Reactions of Quinolinecarbaldehydes with Arenes under Superelectrophilic Activation. NMR and DFT Studies of Dicationic Electrophilic Species
作者:Marina А. Borisova、Dmitry S. Ryabukhin、Alexander Yu. Ivanov、Irina A. Boyarskaya、Dar’ya V. Spiridonova、Mikhail O. Kompanets、Aleksander V. Vasilyev
DOI:10.1007/s10593-021-03015-0
日期:2021.10
electrophilic dications are expected to be generated from 2- and 4-quinolinecarbaldehydes compared to the other quinolinecarbaldehydes. Experimental studies of protonation of quinoline-2(6,8)-carbaldehydes in Brønsted acids (CF3SO3H, H2SO4) by means of 1H, 13C, and 15N NMR revealed the formation of the corresponding N-protonated O-protosolvated species. Reactions of quinoline-2(6,8)-carbaldehydes with
通过 DFT 计算从理论上研究了各种喹啉甲醛的N , O -Diprotonated 形式(dications)。发现与其他喹啉甲醛相比,预计最具反应性的亲电子指示由 2- 和 4- 喹啉甲醛产生。通过1 H、13 C 和15 N NMR对布朗斯台德酸(CF 3 SO 3 H、H 2 SO 4)中的喹啉-2(6,8)-甲醛进行质子化的实验研究揭示了相应的N的形成-质子化的O-原溶剂化的物种。在布朗斯台德 (TfOH) 和路易斯酸 (AlX 3 , X = Cl, Br) 或酸性沸石存在下,喹啉-2(6,8)-甲醛与芳烃的反应导致形成相应的 2(6,8 )-(二芳基甲基)喹啉。然而,6- 和 8- 喹啉甲醛产生了另外一些不寻常的产物——6(8)-(芳甲基)喹啉。