taraxastane‐type triterpenoid derivatives 4 – 31 were prepared from the naturally occurring triterpenoids faradiol (1) and heliantriol C (3). The cytotoxicactivities of these compounds and arnidiol (2) were evaluated in leukemia (HL60), lung (A549), duodenal (AZ521), and breast (SK‐BR‐3) cancercell lines. 21‐Oxoarnidiol (18) and faradiol 3,16‐di‐O‐l‐alaninate (31) exhibited potent cytotoxicity, with 50% inhibitory