Recyclable Acid-Base Bifunctional Core-Shell-Shell Nanosphere Catalyzed Synthesis of 5-Aryl-1<i>H</i>
-1,2,3-triazoles through the “One-Pot” Cyclization of Aldehydes, Nitromethane, and Sodium Azide
作者:Lei Liu、Yongjian Ai、Dong Li、Li Qi、Junjie Zhou、Zhike Tang、Zixing Shao、Qionglin Liang、Hong-Bin Sun
DOI:10.1002/cctc.201700401
日期:2017.8.23
collaborative catalyst for the three‐component cyclization of aromatic aldehydes, nitroalkane, and sodium azide to afford 1H‐1,2,3‐triazoles. The bifunctional heterogeneous catalyst showed high activity for this transformation and good chemoselectivity, and toxic HN3 was not released during the course of the reaction. A variety of aldehydes were transformed into the corresponding 5‐aryl‐1H‐1,2,3‐triazoles
磁性可分离的核-壳-壳纳米球Fe 3 O 4 @nSiO 2 -SO 3 H @ MS-NHCOCH 3(n =无孔,MS =微孔SiO 2),被制成为这三种酸的协同碱芳香醛,硝基烷和叠氮化钠的组分环化,得到1 H 1,2,3-三唑。双功能多相催化剂显示出对该转化的高活性和良好的化学选择性,并且在反应过程中没有释放出有毒的HN 3。各种醛被转化为相应的5-芳基-1 H‐1,2,3-三唑的产率高达98%。此外,可以通过使用外部磁场来回收催化剂,并且可以多次重复使用而不会损失活性。相比之下,包含乙酸铵/乙酸的均相催化剂体系也可在此三组分环化中起作用,得到1 H -1,2,3-三唑。