Palladium-Catalyzed, Stereoselective, Cyclizative Alkenylboration of Carbon−Carbon Double Bonds through Activation of a Boron−Chlorine Bond
作者:Masaki Daini、Michinori Suginome
DOI:10.1021/ja200856t
日期:2011.4.6
Palladium-catalyzed alkenylboration of carbon-carbon double bonds has been achieved using the reaction of chloro(diisopropylamino)boryl ethers of homoallylic alcohols with alkenylzirconium reagents. The reaction may proceed through an initial oxidative addition of the B-Cl bond, intramolecular insertion of the C═C bond into the B-Pd bond, transmetalation from the alkenylzirconium reagent, and reductive
The reaction of C2H4 and β-SiH containing azasilazirconacycle Cp2Zrκ2-N(SiHMe2)SiHMeCH2} (3), formed via a γ-abstraction reaction of Cp2ZrN(SiHMe2)2}H (1), follows an unusual pathway in which a rare Ï-bond metathesis reaction of ethylene generates a vinyl intermediate. That species undergoes a β-hydrogen abstraction under the reaction conditions to form a zirconium silanimine ethylene adduct en route to the metallacyclopentane product.