Silylzincation of carbon–carbon multiple bonds revisited
作者:Gertrud Auer、Martin Oestreich
DOI:10.1039/b513528a
日期:——
The first investigation of the copper-catalyzed silylzincation of alkynes as well as a diene and styrene using bis(triorganosilyl) zinc reagents led to the development of an efficient procedure and the disclosure of an unexpected bissilylation and unforeseen regioselectivity.
Tandem-Directed Regioselective Hydroformylation/β-Elimination: A Practical Method for the Synthesis of Enals
作者:Bernhard Breit、Achim Bruch、Antje Gebert
DOI:10.1055/s-2008-1067140
日期:2008.7
A practical synthesis of α,β-unsaturated aldehydes by a tandem-directed hydroformylation/β -elimination process of allylic o-DPPB esters is reported. The o-DPPB group served as an effective controller for regioselectivity of the hydroformylation towards the desired aldolate isomer, and was subsequently eliminated in situ by mild standard bases. The reaction is rather general for the preparation of
Directed Branched-Regioselective Hydroformylation of 2-Substituted Allylico-DPPB Esters
作者:Bernhard Breit、Christian U. Grünanger、Olivier Abillard
DOI:10.1002/ejoc.200700120
日期:2007.5
Branched-regioselectivehydroformylation of allylic o-DPPB esters has been accomplished with mono- and disubstituted alkene functions in good to excellent yields and selectivities. Optimized reaction conditions allowed the reaction of even trisubstitued alkenic functions. These reactions occur as a result of a significant rate-accelerating effect exerted by the catalyst-directing o-DPPB group, as exemplified
Homologation Reaction of γ-Silicon Substituted Allylic Alcohols Using Organoaluminium Reagents and Diiodomethane
作者:Yutaka Ukaji、Katsuhiko Inomata
DOI:10.1246/cl.1992.2353
日期:1992.12
One carbon homologation reaction of γ-silicon substituted allylic alcohols was found to proceed by the treatment with triethylaluminium followed by diethylaluminium chloride and diiodomethane to afford homoallylic iodides instead of the corresponding cyclopropanes. Silicon function introduced to γ-position was crucial for the homologation reaction.