二氧化硫脲:一锅合成吡喃并[4,3-b] 吡喃类化合物的高效可重复使用有机催化剂（英文）

作     者：Majid Ghashang Syed Sheik Mansoor Krishnamoorthy Aswin Majid Ghashang;Syed Sheik Mansoor;Krishnamoorthy Aswin

作者机构：Faculty of Sciences Najafabad Branch Islamic Azad University Research Department of Chemistry Bioactive Organic Molecule Synthetic Unit C.Abdul Hakeem College 

出 版 物：《催化学报》 (Chinese Journal of Catalysis)

年 卷 期：2014年第35卷第1期

页      面：127-133页

核心收录：

学科分类：081705[工学-工业催化] 0817[工学-化学工程与技术] 08[工学] 0703[理学-化学] 

基　　金：supported by Research Department of Chemistry C.Abdul Hakeem College Melvisharam–632 509 Tamil Nadu India 

主　　题：吡喃衍生物 有机催化剂 一锅法合成 可重复使用 二氧化硫脲 水溶液 反应时间 催化活性 

摘      要：A series of pyrano[4,3‐b]pyran derivatives have been synthesized in excellent yields by the reaction of aromatic aldehydes with malononitrile or cyanoacetate and 4‐hydroxy‐6‐methylpyran‐2‐one in water at 80 °C, with the transformation being catalyzed by an aqueous solution of thiourea dioxide(TUD). Upon completion of the reaction, the product was isolated by filtration or extraction and the remaining aqueous TUD solution could be reused several times without any discernible impact on its catalytic activity. This procedure offers several advantages over existing procedures, including high yields, operational simplicity, the use of a non‐toxic catalyst and solvent, short reaction time and minimum pollution of the environment, making it a useful and attractive process for the preparation of pyrano[4,3‐b]pyran derivatives.