Nano crystalline ZnO catalyzed one pot multicomponent reaction for an easy access of fully decorated 4H-pyran scaffolds and its rearrangement to 2-pyridone nucleus in aqueous media
摘要:
A green and highly efficient protocol has been developed for the synthesis of 4H-pyran scaffolds installing a one-pot three-component coupling reaction of an aldehyde, malononitrile, and a 1,3-diketo compound using nano structured ZnO as the catalyst in aqueous alcoholic medium. A greener method to synthesize 3,4-dihydropyridin-2-one has also been developed by rearranging 4H-pyran derivatives in aqueous medium applying p-TSOH as the right catalyst source. A wide spectrum of functional groups was tolerated in both the developed synthetic protocols with good to excellent yield of the targeted molecules. (c) 2012 Elsevier Ltd. All rights reserved.
Tetramethylguanidine-[bmim][BF4]. An Efficient and Recyclable Catalytic System for One-Pot Synthesis of 4H-Pyrans
作者:Yanqing Peng、Gonghua Song、Feifei Huang
DOI:10.1007/s00706-004-0270-y
日期:2005.5
A clean and efficient method for the synthesis of 4 H -pyran derivatives through the one-pot condensation of aromatic aldehydes, malononitriles, and β-dicarbonyl compounds, using guanidine base tetramethylguanidine in [ bmim ][BF4] ionic liquid as a recyclable catalytic system, was described.
A simple and convenient approach to the Friedländer synthesis of pyrano[2,3-b]pyridines
作者:Nagarajan Panneer Selvam、Thelagathoti Hari Babu、Paramasivan T. Perumal
DOI:10.1016/j.tet.2009.08.025
日期:2009.10
SnCl2·2H2O mediated efficient synthesis of pyrano[2,3-b]pyridines was achieved by the Friedländer reaction of 2-amino-3-cyano-4H-pyrans with cyclopentanone/cyclohexanone under solvent-free condition.
在无溶剂条件下,通过2-氨基-3-氰基-4 H-吡喃与环戊酮/环己酮的Friedländer反应,实现了SnCl 2 ·2H 2 O介导的吡喃并[2,3- b ]吡啶的高效合成。
Efficient Three-Component One-Pot Synthesis of 4H-Pyrans
作者:J. Malviya、S. Kala、L. K. Sharma、R. K. P. Singh
DOI:10.1134/s1070428019050178
日期:2019.5
Clean, practical, and efficient electrochemical synthesis of pharmaceutically relevant 4H-pyran derivatives by one-pot three-component combination of an aryl aldehyde, malononitrile, and a dicarbonyl compoundis developed. The synthesis is performed in ethanol with lithium perchlorate as a supporting electrolyte in an undivided cell on a platinum electrode under constant potential electrolysis conditions.