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Treatment of 6α,9α-difluoro-11β,21-dihydroxy-3,20-dioxo-16α,17α-isopropylidenedioxyp regna-1,4-diene-21-yl acetate (fluocinonide acetonide) with trifluoromethanesulfonic anhydride in the presence of trimethylsilyl trifluoromethanesulfonate as catalyst gave the ketone 3 and furan 4 arising from cleavage of the C9-C10 bond and aromatisation of the A ring, and fluocinonide 5. The ketone 3 was shown...
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