Phosphomolybdicacid (PMA)–SiO2 was found to be an efficient catalyst for the three‐component condensation reaction of phthalhydrazide, 1,3‐diketone, and aldehydes to produce 2H‐indazolo[1,2‐b]phthalazine‐triones in excellent yields. The catalyst can be recovered and reused without significant loss of activity.
磷钼酸(PMA)-SiO 2被发现是邻苯二甲酰肼,1,3-二酮和醛的三组分缩合反应产生2 H-吲唑并[1,2 - b ]邻苯二甲腈-三酮的有效催化剂。优异的产量。催化剂可被回收和再利用而没有明显的活性损失。
Experimental and theoretical study on one-pot, three-component route to 2H-indazolo[2,1-b]phthalazine-triones catalyzed by nano-alumina sulforic acid
Abstract A simple, efficient, and high yielding one-pot protocol for the synthesis of 2H-indazolo[2,1-b]phthalazine-trione derivatives has been developed by three-component coupling of phthalhydrazide, dimedone and some aromatic aldehydes in ecofriendly neat conditions promoted by nano-γ-alumina sulforic acid. This protocol avoids the use of expensive catalysts, toxic solvents and chromatographic separation
摘要 通过邻苯二甲酰肼、二甲酮和一些芳香醛的三组分偶联,在生态友好的纯净环境中,开发了一种简单、高效、高产的一锅法合成 2H-吲唑并 [2,1-b] 酞嗪三酮衍生物。纳米γ-氧化铝硫酸促进的条件。该协议避免使用昂贵的催化剂、有毒溶剂和色谱分离。此外,拟议的协议扩展到线性 β-二酮(乙酰丙酮)而不是环状二酮(二甲酮)。证明了这种收敛且环境友好的方法的通用性和功能耐受性。该缩合反应的建议机制的每个步骤的性质也可以通过使用 B3LYP/6-31G ** 理论水平的密度泛函理论 (DFT) 计算来确定。结果表明,第一步是电荷控制;而第二个由前沿分子轨道控制。还计算了 1 H 和 13 C 化学位移值以及标题化合物的结构参数,并将缩放值与相应的实验 NMR 和 X 射线光谱进行了比较。因此,计算的光谱数据和优化的几何形状与实验结果非常吻合。