Green one-pot four-component synthesis of 3,5-disubstituted isoxazoles- sulfonates and sulfonamides using a combination of NaDCC as metal-free catalyst and ultrasonic activation in water
作者:Aicha Talha、Hamza Tachallait、Rachid Benhida、Khalid Bougrin
DOI:10.1016/j.tetlet.2021.153366
日期:2021.9
simple and green one-pot reaction has been proposed for the synthesis of novel 3,5-disubstituted isoxazole-sulfonates and -sulfonamides () in water under ultrasound irradiation. The methodology is based on the use of safe and environmentally friendly reagents and allows, 1,3-dipolar cycloaddition, an easy access to functionalized heterocycles with the creation of four new bonds (SO, CN, CO and CC). Comparison
提出了一种简单、绿色的一锅反应,用于在超声波照射下在水中合成新型3,5-二取代异恶唑磺酸盐和异恶唑磺酸盐()。该方法基于使用安全且环保的试剂,并允许通过 1,3-偶极环加成,通过创建四个新键(SO、CN、CO 和 CC)轻松获得官能化杂环。使用经典磁力搅拌和超声波照射的比较研究清楚地表明,超声处理促进清洁转化、高产率 (72–89%) 和更快的反应 (20–28 分钟)。所有合成的化合物均通过 MS-ES、H NMR、C NMR 光谱和 HPLC 分析进行了充分表征。