An improved synthesis for dienone 1a and new synthesis for the spirodienones 1b and c are submitted.Whereas 1a is stable in trifluoroacetic acid, 1b and c rearrange to form the dienones 13b and c.Only 13c is further transformed into the stable product phe
Hagenbruch, Bernd,Huenig, Siegfried
p. 3884 - 3894
(2007/10/02)
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