Synthesis of 2-Acylindoles via Ag- and Cu-Catalyzed anti-Michael Hydroamination of β-(2-Aminophenyl)-α,β-ynones: Experimental Results and DFT Calculations
作者:Navnath D. Rode、Issam Abdalghani、Antonio Arcadi、Massimiliano Aschi、Marco Chiarini、Fabio Marinelli
DOI:10.1021/acs.joc.8b00508
日期:2018.6.15
acyl group linked to the triple bond. By contrast with the previously reported gold-catalyzed reaction of β-(2-aminophenyl)-α,β-ynones, which resulted in the formation of dibenzo[1,5]diazocines through a sequential process triggered by an intermolecular hydroamination, a selective intramolecular anti-Michael hydroamination was observed in the present study by silver/copper catalysis. Density functional
在(微波)MW加热下,在20mol%AgOTf的存在下,β-(2-氨基苯基)-α,β-炔酮以良好的产率提供了3-未取代的2-酰基吲哚。使用CuOTf作为催化剂导致相似的反应结果,通常具有较低的效率。这种转化代表了5 -endo-dig的第一个例子带有连接到三键的酰基的2-炔基苯胺的环化。与先前报道的β-(2-氨基苯基)-α,β-炔酮的金催化反应相反,该反应通过分子间氢胺化引发的顺序过程导致了二苯并[1,5]重氮电影的形成。在本研究中,通过银/铜催化观察到了分子内抗迈克尔加氢胺化反应。对Ag催化的反应的密度泛函理论计算表明,该催化剂在与实验观察到的环化一致的TS中诱导了静电排列。