Abstract
We describe the discovery and optimization of a novel series of furo[3,2-d]pyrimidines as G protein-coupled receptor 119 agonists. Agonistic activity of 4 (EC50=129nM) was improved by replacing the intramolecular hydrogen bond between the fluorine atom and the aniline hydrogen in the head moiety with a covalent C-C bond to enhance conformational restriction, which consequently gave a lead compound 12 (EC50=53nM). Optimized compound 26, which was identified by the further optimization of 12, exhibited potent activity (EC50=42nM) with improved clearance in liver microsomes and induced a 33% reduction in blood glucose area under the curve at a dose of 10mg/kg in an oral glucose tolerance test in C57BL/6N mice.
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