Regiochemistry of the microwave-assisted reaction between aromatic amines and α-bromoketones to yield substituted 1H-indoles
作者:Yosu Vara、Eneko Aldaba、Ana Arrieta、José L. Pizarro、María I. Arriortua、Fernando P. Cossío
DOI:10.1039/b719641e
日期:——
Bischler (or Bischler-Mohlau) reaction between aromaticamines and alpha-bromoketones has been studied by computational and experimental techniques. It has been found that in many cases the reaction yields are improved under microwave irradiation and working in the absence of solvent. When di- and trisubstituted amines are used as substrates the regioselectivity of the reaction is different to that obtained
Unusual rearrangements in activated indoles: Synthesis of indoloquinolines, dibenzonaphthyridines and indolobenzodiazepines
作者:Ji Qu、Mohan Bhadbhade、Jeremy C. Dobrowolski、Naresh Kumar、David StC. Black
DOI:10.1016/j.tet.2020.131375
日期:2020.8
2-acetamidobenzyl chloride gave 3-alkylated indoles rather than those substituted at nitrogen. Similar reactions with 3-arylindoles gave reduced indoloquinolines, and a 2,3-diphenylindole gave a 3-alkylated indole. On reaction with phosphoryl chloride, the amidobenzyl-indoles undergo rearrangement to benzonaphthyridines. Similarly, the indoloquinolines undergo rearrangement to benzodiazepino-indoles.
Calix[3]indoles, new macrocyclic tris(indolylmethylene) compounds with 2,7-linkages
作者:David St. C. Black、Michael C. Bowyer、Naresh Kumar、Peter S. R. Mitchell
DOI:10.1039/c39930000819
日期:——
A series of macrocyclic tris(indolylmethylene) compounds (calix[3]indoles] can be obtained from 7- or 2-hydroxymethylindoles or from the combination of either an indole with a bis(hydroxymethyl)-2,7′-diindolylmethane or a bis(hydroxymethyl)indole with a 2,7′-diindolylmethane; an isomeric series can be obtained from the combination of an indole with a bis(hydroxymethyl)-2,2′-diindolylmethane.
作者:Ashley W. Jones、Bambang Purwono、Paul K. Bowyer、Peter S.R. Mitchell、Naresh Kumar、Stephen J. Nugent、Katrina A. Jolliffe、David StC. Black
DOI:10.1016/j.tet.2004.08.086
日期:2004.11
A range of 3-substituted-4,6-dimethoxyindoles bearing electron-withdrawing groups in either the 2- or 7-position, can be nitrated using nitric acid adsorbed on silica, to give 7-nitro and 2-nitro-indoles, respectively. A 1-cyano-indole gives regioselectively the 2-nitro-indole with loss of the cyano group.
Mechanisms of cyclisation of indolo oxime ethers I. Formation of ethyl 9,11-dimethoxy indolo[2,3-c]quinoline-6-carboxylates
作者:Kylie A. Clayton、David StC. Black、Jason B. Harper
DOI:10.1016/j.tet.2007.08.026
日期:2007.10
investigated using 1H NMR spectroscopy to determine the mechanism of formation of the corresponding ethyl 9,11-dimethoxy indolo[2,3-c]quinoline-6-carboxylates. The electronic requirements of the reaction were determined and, along with the observation of an intermediate in the process, indicated that the reaction proceeds through an electrocyclicmechanism. The importance of the ester moiety in such a process
使用1 H NMR光谱研究了一系列3'-芳基-4',6'-二甲氧基吲哚-2'-基-2-(羟基亚氨基)乙酸乙酯的环化反应,以确定相应的乙基9的形成机理, 11-二甲氧基吲哚[2,3 - c ]喹啉-6-羧酸盐。确定了反应的电子要求,并与该过程中的中间体一起观察到,表明反应是通过电循环机理进行的。讨论了在这种方法中酯部分的重要性。