Triazole derivatives: a series of Darapladib analogues as orally active Lp-PLA2 inhibitors.

This Letter reports our efforts towards the optimization of our previously identified series of imidazole and triazole derivatives that lead to the discovery of a series of orally active Lp-PLA2 inhibitors in C57 mice. These inhibitors are characterized by the presence of a diamine side chain in the molecules, such as 2c, 2f, and 4a. The introduction of the terminal-end amine succeeded in maintaining the in vitro activities at sub-nanomolar levels. The vivo activities could be greatly affected by variations in the two amines via modulating the metabolic stability and lipophilicity of the compounds.