Efficient Phenylsulfenylation and Phenylselenenylation at the 5-Position of Uracil Nucleosides with Disulfide and Diselenide Mediated by [Bis(Trifluoroacetoxy)iodo]Benzene
A series of uracil nucleosides reacted with diphenyl disulfide or diphenyl diselenide in the presence of hypervalent iodine reagent, [bis(trifluoro-acetoxy)iodo]benzene, in acetonitrile to give the corresponding C-5 phenylsulfenylated or phenylselenenylated products respectively in excellent yields.