Totalsynthese des Aldosterons. A. (21→4)‐Lacton der d,l‐δ8a‐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‐δ8a‐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.