Rapid, efficient and solvent-free synthesis of (un)symmetrical xanthenes catalyzed by recyclable sulfated polyborate
作者:Manisha S. Patil、Amey V. Palav、Chetan K. Khatri、Ganesh U. Chaturbhuj
DOI:10.1016/j.tetlet.2017.06.027
日期:2017.7
straightforward approach to the synthesis of 1,8-dioxo-octahydroxanthenes, 14-phenyl-14H-dibenzo[a,j]xanthene and tetrahydrobenzoxanthene-11-ones under solvent-free conditions using sulfated polyborate as a highly efficient catalyst. The procedure offers several advantages including cleaner reaction profile, mild reaction condition, economic, recyclable and environmentally benign catalyst, high yields, simple
本研究描述了一种在无溶剂条件下使用硫酸盐快速合成1,8-二氧-八氢氧杂蒽,14-苯基-14 H-二苯并[ a,j ]氧杂蒽和四氢苯并氧杂蒽-11的快速,简单和直接的方法。多硼酸盐作为高效催化剂。该方法具有几个优点,包括更清洁的反应曲线,温和的反应条件,经济,可循环使用和对环境无害的催化剂,高收率,简单的实验和后处理程序。尽管非萃取性后处理/纯化以及催化剂的可重复使用性使该方法在经济上可大规模使用。