Holmes, Andrew B.; Hughes, Andrew B.; Smith, Adrian L., Journal of the Chemical Society. Perkin transactions I, 1992, # 9, p. 1089 - 1100
作者:Holmes, Andrew B.、Hughes, Andrew B.、Smith, Adrian L.、Williams, Simon F.
DOI:——
日期:——
Inter- and Intramolecular Crotyltitanation of Acetals: A Novel and Effective Route to Three- to Five-Membered Vinylcycloalkanes and Bicyclic Fused Compounds
η3-Crotyltitanocenes react with acetals to produce homoallylic ethers. The intramolecular coupling involving tethered dienyl acetals provides a convenient access to vinylcycloalkanes and bicyclic fusedcompounds. This new cyclization reaction proceeds with a total regioselectivity in the exo fashion, and with good to excellent diastereoselectivity depending especially on the tether chain length.
A New Ruthenium-Catalyzed Hydrogen-Transfer Reaction: Transformation of 3-Benzyl But-1-ynyl Ethers into 1,3-Dienes and Benzaldehyde
作者:Kuo-Liang Yeh、Bo Liu、Ching-Yu Lo、Heh-Lung Huang、Rai-Shung Liu
DOI:10.1021/ja012623y
日期:2002.6.1
We report a ruthenium-catalyzedreaction for various 3-benzyl but-1-ynyl ethers with suitable functionalities. Treatment of these substrates with TpRu(PPh3)(CH3CN)2PF6 (8.0 mol %) catalyst in 1,2-dichloroethane (80 degrees C, 12 h) afforded functionalized 1,3-dienes and benzyl aldehyde in good yields. This process is considered to be a tandem dealkoxylation and transfer hydrogenation. Deuterium-labeling