Brønsted acid promoted benzylic C–H bond functionalization of azaarenes: nucleophilic addition to aldehydes
作者:Fang-Fang Wang、Cui-Ping Luo、Yi Wang、Guojun Deng、Luo Yang
DOI:10.1039/c2ob26604k
日期:——
A practical Brønsted acid promoted benzylicC–Hfunctionalization of 2-methylazaarenes and nucleophilic addition to aldehydes was developed in good to excellent yields. A six-membered hydrogen-bonding transition state is proposed to be crucial for the reaction. Ready availability of the two starting materials, the use of acetic acid as the catalyst and the facile reaction conditions will guarantee
Lewis-Acid-Catalyzed Benzylic Reactions of 2-Methylazaarenes with Aldehydes
作者:Dan Mao、Gang Hong、Shengying Wu、Xin Liu、Jianjun Yu、Limin Wang
DOI:10.1002/ejoc.201400073
日期:2014.5
Lewis-acid-catalyzedbenzylicreactions of 2-methylazaarenes with aldehydes have been investigated. Series of azaarene derivatives were afforded by this reaction. 2-(Pyridin-2-yl)ethanols with common substituents were formed through the LiNTf2-promoted aldol reaction for the first time. 2-Alkenylpyridines, exclusively in the form of the E isomers, were synthesized in the presence of LiNTf2 cooperated
已经研究了路易斯酸催化的 2-甲基氮杂芳烃与醛的苄基反应。该反应得到一系列氮杂芳烃衍生物。首次通过LiNTf2促进的羟醛反应形成了具有常见取代基的2-(Pyridin-2-yl)乙醇。在 LiNTf2 与 H2NTf 协同作用下,合成了仅以 E 异构体形式存在的 2-烯基吡啶。在La(Pfb)3催化下,2-甲基喹啉与醛类在空气中反应,以高收率得到2-烯基喹啉。
Acid ionic liquid promoted addition of C(sp3)–H bond to aldehyde
作者:Xue-Yan Zhang、Dao-Qing Dong、Tao Yue、Shuang-Hong Hao、Zu-Li Wang
DOI:10.1016/j.tetlet.2014.08.034
日期:2014.10
A novel protocol for acid ionic liquid promoted C(sp(3))-H bond functionalization of alkyl azaarenes and nucleophilic addition to aldehydes was developed in good to excellent yields, which provides an efficient approach for the synthesis of alkyl-substituted azaarene derivatives. It is worthwhile to note that acid ionic liquid used for this reaction can be recycled and reused six times without a significant decrease in activity. (C) 2014 Elsevier Ltd. All rights reserved.
Werner, Chemische Berichte, 1903, vol. 36, p. 1683