在本研究中,合成了具有高表面积和窄孔径分布的高序正丙基-1,4二氮杂二环[2.2.2]辛烷氯化物官能化的介孔SBA-15,SBA-DABCO,并通过TEM,SEM对其进行了表征。 ,FT-IR,CHN,TGA,XRD和BET。有机改性的SBA-15具有六方晶体学顺序,孔径最大为54.2Å,DABCO基团的含量最大为1.38 mmol g -1。该催化剂显示出对环境无害的特征,可以容易地制备,储存和回收该催化剂,而活性没有明显的损失。合成的碱性有机催化剂提供了一种绿色和有用的方法,用于在水性介质中一锅合成吡喃环化的杂环化合物,尤其是螺氧杂吲哚吡喃化合物。本方案的重要特征是简单,对环境无害,产率高,没有色谱分离和催化剂的可回收性。
method for the synthesis of 2-aminochromene by the one-pot, three-component reaction of an aromatic aldehyde, malononitrile, and α- or β-naphthol in the presence of a catalytic amount of disodiumhydrogenphosphate under solvent-free conditions is described.
The one-pot photocatalytic synthesis of benzo[f]chromene was performed at room temperature by the addition of benzyl alcohol, malononitrile and β-naphthol in contact with an illuminated nano-SnO2/TiO2 composite. This study illustrated the potential of photochemicalsynthesis of benzo[f]chromene. A simple procedure was proposed for the synthesis of a nano-SnO2/TiO2 composite using the sol–gel method
在室温下,通过加入苄醇,丙二腈和β-萘酚与光照的纳米SnO 2 / TiO 2复合材料接触,进行一锅法苯并[ f ]苯甲基的光催化合成。这项研究说明了光化学合成苯并[ f ]色烯的潜力。提出了一种简单的程序,通过溶胶-凝胶法通过氯化锡(IV)和钛(IV)的水解来合成纳米SnO 2 / TiO 2复合材料。在室温下,在聚乙二醇200,二乙醇胺和蒸馏水的存在下氯化)。利用扫描电子显微镜(SEM),X射线衍射(XRD)和FT-IR表征了所提出的光催化剂。
Green chemistry approach: sodium fluoride-catalyzed highly efficient microwave irradiation-assisted synthesis of substituted chromene derivatives in aqueous medium
作者:K. Fabitha、C. G. Arya、Munugala Chandrakanth、Janardhan Banothu
DOI:10.1007/s11164-022-04929-w
日期:2023.3
applications in medicinal chemistry. The multicomponent Knoevenagel–Michael reaction is one of the most efficient strategies to construct these two scaffolds. Previous efforts have been made in converting the traditional organicsolvents to eco-friendly solvents including H2O generally in the presence of complex catalysts. Here we present our work of using sodium fluoride (NaF) as the catalyst to synthesize
2-Amino-4 H -benzo[ H ]chromene-3-carbonitrile 和 2-amino-5-oxo-4 H ,5 H -pyrano[3,2- c ]chromene-3-carbonitrile 是两个重要的药效团,具有广泛的在药物化学中的应用。多组分 Knoevenagel-Michael 反应是构建这两种支架的最有效策略之一。之前已经在将传统有机溶剂转化为包括 H 2在内的环保溶剂方面做出了努力O 通常在复杂的催化剂存在下。在这里,我们介绍了我们使用氟化钠 (NaF) 作为催化剂从 α-或 β-萘酚或 4-羟基香豆素开始合成范围广泛的两种底物的工作。在微波辐射条件下使用 12 mol% NaF,反应在 15-25 分钟内完成,所有产率均超过 85%。通过用H 2 O洗涤简单地纯化反应产物并且可以通过用MeOH结晶进一步纯化。对绿色化学相关参数的分析表明,目前
Karami, Bahador; Farahi, Mahnaz; Bazrafshan, Masoomeh, South African Journal of Chemistry, 2014, vol. 67, p. 109 - 112