Mild preparation of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives with magnetic Fe3O4 nanoparticles coated by (3-aminopropyl)-triethoxysilane as catalyst under ambient and solvent-free conditions
作者:Hamid Reza Shaterian、Majid Mohammadnia
DOI:10.1007/s11164-012-0969-z
日期:2014.1
An efficient, one-pot quantitative procedure for preparation of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives from four-component condensation reaction of hydrazine monohydrate, phthalic anhydride, malononitrile or ethyl cyanoacetate, and aromatic aldehydes in the presence of magnetic Fe3O4 nanoparticles coated by (3-aminopropyl)-triethoxysilane as catalyst under mild, ambient, and solvent-free conditions is described. Simple procedure, high yield, short reaction time, and environmentally benign method are advantages of this protocol. The magnetic Fe3O4 nanoparticles coated by (3-aminopropyl)-triethoxysilane can be recovered and reused several times without loss of activity.
A series of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones were obtained from aldehydes, phthalhydrazide and malononitrile in good to excellent yields at 80–100 °C under solvent-free conditions by proceeding through a simple, mild and efficient procedure utilizing N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide [TBBDA] and poly(N-bromo-N-ethylbenzene-1,3-disulfonamide) [PBBS] as catalysts.
通过从醛,邻苯二甲酰肼和丙二腈在无溶剂条件下,以80–100°C的良好收率,获得一系列1 H-吡唑并[1,2- b ]邻苯并二氮杂5,10-二酮,方法很简单。 ,使用N,N,N ',N'-四溴苯-1,3-二磺酰胺[TBBDA]和聚(N-溴-N-乙基苯-1,3-二磺酰胺)[PBBS]的温和高效方法。