Xanthan sulfuric acid: An efficient and biodegradable solid acid catalyst for the synthesis of bis(indolyl)methanes under solvent-free conditions
作者:Zeba N. Siddiqui、Saima Tarannum
DOI:10.1016/j.crci.2013.04.013
日期:2013.9
Résumé Xanthan sulfuric acid (XSA) is found to be an efficient catalyst for the electrophilic substitution reaction of indole with aromatic aldehydes to afford the corresponding bis(indolyl)methanes at room temperature under solvent-free conditions. The catalyst was characterized for the first time with the help of powder XRD, SEM–EDX and DSC–TGA. The attractive features of this green, new methodology are excellent yield of products, clean reaction profile, reusability of the catalyst, energy sustainable protocol, simple experimental and easier work-up procedures.
研究发现黄原胶硫酸 (XSA) 是吲哚与芳香醛发生亲电取代反应的有效催化剂,可在室温、无溶剂条件下生成相应的双(吲哚基)甲烷。首次借助粉末 XRD、SEM-EDX 和 DSC-TGA 对催化剂进行了表征。这种绿色、新方法的吸引人的特点是优异的产品收率、清洁的反应曲线、催化剂的可重复使用性、能源可持续方案、简单的实验和更容易的后处理程序。