Totalsynthese des Aldosterons. A. (2 1 →4)‐Lacton der d,l ‐δ 8a ‐1‐Oxo‐ 2α‐methallyl‐4 β‐hydroxy‐4b β‐methyl‐7‐äthylendioxy‐4a α, 10a β‐dodecahydro‐phenanthren‐2 β‐carbonsäure. Über Steroide, 147. Mitteilung

Starting from d,l‐δ 8a ‐1‐oxo‐4 β‐hydroxy‐4b β‐methyl‐7‐ethylene‐ dioxy‐l,2,3,4, 4a α, 4b β, 5,6,7,8,10,10a β‐dodecahydro‐phenanthrene (I) the preparation of several tricyclic intermediates substituted at carbon atom 2 is described. The structure of these compounds has been established by a series of transformations.