Ceric Ammonium Sulfate (CAS) Mediated Oxidations of Benzophenones Possessing a Phenolic Substituent for the Synthesis of Xanthones and Related Products,The Journal of Organic Chemistry

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Ceric Ammonium Sulfate (CAS) Mediated Oxidations of Benzophenones Possessing a Phenolic Substituent for the Synthesis of Xanthones and Related Products
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2018-12-05 00:00:00 , DOI: 10.1021/acs.joc.8b02503
Jean Dam ₁ , Moira L. Bode ₁ , Charles B. de Koning ₁

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Work previously published by our group described novel methodology for the synthesis of xanthones and related products from phenolic benzophenones in a reaction mediated by ceric ammonium sulfate (CAS). In this paper we further explore this novel reaction by subjecting an additional set of phenolic benzophenones to CAS to afford a range of compounds, including xanthones, 9H-xanthen-2,9(4aH)-diones, 3H-spiro[benzofuran-2,1′-cyclohexa[2,5]diene]-3,4′-diones, and biaryl compounds. A comparison of these reactions with the more commonly used oxidant ceric ammonium nitrate (CAN) was also conducted. Based on these results, greater insight into the reaction mechanism has been gained. In addition, the conversion of the synthesized xanthen-2,9(4aH)-diones to xanthones by treatment with sodium dithionite is described.

中文翻译：

硫酸铈铵（CAS）介导的苯甲酮的氧化，该苯甲酮具有酚类取代基，用于合成氧杂蒽酮和相关产品

我们小组先前发表的工作描述了在硫酸铈铵（CAS）介导的反应中，从酚类二苯甲酮合成氧杂蒽酮和相关产物的新方法。在本文中，我们通过对另一组酚二苯甲酮进行CAS反应，以提供一系列化合物，包括x吨，9 H -xanthen-2,9（4a H）-二酮，3 H-螺[苯并呋喃]，来进一步探索这一新颖的反应。-2,1'-环己[2,5]二烯] -3,4'-二酮和联芳基化合物。还对这些反应与更常用的氧化剂硝酸硝酸铈铵（CAN）进行了比较。基于这些结果，已经获得了对反应机理的更深入的了解。另外，合成的黄嘌呤-2,9（4a H描述了通过用连二亚硫酸钠处理生成二氧杂蒽的-二酮。

更新日期：2018-12-05

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