853070-09-4

Downstream Products

• 853069-56-4 tert-butyl {(3R)-1-[3-(2-chlorobenzyl)-8-(dimethylcarbamoyl)-5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinolin-2-yl]piperidin-3-yl}carbamate 
• 853069-54-2 tert-butyl {(3R)-1-[8-carbamoyl-3-(2-chlorobenzyl)-5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinolin-2-yl]piperidin-3-yl}carbamate 
• 853069-74-6 2-{(3R)-3-[(tert-butoxycarbonyl)amino]piperidin-1-yl}-3-(2-chlorobenzyl)-5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinoline-8-carboxylic acid 
• 853069-35-9 methyl 2-{(3R)-3-[(tert-butoxycarbonyl)amino]piperidin-1-yl}-3-(2-chloro-5-fluorobenzyl)-5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinoline-8-carboxylate 
• 853069-75-7 2-{(3R)-3-[(tert-butoxycarbonyl)amino]piperidin-1-yl}-3-(2-chloro-5-fluorobenzyl)-5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinoline-8-carboxylic acid 

Relevant academic research and scientific papers

Discovery of 3H-imidazo[4,5-c]quinolin-4(5H)-ones as potent and selective dipeptidyl peptidase IV (DPP-4) inhibitors

In recent years, dipeptidyl peptidase IV inhibitors have been noted as valuable agents for treatment of type 2 diabetes. Herein, we report the discovery of a novel potent DPP-4 inhibitor with 3H-imidazo[4,5-c]quinolin-4(5H) -one as skeleton. After efficient optimization of the lead compound 2a at the 7- and 8-positions using a docking study, we found 28 as a novel DPP-4 inhibitor with excellent selectivity against various DPP-4 homologues. Compound 28 showed strong DPP-4 inhibitory activity compared to marketed DPP-4 inhibitors. We also found that a carboxyl group at the 7-position could interact with the residue of Lys554 to form a salt bridge. Additionally, introduction of a carboxyl group to 7-position led to both activity enhancement and reduced risk for hERG channel inhibition and induced phospholipidosis. In our synthesis of compounds with 7-carboxyl group, we achieved efficient regioselective synthesis using bulky ester in the intramolecular palladium coupling reaction.