Efficient and convenient synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives mediated by L-proline
作者:Harendra Nath Roy、Masud Rana、Abu Zafar Al Munsur、Kee-In Lee、Ashis K. Sarker
DOI:10.1080/00397911.2016.1192650
日期:2016.8.17
ABSTRACT An efficient, four-component, one-pot condensation reaction of phthalimide or phthalic anhydride, aromatic aldehydes, and ethyl cyanoacetate for the synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives mediated by L-proline in excellent yields is reported. GRAPHICAL ABSTRACT
摘要 邻苯二甲酰亚胺或邻苯二甲酸酐、芳香醛和氰乙酸乙酯的高效、四组分、一锅缩合反应,用于合成由 L 介导的 1H-吡唑并[1,2-b]酞嗪-5,10-二酮衍生物-脯氨酸的产率很高。图形概要
Experimental and DFT mechanistic insights into one-pot synthesis of 1<i>H</i>-pyrazolo[1,2-<i>b</i>]phthalazine-5,10-diones under catalysis of DBU-based ionic liquids
Benzylation of DBU followed by anion exchange of the resulting salt with trifluoroacetate gave nearly quantitatively the ionic liquid [Bn-DBU][TFA]. It is shown here to be an efficient catalyst for the synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones via the three-component reaction of phthalhydrazide, aromatic aldehydes, and active α-methylene nitriles. DFT calculations at the B3LYP/SVP level and the
DBU的苯甲酰化,然后将所得盐与三氟乙酸根阴离子交换,几乎定量地得到了离子液体[Bn-DBU] [TFA]。在此显示出对于1合成的有效催化剂ħ -吡唑并[1,2- b ]酞嗪-5,10-二酮通过邻苯二甲酰肼,芳族醛和活性α-亚甲基腈的三组分反应。在B3LYP / SVP级别的DFT计算和实验结果与该反应的三步机理一致。基于DFT计算,催化效果很大程度上来自离子液体的固有离子性质,而不是其作为简单碱的作用。这些计算还预测了两种近能量活化的络合物的存在,它们的速率决定作用和能量取决于它们与离子液体中阴离子组分的相互作用,因为[Bn-DBU] [TFA]的催化活性高于[Bn-DBU] [OAc]。这种机理学方法为合成1 H的离子液体催化剂的合理设计开辟了新的和有希望的见解。-吡唑并[1,2 - b ]酞嗪-5,10-二酮。这里介绍的合成方法具有几个突出的优点。
An Improved Procedure for the Three-Component Synthesis of 1<i>H</i>-Pyrazolo[1,2-B]Phthalazine-5,10-Dione Derivatives Using Basic Ionic Liquid
An efficient and green method for the synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dionederivatives has been achieved through the one-pot, three-component condensation of aromatic aldehydes, malononitrile or ethyl cyanoacetate, and phthalhydrazide in the presence of 1-butyl-3-methyl imidazolium hydroxide ([bmim]OH) as catalyst in EtOH. This reaction does not involve any hazardous organic solvent
A highly efficient green synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives and their photophysical studies
作者:Dushyant Singh Raghuvanshi、Krishna Nand Singh
DOI:10.1016/j.tetlet.2011.08.111
日期:2011.10
for an efficientsynthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones by one-pot cyclocondensation reaction of phthalhydrazide, aromatic aldehydes, and malononitrile or ethyl cyanoacetate under microwave irradiation. The advantages of this method include the use of green catalyst, no organic solvent, easy work-up and excellent yields. The photophysical properties for some 1H-pyrazolo[1,2-b]phthalazine-5
特定任务的离子型液体,[BMIM] OH,已被用于为1的有效合成ħ -吡唑并[1,2- b ]酞嗪-5,10-二酮通过邻苯二甲酰的一锅反应环化缩合,芳族醛,微波辐射下的丙二腈或氰基乙酸乙酯。该方法的优点包括使用绿色催化剂,不使用有机溶剂,易于后处理和优异的收率。首次研究了一些1 H-吡唑并[1,2 - b ]酞嗪-5,10-二酮衍生物的光物理性质。
Ultrasound-assisted one-pot, three-component synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones
Triethylamine was found to be an efficientcatalyst for the synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones by one-pot reaction of phthalhydrazide, aromatic aldehydes, and malononitrile or ethyl cyanoacetate in ethanol under ultrasonic irradiation. The advantages of this method are the use of an inexpensive and readily available catalyst, easy workup, improved yields, and the use of ethanol