Copper(I)‐Catalyzed Wittig Olefination Reactions of N ‐Tosylhydrazones with Trifluoromethylketones

Cuprous iodide‐catalyzed Wittig olefination reactions of N ‐tosylhydrazones with trifluoromethylketones are reported. This procedure provides an efficient method for the synthesis of various trifluoromethyl‐substituted alkenes in moderate to good yields (up to 89 % yield) and good stereoselectivity (up to 93 % E ‐selectivity). To the best of our knowledge, it is the first report of a Wittig reaction of N ‐tosylhydrazones with ketones.