AN ECO-FRIENDLY ONE-POT SYNTHESIS OF 4,4'-(ARYLMETHYLENE)BIS(1H-PYRAZOL-5-OLS) USING [Et3NH][HSO4] AS A RECYCLABLE CATALYST
作者:ZHONGQIANG ZHOU、YULIANG ZHANG
DOI:10.4067/s0717-97072015000300003
日期:——
work-up and eco-friendly reaction conditions. Keywords : 4,4′-(Arylmethylene)bis(1H-pyrazol-5-ols); [Et 3 NH][HSO 4 ]; Solvent-free; Multicomponent reaction INTRODUCTION 4,4′-(Arylmethylene)bis(1H-pyrazol-5-ols) are applied as fungicides 1 , pesticides 2 and dyestuffs 3 . The condensation of aldehydes with two equivalents of 3-methyl-1-phenyl-5- pyrazolone is a conventional chemical approach to 4,4′-
Chickpea leaf exudates: a green Brønsted acid type biosurfactant for bis(indole)methane and bis(pyrazolyl)methane synthesis
作者:Rupesh C. Patil、Shashikant A. Damate、Dnyandev N. Zambare、Suresh S. Patil
DOI:10.1039/d1nj00382h
日期:——
A clean and highly efficient protocol for green synthesis of bis(indole)methanes and bis(pyrazolyl)methanes has been successfully achieved by using a naturally sourced bio-surfactant, chickpea leaf exudates (CLE), as a Brønsted acid-type catalyst. The reaction proceeds smoothly with CLE in alcoholic medium at 60 °C in a very short reaction time, and therefore it is a green, environmentally sound alternative
Pyrazolone was prepared through the reaction of ethyl acetoacetate and hydrazine hydrate in EtOH at room temperature. Then, bispyrazole derivatives, as attractive biologically active compounds, were synthesized by reacting two equivalents of prepared pyrazolone and one equivalent of aldehyde in the presence of SBA-Pr-SO3H under solvent-free condition at 120 °C. The reaction time was short (3–6 min), while
在室温下,通过乙酰乙酸乙酯与水合肼在EtOH中的反应制备吡唑啉酮。然后,在SBA-Pr-SO 3存在下,使两当量的吡唑啉酮和一当量的醛反应,合成了作为有吸引力的生物活性化合物的双吡唑衍生物。H在无溶剂条件下于120°C加热。反应时间短(3–6分钟),而产物的收率高(85–97%)。使用Discovery Studio 2.5(Accelrys Inc,美国加利福尼亚州圣地亚哥)将化合物与蛋白质对接。分子对接(GOLD方法)研究表明,吡唑与RET激酶有效结合。接下来,通过圆盘扩散法测试了联吡唑对某些革兰氏阳性和革兰氏阴性细菌的生物学活性以及抗真菌活性。所有化合物均未显示出明显的抗菌活性,但其中两种化合物显示出对白色念珠菌的良好活性。 图形概要
Aspirin: an efficient catalyst for synthesis of bis (pyrazol-5-ols), dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles in an environmentally benign manner
of biologically active compounds including pyrazol core using aspirin as a novel and green catalyst. The synthesis of bis(pyrazol-5-ol) derivatives was developed via one-pot, pseudo-five-component condensation, and the target dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles were prepared by one-pot, four-component reaction. These reactions can be performed in tandem from readily available starting
Glycerol assisted eco-friendly strategy for the facile synthesis of 4,4′-(arylmethylene)bis(3-methyl-1H-pyrazol-5-ols) and 2-aryl-2,3-dihydroquinazolin-4(1H)-ones under catalyst-free conditions
Abstract This article describes glycerol mediated eco-friendlyapproaches for the convenient access of structurally diverse 4,4′-(arylmethylene)bis(3-methyl-1 H -pyrazol-5-ol) and 2-aryl-2,3-dihydroquinazolin-4(1 H )-one motifs under catalyst-free conditions. Prominent advantages include clean processes, atom-efficiency, simplicity of the work-up, neutral conditions, low-cost reaction medium, excellent
摘要 本文介绍了甘油介导的生态友好方法,可方便地访问结构多样的4,4'-(芳基亚甲基)双(3-甲基-1 H- 吡唑-5-醇)和2-芳基-2,3-二氢喹唑啉在无催化剂的条件下-4(1 H )-one主题。突出的优势包括清洁工艺,原子效率,后处理的简便性,中性条件,低成本的反应介质,优异的产品收率和溶剂可重复使用性,以及相对较短的反应时间。 图形概要