An expedient synthesis of 6-amino-5-[(4-hydroxy-2-oxo-2H-chromen-3-yl)(aryl)methyl]-1,3-dimethyl-2,4,6(1H,3H)-pyrimidinedione derivatives using Fe3O4@TiO2 nanocomposite as an efficient, magnetically separable, and reusable catalyst
H<sub>3</sub>PMo<sub>12</sub>O<sub>40</sub>‐immobilized chitosan/Co<sub>3</sub>O<sub>4</sub>: A novel and recyclable nanocomposite for the synthesis of pyrimidinedione derivatives
作者:Javad Safari、Mona Tavakoli、Mohammad Ali Ghasemzadeh
DOI:10.1002/aoc.4748
日期:2019.5
An efficient three‐component reaction of aromatic aldehydes, 6‐aminouracil/6‐amino‐1,3‐dimethyluracil and 4‐hydroxycoumarin in the presence of a novelheterogeneouscatalyst H3PMo12O40‐immobilized Co3O4/chitosan led to a synthesis of a new class of pyrimidinedione derivatives under reflux conditions. The magnetically recoverable nanocomposite of Co3O4/chitosan/H3PMo12O40 was fully characterized by
在新型非均相催化剂H 3 PMo 12 O 40固定化的Co 3 O 4 /壳聚糖催化下,芳族醛,6-氨基尿嘧啶/ 6-氨基-1,3-二甲基尿嘧啶和4-羟基香豆素的三组分有效反应回流条件下合成新型嘧啶二酮衍生物。Co 3 O 4 /壳聚糖/ H 3 PMo 12 O 40的可磁回收纳米复合材料通过傅立叶变换红外分光光度法,扫描电子显微镜,X射线粉末衍射,能量色散X射线光谱法,振动样品磁力法进行了全面表征和N2通过Brunauer-Emmett-Teller分析进行的吸附-解吸。结果表明,具有超顺磁性Co 3 O 4纳米粒子的Keggin型12钼磷酸被固定在交联壳聚糖的网络中。本方法具有许多优点,例如操作简单,反应时间短和产物的产率高。催化剂的新颖性,高催化活性,在外部磁场下易于与反应分离以及六次连续运行可重复使用,是该催化系统的其他环保特性。
l-Proline Derived Secondary Aminothiourea Organocatalyst for Synthesis of Coumarin Derived Trisubstituted Methanes: Rate Enhancement by Bifunctional Catalyst over Cooperative Catalysis
作者:Grace Basumatary、Rahul Mohanta、Ghanashyam Bez
DOI:10.1007/s10562-019-02809-4
日期:2019.10
l-proline derived aminothioureas are being used as catalyst in asymmetric synthesis, their applications in multicomponent reactions are not yet reported in the literature. We report herein a l-proline derived secondary aminothiourea as a multifunctional catalyst in multicomponent reaction for synthesis of coumarin-based unsymmetrical trisubstituted methanes whose prototype has been found to be acetylcholinesterase
Three-Component Green Reaction of Arylaldehydes, 6-Amino-1,3- Dimethyluracil and Active Methylene Compounds Catalyzed by Zr(HSO4)4 Under Solvent-Free Conditions
A convenient one-pot, three-component reaction of aromatic aldehydes, 6-amino-1,3-dimethyluracil and active methylene compounds in the presence of Zr(HSO4)4 as a heterogeneous catalyst, under solvent-free conditions brings a very simple and highly efficient method for the preparation of pyrimido[4,5-b]quinolines, pyrimido[5',4':5,6]pyrido[2,3- d]pyrimidines, indeno[2',1':5,6]pyrido[2,3-d]pyrimidines
Diversity oriented synthesis of tri-substituted methane containing aminouracil and hydroxynaphthoquinone/hydroxycoumarin moiety using organocatalysed multicomponent reactions in aqueous medium
作者:Ruchi Bharti、Tasneem Parvin
DOI:10.1039/c5ra13093j
日期:——
One-pot multicomponent reaction of aldehyde, 1,3-dimethyl-6-aminouracil and 2-hydroxy-1,4-naphthoquinone/4-hydroxycoumarin using a bifunctional thiourea-based organocatalyst in aqueous medium has been reported.
One-pot three-component reaction for facile and efficient green synthesis of chromene pyrimidine-2,4-dione derivatives and evaluation of their anti-bacterial activity
three-component synthesis of chromene pyrimidine-2,4-dione derivatives from available substrates catalyzed by heteropolyacid (H3PW12O40) is described. In this protocol, the reaction of diverse aldehydes, 4-hydroxycoumarin, and 4-amino-1,3-dimethyluracil in the mixture of EtOH / H2O (1:2) at room temperature in the presence of heteropolyacid (H3PW12O40) as a highly efficient catalyst affords the corresponding
摘要 描述了一种由杂多酸(H 3 PW 12 O 40)催化的可利用的底物容易且高效的一锅三组分合成亚甲基嘧啶-2,4-二酮衍生物的方法。在此方案中,在杂多酸(H 3)存在下,室温下EtOH / H 2 O(1:2)混合物中的各种醛,4-羟基香豆素和4-氨基-1,3-二甲基尿嘧啶的反应PW 12 O 40)作为高效催化剂以良好至优异的产率提供相应的色烯嘧啶-2,4-二酮。该方法的优点是操作简单,成本低,对环境友好,后处理和纯化容易,反应时间短,产物产率高,反应的绿色介质和温和的条件。获得了标题化合物对革兰氏阴性和革兰氏阳性菌分别对大肠杆菌(ATTC 35218)和金黄色葡萄球菌(ATCC 6538)的体外抗菌活性,并将它们的活性与庆大霉素和青霉素作参比药物进行了比较。 图形摘要