Halogenatedp-quinols of marine sponges. Synthesis via anodic oxidation of phenols and NHI-like rearrangement
摘要:
Oxidation of either 2,6-dibromo- (1), 2-bromo- (3), or 2-bromo-6-chloro-p-acetamidophenol (5) at a Pt anode in aq. HClO4 affords the corresponding common, 2, or rare, 4 and 6, marine halo-p-quinols in practicable yields, whereas literature recipes as to either chemical or electrochemical oxidations proved to be ineffective; these halo-p-quinols proved to be extremely alkali-labile, in part due to a NHI-like rearrangement.