One-Pot, Three-Component Synthesis of 1-(2-Hydroxyethyl)-1<i>H</i>-1,2,3-triazole Derivatives by Copper-Catalyzed 1,3-Dipolar Cycloaddition of 2-Azido Alcohols and Terminal Alkynes under Mild Conditions in Water
A safe, efficient, and improved procedure for the regioselective synthesis of 1‐(2‐hydroxyethyl)‐1H‐1,2,3‐triazole derivatives under ambient conditions is described. Terminalalkynes reacted with oxiranes and NaN3 in the presence of a copper(I) catalyst, which is prepared by in situ reduction of the copper(II) complex 4 with ascorbic acid, in H2O. The regioselective reactions exclusively gave the corresponding
描述了一种在环境条件下区域选择性合成1-(2-羟乙基)-1 H -1,2,3-三唑衍生物的安全,有效和改进的方法。末端炔烃在铜(I)催化剂存在下与环氧乙烷和NaN 3反应,该催化剂是通过在H 2 O中用抗坏血酸原位还原铜(II)配合物4而制得的。区域选择性反应只得到相应的1,4-二取代的1 H -1,2,3-三唑的收率好至极好。该程序避免了有机叠氮化物在原位产生的处理,从而使本已强大的点击过程更加人性化和安全。该方案的显着特征是高收率,非常短的反应时间,在环境友好的溶剂(H 2 O)中更干净的反应曲线,直接性以及使用无毒催化剂。此外,可以通过简单过滤反应混合物来回收和再循环催化剂,并在不显着降低催化活性的情况下重复使用十次。连续的催化反应后未观察到金属络合物的浸出。
Immobilization of Porphyrinatocopper Nanoparticles onto Activated Multi-Walled Carbon Nanotubes and a Study of its Catalytic Activity as an Efficient Heterogeneous Catalyst for a Click Approach to the Three-Component Synthesis of 1,2,3-Triazoles in Water
An efficient, regioselective, one-pot and two-step synthesis of β-hydroxy 1,4-disubstituted1,2,3-triazolesfrom a wide range of non-activated terminal alkynes and epoxides and sodium azide by way of a three-component click reaction using a catalytic amount of [meso-tetrakis(o-chlorophenyl)porphyrinato]copper(II) (5 mol%) in excellent isolated yields is described. The reactions were performed in water