Abstract
As the modified cardenolide N-(steroid-17-yl)-maleimide (VII), which is capable of reacting with SH group, has been prepared. Condensation of 17-aminosteroid (IV) with maleic anhydride gave N-(steroid-17-yl)-maleamic acid (V), which on treatment with acetic anhydride was led to VII by intramolecular dehydration (see Chart 2). Formation of isomaleimide (VI), an intermediate leading to VII, is also described.
