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The synthesis and structure-activity relationships of a novel series of 3-aminothieno[2,3- b ]pyridine-2-carboxamides were explored. Our efforts were focused on modifying the C-4 substituent of the thienopyridine ring to develop orally available bone anabolic agents. 4-Alkoxy derivatives were found to be novel ALPase enhancers without inhibitory effect on P450 activity. Among these derivatives, compound 6k was orally administered to ovariectomized rats, and it was found to significantly improve areal bone mineral density at a dose of 30 mg/kg/day. [ABSTRACT FROM AUTHOR]

Abstract: Current treatment for hepatitis C is barely satisfactory, there is an urgent need to develop novel agents for combating hepatitis C virus infection. This study discovered a new class of thieno[2,3-b]pyridine derivatives as HCV inhibitors. First, a hit compound characterized by a thienopyridine core was identified in a cell-based screening of our privileged small molecule library. And then, structure activity relationship study of the hit compound led to the discovery of several potent compounds without obvious cytotoxicity in vitro (12c, EC50 =3.3μM, SI >30.3, 12b, EC50 =3.5μM, SI >28.6, 10l, EC50 =3.9μM, SI >25.6, 12o, EC50 =4.5μM, SI >22.2, respectively). Although the mechanism of them had not been clearly elucidated, our preliminary optimization of this class of compounds had provided us a start point to develop new anti-HCV agents. [Copyright &y& Elsevier]

Abstract: Several series of thieno[2-3-b]pyridine analogues were synthesized and screened for inhibitory activity against eukaryotic elongation factor-2 kinase (eEF2-K). Modifications around several regions of the lead molecules were made, with a ring fusion adjacent to the nitrogen on the thienopyridine core being critical for activity. The most active compound 34 shows an IC50 of 170nM against eEF2-K in vitro. [Copyright &y& Elsevier]

[Display omitted] The continuing investigation of SAR of 3-aminothieno[2,3- b ]pyridine-2-carboxamide derivatives has been described. In this study, C4-piperidine derivatives with polar functional groups were synthesized to develop orally available bone anabolic agents. The optimized compound 9o (DS96432529), which exhibited the best PK profile and high in vitro activity, showed the highest in vivo efficacy in this series. Moreover, significant synergistic effects were observed following co-administration of DS96432529 and alendronate or parathyroid hormone. The mechanism of action is most likely mediated through CDK8 inhibition. [ABSTRACT FROM AUTHOR]