Novel A-ring cleaved analogs of oleanolic and ursolic acids which affect growth regulation in NRP.152 prostate cells

Syntheses of eight novel A-ring cleaved oleanane and ursane analogs are described. These compounds were assessed for their ability to inhibit cell proliferation in NRP.152 prostate cells. Four A-ring cleaved derivatives showed significant activity; 5β-(1-methyl-2-ethyl)-10α-(3-aminopropyl)-des-A-urs-12-en-28-oic acid was the most active compound, (IC50, 0.3μM).