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A series of 2-methoxy and 2-methylphenols have been submitted to oxygenative oxidation reactions using (1) the λ 3 -iodane DIB, (2) a non-explosive and non-moisture sensitive version of the λ 5 -iodane IBX, named SIBX for Stabilized IBX, and (3) anodic oxidation with the aim of identifying the best reaction conditions for preparing orthoquinonoid cyclohexadienone synthons. Both the use of DIB and anodic oxidation appeared equally valuable for making orthoquinone dimethyl ketals, but the λ 3 - and λ 5 -iodane reagents are more appropriate to induce ortho-oxygenation of 2-methylphenols. In particular, SIBX emerged as a useful reagent for mediating ortho-hydroxylation into dimerizing orthoquinols, a tactic that can be applied to the synthesis of natural bis(monoterpenoids) such as aquaticol.

Iodane-mediated and electrochemical oxidative transformations of 2-methoxy- and 2-methylphenols