DBU-catalyzed three-component one-pot synthesis of highly functionalized pyridines in aqueous ethanol
作者:Ritu Mamgain、Ram Singh、Diwan S. Rawat
DOI:10.1002/jhet.32
日期:2009.1
1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) efficiently catalyzes three-componentone-pot condensations of aldehyde, malononitrile, and thiophenol to produce highlyfunctionalized pyridines in excellent yield in aqueous ethanol. J. Heterocyclic Chem., 46, 69 (2009).
Boric acid catalyzed convenient synthesis of 2-amino-3,5-dicarbonitrile-6-thio-pyridines in aqueous media
作者:Pravin V. Shinde、Swapnil S. Sonar、Bapurao B. Shingate、Murlidhar S. Shingare
DOI:10.1016/j.tetlet.2009.12.146
日期:2010.3
A one-pot three-component condensation of an aldehyde, malononitrile, and thiophenol has been achieved by conventional and ultrasound method. The reaction has been catalyzed by boric acid in aqueous medium. This protocol afforded corresponding 2-amino-3,5-dicarbonitrile-6-thio-pyridines in shorter reaction times and high yields with the green aspects by avoiding toxic catalysts and solvents.
K2CO3 catalyzed green and rapid access to 2-amino-3,5-dicarbonitrile-6-thio-pyridines
作者:Mazaahir Kidwai、Ritika Chauhan
DOI:10.1007/s13738-013-0368-4
日期:2014.8
A series of 2-amino-3,5-dicarbonitrile-6-thio-pyridine derivatives have been synthesized by a simple method via a one-pot, three-component condensation reaction of aromatic aldehydes and malononitrile with substituted thiophenols using potassium carbonate as a green base in polyethylene glycol (PEG-400) as a reusable solvent. This protocol proved to be efficient and environmentally benign in terms of high yields, short reaction times, mild conditions, and reusability of the reaction medium. .