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Byoung Joon Ahn,Wonghil Chang,Myoung Soo Gang,Keumhee Chae,Yunghee Oh,Jihye Shin 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.3
Lewis acid supported Nanopore Silica catalysts for microwave-assisted Biginelli reaction under solvent-free conditions were prepared by impregnating FeCl₃ dissolved in ethanol to Nanopore Silica at 40℃. Biginelli reaction under solvent-free conditions, one-pot three-component condensation of urea, benzaldehyde, and ethyl acetoacetate, catalyzed with porous material or Lewis acid supported porous material, such as MCM-41, SBA-15, VSB-5, Nanopore Silica, FeCl₃/MCM-41, FeCl₃/Nanopore Silica, CeCl₃/Nanopore Silica and InCl3/Nanopore Silica, was investigated. Our recent results of the microwave-assisted Biginell reaction of some benzaldehyde derivatives starting materials using MCM-41, Nanopore Silica, FeCl₃/Nanopore Silica, under solvent-free conditions are also reported. Aromatic aldehydes carrying either electron releasing or electron withdrawing substituents in the ortho, meta, and para positions afforded good yields of the products using MCM-41 as a catalyst. When Nanopore Silica was used as a catalyst, the yield of the Biginelli product was in the range of 2756%. However FeCl₃/Nanopore Silica has been employed as a catalyst, the yield of the Biginelli product was increased dramatically. Thus it has been found that the use of FeCl₃/Nanopore Silica as heterogeneous catalyst has made this method very cost effective.
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