Neue pyron-derivate aus Helichrysum-arten

South African Helichrysum species: A review of the traditional uses, biological activity and phytochemistry

“…The presence of ␣-pyrones (12) is rather common (they occur in plants from morphologic groups 1, 2, 4, 12, 15, 18, 19 and 24) and they are often isolated from the roots of these plants (Hänsel et al, 1980;Jakupovic et al, 1986Jakupovic et al, , 1989. Different types of diterpenes occur; these include the kaurenoic acid type (15, Jakupovic et al, 1989) as well as those derived from helifulvanic acid (13, Bohlmann et al, 1980b).…”

Composition, Antioxidant Potential, and Antimicrobial Activity of Helichrysum plicatum DC. Various Extracts

“…dimethoxy- (49,53) and pentamethoxyflavones in DCME (46,47) and methoxy-(51, 52), dimethoxy- (50), and triethoxydimethoxy flavones in ACNE (54,55,57). [22] + + + arenol [23] + + + plicatipyrone analog [22] + arzanol [27] + + + heliarzanol [23] + + cycloarzanol [23] + helipyrone diacetate [25] + + methylarzanol [23] + + 3-[1-[3-acetyl-2,4,6-trihydroxy-5-(3-methyl-2-buten-1-yl)phenyl]ethyl]-6-ethyl-4-hydroxy-5-methyl-2H-pyran-2-one [23] + + auricepyrone [22], 23-methyl-6-O-desmethylauricepyrone [22] + helicerastripyrone [28] [29] + plicatipyrone analog [26]…”

“…Compound Class/Name EE DCME ACNE 2',3'-dihydroxypuberulin [31] + 7-(2,3-dihydroxy-3-methylbutoxy)-5-hydroxy-6-methoxy-2H-1-benzopyran-2-one [32] + + coumarin derivative [33,34] [37] + italipyrone [22] + italipyrone analog [22] + γ-pyrone (chromone) 3-(acetyloxy)-2,3-dihydro-5,7-dihydroxy-6-(3-methyl-2-butenyl)-2-phenyl-4H-1-benzopyran-4-one [38] + 2,3-dihydro-5,7-dihydroxy-3-methyl-8-(3-methyl-2-butenyl)-2-(1-methylethyl)-4H-1-benzopyran-4-one [39] + Flavonoid flavone apigenin-7-O-glucoside [4] + apigenin-5-O-glucoside [40] + luteolin [41] + 3,5,6,7,8-pentamethoxyflavone [42] + 3',4',5,6,7-pentamethoxyflavone [43] + apigenin [40] + dihydroxy-dimethoxyflavone [44] + jaceosidin [45] + chrysoeriol [45] + 5,7-dihydroxy-3-methoxyflavone [44] + 5,7,4'-trihydroxy-3,6-dimethoxy-3'-prenylflavone [46] + TEDMF 1 [43] [43] + flavanone naringenin-5-O-glucoside [40] + naringenin-4 -O-glucoside [48] + naringenin-7-O-glucoside [40] + eriodictyol [49] + naringenin [40] + + flavonol quercetin-3-O-glucoside [4], hyperoside (quercetin-3-O-galactoside) [4] + kaempferol-3-O-glucoside [50] + Table 1. Cont.…”

Dactylfungins, novel antifungal antibiotics produced by Dactylaria parvispora.

“…These XH and 13C chemical The 13C NMR shifts of C-l' (<5 76.5), C-2' (3 73.2), C-3' (3 74.6), C-5' (3 78.1) and C-6' (3 65. 5) suggested the presence of a polyalcohol moiety. An AB multiplet was observed for 4'-H2 at 3 1.65, 1.80, which showed long range coupling to C-2', C-3', C-5' and C-6' (Fig.…”