A prenylated flavanone from roots of Maackia amurensis subsp. Buergeri

Antibacterial Pterocarpans from Erythrina subumbrans

“…The hexane and CH 2 Cl 2 extracts on chromatography over silica gel gave seven pterocarpans, two flavanones and one isoflavone. These compounds were identified as erybraedin B (1) (Mitscher et al, 1988a), erybraedin A (2) (Mitscher et al, 1988a), phaseollin (3) (Perrin, 1964), erythrabyssin II (4) (Tanaka et al, 1998), erystagallin A (5) (Tanaka et al, 1997), erythrabissin-1 (6) (Fomum et al, 1986), erycristagallin (7) (Mitscher et al, 1984), 5-hydroxysophoranone (8) (Baruah et al, 1984;Matsuura et al, 1994), glabrol (9) (Asada et al, 2000) and erysubin F (10) (Tanaka et al, 2001a) by comparison of their physical and spectroscopic data with those reported in the literature. Interestingly, we were also able to obtain two more pterocarpenes, named eryvarin E (11) (Tanaka et al, 2001b) and eryvarin D (12) (Tanaka et al, 2001b;Yenesew et al, 2003) as artifacts, leaving compounds 5 and 6 respectively in CDCl 3 after a few weeks.…”

Erythrina Alkaloids and a Pterocarpan from the Bark of Erythrina subumbrans

“…The known compounds were identified as erythrabyssin II, erybraedin A, erystagallin A, erycristagallin, erythrabissin-1, eryvarin A, hydroxycristacarpone, 5-hydroxysophoranone, , abyssinone V, , lespedezaflavanone B, sophoradiol, , soyasapogenol B, – lupeol, and vogelin C by comparison of their spectroscopic data with reported values.…”

Cytotoxic Prenylated Polyphenolic Compounds from Maackia amurensis Root Bark

“…13 C NMR analyses (Tables 1, 2). The сhemical shifts of protons and carbon atoms of isoprenyl substituents for structures of compound 1 and maackiaflavanone (4) [16] are very similar, and their positions at C-8 and C-5' in 1 and 4 respectively were confirmed. There was a correlation between the proton at the C-3' and the protons of OCH 3 group in NOESY spectrum of 1.…”