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Silaborative C-C Coupling Reaction

Silylboranes, 1,3-dienes, and aldehydes are coupled in the presence of a platinum catalyst [Ref. 1]. The reaction provided O-silylated homoallylic alcohols with high stereoselectivities for the syn-stereoisomers. The three-component coupling may involve σ-allylplatinum species as a key reactive interemediate.

silaborative C-C coupling.jpg
 

Catalytic Hydroalkynylation

The C-H bonds of terminal alkynes are known to add not only to alkynes (homo- and cross-dimerization), but also to highly reactive C=C bonds in allenes, cyclopropenes, and norbornadiene. However, no reaction systems have been established for hydroalkynylation of less reactive C=C bonds. We found that the alkyne C–H bond adds to a carbon-carbon double bond of 1,3-dienes, styrenes, and norbornene at room temperature in the presence of a nickel catalyst in regio- and stereoselective manners [Ref. 2].

hydroalkynylation.jpg
 

Related Researches

References

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Last-modified: 2009-01-21 (水) 18:12:32 (4907d)