A Convenient Stereocontrolled Route to Trifluoromethylated Penta-2<i>E</i>,4<i>E</i>- or 2<i>Z</i>,4<i>E</i>-dienenitriles<b />
作者:Yanchang Shen、Yuming Zhang、Jie Sun
DOI:10.1055/s-2002-35979
日期:——
The phosphoryl-stabilized carbanions 2, generated from the corresponding phosphonates and lithium diisopropylamide in tetrahydrofuran, were used to add regiospecifically to [(trifluoroacyl)cyanomethylenetriphenylphosphorane] (1) forming ylide anions 3. After protonation and elimination of triphenylphosphine oxide from 3, trifluoromethylated cyanoallylphosphonates 4 were obtained in 74-95% yields with
Novel synthesis of perfluoroalkylated α-iodo-α,β-unsaturated nitriles
作者:Yanchang Shen、Shu Gao
DOI:10.1016/s0022-1139(96)03496-3
日期:1996.10
The reaction of fluorinated ylide-anions, generated from nucleophilic addition of organolithium compounds to perfluoroacylcyanomethyl enetriphenylphosphoranes 1, with iodine or 1,2-diiodoethane afforded perfluoroalkylated a-iodo-a,b-unsaturated nitriles in 70–97% yields. Keywords: Fluorinated phosphorane; Synthesis; Perfluoroalkylated α-iodo-α,β-unsaturated nitriles; NMR spectroscopy; IR spectroscopy;