A series of azo-linked 4H-benzo[d][1,3]oxazine-2,4-diones were synthesized in excellent yields and short reaction time by one-pot reaction between various synthetized azo-linked carboxylic acids and carbon dioxide in the presence of [email protected]/MCM-41 nanocomposite as a novel catalyst at room temperature. This nanocomposite consists of CuO nanoparticles and MCM-41 matrix obtained from rice husk ash (RHA). The present methodology offers several advantages such as mild conditions, excellent yields, simple procedure and reduced environmental consequences. The catalyst was recovered and reused. The structures of the synthesized 4H-benzo[d][1,3]oxazine-2,4-dione compounds were confirmed by ¹H, ¹³C NMR and FTIR spectral data and elemental analyses.

通过各种偶氮联结羧酸与二氧化碳的一锅反应，合成了一系列偶氮联结的4H-苯并[d] [1,3]恶嗪-2,4-二酮，收率高，反应时间短。 [电子邮件保护] / MCM-41纳米复合材料在室温下作为新型催化剂的存在。这种纳米复合材料由CuO纳米颗粒和从稻壳灰（RHA）获得的MCM-41基质组成。本方法提供了许多优点，例如温和的条件，优异的收率，简单的方法和减少的环境影响。回收催化剂并重新使用。合成的4H-苯并[d] [1,3]恶嗪-2,4-二酮化合物的结构通过¹ H，¹³ C NMR和FTIR光谱数据以及元素分析确定。