Tetrahydroquinolines by Lewis Acid-promoted Friedel-Crafts Cyclizations
作者:Richard A. Bunce、Nicholas R. Cain、John G. Cooper
DOI:10.1080/00304948.2013.743420
日期:2013.1
optimum reagent for cyclization was dependent on both the nature and location of the substituent group on the aromatic ring. The required tetrahydroquinoline precursors were prepared in three steps fromsubstituted anilines using a strategy that overlaps with a previous synthesis of 4-aminoquinolines reported by Johnson and co-workers.8 Conjugate addition of anilines 1 to methyl acrylate gave the 3-anilinopropionate
Friedel–Crafts cyclization of tertiary alcohols using bismuth(III) triflate
作者:Baskar Nammalwar、Richard A. Bunce
DOI:10.1016/j.tetlet.2013.06.026
日期:2013.8
Bismuth(III) triflate [Bi(OTf)(3)] has been developed as an efficient and mild catalyst for intramolecular Friedel-Crafts cyclizations of tertiary alcohols to prepare disubstituted tetrahydronapthalenes, chromans, thiochromans, tetrahydroquinolines, and tetrahydroiso-quinolines. The method represents a unified strategy to synthesize a variety of ring systems from tertiary alcohols using a common Lewis acid. (C) 2013 Elsevier Ltd. All rights reserved.
Co-Catalyzed Hydroarylation of Unactivated Olefins
and functional group tolerant intramolecular hydroarylation of unactivatedolefins using a Co(salen) complex, a N-fluoropyridinium salt, and a disiloxane reagent was reported. This method, which was carried out at room temperature, afforded six-membered benzocyclic compounds from mono-, 1,1- or trans-1,2-di, and trisubstituted olefins.