Author/Authors :
Arie Zask، نويسنده , , Gary Birnberg، نويسنده , , Katherine Cheung، نويسنده , , Joshua Kaplan، نويسنده , , Chuan Niu، نويسنده , , Emily Norton، نويسنده , , Ayako Yamashita، نويسنده , , Carl Beyer، نويسنده , , Girija Krishnamurthy، نويسنده , , Lee M. Greenberger، نويسنده , , Frank Loganzo، نويسنده , , Semiramis Ayral-Kaloustian، نويسنده ,
Abstract :
Modifications of the D-piece carboxylic acid group of the hemiasterlin analog HTI-286 gave tubulin inhibitors which were potent cytotoxic agents in taxol resistant cell lines expressing P-glycoprotein. Amides derived from proline had potency comparable to HTI-286. Reduction of the carboxylic acid to ketones and alcohols or its conversion to acidic heterocycles also gave potent analogs. Synthetic modifications of the carboxylic acid could be carried out selectively using a wide range of synthetic reagents. Proline analog 3 was found to be effective in a human xenograft model in athymic mice.
