Xanthan Sulfuric Acid: An Efficient Bio-supported and Recyclable Solid Acid Catalyst for the Synthesis of 2-Aryl Thiadiazolo Benzimidazoles
作者:B. Suresh Kuarm、B. Janardan、Peter A. Crooks、B. Rajitha
DOI:10.1002/cjoc.201100137
日期:2012.4
Xanthansulfuricacid is an efficientsolidacidcatalyst for the preparation of 2‐aryl benzimidazoles in excellent yields. This method is applicable for the reaction of benzo[c][1,2,5]thiadiazole‐4,5‐diamine with aldehydes by simple physical grinding at room temperature. The salient features of the present methodology is cheaper process, easy synthesis of stable catalyst and the catalyst can be easily
黄原酸硫酸是一种高效的固体酸催化剂,以优异的收率制备2-芳基苯并咪唑。通过在室温下简单物理研磨,该方法适用于苯并[ c ] [1,2,5]噻二唑-4,5-二胺与醛的反应。本方法的显着特征是便宜的方法,容易合成稳定的催化剂,并且该催化剂可以容易地再循环而没有显着的活性损失。
Cellulose Sulfuric Acid: Novel and Efficient Biodegradable and Recyclable Acid Catalyst for the Solid-State Synthesis of Thiadiazolo Benzimidazoles
Abstract An efficient method for the synthesis of 2-substituted benzimidazoles has been developed. In this method, benzo[c][1,2,5]thiadiazole-4,5-diamine was condensed with different aldehydes in the presence of cellulose sulfuric acid under solvent-free conditions by simple physical grinding of reactants using a mortar and pestle at room temperature. The methodology is mild, high-yielding, and green