Nickel catalyzes the multicomponent coupling reaction of vinyl epoxides, alkynes, and dimethylzinc to provide hepta-2,5-dienyl alcohols as a mixture of E- and Z-isomers in high yields. Vinylcyclopropane participates in a similar multicomponent coupling reaction to afford dimethyl alpha-(hepta-2,5-dienyl)malonates with excellent E-stereoselectivity.
Stereoselective Coupling Reaction of Dimethylzinc and Alkyne toward Nickelacycles
Ni catalyst promotes the three-component coupling reaction of vinyloxacyclopropane, alkyne, and dimethylzinc to provide 2,5-heptadienyl alcohol in high yields. Vinylcyclopropane also participates in a similar three-component coupling reaction to afford dimethyl (α-heptadienyl)malonate with excellent E-stereoselectivity.