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