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Keywords:

  • C[BOND]C coupling;
  • conjugate additions;
  • enolsilanes;
  • nickel;
  • olefins
Thumbnail image of graphical abstract

In the presence of a silyl triflate and an amine base, a nickel–phosphine complex catalyzes the direct conjugate addition of ethylene, α-olefins, and aryl alkenes to unsaturated aldehydes and ketones. The enolsilane products are isolated in good to very high yield, and in very high stereoselectivity for some cases. The alkene is a functional equivalent of an alkenylmetal reagent in the transformation.