499-20-7Relevant articles and documents
New benzoic acid and caffeoyl derivatives with anti-inflammatory activities isolated from leaves of Ilex kaushue
Kakumu, Yuya,Mitsunaga, Tohru,Nguyen, Thi Minh Tu,Yamauchi, Kosei
, (2021/08/16)
A new benzoic acid, 3-[2-(2-hydroxyphenyl)acetoxy]benzoic acid (1), and two new caffeoyl derivatives, methyl (3E,5Z)-di-O-caffeoylquinate (2) and dhurrin 6′-O-caffeate (3), along with 20 known compounds were isolated from the leaves of Ilex kaushue collected in Vietnam. Their structures were elucidated on the basis of 1 D and 2 D NMR spectroscopy, and high-resolution MS spectrometry. The absolute configuration of 2 and 3 was unambiguously established by comparison of experimental and calculated ECD spectra and/or chemical reactivity. In addition, new compounds were evaluated for inhibitory effects of their tumor necrosis factor-α (TNF-α) production and cell cytotoxicity on lipopolysaccharide-induced RAW264 macrophage cells. All of those moderately suppressed TNF-α production in ratios of approximately 50% or higher at 25–100 μM, without cell cytotoxicity.
Taxiphyllin 6′-O-gallate, actinidioionoside 6′-O-gallate and myricetrin 2′-O-sulfate from the leaves of Syzygium samarangense and their biological activities
Mamdouh, Nabil Samy,Sugimoto, Sachiko,Matsunami, Katsuyoshi,Otsuka, Hideaki,Kamel, Mohamed Salah
, p. 1013 - 1018 (2015/02/19)
Three new compounds were isolated from a MeOH extract of the leaves of Syzygium samarangense, one new cyanogenic glucoside, taxiphyllin 6′-O-gallate (1), one new megastigmane glucoside, actinidioionoside 6′-O-gallate (2), and one new sulfated flavonoid rhamnoside, myricetrin 2″-O-sulfate (3), together with 14 known compounds, lupeol (4), demethoxymatteucinol (5), cryptostrobin (6), betulinic acid (7), β-sitosterol glucoside (8), 2R-prunasin (9), myrciaphenone A (10), 1-feruloyl-β-D-glucopyranoside (11), (3S,5R,6R,7E,9S)-3,5,6,9-tetrahydroxymegastigman-7-ene (12), guaijaverin (13), myricetin 4′-methyl ether 3-O-α-L-rhamno-pyranoside (14), myricetrin (15), gallic acid (16) and actinidioionoside (17). The structures of the new compounds were determined through a combination of spectroscopic, HPLC and chemical analyses.
