Development of Hsp90 C-terminal inhibitors with noviomimetics that manifest anti-proliferative activities

Inhibition of the HSP90 C-terminal domain offers a promising opportunity to treat numerous diseases/indications. Furthermore, the development of HSP90 C-terminal inhibitors (CTIs) is advantageous over N-terminal inhibitors because it avoids the detriments associated with induction of the heat shock response (HSR). However, the lack of co-crystal structures of small molecules bound to the C-terminus have hindered their development. Therefore, structure-activity relationship (SAR) studies have been pursued to optimize such inhibitors. Noviose sugar surrogates, also known as noviomimetics have been prepared to investigate the size and nature of the C-terminal domain binding pocket. Herein, we report the synthesis and anti-proliferative activity manifested by this new series of HSP90 C-terminal inhibitors.