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A Di-π-Methane Rearrangement in the Photolysis of a 4-Oxa-steroidal α,β-Unsaturated Enol-lactone. Photochemical reactions VIII

✍ Scribed by José Alberto Vallet; José Boix; Juan-Julio Bonet; Marie Claire Briansó; Carlos Miravitlles; José Luis Briansó

Publisher: John Wiley and Sons
Year: 1978
Tongue: German
Weight: 364 KB
Volume: 61
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19780610330

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✦ Synopsis

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).

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## Abstract The UV. irradiation of 17 β‐acetoxy‐4‐oxa‐5 α‐androst‐1‐en‐3‐one **(1)** yields A,B‐__diseco__‐steroids originating from a __Norrish I__ process of the lactone function.