Reactions of electron-rich indoles with triflic anhydride
作者:Nageshwar R. Yepuri、Rachada Haritakul、Paul A. Keller、Brian W. Skelton、Allan H. White
DOI:10.1016/j.tetlet.2009.03.052
日期:2009.5
The reaction of electron-rich 3-aryl-substituted 4,6-dimethoxyindoles in the presence of base with triflicanhydride results in biaryl coupling, producing both 2,2′- and 2,7′-biindoles. Further, if acetone is present, the corresponding vinyl triflate is formed and subsequent reaction yields the known indolylpyrroloindoles and dimeric spiroindoles. This is the first reported synthesis of these compounds
Macrocyclic compounds containing four 3-substituted-4,6-dimethoxyindole units joined through the C2 and C7 positions, by a combination of direct links or methylene bridges, can be prepared by acid-catalyzed reactions of indole methanols and 2,7'-biindolyldimethanols with indoles and 2,7'-biindolyls.