Design, synthesis, and biological evaluation of deuterated phenylpropionic acid derivatives as potent and long-acting free fatty acid receptor 1 agonists

Add time:07/15/2019    Source:sciencedirect.com

The free fatty acid receptor 1 (FFA1) is a potential target due to its function in enhancement of glucose-stimulated insulin secretion. Takeda’s compound 1 has robustly in vitro activity for FFA1, but it has been suffered from poor pharmacokinetic (PK) profiles because the phenylpropanoic acid is vulnerable to β-oxidation. To identify orally available agonists, we tried to interdict the metabolically labile group by incorporating two deuterium atoms at the α-position of phenylpropionic acid. Interestingly, the differences of physicochemical properties between hydrogen and deuterium are quite small, but there are many differences in the structure-activity relationship between phenylpropionic acid series and present deuterated series. Further optimizations of deuterated series led to the discovery of compound 18, which exhibited a superior balance in terms of in vitro activity, lipophilicity, and solubility. Better still, compound 18 revealed a lower clearance (CL = 0.44 L/h/kg), higher maximum concentration (Cmax = 7584.27 μg/L), and longer half-life (T1/2 = 4.16 h), resulting in a >23-fold exposure than compound 1. In subsequent in vivo pharmacodynamic studies, compound 18 showed a robustly glucose-lowering effect in rodent without the risk of hypoglycemia.

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