Abstract

A solid acid catalyst bearing sulphamic acid on sawdust (SA@Sawdust) was designed as a novel heterogeneous catalyst. The structure of prepared catalyst was assessed by various spectroscopic techniques such as FT-IR, field emission scanning electron microscopy and energy dispersive X-ray, thermogravimetric analysis, solid-state CP/MAS ¹³C-NMR spectroscopy, and CHNS analysis. The efficiency of prepared catalyst was explored for synthesis of diverse 1,8-dioxo-octahydroxanthene derivatives. The mild reaction conditions are found to be more compatible with a wide range of functional groups. The obtained products could be conveniently separated from the reaction mixture by simple filtration, and the catalyst is recovered and reused for next cycle without significant loss in catalytic efficiency. The alluring features of this synthetic route are operational simplicity, shorter reaction time, high conversion, wide substrate scope, easy work-up procedure, and reusability of catalyst.

Graphic abstract

中文翻译：

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氨基磺酸在官能化木屑上的接枝：一种新型的固体酸催化剂，用于合成1,8-二氧-八氢氧杂蒽

摘要

设计了一种在木屑上带有氨基磺酸的固体酸催化剂（SA @ Sawdust）作为新型多相催化剂。制备的催化剂的结构通过各种光谱技术进行了评估，例如FT-IR，场发射扫描电子显微镜和能量色散X射线，热重分析，固态CP / MAS ¹³C-NMR光谱和CHNS分析。探索了制备的催化剂的效率，以合成各种1,8-二氧-八氢氧杂蒽衍生物。发现温和的反应条件与多种官能团更相容。所获得的产物可以通过简单的过滤方便地从反应混合物中分离出来，并且催化剂被回收并重新用于下一个循环而不会显着降低催化效率。该合成路线的诱人之处在于操作简便，反应时间短，转化率高，底物范围广，后处理步骤容易以及催化剂的可重复使用性。

图形摘要