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.
醛,丙二腈和苯硫酚的一锅三组分缩合已通过常规和超声方法实现。该反应已在含水介质中被硼酸催化。通过避免有毒的催化剂和溶剂,该方案以较短的反应时间和高收率在绿色方面提供了相应的2-氨基-3,5-二碳腈-6-硫代吡啶。