N-甲基化或非甲基化3,4-二氢环戊[ b ]吲哚-1(2 H)-ones(3)和1,2,3,9-四氢咔唑-4(4 H)-one(10)的有效合成途径基于Pd催化的分子内Heck反应进行了详细的描述。在双官能底物12和三官能底物17的情况下,分别研究了环化的化学选择性。在后一种情况下,取决于催化剂,分别通过单Heck反应和双Heck反应获得溴化的吲哚18或四环化合物19。
irradiation has been shown to have a beneficial effect on catalyst preparation. The catalyst exhibited excellent activity in ligand‐free C−C Suzuki and Heck couplings with a large number of aryl iodide and bromides, in which microwave irradiation use cuts down reaction time. Pd/Si‐CD have shown high activity and selectivity in the hydrogenationreaction, and the semihydrogenation of phenyl acetylene was also
Condensed Heteroaromatic Ring Systems; XVII:<sup>1</sup>Palladium-Catalyzed Cyclization of β-(2-Halophenyl)amino Substituted α,β-Unsaturated Ketones and Esters to 2,3-Disubstituted Indoles
Palladium-catalyzed cyclization of β-(2-halophenyl)amino substituted α,β-unsaturated ketones and esters, prepared from 2-haloanilines by three different methods, gave 2,3-disubstituted indoles.
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。
Process for the preparation of indoles
申请人:Knipp Bernhard
公开号:US20070112054A1
公开(公告)日:2007-05-17
A process for the preparation of indoles, e.g. 1,2,3,9-tetrahydro-carbazol-4-one and derivatives thereof.
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