<i>gem</i>
‐Difluoroolefination of Diaryl Ketones and Enolizable Aldehydes with Difluoromethyl 2‐Pyridyl Sulfone: New Insights into the Julia–Kocienski Reaction
作者:Bing Gao、Yanchuan Zhao、Mingyou Hu、Chuanfa Ni、Jinbo Hu
DOI:10.1002/chem.201402183
日期:2014.6.16
olefination protocol underbasicconditions due to the retro‐aldol type decomposition of the key intermediate. Efficient gem‐difluoroolefination of aliphatic aldehydes was achieved by the use of an amide base generated in situ (from CsF and tris(trimethylsilyl)amine), which diminishes the undesired enolization of aliphatic aldehydes and provides a powerful synthetic method for chemoselective gem‐difluoroolefination