A simple Green approach to the synthesis of 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromene-3-carbonitrile derivatives catalyzed by 3-hydroxypropanaminium acetate (HPAA) as a new ionic liquid
作者:H. R. Shaterian、A. R. Oveisi
DOI:10.1007/bf03249089
日期:2011.6
A new ionic liquid, 3-hydroxypropanaminium acetate (HPAA) [H3N+-CH2-CH2-CH2-OH][CH3COO-], was synthesized for the first time and used as an efficient and recoverable catalyst in the synthesis of 2-amino-5-oxo-4,5-dihydropyrano[3,2-c]chromene-3-carbonitrile derivatives by condensing together 4-hydroxycoumarin, aldehydes and malononitrile at room temperature. The catalyst can be reused for four times without noticeable loss of activity.
Task-Specific Ionic Liquid as the Recyclable Catalyst for the Rapid and Green Synthesis of Dihydropyrano[3,2-c]chromene Derivatives
作者:Hamid Reza Shaterian、Moones Honarmand
DOI:10.1080/00397911.2010.519594
日期:2011.12.1
A task-specific ionic liquid, [H3N+-CH2-CH2-OH][CH3COO-], was successfully applied as an efficient and reusable catalyst for the one-pot domino to approach to dihydropyrano[3,2-c] chromene derivatives with atom economy in a condensation reaction of 4-hydroxycoumarin, aldehydes, and malononitrile in a combinatorial fashion. The reaction gave excellent yields within short reaction times at room temperature under solvent-free grinding conditions. The products and ionic liquid could be conveniently separated from the reaction mixture, indicating that the whole process was performed as a green chemical transformation.