3101-98-2Relevant academic research and scientific papers
Extraction, Isolation and Characterization of Valuable Worked on Acacia Tortilis
Muhaisen, Hasan M. H.
, p. 6731 - 6747 (2021/11/01)
Acacia tortilis is one of the important species of genus Acacia belonging to family Leguminaceae. Though there is no more study performed on this plant but it plays important role in the countries where it found. These countries include North Africa, Arabian Peninsula and Asian countries. The various part of Acacia tortilis plant say leaves, pods, gum exudates and bark were used as antidiabetic, antidiarrhoeal, antiasthmatic and also had several other medicinal benefits. The present discussion deals with the isolation and characterization of the following compounds from the leaves of Acacia tortilis. Lupan-3-ol, 12,20-diene, Lupan-12, 20-dien 3-one, Friedelin, ?-amyrin, ?- sitosterol, Apigenin, Luteolin, Quercetin, 5,7-dihydroxy-4-p-methyl benzylisoflavone, Vitexin, 2',6'-dihydroxy chalcone-4'-O-glucoside.
Evolvosides C-E, flavonol-4-O-triglycosides from Evolvulus alsinoides and their anti-stress activity
Gupta, Prasoon,Sharma, Upasana,Gupta, Praveen,Siripurapu, Kiran Babu,Maurya, Rakesh
, p. 1116 - 1122 (2013/03/14)
Phytochemical investigation of the n-butanol fraction of Evolvulus alsinoides (Linn.) led to the isolation of three new phenolic glycosides, evolvosides C, D and E (1-3) along with six known compounds (4-9). The structures of the compounds were elucidated
Glycosyl Imidates, 69. - Synthesis of Flavone C-Glycosides Vitexin, Isovitexin, and Isoembigenin
Mahling, Juergen-Andreas,Jung, Karl-Heinz,Schmidt, Richard R.
, p. 461 - 466 (2007/10/02)
2-Hydroxy-4,6-dimethoxyacetophenone (4) was glycosylated with O-(2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl) trichloroacetimidate (5) and trimethylsilyl triflate as promoter to yield directly the C-glycoside 6.Construction of the flavone system by application of a Baker-Venkataraman-type rearrangement followed by deprotection yielded isoembigenin (2).Glycosylation of 4,6-bis(tert-butyldimethylsilyloxy)-2-hydroxyacetophenone (17) with the trichloroacetimidate 5 afforded the O-glycoside intermediate 18 which was converted via Fries rearrangement into the C-glycoside 21.Applying again the Baker-Venkataraman rearrangement and cyclization gave isovitexin and vitexin derivatives 25 and 26, which were completely deprotected to yield isovitexin (1b) and vitexin (1a), respectively. - Key Words: Glycosides / Flavones / Vitexin / Isovitexin / Isoembigenin / Carbohydrates / Trichloroacetimidates / Fries rearrangement / Baker-Venkataraman rearrangement
THE ROTATIONAL ISOMERS OF PERACETYLATED C-GLYCOSYLFLAVONES
Kato, Takeshi,Morita, Yutaka
, p. 965 - 973 (2007/10/02)
In 1H- and 13C-nmr of peracetylated 8-C- and 6-C-glycosylflavones, the signal doublings were observed due to the restricted rotation of the acetylated glucosyl moiety.The conformations of rotational isomers of hepta-O-acetylvitexin and octa-O-acetylorientin were decided as +sp (major) and -sc (minor) for both compounds by nmr (CDCl3) spectral data.The characteristic chemical shift phenomena in nmr of glycosylflavonoid could be applicable to differentiate 8-C-glucoside from 6-C-glucoside.
