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Keywords:

  • benzoxepines;
  • copper;
  • ortho-halo-β-chlorostyrenes;
  • ketones;
  • tandem reactions

Abstract

A copper-catalyzed cyclization reaction of trifluoromethyl-containing ortho-halo-β-chlorostyrenes with ketones has been developed. Using a combination of copper(I) bromide, 2,2,6,6-tetramethylheptane-3,5-dione and sodium tert-butoxide, a variety of 4-trifluoromethylbenzoxepines was prepared in moderate to good yields by the tandem α-alkenylation of ketones with subsequent O-arylation.