A novel metal-free synthesis of thiazole-substituted α-hydroxy carbonyl compounds and 2-alkenylthiazoles from thiazole N-oxides and olefins
作者:Hui Li、Juan Zhang、Yanqiu Zhang、Jiayi Wang、Gonghua Song
DOI:10.1016/j.tetlet.2019.05.053
日期:2019.12
A metal-free and highly atom-economic synthesis of thiazole-substituted α-hydroxy carbonyl compounds has been developed. Catalyzed by 5 mol% of p-toluenesulfonic acid (TsOH), a variety of thiazole-substituted α-hydroxy carbonyl compounds were obtained in moderate to good yields via 1,3-dipolar cycloaddition of thiazole N-oxides with olefins, followed by a ring-opening reaction. Furthermore, the corresponding
已经开发了无金属且高度原子经济的噻唑取代的α-羟基羰基化合物的合成方法。在5摩尔%的对甲苯磺酸(TsOH)的催化下,通过噻唑N-氧化物与烯烃的1,3-偶极环加成反应,以中等至良好的产率获得了多种噻唑取代的α-羟基羰基化合物。开环反应。此外,可以通过一锅,两步脱水过程从合成的α-羟基羰基化合物以优异的产率生产相应的2-烯基噻唑。