Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1314840 | Journal of Fluorine Chemistry | 2008 | 6 Pages |
Reactions of 3β-acetoxy-5α-androstan-17-one with elemental fluorine and Selectfluor® are reported and give contrasting results. Fluorine gives a mixture of mono-fluorinated steroids in which fluorine atoms are attached to tertiary carbon sites whereas Selectfluor® gives fluoro-steroid systems arising from electrophilic aliphatic substitution of the most sterically accessible secondary saturated positions. The identities of the fluoro-steroid products were determined by NMR analysis and X-ray crystallography.
Graphical abstractFluorination of 3β-acetoxy-5α-androstan-17-one by elemental fluorine gives products arising from fluorination at tertiary CH sites whereas Selectfluor gives products derived from fluorination of CH2 sites.Figure optionsDownload full-size imageDownload as PowerPoint slide