Isolation of the first C-2 addition products of anthocyanins
โ Scribed by Yinrong Lu; L.Yeap Foo; Herbert Wong
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- French
- Weight
- 111 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0040-4039
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โฆ Synopsis
Addition of anthocyanins with nucleophilic agents normally occurs at the C-4 centre and the isolation of C-2 adducts between acetone and cyanidin-3-and delphinidin-3-rutinosides is the first definitive demonstration of the reactivity of this carbon site. These C-2 addition products were isolated as diastereoisomers and their chemical structures elucidated by 1D and 2D NMR spectroscopy.
๐ SIMILAR VOLUMES
A novel C-glycosylanthocyanin was isolated from the flowers of Tricyrtis formosana cultivar Fujimusume, and its structure was elucidated to be 8-C-b-D-glucopyranosylcyanidin 3-O-(6-O-malonyl)-b-D-glucopyranoside by chemical and spectroscopic methods.
irrndiiiled over 2 li ( L > 345 n m ) , during which additional ,V-methgl maleimide (3 x 2.5 ing. altogether 0.09 inmol) was added a t 30 min intervals The addition product \\a> is01;ited by flash chromatography on silica gel with ether,'cyclohexane ( 2 . 1 ) . 9: A solii~ion of 3 ( I S nig. 0.051 m