Borax catalyzed domino reactions: synthesis of highly functionalised pyridines, dienes, anilines and dihydropyrano[3,2-c]chromenes
作者:Aniruddha Molla、Sahid Hussain
DOI:10.1039/c4ra03627a
日期:——
Borax, an innocuous, inexpensive, and a naturally occurring material, very efficiently catalyzes the Knoevenagel condensation and Michael addition in domino fashion for the construction of highly functionalised pyridines, dienes, anilines and dihydropyrano[3,2-c]chromenes. The present protocol offers advantages in terms of higher yields, wide scope of substrates, operational simplicity, short reaction time, no requirement of workup or column chromatography, and easy access to a wide range of structurally diverse functionalized molecules of biological importance. Recycling of the catalyst and scaling up of the reactions are important attributes of this catalytic process.
An Improved Procedure for the Three-Component Synthesis of Highly Substituted Pyridines Using Ionic Liquid
作者:Brindaban C. Ranu、Ranjan Jana、S. Sowmiah
DOI:10.1021/jo070015g
日期:2007.4.1
A basicionicliquid, [bmIm]OH, efficiently promotes a one-pot, three-component condensation of aldehydes, malononitrile, and thiophenols to produce highly substituted pyridines in high yields at room temperature. This reaction does not involve any hazardous organic solvent and toxic catalyst. The ionicliquid is recovered and recycled for subsequent reactions.
trinitromethanide [1,4-pyrazine-NO2][C(NO2)3]2} as a novel nanostructured molten salt (NMS) catalyzed the synthesis of 2-amino-3,5-dicarbonitrile-6-sulfanylpyridine derivatives via the one-potthree-component condensation reaction between several aromatic aldehyde, malononitrile and benzyl mercaptan at roomtemperature under solvent-free conditions. The synthesized NMS catalyst was fully characterized by
1,4-二硝基吡嗪-1,4-二硝基三甲基甲烷[1,4-吡嗪-NO 2 ] [C(NO 2)3 ] 2 }是一种新型的纳米结构熔融盐(NMS),催化2-氨基-的合成在室温下,无溶剂条件下,几种芳族醛,丙二腈和苄基硫醇之间通过一锅式三组分缩合反应生成3,5-二碳腈-6-磺酰胺基吡啶衍生物。FTIR,1 H NMR,13完全表征了合成的NMS催化剂CNMR,质量,热重,X射线衍射图,扫描电子显微镜和透射电子显微镜分析。所描述方法的主要优点是温和,易于分离,收率高和反应时间短。对于2-氨基-3,5-二碳腈-6-磺酰胺基吡啶合成的最后一步,提出了合理的机理。我们认为,拟议的机制有可能在将来纳入研究生教科书中。