Acylcyanation of Terminal Acetylenes: Palladium-Catalyzed Addition of Aryloyl Cyanides to Arylacetylenes
作者:Kyoko Nozaki、Naomasa Sato、Hidemasa Takaya
DOI:10.1021/jo00089a006
日期:1994.5
Two different electron-withdrawing carbon substituents (aryloyl group and nitrile group) were introduced into terminal arylacetylenes by a new method, palladium-catalyzed intermolecular acylcyanation of the acetylenic bonds.
Ni(0)-Catalyzed Conjugate Addition of Me<sub>3</sub>SiCN to Ynones: α-Bromo-β-cyano Tetrasubstituted Enones
作者:Takayoshi Arai、Yuuki Suemitsu、Yui Ikematsu
DOI:10.1021/ol802508q
日期:2009.1.15
Conjugate addition of Me3SiCN to ynones is smoothly catalyzed by Ni(cod)(2) to give the beta-cyanosilyloxyallene quantitatively. Further reaction of the silyloxyallenes with NBS provides the tetrasubstituted alpha-bromo-beta-cyano enones in high yields (up to 95%) with excellent Z-selectivity (E/Z = up to >1/99). X-ray crystallographic analysis showed a bent structure of the alpha-bromo-beta-cyano enone due to a deconjugation of the pi-bond and carbonyl group.