摘要:
AbstractBased on the results obtained in the racemic series (part I), (—)‐17β‐hydroxy‐des‐A‐androst‐9‐en‐5‐one has been synthesized, starting with (S)‐(—)‐5‐heptanolide. The key step, viz. the condensation of (S)‐(—)‐7‐hydroxy‐1‐nonen‐3‐one (or its amine adduct) with 2‐methyl‐cyclopentane‐1, 3‐dione involves an asymmetric induction. Model experiments with (R)‐(+)‐5‐decanolide leading to the enantiomeric homolog of the BCD‐tricyclic compound are also described.