- New approach to flavonols via base-mediated cyclization: Total synthesis of 3,5,6,7-tetramethoxyflavone
-
A new methodology for the synthesis of flavonols is described. The key step is a base-mediated cyclization-isomerization-elimination reaction which results in the formation of flavonols. Using this strategy, three flavonols are synthesized and characteriz
- Kraus, George A.,Gupta, Vinayak,Kempema, Aaron
-
experimental part
p. 385 - 388
(2012/03/10)
-
- ANTIFUNGAL PHLOROGLUCINOL DERIVATIVES AND LIPOPHILIC FLAVONOIDS FROM HELICHRYSUM DECUMBENS
-
From the aerial parts of Helichrysum decumbens, three new antifungal phloroglucinol derivatives have been identified.Their structures have been established by UV, IR, EIMS, FAB-MS, 1H NMR and 13C NMR techniques.In addition, the highly methylated flavonoids 3,5-dihydroxy-6,7,8-trimethoxyflavone, 5,7-dihydroxy-3,6,8-trimethoxyflavone and 3,5-dihydroxy-6,7-dimethoxyflavone have been detected, the latter being a new naturally occurring compound.The phloroglucinols prevented the growth of Cladosporium herbarum in a bio-assay.These secondary metabolites are externally deposited on the plant surfaces. Key Word Index-Helichrysum decumbens; Compositae; prenylated phloroglucinols; antifungal compounds; lipophilic flavonoids; 3,5-dihydroxy-6,7-dimethoxyflavone.
- Tomas-Lorente, Francisco,Iniesta-Sanmartin, Esther,Tomas-Barberan, Francisco A.,Trowtizsch-Kienast, Wolfram,Wray, Victor
-
p. 1613 - 1616
(2007/10/02)
-
- SYNTHESIS OF 3,5,6,7-TETRAMETHOXYFLAVONE AND 4'-HYDROXY-3,5,6,7,3',5'-HEXAMETHOXYFLAVONE
-
Syntheses of 3,5,6,7-tetramethoxyflavone (1) and 4'-hydroxy-3,5,6,7,3',5'-hexamethoxyflavone (2), the constituents of Gomphrena martiana and Murraya paniculata, respectively, are described starting from 2-hydroxy-ω,4,6-trimethoxyacetophenone
- Sharma, P. K.,Khanna, R. N.,Pathak, V. P.
-
-
- FLAVANOIDS FROM THE LEAF RESIN OF ADENOSTOMA SPARSIFOLIUM
-
Four flavanoids were identified from the external leaf extract of Adenostoma sparsifolium: the two new flavones 3,7-dihydroxy-5,6-dimethoxyflavone and 3,5,7-trihydroxy-8-methoxyflavone and the known compounds galangin and pinocembrin.Key Word Index - Adenostoma sparsifolium; Rosaceae; flavonoids; 3,7-dihydroxy-5,6-dimethoxyflavone; 3,5,7-trihydroxy-8-methoxyflavone; galangin; pinocembrin
- Proksch, Margareta,Proksch, Peter,Weissenboeck, Gottfried,Rodriguez, Eloy
-
p. 1835 - 1836
(2007/10/02)
-