Abstract
The autoxidation of 3-hydroxyanthranilic acid (3OHA) in the presence of tyrosine, p-cresol, or p-ethylphenol gives dibenzo[b,d]pyran-6-one products that arise from the coupling of the radical of 3OHA with that derived from the substituted phenol. As a proof of the structure of these adducts, they have been independently synthesized by employing a palladium(0)-catalyzed coupling of appropriately functionalized aryl boronic acids with methyl 6-bromo-3-methoxy-2-nitrobenzoate
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