Synthesis and Crystal Structures of Substituted Benzenes and Benzoquinones as Tissue Factor VIIa Inhibitors

Several multistep syntheses of substituted benzenes are reported. The benzene analogues were designed such that their substitution pattern would occupy and interact with the S1, S2, and S3 pockets of the tissue Factor VIIa enzyme. A variety of chemical transformations including nucleophilic additions, reductive aminations, Stille couplings, and polymer-assisted solution-phase (PASP) techniques were used to prepare key intermediates and final products. The initial analogues identified some weakly active compounds which ultimately led to a 340 nM (IC50) tissue Factor VIIa inhibitor with selectivity over other related enzymes. The structure−activity relationship of these inhibitors and the synthetic progression from the discovery of the lead compound to the development of potent analogues will be discussed. The X-ray crystal structures of fluorobenzene 50c and benzoquinone 54 inhibitors complexed with the TF/VIIa enzyme will also be described

Synthesis and Crystal Structures of Substituted Benzenes and Benzoquinones as Tissue Factor VIIa Inhibitors

Several multistep syntheses of substituted benzenes are reported. The benzene analogues were designed such that their substitution pattern would occupy and interact with the S1, S2, and S3 pockets of the tissue Factor VIIa enzyme. A variety of chemical transformations including nucleophilic additions, reductive aminations, Stille couplings, and polymer-assisted solution-phase (PASP) techniques were used to prepare key intermediates and final products. The initial analogues identified some weakly active compounds which ultimately led to a 340 nM (IC50) tissue Factor VIIa inhibitor with selectivity over other related enzymes. The structure−activity relationship of these inhibitors and the synthetic progression from the discovery of the lead compound to the development of potent analogues will be discussed. The X-ray crystal structures of fluorobenzene 50c and benzoquinone 54 inhibitors complexed with the TF/VIIa enzyme will also be described

Design, Synthesis, and Crystal Structure of Selective 2-Pyridone Tissue Factor VIIa Inhibitors

Targeted 2-pyridones were selected as tissue Factor VIIa inhibitors and prepared from 2,6-dibromopyridine via a multistep synthesis. A variety of chemical transformations, including regioselective nucleophilic addition, selective nitrogen alkylation, and a Suzuki coupling, afforded the targeted tissue Factor VIIa inhibitors. The pyridone core was selected as a replacement for the pyrazinone core of noncovalent tissue Factor VIIa inhibitors and designed such that their substitution pattern would occupy and interact with the S1, S2, and S3 pockets of the tissue Factor VIIa enzyme. These compounds were tested in several serine protease enzyme assays involved in the coagulation cascade exhibiting modest activity on tissue Factor VIIa with excellent selectivity over thrombin and Factor Xa. Finally, an X-ray crystal structure of inhibitor 14a bound to tissue Factor VIIa was obtained and will be described

Synthesis and Crystal Structures of Substituted Benzenes and Benzoquinones as Tissue Factor VIIa Inhibitors

Several multistep syntheses of substituted benzenes are reported. The benzene analogues were designed such that their substitution pattern would occupy and interact with the S1, S2, and S3 pockets of the tissue Factor VIIa enzyme. A variety of chemical transformations including nucleophilic additions, reductive aminations, Stille couplings, and polymer-assisted solution-phase (PASP) techniques were used to prepare key intermediates and final products. The initial analogues identified some weakly active compounds which ultimately led to a 340 nM (IC50) tissue Factor VIIa inhibitor with selectivity over other related enzymes. The structure−activity relationship of these inhibitors and the synthetic progression from the discovery of the lead compound to the development of potent analogues will be discussed. The X-ray crystal structures of fluorobenzene 50c and benzoquinone 54 inhibitors complexed with the TF/VIIa enzyme will also be described