Pummerer-type rearrangement on aromatic rings: an unprecedented ipso-substitution of the sulfinyl group of p-sulfinylphenyl ethers into oxygen functional groups leading to protected dihydroquinone derivatives

Abstract

The treatment of p-(phenylsulfinyl)phenyl ethers 1 with trifluoroacetic anhydride in the presence of styrene selectively caused the direct ipso-substitution of the sulfinyl groups by trifluoroacetoxy groups, giving the protected dihydroquinone derivatives 3 in high to quantitative yields.