✦ LIBER ✦
Photochemische Reaktionen. 78. Mitteilung. Anwendung der π → π*-induzierten Cyclisierung von α,β-ungesättigten γ-Dimethoxymethylketonen auf 19-Methoxy- bzw. 19-Dimethoxy-Steroid-enone und -dienone
✍ Scribed by Milan Karvaš; Franz Marti; Hansuli Wehrli; Kurt Schaffner; Oskar Jeger
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- German
- Weight
- 580 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Irradiation at 254 nm of 19‐dimethoxyandrost‐4‐en‐17 β‐ol‐3‐one acetate (8) afforded the epimeric cyclization products 9 (yield 20%) and 10 (4%). Similar transformations were also achieved with the analogous dimethoxy‐enone 24 (→ 25, 65%), and‐dienone 30 (→ 31, 72%), and with the methoxy‐enone 33 (→ 34, 30%), and‐dienone 35 (→ 36, 17%).