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
Synthesis of pyridinium-based salts: Catalytic application at the synthesis of six membered O-heterocycles
作者:Saeed Babaee、Mohammad Ali Zolfigol、Mahmoud Zarei、Maryam Abbasi、Zahra Najafi
DOI:10.1016/j.mcat.2019.110403
日期:2019.10
[PySO3H]FeCl4 as a magnetic molten salts was also investigated. Three categories of six membered O-heterocyclic compounds such as 2-amino-4H-chromene, 2-amino-4,8-dihydropyrano and 2-amino-4H-pyrans were prepared in the presence of a catalytic amount of the above said molten salts. These synthesized O-heterocyclic compounds are highly regarded due to their biological activities.
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