在5-氨基-3-甲基-1-苯基吡唑(1)与醛(2)反应中合成一系列双吡唑并[3,4- b:4',3'- e ]吡啶(3))描述了在微波辐射和无溶剂条件下)。产品的结构阐明基于对1 H-COSY,NOESY,DEPT,HSQC和HMBC等实验的详细nmr分析。这些化合物在体外对皮肤真菌具有中等程度的抗真菌活性。
A mild and efficient method for the synthesis of bispyrazolo[3,4-b:4′,3′-e]pyridines from 5-aminopyrazoles and aromatic aldehydes using an inexpensive FeCl3 catalyst is reported. The reaction temperature was reduced from 220–250 °C to 130 °C compared to conventional methods. A large proportion of the products precipitated directly from the mixture at room temperature. Aliphatic and α,β-unsaturated
报道了使用廉价的FeCl 3催化剂从5-氨基吡唑和芳族醛合成双吡唑并[3,4- b:4',3'- e ]吡啶的温和而有效的方法。与传统方法相比,反应温度从220–250°C降至130°C。在室温下,很大一部分产物直接从混合物中沉淀出来。脂肪族和α,β-不饱和醛选择性地导致形成相应的1 H-吡唑并[3,4- b ]吡啶衍生物。还提出了可能的多米诺反应机制。经由Sonogashira偶联反应将几个芳基炔基引入这些三环分子。
Ionic Liquid as an Efficient Promoting Medium for Synthesis of Bis-Pyrazolo[3,4-b:4′,3′-e]Pyridines
作者:Da-Qing Shi、Fang Yang
DOI:10.1002/jccs.200800113
日期:2008.8
The preparation of a series of bis-pyrazolo[3,4-b:4′,3′-e]pyridines by the reaction of 5-aminopyrazole with aldehydes in ionicliquid [bmim]Br is described. This new method has the advantages of easier work-up, milder reaction conditions, high yields and environmental friendliness compared with other methods.
The synthesis of a series of bis-pyrazolo[3,4-b:4′,3′-e]pyridines (3) in the reaction of 5-amino-3-methyl-1-phenylpyrazole (1) with aldehydes (2) under microwave irradiation and solvent-free conditions is described. The structure elucidation of the products is based on detailed nmr analysis of experiments such as 1H-COSY, NOESY, DEPT, HSQC and HMBC. These compounds showed moderate antifungal in vitro
在5-氨基-3-甲基-1-苯基吡唑(1)与醛(2)反应中合成一系列双吡唑并[3,4- b:4',3'- e ]吡啶(3))描述了在微波辐射和无溶剂条件下)。产品的结构阐明基于对1 H-COSY,NOESY,DEPT,HSQC和HMBC等实验的详细nmr分析。这些化合物在体外对皮肤真菌具有中等程度的抗真菌活性。
AN IMPROVED GENERAL METHOD FOR THE PREPARATION OF 4-ARYL SUBSTITUTED<i>bis</i>PYRAZOLO[3,4-b;4,3'-e]PYRIDINES
Electrochemically Enabled Cascade Cyclization Reaction of Aromatic Aldehydes and Pyrazol-5-amines: Synthesis of Bis-pyrazolo[3,4-<i>b</i>:4′,3′-<i>e</i>]pyridines
作者:Peng Qian、Shan Jiang、Hua Fan、Siqi Jiang、Longlong Xu、Jiaojiao Liu
DOI:10.1021/acs.joc.2c00988
日期:2022.7.15
A facile method for the synthesis of bis-pyrazolo[3,4-b:4′,3′-e]pyridines from easily available aromatic aldehydes and pyrazol-5-amines was developed via electrochemistry. The reaction proceeded smoothly under metal and external chemical oxidant-free conditions, giving a variety of bis-pyrazolo[3,4-b:4′,3′-e]pyridines in moderate yields.
通过电化学开发了一种从易得的芳香醛和 pyrazol-5- amines合成双吡唑并[3,4- b :4',3' -e ] 吡啶的简便方法。该反应在无金属和外部化学氧化剂的条件下顺利进行,以中等收率得到多种双吡唑并[3,4- b :4',3' -e ]吡啶。