Nuclear oxidation in flavones and related compounds - Part XXI. Another synthesis of nobiletin
V V Sreerama Murti T R Seshadri
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A new synthesis of nobilein has been achieved employing the two stage process of ortho-oxidation. 5∶8-Dihydroxy-7∶3′∶4′-trimethoxy flavone (III) is condensed with hexamine to yield the 6-aldehyde (IV) which undergoes smooth oxidation with hydrogen peroxide to 7∶3′∶4′-trimethyl ether (V) of nornobiletin. Final methylation of (V) produces nobiletin (VI).
V V Sreerama Murti1 T R Seshadri1
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