一种原子经济,选择性和方便的单罐操作规程,可用于合成具有医学优势的新型chromeno [2,3- d ]嘧啶支架,即巴比妥酸衍生物,1,3环二酮和各种醛的多组分反应据报道,室温下水介质中存在四正丁基碘化铵(TBAI)作为电解质。这种具有生态学意义的新颖概念提供了对环境无害的合成路线,较短的反应时间和简便的后处理步骤,且收率极高(88%至90%),并且还有利于面向多样性的大规模流程。通过IR,MS,NMR和CHN分析对合成产物进行表征。
Green and rapid synthesis of dihydropyrimido [4,5‐
<i>b</i>
]quinolinetrione derivatives using CoFe
<sub>2</sub>
O
<sub>4</sub>
@PPA as high efficient solid acidic catalyst under ultrasonic irradiation
作者:Leila Moradi、Pegah Mahdipour
DOI:10.1002/aoc.4996
日期:2019.8
A new high efficient and green protocol for the preparation of dihydropyrimido[4,5‐b]quinolinetrione derivatives using magnetically solid acid catalyst was presented. High performance solid acid catalyst was prepared through a three‐step reaction. Firstly, CoFe2O4 nano particles were synthesized using co‐precipitation method. In second step, CoFe2O4 nano particles were coated with SiO2 shell through
提出了一种使用磁性固体酸催化剂制备二氢嘧啶基[4,5- b ]喹啉三酮衍生物的新型高效绿色方案。通过三步反应制备了高性能固体酸催化剂。首先,采用共沉淀法合成了CoFe 2 O 4纳米颗粒。在第二步骤中,通过用原硅酸四乙酯(CoFe 2 O 4 @SiO 2)处理,用SiO 2壳涂覆CoFe 2 O 4纳米颗粒。最后,用多磷酸(CoFe)对CoFe 2 O 4 @SiO 2进行了改性。2 O 4 @SiO 2 / PPA)。使用FTIR,VSM,TEM,FESEM,EDX对绿色可重复使用的催化剂进行了详细表征,并用作合成二氢嘧啶基[4,5- b ]喹啉三酮衍生物的催化剂。在绿色,有效和温和的条件下,在超声辐射下进行反应,并以高至极好的收率获得了产物。该方法具有绿色环保的条件,反应时间短,产物收率高,而且易于操作。
Sc(OTf)<sub>3</sub>catalysed multicomponent synthesis of chromeno[2,3-<i>d</i>]pyrimidinetriones under solvent-free condition
Abstract An efficient, simple, and environmentally friendly synthesis of a series of chromeno[2,3-d]pyrimidine-trione derivatives has been accomplished via the three-component reaction of a barbituric acid, dimedone/cyclohexane-1,3-dione, and aromatic aldehydes using Sc(OTf)3 as a recyclable catalyst undersolvent-free condition. This method exploits the use of Sc(OTf)3 as a Lewisacid catalyst in
A simple and one-pot synthesis of new chromeno[2,3-d]pyrimidine-triones by a three-component condensation reaction of barbituric acids, aldehydes and cyclohexane-1,3-diones in refluxing ethanol in the presence of p-toluenesulfonic acid (p-TSA) for 3—10 h is reported. Two cyclohexane-1,3-diones, four barbituric acids and six substituted aldehydes were chosen for the library validation. Prominent among the advantages of this new method are operational simplicity, good yields and easy work-up procedures employed.
One‐pot three‐component synthesis of chromeno [2,3‐
<scp>
<i>d</i>
</scp>
] pyrimidine derivatives: Novel, simple, and efficient electrochemical approach
作者:Jyoti Malviya、Rana Krishna Pal Singh
DOI:10.1002/jhet.3741
日期:2020.1
An atom economical, selective, and convenient one‐pot protocol for the synthesis of the medicinally privileged novel chromeno [2,3‐d] pyrimidine scaffold, viz, multicomponent reaction of barbituric acid derivatives, 1,3 cyclic diketone, and various aldehydes in the presence of tetra n‐butyl ammonium iodide (TBAI) as an electrolyte in water media under room temperature, is reported. This ecologically
一种原子经济,选择性和方便的单罐操作规程,可用于合成具有医学优势的新型chromeno [2,3- d ]嘧啶支架,即巴比妥酸衍生物,1,3环二酮和各种醛的多组分反应据报道,室温下水介质中存在四正丁基碘化铵(TBAI)作为电解质。这种具有生态学意义的新颖概念提供了对环境无害的合成路线,较短的反应时间和简便的后处理步骤,且收率极高(88%至90%),并且还有利于面向多样性的大规模流程。通过IR,MS,NMR和CHN分析对合成产物进行表征。