Peracetylation of polyphenols under rapid and mild reaction conditions
作者:Douglas Chaves de Alcântara Pinto、Paulo Pitasse-Santos、Gabriela Alves de Souza、Rosane Nora Castro、Marco Edilson Freire de Lima
DOI:10.1080/14786419.2022.2031186
日期:——
polyphenols under mild reactionconditions by using acetic anhydride, catalytic amount 4-dimethylaminopyridine (DMAP) and dimethylformamide (DMF) as solvent. Reactionconditions were adjusted for optimal formation of peracetylated polyphenols while minimizing the formation of byproducts. Butyric anhydride was employed as an alternative acylating agent and showed similar results. Reaction yields varied
摘要 结构修饰是研究天然多酚特性的重要工具。关于乙酰酯的制备,通过分子内氢键稳定的羟基的存在可能会对这些化合物的全乙酰化造成障碍。在本文中,我们提出了一种简单的方案,使用乙酸酐、催化量的 4-二甲基氨基吡啶 (DMAP) 和二甲基甲酰胺 (DMF) 作为溶剂,在温和的反应条件下乙酰化选定的多酚。调整反应条件以获得全乙酰化多酚的最佳形成,同时最大限度地减少副产物的形成。丁酸酐被用作替代酰化剂并显示出类似的结果。反应产率从 78% 到 97% 不等,并且根据 LCMS(ESI+) 测定,获得了高纯度的产物,1 H NMR 和13 C NMR。
Method for liquid authentication by detection of flavonoid derivatives
申请人:SICPA HOLDING SA
公开号:US10800988B2
公开(公告)日:2020-10-13
A Liquid, comprising an hydrophobic flavonoid derivative electrochemically non-active, that is capable of restoring its electrochemical activity, the concentration of the flavonoid derivative being 10 ppm by weight or less, and an organic substance in an amount of 90% by weight or more.
Biophysical studies of the interaction of hRSV Non-Structural 1 protein with natural flavonoids and their acetylated derivatives by spectroscopic techniques and computational simulations
作者:Isabella Ottenio de Lourenço、Evelyn Toscano Pedroso Quintino、Matheus Henrique Pereira、Caroline Sprengel Lima、Gabriela Campos Araújo、Luis Octávio Regasini、Fernando Alves de Melo、Fátima Pereira de Souza、Marcelo Andres Fossey、Ícaro Putinhon Caruso
DOI:10.1016/j.saa.2022.121751
日期:2022.12
interacting with proteins in the type I interferon pathway. The influence of NS1 on the cell’s immune response denotes the potential of its inhibition, being a possible target of treatment against hRSV infection. Here, it was studied the interaction of hRSV NS1 with naturalflavonoids chrysin, morin, kaempferol, and myricetin and their mono-acetylated chrysin and penta-acetylated morin derivatives using spectroscopic