Abstract
The free fatty acid receptor 1 (FFA1) is considered as a promising anti-diabetic target based on its function of glucose-stimulated insulin secretion. The previously reported compound 2 is a highly potent FFA1 agonist, but it might be suffered from poor pharmacokinetic properties because the phenylpropanoic acid is vulnerable to β-oxidation. To identify orally available analogs, we tried to block the route of β-oxidation by incorporating deuterium at phenylpropionic acid moiety. As expected, the deuterium-based analogs 3 and 4 exhibited better pharmacokinetic properties than parent compound 2. Although the difference of potency between compound 2 and 3 is quite small, the glucose-lowering effect of deuterium analog 3 was better than that of compound 2. Meanwhile, compound 3 docked well into the same binding pocket of TAK-875, and formed almost identical interactions of TAK-875 in binding site. Different from glibenclamide, a lower risk of hypoglycemia was observed in compound 3 even at the high dose of 60 mg/kg.
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