An efficient and recyclable bifunctional acid–base ionic liquid for synthesis of 1H-indazolo[1,2-b]phthalazinetriones
作者:Davood Habibi、Atefeh Shamsian
DOI:10.1007/s11164-014-1736-0
日期:2015.9
A bifunctional ionic liquid, 1,4-dimethyl(4-sulfobutyl)piperazinium hydrogen sulfate ([DMSBP][HSO4], 1), containing both acid and basic sites was prepared. This ionic liquid was used as a homogeneous and reusable catalyst and efficiently promoted synthesis of 1H-indazolo[1,2-b]phthalazinetriones (5a–m) in a one-pot, four-component condensation reaction of phthalic anhydride, hydrazinium hydroxide, dimedone, and aromatic aldehydes under solvent-free conditions at 80 °C. Advantages of the method include short reaction time, high yields, and simple purification.
制备了一种含有酸性和碱性位点的双功能离子液体1,4-二甲基(4-磺丁基)哌嗪硫酸氢盐([DMSBP][HSO4], 1)。该离子液体作为均相可重复使用的催化剂,在无溶剂条件下,于80°C下高效促进了邻苯二甲酸酐、水合肼、二甲基乙二肟和芳香醛的四组分一锅法缩合反应,合成了1H-吲唑并[1,2-b]酞嗪三酮类化合物(5a-m)。该方法的优点包括反应时间短、产率高和纯化简单。