The preparation of pharmaceutically active 2-amino-4H-chromene derivatives has been achieved using a nano powder of natural clinoptilolite (CP) zeolite. A wide range of these worthy structures having diverse substituents on the 4H-chromene ring were efficiently synthesized via the reaction of an aromatic aldehyde and variety of enolizable C–H activated acidic compounds. Nano sized natural clinoptilolite
A green, efficient and mild one-potsynthesis of pyrano[3,2-b]pyran derivatives via a three component reaction in the ionicliquid [bmim]BF4 is reported. This method has the advantages of environmental friendliness, operational simplicity, high yields and reuse of the ionicliquid.
Fe3O4@SiO2-BenzIm-Fc[Cl]/ZnCl2: a novel and efficient nano-catalyst for the one-pot three-component synthesis of pyran annulated bis-heterocyclic scaffolds under ultrasound irradiation
作者:Mahdi Gholamhosseini-Nazari、Somayeh Esmati、Kazem D. Safa、Alireza Khataee、Reza Teimuri-Mofrad
DOI:10.1007/s11164-018-3704-6
日期:2019.4
synthesized using a novel nano-catalyst via the condensation reaction of different aldehydes, malononitrile and 4-hydroxycoumarin. Kojic acid was also used in the three-component reaction for the synthesis of pyrano[3,2-b]pyran derivatives. The method was successful in the synthesis of various pyrano[2,3-d]pyrimidine derivatives. Additionally, new ultrasound-assisted synthesis protocol was used for the
在这项研究中,使用一种简单的化学共沉淀方法合成了一种新型的可磁恢复的Fe 3 O 4 @SiO 2 -BenzIm-Fc [Cl] / ZnCl 2纳米颗粒。在纳米粒子的FT-IR光谱中,出现了相关的吸收峰,这证实了纳米催化剂的成功合成。在纳米催化剂的EDX光谱中,在其区域上出现了预期的元素。纳米催化剂的X射线衍射图谱表明Fe 3 O 4的晶体分散磁性纳米粒子。根据FE-SEM和TEM图像,纳米颗粒具有相对的单分散性,并且纳米颗粒的平均尺寸为约35nm。在超声波照射下,在多种吡喃环化的双杂环衍生物(38种化合物)的一锅三组分合成中评估了新型磁性纳米粒子的催化活性。引入了一种简单,高效的面部超声辅助方法,用于在室温下通过一锅三组分反应合成稠合的双杂环吡喃衍生物。一系列吡喃[3,2- c通过不同的醛,丙二腈和4-羟基香豆素的缩合反应,使用新型的纳米催化剂合成了] 1,1-二甲基萘衍生物。曲酸还用于三组分反应中,以合成吡喃并[3
One‐pot synthesis of 2‐amino‐4,8‐dihydropyrano[3,2‐b]pyranes and pyridopyrimidines under mild conditions
作者:Fatemeh Rigi、Hamid Reza Shaterian
DOI:10.1002/jccs.201800048
日期:2019.4
was applied for the one‐pot, three‐component synthesis of 2‐amino‐4,8‐dihydropyrano[3,2‐b]pyrane‐3‐carbonitriles and pyridopyrimidines, under solvent‐free conditions. The reaction was carried out at room temperature, and pure products were obtained in high yields and short reaction times (3–7 min). This work introduced an environmentally benign procedure for the synthesis of these classes of biological
Synthesis, characterization, and application of Cu<sub>2</sub>O and NiO nanoparticles supported on natural nanozeolite clinoptilolite as a heterogeneous catalyst for the synthesis of pyrano[3,2-b]pyrans and pyrano[3,2-c]pyridones
作者:Seyed Meysam Baghbanian
DOI:10.1039/c4ra10537k
日期:——
In this research, Cu2O and NiO nanoparticles supported on natural nanozeolite clinoptilolite (CP) was found to be a recoverable catalyst system for synthesis of pyrano-[3,2-c]pyridone and pyrano[3,2-b]pyran derivatives in aqueous media. The nanocatalysts were characterized by various techniques such as XRD, BET, SEM, TEM, TEM-EDS, and XPS analyses. TEM study reveals that the Cu2O and NiO nanoparticles
在这项研究中,发现负载在天然纳米沸石斜发沸石(CP)上的Cu 2 O和NiO纳米颗粒是可合成吡喃并[3,2- c ]吡啶酮和吡喃并[3,2- b ]吡喃衍生物的催化剂体系。在水性介质中。纳米催化剂通过各种技术进行表征,例如XRD,BET,SEM,TEM,TEM-EDS和XPS分析。TEM研究表明,Cu 2 O和NiO纳米颗粒的粒径小于10 nm。XRD和XPS表征表明存在Cu 2形式天然纳米沸石CP表面的O或NiO。催化剂的容易回收和产物的高产率使该方案具有吸引力和经济性。此外,纳米催化剂可以循环使用几次,而不会显着降低其催化活性。