Extensive SAR and Computational Studies of 3-{4-[(Benzylmethylamino)methyl]phenyl}-6,7-dimethoxy-2H-2-chromenone (AP2238) Derivatives
摘要:
AP2238 was the first compound published to bind both anionic sites of the human acetylcholinesterase, allowing the simultaneous inhibition of the catalytic and the amyloid-beta pro-aggregating activities of AChE. Here we attempted to derive a comprehensive structure-activity relationship picture for this molecule, affording 28 derivatives for which AChE and BChE inhibitory activities were evaluated. Selected compounds were also tested for their ability to prevent the AChE-induced A beta-aggregation. Moreover, docking simulations and molecular orbital calculations were performed.
Silver-catalyzed Double Decarboxylative Radical Alkynylation/Annulation of Arylpropiolic Acids with α-keto Acids: Access to Ynones and Flavones under Mild Conditions
Ynones are privileged buildingblocks in various organic syntheses of heterocyclicderivatives due to their multifunctional nature, and flavones are an important class of natural products with a wide range of biological activities. We describe the catalytic double decarboxylative alkynylation of arylpropiolic acids with α‐keto acids. With Ag(I)/persulfate as the catalysis system, the valuable ynones
disclose a metal‐free and efficient method for the direct conversion of 2‐propynolphenols to biologically important flavones using aqueous HI as the promoter. This transformation was proved via 4‐iodo‐2H‐chromenes intermediate, which was simultaneously conversed to corresponding flavones by a Csp2–I bond cleavage and a C–O bond formation under air.
An Expeditious Synthesis of Flavones on Montmorillonite K 10 Clay with Microwaves†‡
作者:Rajender S. Varma、Rajesh K. Saini、Dalip Kumar
DOI:10.1039/a709146j
日期:——
A manipulatively simple and rapid method for the synthesis of flavones is described via a solid-state dehydrative cyclization of o-hydroxydibenzoylmethanes on a clay surface using microwaves.
cleavage/intramolecular 6-endo-dig annulation/hydrocarbonylation for the synthesis of the valuable 2-aryl-4H-chromen-4-ones is described. This practical synthesis strategy utilizes propargylamines and air as the oxygen source and green carbonylation reagent, in which propargylamines are activated by the inexpensive and available dimethyl 2,2′-azobis(2-methylpropionate) (AIBME) and (PhSe)2 as the radical initiators
Synthesis of flavones <i>via</i> the Stork–Danheiser reaction
作者:Jianfeng Li、Ankun Zhou、Wenping Zhang、Xiaoting Wang、Ning Li
DOI:10.1039/d3ob00749a
日期:——
A new method to access flavones in a convergent fashion has been developed, based on the Stork–Danheiser reaction. By this method, 4-methoxy coumarins are allowed to react with organolithium at low temperatures (−78 °C to −40 °C) and then acidic workup gives the desired flavones in 18–86% yields. This method features transition metal-free conditions, readily available starting materials, and simple
基于 Stork-Danheiser 反应,开发了一种以收敛方式获取黄酮的新方法。通过这种方法,4-甲氧基香豆素可以在低温(-78 °C 至 -40 °C)下与有机锂反应,然后进行酸性处理,得到所需的黄酮,产率为 18-86%。该方法具有无过渡金属条件、起始原料易得、操作简单等特点。当需要快速生成 B 环黄酮衍生物时,它特别有效。