Add time:07/14/2019         Source:sciencedirect.com

(S)-1,2,3,4-Tetrahydroisoquinoline-3-carboxylic acid (TIC) can inhibit thrombosis by inhibiting platelet aggregation. The investigation of amino acids modified TIC reveals that a stretching conformation is critical for high anti-thrombotic activity. The conformational modeling shows that introducing a ring into amino acid modified TIC results in a desirable stretching conformation. According to this hypothesis, we synthesized seventeen novel 2-substituted (S)-2-(3,3-dimethyl-1-oxo-10,10a-dihydroimidazo[1,5-b]isoquinolin-2(1H,3H,5H)-yl)acetic acids (5a–q). In the in vitro anti-platelet aggregation assay, for ADP-induced platelet aggregation the IC50 values of 5a–q are 1.8–3.4-folds lower than that of TIC. In the in vivo anti-thrombotic assay, the effective dose of 5a–q was 167-folds lower than that of TIC. The vessel strip assay showed that 5a–q had mild vasorelaxation activity.

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