Synthesis of New Fluorine-Containing 1,2,3,4-Tetrahydroacridines
摘要:
A convenient method for the synthesis of a novel series of four 5-trilfluoromethyl-1,2,3,4-tetrahydroacridines, by intramolecular cyclization reactions of 2-trifluoroacetyl-1-(arylamino)-cyclohexene using polyphosphoric acid (PPA), is described. The six new enaminoketone intermediates were obtained by an oxygen-nitrogen exchange reaction from 2-trifluoroacetyl-1-methoxycyclohexene with six 4-substituted anilines.
The first proline-catalyzed Friedlander annulation for the synthesis of 2-substituted 4-trifluoromethyl quinoline derivatives is described. Excellent re gio selectivity as well as good yields were shown in a variety of cases, and a tandem aldol-cyclization pathway might be involved. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).