Development of new and efficient polymer-supported hypervalent iodine reagents

The aminomethylpolystyrene-supported (diacetoxyiodo)benzene reagents 4a and 4b were prepared for the first time. Using these reagents several hydroquinones and phenols can be oxidized to the corresponding quinones. Spirocyclization of phenylacetic acid and of N-protected tyrosine derivatives could also be accomplished.