Chemical Synthesis of Hydroxycinnamic Acid Glucosides and Evaluation of Their Ability To Stabilize Natural Colors via Anthocyanin Copigmentation
摘要:
This work describes the chemical synthesis of O-aryi-beta-D-glucosides and 1 -O-beta-D-glucosyl esters of hydroxycinnamic acids. In particular, OLaryl-beta-D-glucosides were efficiently prepared via a simple diastereoselective glycosylation procedure using phase transfer conditions. Despite the lability of its ester linkage, 1-O-beta-D-caffeoylglucose could also be obtained using a Lewis acid catalyzed glycosylation step and a set of protective groups that can be removed under neutral conditions. Hydroxycinnamic acid O-aryl-beta-D-glucosides were then quantitatively investigated for their affinity for the naturally occurring anthocyanin malvin (pigment). Formation of the pi-stacking molecular complexes (copigmentation) was characterized in terms of binding constants and enthalpy and entropy changes. The glucosyl moiety did not significantly alter these thermodynamic parameters, in line with a binding process solely involving the polyphenolic nuclei.
this issue, we created three novel synthetic cascades for the biosynthesis of phenolic glycosides (gastrodin, arbutin, and salidroside) and their derivatives (hydroquinone, tyrosol, hydroxytyrosol, and homovanillyl alcohol) fromp-coumaricacid and ferulic acid. Moreover, because the biomass-derived hydroxycinnamates directly provided aromatic units, the cascades enabled efficient biosynthesis. We achieved
Constituents of pollen. XI. Constituents of Cryptomeria japonica D. Don.
作者:TAICHI OHMOTO、OHGI YOSHIDA
DOI:10.1248/cpb.31.919
日期:——
A new biflavone, 5'''-hydroxyamentoflavone, was isolated, together with naringenin, apigenin, luteolin, 2, 3-dihydroamentoflavone, amentoflavone, afzelin, cosmosiin, quercitrin, and 4-β-D-glucopyranosyloxyferulic acid, from pollen grains of Cryptomeria japonica D. DON.
从花粉粒中分离出一种新的双黄酮,5'''-羟基amentoflavone,以及柚皮素、芹菜素、木犀草素、2, 3-二氢amentoflavone、amentoflavone、afzelin、cosmosiin、槲皮苷和4-β-D-glucopyranosyloxyferulic Acid。日本柳杉 D. DON。
Loganin, loganic acid and periclymenoside, a new biosidic ester iridoid glucoside fromLonicera periclymenumL. (Caprifoliaceae)
作者:Ihsan Calis、Mohamed F. Lahloub、Otto Sticher
DOI:10.1002/hlca.19840670119
日期:1984.2.1
Loganin (1), loganic acid (2), and periclymenoside (3) have been isolated from Lonicera periclymenumL. The structure of the new compound 3 and the identity of the others have been determined by chemical transformations and interpretation of the spectral data.