A Mild and Environmentally Benign Synthesis of Tetrahydrobenzo[<i>b</i>]pyrans and Pyrano[<i>c</i>]chromenes Using Pectin as a Green and Biodegradable Catalyst
Pectin was applied as a green and biodegradable catalyst for the one‐pot three‐componentsynthesis of tetrahydrobenzo[b]pyrans and pyrano[c]chromenes, from the condensation between aromatic aldehydes, malononitrile, and dimedone or 4‐hydroxycumarine at ambient temperature. This protocol has many advantages such as mildconditions, high yields, environmental benignity, simple work‐up procedures, short
果胶通过在环境温度下由芳族醛,丙二腈和二甲酮或4-羟基异丙基脲之间的缩合反应,用作绿色,可生物降解的催化剂,用于一锅三组分合成四氢苯并[ b ]吡喃和吡喃并[ c ]色烯。该方案具有许多优点,例如温和的条件,高收率,环境友好,后处理程序简单,反应时间短以及使用天然的,易于获得的,方便的操作和廉价的催化剂。该方法的另一个优点是产物不需要进一步纯化,例如柱色谱法。
Synthesis and Biological Properties of Pyranocoumarin Derivatives as Potent Anti-Inflammatory Agents
作者:Su Ji Min、Heesu Lee、Myoung-Sook Shin、Jae Wook Lee
DOI:10.3390/ijms241210026
日期:——
synthesize 23 coumarin derivatives and analyze their anti-inflammatory effects on lipopolysaccharide (LPS)-induced inflammation in RAW264.7 macrophages. A cytotoxicity test performed on LPS-induced RAW264.7 macrophages revealed that none of the 23 coumarin derivatives were cytotoxic. Among the 23 coumarin derivatives, coumarin derivative 2 showed the highest anti-inflammatory activity by significantly
An efficient one-pot synthesis of functionalized 2-amino-4H-pyrans by a meglumine-catalyzed three-component reaction has been developed. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatin derivatives, and acenaphthenequinone are condensed with enolizable C-H activated compounds and alkylmalonates to give the desired products in high to excellent yields. This methodology provides an alternative approach for rapid access to construct a diversity-oriented library of 4H-pyrans.
Fatahpour, Maryam; Hadavi, Mohammad Saeed; Hazeri, Nourallah, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2021, vol. 60, # 1, p. 127 - 135
Highly efficient three-component, one-pot synthesis of dihydropyrano[3,2-c]chromene derivatives
作者:Hong-Juan Wang、Jie Lu、Zhan-Hui Zhang
DOI:10.1007/s00706-010-0383-4
日期:2010.10
AbstractAn efficient and convenient method for synthesis of dihydropyrano[3,2-c]chromene derivatives by one-pot, three-component reaction of aldehydes, malononitrile, and 4-hydroxycoumarin in the presence of a catalytic amount of hexamethylenetetramine is reported. A variety of dihydropyrano[3,2-c]chromene derivatives were obtained in high to excellent yields within short times. Graphical abstract
摘要据报道,在催化量的六亚甲基四胺存在下,通过醛,丙二腈和4-羟基香豆素的一锅三组分反应,合成二氢吡喃并[3,2- c ]亚甲基苯衍生物的有效方法。在短时间内以高产率至优异产率获得了多种二氢吡喃并[3,2- c ]亚甲基苯衍生物。 图形概要