Gold-catalyzed cycloisomerizations of ene-ynamides
作者:Sylvain Couty、Christophe Meyer、Janine Cossy
DOI:10.1016/j.tet.2008.10.108
日期:2009.2
The gold-catalyzedcycloisomerizations of 1,6-ene-ynamides proceed under mild conditions and lead to cyclobutanones from terminal or trimethylsilyl substituted ynamides, or to carbonyl compounds bearing a 2,3-methanopyrrolidine subunit from substrates possessing a propargylic alcohol moiety. High diastereoselectivities are observed with 1,6-ene-ynamides having a stereocenter at the α or β position
Configuration-Dependent Ring Opening of Silyloxiranes: Synthesis of Functionalized Alkenes or Tetrahydrofurans
作者:Jens Lange、Ernst Schaumann
DOI:10.1002/ejoc.200900448
日期:2009.9
cis- and trans-Silyloxiranes with a potential tosylate or bromide leaving group in the β position are available by the diastereospecific reduction of the corresponding alkynes with DIBAL-H and hydrosilylation with silanes, respectively. In the reaction with the anion of a silylthioacetal, the outcome of the reaction is configuration dependent: the cis-oxiranes add nucleophilic methanthiolate and give
Hydrosilylation of alkynes catalyzed by ruthenium carbene complexes
作者:Sarah V. Maifeld、Michael N. Tran、Daesung Lee
DOI:10.1016/j.tetlet.2004.11.025
日期:2005.1
Hydrosilylation of terminal alkynes with a variety of silanes catalyzed by Cl2(PCy3)2RuCHPh (1) affords mainly the Z-isomer via trans addition in excellent yields. The presence of a hydroxyl group in close proximity to the triple bond was observed to exert a strong directing effect, resulting in the highly selective formation of the α-isomer. Intramolecular hydrosilylation of a homopropargylic silyl
Regio‐ and Enantioselective Monoborylation of Alkenylsilanes Catalyzed by an Electron‐Donating Chiral Phosphine–Copper(I) Complex
作者:Koji Kubota、Eiji Yamamoto、Hajime Ito
DOI:10.1002/adsc.201300765
日期:2013.12.16
AbstractAn asymmetric monoborylation of alkenylsilanes catalyzed by a copper(I) complex with the chiral bisphosphine ligand BenzP* is reported. The reaction proceeded with excellent regioselectivity and high enantioselectivity to afford the corresponding optically active organoboronate esters with a stereogenic CB bond containing a vicinal silyl group. The synthetic utility of the product is demonstrated through stepwise transformations to multifunctional optically active compounds in a stereospecific manner.magnified image
DENER, JEFFREY M.;HART, DAVID J., TETRAHEDRON, 44,(1988) N 23, C. 7037-7046