Abstract
Cycloaddition reactions of labelled 6-methoxy-3-methyl-2-pyrone (1) with naphthoquinones provide the common fungal anthraquinones, chrysophanol (2), islandicin (3), and emodin (4) suitably labelled for biosynthetic studies, as demonstrated by synthesis and incorporation of [methyl-2H3]chrysophanol into the xanthone metabolite, tajixanthone (17) in Aspergillus variecolor.
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