Synthese, Struktur und Reaktionen von Secosteroiden mit einem mittleren Ring V. Photochemische Cyclisation voncis- undtrans-3?-Acetoxy-5-oxo-?1(10)-5, 10-secocholesten
AbstractIn continuation of our work on transannular cyclizations of trans‐3β‐sacetoxy‐5, 10‐seco‐cholest‐1 (10)‐en‐5‐one (1), the ringclosure of this compound and of its cis‐isomer (11) under UV.‐irradiation was examined: both yield the same mixture of oxetanes 2 and 3 exhibiting the natural steroid skeleton.