous medium at 25 degrees C.
Rapid four-component reactions in water: synthesis of pyranopyrazoles
作者:Gnanasambandam Vasuki、Kandhasamy Kumaravel
DOI:10.1016/j.tetlet.2008.07.055
日期:2008.9
An environmentally benign four-component reaction in aqueous medium at room temperature has been developed for the synthesis of 6-amino-5-cyano-3-methyl-4-aryl/heteroaryl-3H,4H-dihydropyrano[2,3,-c]pyrazoles (C) 2008 Elsevier Ltd. All rights reserved.