A new total synthesis of d,l‐aldosterone‐21‐mono‐O‐acetate is described. It starts from the dodecahydro‐phenanthrene derivative I and the main synthetic pathway is indicated in the formula schemes by bold arrows. The ketalised oxo group in position 3 and the tetrahydro‐pyranyl ether of the 18,11β‐cyclohemiacetal could be preserved throughout the synthesis, and these protecting groups were simultaneously hydrolysed in the last step.