- Preparation of 4,6,3',4'-tetrasubstituted aurones via aluminium oxide-catalyzed condensation
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4,6,3',4'-Tetrasubstituted aurones were prepared by a protection- deprotection route with an alumina-catalyzed condensation of 3(2H)-benzofuranones with substituted aldehydes as the key step. Aureusidin (6) was obtained by demethylation of 4,6,3',4'-tetramethoxyaurone (5), a natural product from Cyperus capitatus. 4,6,3',4'-Tetrabenzyloxyaurone (9) was converted in a one hydrogenation-deprotection step to dihydroaureusidin (10).
- Bolek, David,Guetschow, Michael
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p. 1399 - 1403
(2007/10/03)
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- Non-lithiation route to naturally occuring 5,7-dimethoxyphthalide
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A non-lithiation route has been described for the synthesis of naturally occurring 5,7-dimethoxyphthalide (10) starting from ethyl orsellinate (1) involving simple reactions and less expensive reagents.
- Kumaran, G.,Kulkarni, G. H.
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p. 436 - 437
(2007/10/02)
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