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Overexpression of antiapoptotic members of the Bcl-2 family proteins, such as Bcl-x(L) and Mfl-1, has been shown to be involved in resistance to chemotherapeutic drugs in many forms of cancers. Recent efforts from the Abbott Laboratories resulted in the development of the acylsulfonamide compound and clinical candidate that targets selectively Bcl-2, Bcl-x(L), and Bcl-w while it is not active against Mcl-1 and Bfl-1. However, early clinical and preclinical studies suggest that pan-Bcl-2 antagonists, targeting simultaneously Mcl-1, Bcl-xL, and possibly all other four antiapoptotic Bcl-2 proteins, may result in more efficacious drugs. Here, following an NMR fragment-based approach, SAR by ILOEs, we report on compounds that exhibit nanomolar affinities for both Bcl-x(L) and Mcl-1 in vitro. We believe that these molecules can be used as useful starting point for the development of novel Bcl-2 antagonists, in particular targeting Mcl-1.

SAR by Interligand Nuclear Overhauser Effects (ILOEs) Based Discovery of Acylsulfonamide Compounds Active against Bcl-xL and Mcl-1

SAR by Interligand Nuclear Overhauser Effects (ILOEs) Based Discovery of Acylsulfonamide Compounds Active against Bcl-x_L and Mcl-1