Base-catalysed aldol-type cyclization of 1-(2,4,6-trihydroxyphenyl)octane-1,3,5,7-tetraone (3) gives a benzophenone which undergoes cyclodehydration to form norlichexanthone (5); the sequence mimics steps involved in the biosynthesis of this and related metabolites.
R. M. Sandifer and T. M. Harris, J. Chem. Soc., Chem. Commun., 1979, 442 DOI: 10.1039/C39790000442
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