Synthesis of indolo- and benzothieno[3,2-<i>c</i>]quinolines <i>via</i> POCl<sub>3</sub> mediated tandem cyclization of <i>o</i>-alkynylisocyanobenzenes derived from <i>o</i>-alkynyl-<i>N</i>-phenylformamides
A synthesis of indolo[3,2-c]quinolines and benzothieno[3,2-c]quinolines has been developed employing o-alkynyl-N-phenylformamide derivatives as the substrates. The reaction proceeded via a tandem process involving POCl3-assisted intramolecular cyclization of the firstly formed o-alkynylisocyanobenzenes, leading to the desired products in moderate to high yields. Furthermore, the reaction is efficient
使用邻炔基-N-苯基甲酰胺衍生物作为底物,开发了吲哚并[3,2- c ]喹啉和苯并噻吩并[3,2- c ]喹啉的合成方法。该反应通过串联过程进行,包括 POCl 3辅助的分子内环化首先形成的邻炔基异氰基苯,以中等至高产率产生所需的产物。此外,该反应在克级上是有效的,并且通过胺化、Suzuzki-Miyaura 反应和 Heck 交叉偶联对产物进行了结构修饰。几种选定吲哚的光物理性质[3,2- c] 喹啉通过紫外可见和荧光光谱进行了研究,并使用时间相关的 DFT 计算进行了合理化。
Synthesis of 3-Iodoindoles by Electrophilic Cyclization of <i>N</i>,<i>N</i>-Dialkyl-2-(1-alkynyl)anilines
作者:Dawei Yue、Richard C. Larock
DOI:10.1021/ol0498996
日期:2004.3.1
A wide variety of N-alkyl-3-iodoindoles are readily prepared under very mild reaction conditions by the palladium/copper-catalyzed cross-coupling of N,N-dialkyl-o-iodoanilines and terminal alkynes, followed by electrophilic cyclization by I-2. Alkyl-, aryl-, and vinylic-substituted alkynes all undergo iodocyclization in excellent yields.
Synthesis of 3-Iodoindoles by the Pd/Cu-Catalyzed Coupling of <i>N,N</i>-Dialkyl-2-iodoanilines and Terminal Acetylenes, Followed by Electrophilic Cyclization
作者:Dawei Yue、Tuanli Yao、Richard C. Larock
DOI:10.1021/jo051549p
日期:2006.1.1
3-lodoindoles have been prepared in excellent yields by coupling terminal acetylenes with N,N-dialkyl-o-iodoanilines in the presence of a Pd/Cu catalyst, followed by an electrophilic cyclization of the resulting N,N-dialkyl-o-(1-alkynyl)anilines using I-2 in CH2Cl2. Aryl-, vinylic-, alkyl-, and silyl-substituted terminal acetylenes undergo this process to produce excellent yields of 3-iodoindoles. The reactivity of the carbon-nitrogen bond cleavage during cyclization follows the following order: Me > n-Bu, Me > Ph, and cyclohexyl > Me. Subsequent palladium-catalyzed.Sonogashira, Suzuki, and Heck reactions of the resulting 3-iodoindoles proceed smoothly in good yields.
Cascade Electrophilic Iodocyclization: Efficient Preparation of 4-Iodomethyl Substituted Tetrahydro-β-carbolines and Formal Synthesis of Oxopropaline G
作者:Hongjian Song、Yongxian Liu、Qingmin Wang
DOI:10.1021/ol401303f
日期:2013.7.5
4-Iodomethyl substituted tetrahydro-beta-carbolines, the core structure of numerous natural products and bioactive molecules, are readily prepared via I-2-promoted cascade electrophilic cyclization. The reactivity differences of olefins and alkynes ensure that the reaction proceeds smoothly. This methodology was successfully applied to the formal synthesis of oxopropaline G.