Indole- and indolizine-glyoxylamides displaying cytotoxicity against multidrug resistant cancer cell lines

We report herein the SAR studies of a series of indole- and indolizine-glyoxylamides that demonstrate substantial in vitro anti-proliferative activities against cancer cell lines, including multidrug resistance (MDR) phenotypes. The in vitro cytotoxic effects have been demonstrated across a wide array of tumor types of various origins (e.g., breast, colon, uterine).