Nickel (II) sulfate hexahydrate is used for the first time as an efficient catalyst for the one-pot synthesis of α-aminophosphonates by three-component condensation reaction of aromatic aldehyde, primary amine, and diethylphosphite under mild and eco-friendly conditions. NiSO4·6H2O was used with a catalytic amount of 5 mol% at room temperature, without solvent in the reaction. A series of the desired α-aminophosphonates are obtained after a simple work-up procedure, with excellent yields (up to 92 %) within a short reaction time of 10–20 min in all cases. This heterogeneous catalyst was reused several times with the same activity. The present approach offers the advantages of a clean reaction, simple methodology, easy purification, and economic availability of the catalyst.
六
水硫酸镍(II)首次作为高效催化剂,在温和环保的条件下,通过芳香醛、
伯胺和
亚磷酸二乙酯的三组分缩合反应一锅合成α-
氨基膦酸盐。 NiSO4·6H2O 在室温下使用,催化量为 5 mol%,反应中无溶剂。经过简单的后处理程序后,即可获得一系列所需的 α-
氨基膦酸酯,在所有情况下,在 10-20 分钟的短反应时间内均具有优异的产率(高达 92%)。该非均相催化剂可重复使用多次,具有相同的活性。本方法具有反应清洁、方法简单、纯化容易、催化剂经济实用等优点。