A facile and efficient synthesis of 5-arylidene 2,4-thiazolidinedione catalyzedby acidic ionic liquid

摘要

An efficient synthesis of 5-arylidine 2,4-thiazolidinediones by the Knoevenagel condensation of aromatic aldehydes with 2,4-thiazolidinedione using 1-benzyl-3-methylimidazolium dihydrogen phosphate (bnmimH2PO4) acidic ionic liquid at 70deg;C. This method gives remarkable advantages such as simple procedure, reactions at mild condition, much faster (50-90 min) reactions, excellent yield of products and the ionic liquid was successfully reused for four cycles without significant loss of activity.