Tetrahedron letters

Lewis acidic ionic liquids for the synthesis of electrophilic alkenes via the Knoevenagel condensation

JR Harjani, SJ Nara, MM Salunkhe

Index: Harjani, Jitendra R; Nara, Susheel J; Salunkhe, Manikrao M Tetrahedron Letters, 2002 , vol. 43, # 6 p. 1127 - 1130

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Citation Number: 244

Abstract

1-Butyl-3-methylimidazolium chloroaluminate,[bmim] Cl· AlCl3, N= 0.67 and 1- butylpyridinium chloroaluminate,[bpy] Cl· AlCl3, N= 0.67 ionic liquids were found to work well as the Lewis acid catalyst and solvent in the Knoevenagel condensations of benzaldehyde and substituted benzaldehydes with diethyl malonate to give benzylidene malonates. The benzylidene malonates subsequently underwent Michael additions with ...