Reactions of quinoline-2(6,8)-carbaldehydes with arenes by the action of various Brønsted or Lewis acids: synthesis of diarylmethylquinolines
作者:Marina А. Borisova、Dmitry S. Ryabukhin、Aleksander V. Vasilyev
DOI:10.1007/s10593-020-02759-5
日期:2020.7
The reactions of quinoline-2(6,8)-carbaldehydes with arenes by the action of strong Brønsted (H2SO4, CF3SO3H) or Lewis (AlCl3, AlBr3) acids led to the formation of substituted diarylmethylquinolines in high yields.
在强布朗斯台德酸(H 2 SO 4,CF 3 SO 3 H)或路易斯酸(AlCl 3,AlBr 3)的作用下,喹啉2(6,8)-甲醛与芳烃的反应导致形成取代的二芳基甲基喹啉高产。
The Superacid Induced Condensation of Quinolinecarboxaldehydes with Arenes
作者:Douglas A. Klumpp、Andre Jones、Siufu Lau、Sarah de Leon、Manuel Garza
DOI:10.1055/s-2000-6322
日期:——
A variety of quinolinecarboxaldehydes have been reacted with arenes in the Brönsted superacid, CF3SO3H (triflic acid) to give condensation products in good to excellent yields (52-99%). The quinolinecarboxaldehydes are significantly more reactive than 2-naphthalenecarboxaldehyde. It is proposed that the increased reactivity is due to the formation of dicationic, electrophilic intermediates.
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 15NNMR 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。
Transition-Metal Free C–C Bond Cross-Coupling of Aryl Ethers with Diarylmethanes
We describe a general and efficient transition-metal free C–C bond cross-coupling of (hetero)arylethers and diarylmethanes via C(sp2)–O bond cleavage. The coupling reactions mediated by KHMDS proceeded well with high efficiency, broad substrate scope, and good functional group tolerance. The robustness and practicability of this protocol also have been demonstrated by easy gram-scale preparation and
Palladium-Catalyzed Direct Arylation of Aryl(azaaryl)methanes with Aryl Halides Providing Triarylmethanes
作者:Takashi Niwa、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1021/ol0708119
日期:2007.6.1
Direct arylation of aryl(azaaryl)methanes with aryl halides takes place at the benzylic position in the presence of a hydroxide base under palladium catalysis to yield triarylmethanes.