一种环境友好且高效的方法,用于通过廉价的铜催化、低毒且稳定的 PIFA 氧化合成具有潜在轴向手性的不对称二喹喔啉-2(1 H )-酮,很少需要 PhSeSePh 的辅助,喹喔啉-2 的区域选择性自偶联(1 H )-在温和条件下形成。该方案与多种官能团兼容,可从易得、安全的起始原料制备功能化不对称二聚喹喔啉-2(1H ) -酮,为喹喔啉-2方法学研究的可持续发展提供了新思路。 (1 H )-1。
protocol for the synthesis of thetetrazolo[1,5‐a]quinoxalin‐4(5H)‐ones via copper‐catalyzed [3+2] cyclization of azidotrimethylsilane with quinoxalin‐2(1H)‐ones under mild conditions has been disclosed. This practical protocol is compatible with a variety of functional groups and provides an access to functionalized tetrazolo[1,5‐a]quinoxalin‐4(5H)‐ones from readily available and safe starting materials
一种方便有效的方案,在温和的条件下,用喹喔啉-2(1 H)-1通过铜催化的叠氮三甲基硅烷的[ 3 + 2]环化反应合成四唑并[1,5 - a ]喹喔啉-4(5 H)-1。条件已经公开。该实用协议与各种官能团兼容,并提供了从容易获得的安全起始原料中获得功能化四唑[1,5 - a ]喹喔啉-4(5 H)-的方法。
Copper-Catalyzed Divergent C–H Functionalization Reaction of Quinoxalin-2(1<i>H</i>)-ones and Alkynes Controlled by N1-Substituents for the Synthesis of (<i>Z</i>)-Enaminones and Furo[2,3-<i>b</i>]quinoxalines
With control by N1-substituents, the switchable divergent C–H functionalization reaction of quinoxalin-2(1H)-ones is achieved for the synthesis of (Z)-enaminones and furo[2,3-b]quinoxalines using the combination of a copper catalyst and an oxidant. This new protocol features mild reaction conditions, readily available materials, and a broad substrate scope. Gram-scale and mechanistic studies were also
Metal & Surfactant-Free oxidation of Quinoxalin-2(1H)-ones: Access to Quinoxaline-2,3-diones
作者:Xuan Li、Jiawang Zang、Shoucai Wang、Chen Kang、Jiawei Xu、Guangbin Jiang、Fanghua Ji
DOI:10.1016/j.tetlet.2022.153916
日期:2022.7
practical method features transition metal free, surfactant free, chromatography free, mild reaction conditions, good functional group tolerance and easy scale-up synthesis. Furthermore, it provided a convenient approach for the synthesis of one kind of known inhibitor for α-glucosidase. This mechanistic study shows that this transformation is not a radical process.