Abstract
The studies on nickel(0)-catalyzed three-component reactions via C-H and C-C bond activation were described. Highly regio- and stereoselective cross-trimerization of alkynes proceeded to give the corresponding 1,3-diene-5-yne by combination of triisopropylsilylacetylene and identical or distinct two alkynes via selective terminal C-H bond activation of triisopropylsilylacetylene in the presence of Ni(cod)2/phosphine catalyst. The methodology could be also extended toward the three-component reaction among two alkynes and a norbornene to give the 1,5-enyne. On the other hand, our interest also focused on three-component reductive coupling reaction between ring-strained cyclic alkene, aryl aldehyde and silane. Using methylenecyclopropane, reductive coupling reaction with aryl aldehyde and triisopropylsilane proceeded to yield silylated allylic alcohols via C-C bond cleavage of methylenecyclopropane ring in the presence of Ni(cod)2/NHC catalyst. We also found an unprecedented three-component reductive coupling via aromatic C-H bond activation of aryl aldehyde at the ortho position by combination with norbornene and triisopropylsilane leading to silylated indanol using Ni(cod)2/NHC catalyst.
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