A Rapid and Highly Effectual Protocol for the Synthesis of Bis-coumarins using Triethylaminium-N-sulfonic Acid Tetrachloroaluminate under Solvent-Free Conditions
Journal: Chemical Methodologies (Vol.3, No. 6)Publication Date: 2019-11-01
Authors : Asieh Kargar-Dolatabadi; Abdolkarim Zare;
Page : 591-598
Keywords : Bis-coumarin; 4-Hydroxycoumarin; Protic acidic ionic liquid; Triethylaminium-N-sulfonic acid tetrachloroaluminate (TSAT); Solvent-free;
Abstract
In this work, a rapid and highly effectual protocol for the synthesis of bis-coumarins has been developed. The one-pot quasi three-component reaction of aromatic aldehydes (1 eq.) with 4-hydroxycoumarin (2 eq.) in the presence of catalytic amount of protic acidic ionic liquid triethylaminium-N-sulfonic acid tetrachloroaluminate (TSAT) under solvent-free conditions afforded the mentioned compounds in high yields and short reaction times.
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