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The oxa-di-π-methane rearrangement of β,γ-unsaturated aldehydes

✍ Scribed by Diego Armesto; Maria J. Ortiz; Santiago Ramano

Publisher: Elsevier Science
Year: 1995
Tongue: French
Weight: 248 KB
Volume: 36
Category: Article
ISSN: 0040-4039
DOI: 10.1016/0040-4039(94)02402-w

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## Abstract The irradiation of 17β‐acetoxy‐4‐oxa‐1,5‐androstadien‐3‐one (**12**) yielded the two stereoisomeric spiro‐lactones **13** and **14**, which result from a di‐π‐methane photorearrangement. A third product, the oxa‐anthrasteroid **15**, was also isolated (__Scheme 3__).