PMID: 19896847

Authors:

Shi Y, Li C, O'Connor SP, Zhang J, Shi M, Bisaha SN, Wang Y, Sitkoff D, Pudzianowski AT, Huang C, Klei HE, Kish K, Yanchunas J Jr, Liu EC, Hartl KS, Seiler SM, Steinbacher TE, Schumacher WA, Atwal KS, Stein PD

Title:

Aroylguanidine-based factor Xa inhibitors: the discovery of BMS-344577.

Journal:

Bioorg Med Chem Lett. 2009 Dec 15;19(24):6882-9. Epub 2009 Oct 23.

Abstract:

We report the design and synthesis of a novel class of N,N'-disubstituted aroylguanidine-based lactam derivatives as potent and orally active FXa inhibitors. The structure-activity relationships (SAR) investigation led to the discovery of the nicotinoyl guanidine 22 as a potent FXa inhibitor (FXa IC(50)=4 nM, EC(2xPT)=7 microM). However, the potent CYP3A4 inhibition activity (IC(50)=0.3 microM) of 22 precluded its further development. Detailed analysis of the X-ray crystal structure of compound 22 bound to FXa indicated that the substituent at the 6-position of the nicotinoyl group of 22 would be solvent-exposed, suggesting that efforts to attenuate the unwanted CYP activity could focus at this position without affecting FXa potency significantly. Further SAR studies on the 6-substituted nicotinoyl guanidines resulted in the discovery of 6-(dimethylcarbamoyl) nicotinoyl guanidine 36 (BMS-344577, IC(50)=9 nM, EC(2xPT)=2.5 microM), which was found to be a selective, orally efficacious FXa inhibitor with an excellent in vitro liability profile, favorable pharmacokinetics and pharmacodynamics in animal models.