Magnetic calcined oyster shell functionalized with taurine immobilized on β-cyclodextrin (Fe3O4/COS@β-CD-SO3H NPs) as green and magnetically reusable nanocatalyst for efficient and rapid synthesis of spirooxindoles
作者:Narges Mohammadian、Batool Akhlaghinia
DOI:10.1007/s11164-019-03860-x
日期:2019.10
16–25 nm. The new magnetic nanocatalyst (Fe3O4/COS@β-CD-SO3H NPs) was found to be very effective in one-pot multi-component reaction of isatin, active methylene component, and 1,3-dicarbonyl compounds for rapid preparation of spirooxindoles with fused chromenes in water in excellent yield. The most promising features of the presented approach are the short reaction time (15–22 min), magnetic separation of
摘要 固定在β环糊精牛磺酸官能磁性煅牡蛎壳(FE 3 ö 4 / COS @β-CD-SO 3H NPs是作为一种新的稳定,长寿命,高效和优异的可重复使用的磁性纳米结构催化剂制备的。所制备的固体酸性催化剂通过各种光谱和显微技术进行表征,例如傅立叶变换红外(FT-IR)光谱,X射线衍射(XRD)分析,扫描电子显微镜(SEM),能量色散X射线(EDX)光谱,透射电子显微镜(TEM),振动样品磁力法(VSM),热重分析(TGA)/差热重分析(DTG)和元素(CHNS)分析。结果清楚地表明,合成的超顺磁性催化剂以均匀的球形存在,平均粒径为16-25 nm。新的磁性纳米催化剂(FE 3 ö 4 / COS @β-CD-SO 3已发现H NPs在伊斯兰法,活性亚甲基组分和1,3-二羰基化合物的一锅多组分反应中非常有效,可在水中以优异的产率快速制备带有稠合色烯的螺硫醇。提出的方法最有希望的特点是反应时间