Condensed Heteroaromatic Ring Systems; XVII:1Palladium-Catalyzed Cyclization of β-(2-Halophenyl)amino Substituted α,β-Unsaturated Ketones and Esters to 2,3-Disubstituted Indoles
I<sub>2</sub>/O<sub>2</sub>-Promoted Domino Reactions of Isatins or 3-Hydroxyindolin-2-one Derivatives with Enaminones
作者:Wen-Juan Hao、Jian-Qiang Wang、Xiao-Ping Xu、Shi-Lei Zhang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/jo401773j
日期:2013.12.20
I2-promoted domino reactions of isatins or 3-hydroxyindolin-2-one derivatives with enaminones under O2 conditions have been established. The reactions of isatins with enaminones afforded functionalized tetracyclic pyrrolo[2,3,4-kl]acridine derivatives in moderate to good yields through domino cyclization and C–H oxidation. The reactions of 3-hydroxyindolin-2-one derivatives with enaminones proceeded well
An acid-promoted multicomponent reaction for the direct C(sp3)N bond formation was achieved through intermolecular allylic amidation in a one-pot operation to synthesize 7-acetamido tetrahydroindole derivatives from simple and readily available arylglyoxal monohydrates, acetonitriles, and enamines of 5,5-dimethyl-1,3-cyclohexadione (dimedone) has been developed. Here acetonitrile acts both as solvent
New formal (3+3) cycloaddition of enaminones for forming tetracyclic indolo[2,3-b]quinolines under microwave irradiation
作者:Meng-Yuan Li、Hai-Wei Xu、Wei Fan、Qin Ye、Xue Wang、Bo Jiang、Shu-Liang Wang、Shu-Jiang Tu
DOI:10.1016/j.tet.2013.11.022
日期:2014.1
Concise and efficient base-promoted domino formal (3+3) cycloaddition has been established for the formation of tetracyclic indolo[2,3-b]quinoline derivatives under microwave heating. The present methodology shows attractive properties, such as the maximum efficiency of a process, short reaction periods, and operational simplicity, and it can avoid time-consuming and costly syntheses, tedious work-up
已经建立了简捷高效的碱促进的多米诺甲醛缩甲醛(3 + 3)环加成反应,用于在微波加热下形成四环吲哚并[2,3- b ]喹啉衍生物。本方法学显示出有吸引力的性质,例如过程的最大效率,较短的反应时间和操作简便性,并且可以避免耗时且昂贵的合成,繁琐的后处理和中间体的分离。该化学方法为构建四环吲哚并[2,3- b ]喹啉骨架提供了简便而有希望的合成策略。
The involvement of the trisulfur radical anion in electron-catalyzed sulfur insertion reactions: facile synthesis of benzothiazine derivatives under transition metal-free conditions
作者:Zheng-Yang Gu、Jia-Jia Cao、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1039/c6sc00240d
日期:——
An efficient and practical synthesis of benzothiazine by K2S initiated sulfur insertion reaction with enaminones via electron catalysis is developed. This protocol provides a new, environment-friendly and simple strategy to construct benzothiazine derivatives viaformation of two C–S bonds under transition metal-free, additive-free and oxidant-free conditions. K2S not only provides the sulfur insertion
Palladium-Catalyzed Cascade Reactions of Isocyanides with Enaminones: Synthesis of 4-Aminoquinoline Derivatives
作者:Zheng-Yang Gu、Tong-Hao Zhu、Jia-Jia Cao、Xiao-Ping Xu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/cs400904t
日期:2014.1.3
A method for palladium-catalyzed cascade reactions of isocyanides with enaminones has been developed. This methodology provides a direct approach to 4-aminoquinoline derivatives under mild conditions with up to 98% yields.