pharmacological study of the in vivo anticoagulant effect of the derivatives with respect to warfarin showed that the synthesized compounds have different anticoagulantactivities. The most prospective compounds are 3‐(3′‐hydroxybenzylidene)‐2,4‐diketochroman 4 and 3,3′‐(2‐pyridylmethylene)‐bis‐4‐hydroxy‐2H‐1‐benzopyran‐2‐one 11 with low toxicity and dose‐dependent anticoagulantactivity in vivo.
Abstract In this article, we have established a highly promising approach for the synthesis of biscoumarins via domino Knoevenagel–Michael condensation of 4-hydroxycoumarin and aromatic aldehydes in 2:1 ratio using carbon-SO3H as a solid acid catalyst in H2O: EtOH (1:1). This new protocol produced α,ά-benzylidene bis(4-hydroxycoumarin) derivatives in high to excellent yields. For this, carbon-SO3H
Background: Biscoumarin scaffolds are known for their promising pharmacological properties. These compounds have not been studied for their activity against tuberculosis strains. Objective: Unveil the antitubercular properties of biscoumarin scaffolds. Methods: Biscoumarin derivatives (3a-3l) were synthesized using lemon juice as a catalyst and were investigated for their in-vitro anti-tubercular activity
背景:双香豆素支架因其有希望的药理特性而闻名。尚未研究这些化合物对结核菌株的活性。 目的:揭示双香豆素支架的抗结核特性。 方法:以柠檬汁为催化剂合成双香豆素衍生物(3a-3l),并使用微孔板阿拉法蓝测定法(MABA)研究其对结核分枝杆菌H 37 R v菌株的体外抗结核活性。通过分子对接研究,使用InhA和PDB-ID:2NSD作为Hsub> 37中的靶受体,研究了它们的结合相互作用。
Design and synthesis of bis-coumarinyl methanes from 4-hydroxy-coumarin and aldehydes catalysed by Amberlyst 15 via dual C–C coupling: introducing coumarin based thin film organic nano-materials for memory devices
derivatives was investigated by condensing a series of aldehydes with 4-hydroxy coumarin in the presence of Amberlyst 15 catalyst under refluxing conditions in ethanol–water (1:1). This one pot domino Knoevenagel condensation/Micheal addition reaction provides excellent yield of bis-coumarinyl methane derivatives with lots of advantages like shorter reaction time, eco-friendly reaction medium, simple work up
Sulfated titania catalyzed water mediated efficient synthesis of dicoumarols—a green approach
作者:Bikash Karmakar、Anupam Nayak、Julie Banerji
DOI:10.1016/j.tetlet.2012.06.024
日期:2012.8
An efficient, mild, and environmental friendly method has been developed for the synthesis of dicoumarols in water over Lewis and Bronsted acid catalyst sulfated titania (TiO2/SO42-). The method involves the condensation of various aromatic and aliphatic aldehydes with 4-hydroxycoumarin. It affords the corresponding product in high yield with short reaction times employing a very low loading of catalyst. The catalyst was reused several times without significant change in activity. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.