Novel compounds useful for inhibiting the 90 kDa heat shock proteins containing a quinone-like moiety and a di-hydroxy phenol like moiety, similar to geldanamycin and radicicol.
Synthesis and Evaluation of Radamide Analogues, A Chimera of Radicicol and Geldanamycin
作者:M. Kyle Hadden、Brian S. J. Blagg
DOI:10.1021/jo900278g
日期:2009.7.3
Previously, we reported the Hsp90 inhibitory activity of radamide, an open chain amide chimera of geldanamycin and radicicol. Attempts to further expand upon structure-activity relationships for this class of Hsp90 inhibitors led to the preparation of a series of radamide analogues focused on differing tether lengths and quinone mimics. In addition, the cup-shaped conformation adopted by the two natural products when bound to the Hsp90 N-terminal ATP binding pocket suggests that conformationally biased compounds may demonstrate improved binding and inhibition. The preparation and evaluation of radamide analogues with cisltrans alpha,beta-unsaturated amides yielded compounds that exhibit improved antiproliferative activity. In addition, several analogues demonstrated the ability to induce degradation of Hsp90-dependent oncogenic signaling proteins in vitro, a hallmark of Hsp90 N-terminal inhibition.
Design, Synthesis, and Evaluation of a Radicicol and Geldanamycin Chimera, Radamide
作者:Randell C. Clevenger、Brian S. J. Blagg
DOI:10.1021/ol048266o
日期:2004.11.1
A chimera composed of the natural products radicicol and geldanamycin has been prepared through an amide linkage connecting the resorcinol moiety of radicicol to the quinone ring of geldanamycin. The inhibitory activity of these compounds was determined by their ability to inhibit Hsp90's inherent ATPase activity along with degradation of the Hsp90 client protein, HER-2 in MCF-7 breast cancer cells.