Minor Flavanones from Erythrina abyssinica

Abstract

Four new prenylated flavanones, abyssinone-V 4'-methyl ether (1) and abyssinoflavanones IV (2), V (3), and VI (4), have been isolated as minor flavanones from the African medicinal plant, Erythrina abyssinica, together with a known flavanone, sigmoidin D. The structure elucidation of compounds 1-4 by spectroscopic studies is described.

Four new prenylated flavonoids from the roots of Cudrania tricuspidata

“…The CD spectrum of 2 showed positive cotton effects at 331 and 252 nm, as well as negative cotton effects at 295 and 243 nm (Fig. ), suggesting that the absolute configurations at C‐2 and C‐17 were both S configurations . Thus, the structure of 2 was deduced as (2S,17S) ‐2′,5,5″,7‐tetrahydroxy‐6‐prenyl‐6″,6″‐dimethyl‐4″,5″‐dihydropyrano[2″,3″:4′,5′]flavanone, trivial named cudraflavanone F.…”

“…Compound 1 features a flavanone skeleton fused a furan ring in the B‐ring. This skeleton was first reported from the stem bark of Erythrina abyssinica , and compound 1 was the third natural product with such a rare skeleton. We proposed the biogenetic pathway of 1 (Fig.…”

In Vitro Antimicrobial Activity of Crude Extracts of Erythrina abyssinica and Capsicum annum in Poultry Diseases Control in the South Western Agro-Ecological Zone of Uganda

“…This agrees with findings by Masola et al, 2009 andOgundare et al, (2006). Moriyasu et al, (1998) collected stem bark E.abyssinica from Meru district of Kenya. They carried structural elucidation of new flavanones isolated from E.abyssinica and found presence of prenylated flavanones (abyssinin I(1), II (2), III(3), along with abyssinone V, sigmoidin A, B, C and F, and sigmoidin B 4´-(methyl ether).…”

Cytotoxic Prenylated Flavonoids from the Stem Bark of Maackia amurensis

“…The circular dichroism (CD) spectrum showed a positive Cotton effect at 350 nm and a negative one at 290 nm, consistent with the S-configuration at C-2. [5][6][7] On the basis of the data obtained, compound 1 was assigned as (2S)-5,2Ј-dihydroxy-7-methoxy-8-(3-methylbut-2-enyl)-2ٞ,2ٞ-dimethylpyrano[5ٞ,6ٞ : 5Ј,4Ј] flavanone, named maackiaflavanone A.…”