Bioorganic and Medicinal Chemistry Letters p. 6610 - 6615 (2010)
Update date:2022-08-05
Topics:
Kumar, G.D. Kishore
Chavarria, Gustavo E.
Charlton-Sevcik, Amanda K.
Yoo, Grace Kim
Song, Jiangli
Strecker, Tracy E.
Siim, Bronwyn G.
Chaplin, David J.
Trawick, Mary Lynn
Pinney, Kevin G.
A series of thiosemicarbazone analogs based on the benzophenone, thiophene, pyridine, and fluorene molecular frameworks has been prepared by chemical synthesis and evaluated as small-molecule inhibitors of the cysteine proteases cathepsin L and cathepsin B. The two most potent inhibitors of cathepsin L in this series (IC50 <135 nM) are brominated-benzophenone thiosemicarbazone analogs that are further functionalized with a phenolic moiety (2 and 6). In addition, a bromo-benzophenone thiosemicarbazone acetyl derivative (3) is also strongly inhibitory against cathepsin L (IC50 = 150.8 nM). Bromine substitution in the thiophene series results in compounds that demonstrate only moderate inhibition of cathepsin L. The two most active analogs in the benzophenone thiosemicarbazone series are highly selective for their inhibition of cathepsin L versus cathepsin B.
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