A novel bromination–dehydrobromination reaction of tetrahydro-(–)-α-santonins is reported which has led, via the 2α,14- and 2β, 14-dibromo ketones (2a,b), to two new dienone isomers of (–)-α-santonin whose structures were established by X-ray diffraction and c.d. studies of (2b).
S. Inayama, N. Shimizu, T. Shibata, H. Hori and Y. Iitaka, J. Chem. Soc., Chem. Commun., 1980, 495 DOI: 10.1039/C39800000495
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