A copper-catalyzed oxydifluoroalkylation of β,γ-unsaturatedoximes has been developed. This reaction proceeded through a cascade of difluoroalkylation of alkene followed by nucleophilic attack of the hydroxyl group of oximes. This protocol features mild reaction conditions, low-cost catalyst, and broad substrate scope, which provides a facile method to synthesize isoxazolines with a fluorinated sidechain
Trichloroisocyanuric Acid Promoted Cascade Cyclization/Trifluoromethylation of Allylic Oximes: Synthesis of Trifluoromethylated Isoxazolines
作者:Weigang Zhang、Yingpeng Su、Ke-Hu Wang、Lili Wu、Bingbing Chang、Ya Shi、Danfeng Huang、Yulai Hu
DOI:10.1021/acs.orglett.6b03582
日期:2017.1.20
Cheap and commercially available trichloroisocyanuric acid has been used to promote trifluoromethylation by using TMSCF3 as the trifluoromethyl source. The method provides a novel and efficient protocol for the construction of CF3-containing 4,5-dihydroisoxazoles from allylic oximes in good to excellent yields.