The $N$-heterocyclic carbene (NHC)--Ag(I) complexes 3a-c were synthesized from benzimidazolium chlorides (2a-c = NHC.HCl), incorporating benzyl derivatives and a 2-methoxyethyl group (a: $^3}$N = 2,4,6-trimethylbenzyl; b: $^3}$N = 2,3,5,6-tetramethylbenzyl; c: $^3}$N = pentamethylbenzyl). The compounds were characterized by spectroscopic and elemental analyses. The synthesized NHC-Ag(I) complexes (3a-c) were tested as catalysts for the catalytic three-component coupling reaction of aldehyde, alkyne, and amine to propargylamines in various solvents. All complexes were active catalysts for catalytic three-component coupling reactions with good yields under neat and mild conditions (after 4 h, yields of up to 94%).
由
苯并咪唑氯化物(2a-c = NHC.HCl),其中包含苄基衍
生物和一个 2-甲氧基乙基(a:$^3}$N = 2,4,6-三甲基苄基;b:$^3}$N = 2,3,5,6-四甲基苄基;c:$^3}$N = 五甲基苄基)。这些化合物通过光谱和元素分析进行了表征。合成的 NHC-Ag(I)复合物(3a-c)被用作催化剂,在各种溶剂中催化醛、炔和胺与
丙炔胺的三组分偶联反应。在纯净温和的条件下(4 小时后,产率高达 94%),所有络合物都是催化三组分偶联反应的活性催化剂。