Reactions of 2-carbonyl- and 2-hydroxy(or methoxy)alkyl-substituted benzimidazoles with arenes in the superacid CF<sub>3</sub>SO<sub>3</sub>H. NMR and DFT studies of dicationic electrophilic species
作者:Dmitry S Ryabukhin、Alexey N Turdakov、Natalia S Soldatova、Mikhail O Kompanets、Alexander Yu Ivanov、Irina A Boyarskaya、Aleksander V Vasilyev
DOI:10.3762/bjoc.15.191
日期:——
Reactions of 2-carbonyl- and 2-hydroxy(or methoxy)alkylbenzimidazoles with arenes in the Brønsted superacid TfOH resulted in the formation of the corresponding Friedel–Crafts reaction products, 2-diarylmethyl and 2-arylmethyl-substituted benzimidazoles, in yields up to 90%. The reaction intermediates, protonated species derived from starting benzimidazoles in TfOH, were thoroughly studied by means
2-羰基-和2-羟基(或甲氧基)烷基苯并咪唑与芳烃在布朗斯台德超强酸TfOH中反应,形成相应的弗里德尔-克来福特反应产物,2-二芳基甲基和2-芳基甲基取代的苯并咪唑,产率高达90%。通过 NMR 和 DFT 计算对反应中间体(源自 TfOH 中起始苯并咪唑的质子化物质)进行了深入研究,并讨论了合理的反应机理。