Reaction of a 5α-bromo-6β,19-epoxysteroid with BF3·Et2O/Ac2O

Reaction of 3β-acetoxy-5-bromo-6β,19-epoxy-5α-androstan-17-one with Ac2O and BF3·Et2O afforded the rearranged 3β,19-diacetoxy-6α-bromo-5-hydroxy-5β-androst-17-one in high yield.