Metal-free hydroarylation of the side chain carbon–carbon double bond of 5-(2-arylethenyl)-3-aryl-1,2,4-oxadiazoles in triflic acid
作者:Anna S Zalivatskaya、Dmitry S Ryabukhin、Marina V Tarasenko、Alexander Yu Ivanov、Irina A Boyarskaya、Elena V Grinenko、Ludmila V Osetrova、Eugeniy R Kofanov、Aleksander V Vasilyev
DOI:10.3762/bjoc.13.89
日期:——
CF3SO3H), both under thermal and microwave conditions, leads to 5-(2,2-diarylethyl)-3-aryl-1,2,4-oxadiazoles. The products are formed through the regioselective hydroarylation of the side chain carbon-carbon double bond of the starting oxadiazoles in yields up to 97%. According to NMR data and DFT calculations, N4,C-diprotonated forms of oxadiazoles are the electrophilic intermediates in this reaction.
5-(2-芳基乙烯基)-3-芳基-1,2,4-恶二唑与芳烃在纯三氟甲磺酸(TfOH,CF3SO3H)中的无金属反应,在热和微波条件下均导致5-(2 ,2-二芳基乙基)-3-芳基-1,2,4-恶二唑。该产物是通过起始恶二唑的侧链碳-碳双键的区域选择性加氢芳基化反应形成的,收率高达97%。根据NMR数据和DFT计算,N4,C-二质子化的恶二唑是该反应中的亲电子中间体。