Stereoselective Access to Fully Substituted Aldehyde‐Derived Silyl Enol Ethers by Iridium‐Catalyzed Alkene Isomerization
作者:Itai Massad、Heiko Sommer、Ilan Marek
DOI:10.1002/anie.202005058
日期:2020.9
An in situ generated cationic Ir‐catalyst isomerizes simple allylic silylethers into valuable, fully substituted aldehyde‐derived silylenolethers. Importantly, by judicious choice of substrate, either of the two possible stereoisomers of a given enolate derivative is accessible with complete stereoselectivity. One‐pot isomerization‐aldol and isomerization‐allylation processes illustrate the synthetic
Selective Hydrosilylation of 1-Alkynes Using Iridium Catalyst with Biphosphinine Ligand
作者:Yoshihiro Miyake、Eigo Isomura、Masahiko Iyoda
DOI:10.1246/cl.2006.836
日期:2006.8
The iridium-catalyzed hydrosilylation of alkynes in the presence of 4,4′,5,5′-tetramethylbiphosphinine (tmbp) has been explored. The hydrosilylation of alkynes in the presence of tmbp proceeds effectively to give β-(E)-vinylsilanes highly selectively in moderate to high yields, whereas a similar hydrosilylation in the absence of tmbp produces β-(Z)-vinylsilanes selectively. The stereoselectivity of these reactions suggests the importance of the electron-withdrawing properties of tmbp coordinated to iridium.
Allylsilanes in organic synthesis; convenient preparation of synthetic intermediates by catalytic hydrosilation of acetylenic alcohols
作者:Patrick J. Murphy、John L. Spencer、Garry Procter
DOI:10.1016/s0040-4039(00)94428-9
日期:1990.1
Synthetically useful vinylslane-alcohols such as (1) can be easily prepared by the catalytic hydrosilation of the appropriate acetylenic alcohols in high yield, and with excellent regioand stereoselectivity, without the need to protect the hydroxyl group.
Regio- and stereoselective hydrosilylation of terminal alkynes using Grubbs' first-generation olefin-metathesis catalyst
作者:Caterina S. Aricó、Liam R. Cox
DOI:10.1039/b409832c
日期:——
Grubbs' first-generation, Ru metathesis complex catalyses the hydrosilylation of terminal alkynes. The reaction exhibits an interesting selectivity profile that is dependent on the reaction concentration and more importantly on the silane employed.
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