1,4-Cycloadducts of various steroidal 5,7-dienes and 4-phenyl-1-2-4-triazoline-3,5-dione gave a separable mixture (3 : 2) of the corresponding Δ5- and Δ7-sterols in good yield when treated with lithium dissolved in refluxing rthylamine.
M. Anastasia, P. Ciufferda and A. Fiecchi, J. Chem. Soc., Chem. Commun., 1982, 1169 DOI: 10.1039/C39820001169
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