Regiocontrolled Synthesis of Carbocycle-Fused Indoles via Arylation of Silyl Enol Ethers with <i>o</i>-Nitrophenylphenyliodonium Fluoride
作者:Tetsuo Iwama、Vladimir B. Birman、Sergey A. Kozmin、Viresh H. Rawal
DOI:10.1021/ol990759j
日期:1999.8.1
[formula: see text] A new, regiocontrolledsynthesis of carbocycle-fused indoles has been developed. The two-step procedure involves first the regiospecific arylation of silyl enol ethers with o-nitrophenylphenyliodonium fluoride (1). Reduction of the nitro group on the aromatic ring with TiCl3 followed by spontaneous condensation of the aniline with the ketone then affords the indole products.
Ene-hydrazide from Enol Triflate for the Regioselective Fischer Indole Synthesis
作者:Byeong-Yun Lim、Bo-Eun Jung、Cheon-Gyu Cho
DOI:10.1021/ol502031q
日期:2014.9.5
Ene-hydrazide prepared from enoltriflate undergoes a Fischer indolization reaction to give the corresponding indole with complete regioselectivity. The starting enoltriflate is readily accessed in regiochemically defined form from the ketone precursor via various well-established methods. This new protocol was successfully applied to the synthesis of desbromoarborescidine A, a natural β-carboline
Synthesis of 1,2,3,4-tetrahydrocarbazoles and related tricyclic indoles
作者:Tricia L. Scott、Nicholas Burke、Grissell Carrero-Martínez、Björn C.G. Söderberg
DOI:10.1016/j.tet.2006.11.052
日期:2007.1
Reduction of 2-(2-nitrophenyl)-2-cyclohexene-1-ones using palladium on carbon under 1 atm of hydrogen gas at ambient temperature affords 1,2,3,4-tetrahydrocarbazoles in excellent isolated yields. The starting materials were prepared by intermolecular Stille coupling of 2-iodo-2-cyclohexen-1-ones with 2-(tributylstannyl)-1-nitrobenzenes.
Control of the Chemoselectivity of Metal <i>N</i>-Aryl Nitrene Reactivity: C–H Bond Amination versus Electrocyclization
作者:Chen Kong、Navendu Jana、Crystalann Jones、Tom G. Driver
DOI:10.1021/jacs.6b07026
日期:2016.10.12
A mechanism study to identify the elements that control the chemoselectivity of metal-catalyzed N-atom transfer reactions of styryl azides is presented. Our studies show that the proclivity of the metal N-aryl nitrene to participate in sp3-C-H bond amination or electrocyclization reactions can be controlled by either the substrate or the catalyst. Electrocyclization is favored for mono-β-substituted
介绍了一种机制研究,以确定控制金属催化的苯乙烯基叠氮化物 N 原子转移反应的化学选择性的元素。我们的研究表明,金属 N-芳基氮烯参与 sp3-CH 键胺化或电环化反应的倾向可以通过底物或催化剂来控制。单-β-取代和空间上非拥挤的苯乙烯基叠氮化物有利于电环化,而当存在叔烯丙基反应中心时,优选通过 H 原子抽离-自由基重组机制进行 sp3-CH 键胺化。即使存在减弱的烯丙基 CH 键,我们的数据表明吲哚仍然是通过电环化而不是常见的烯丙基中间体形成的。