作者:Su-Dong Cho、Sang-Yong Song、Yong-Dae Park、Jeum-Jong Kim、Woo-Hong Joo、Motoo Shiro、J.R. Falck、Dong-Soo Shin、Yong-Jin Yoon
DOI:10.1016/j.tetlet.2003.09.216
日期:2003.12.8
A novel and effective synthesis of pyridazino[4,5-b][1,4]oxazin-3,8-diones via Smiles rearrangement is presented. Treatment of N-substituted 2-chloro(or hydroxy)acetamide, 2-tetrahydropyranyl-4-chloro-5-hydroxy(or chloro)pyridazin-3-one and cesium carbonate in refluxing acetonitrile was afforded the corresponding pyridazino[4,5-b][1,4]oxazin-3,8-diones in excellent yield.
提出了一种通过Smiles重排合成新颖有效的哒嗪并[4,5- b ] [1,4]恶嗪-3,8-二酮的方法。在回流的乙腈中处理N-取代的2-氯(或羟基)乙酰胺,2-四氢吡喃基-4-氯-5-羟基(或氯)哒嗪-3-酮和碳酸铯,得到相应的哒嗪[4,5-]。b ] [1,4]恶嗪-3,8-二酮,收率高。