Copper(I)-Catalyzed Wittig Olefination Reactions of<i>N</i>-Tosylhydrazones with Trifluoromethylketones
作者:Qiang Sha、Yunyang Wei
DOI:10.1002/cctc.201300583
日期:2014.1
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
An efficient method for the synthesis of (Z)-selective α-trifluoromethyl alkenyl triflates is described. As an important fluorinated building block, it is utilized successfully for the synthesis of various trifluoromethyl derivatives such as diarylethylenes, enynes, alkynes, and benzofurans.