When γ,δ-epoxy-α,β-unsaturated esters or amides were treated with 2 equiv of Grignard reagents in the presence of 10−24 mol % FeCl2, regio- and stereoselective substitution of the epoxide moiety with the Grignard reagent occurred to give exclusively δ-hydroxy-γ-alkyl or aryl-α,β-unsaturated esters or amides in good yields.
Palladium-catalysed regio- and stereoselective arylative substitution of γ,δ-epoxy-α,β-unsaturated esters and amides by sodium tetraaryl borates
作者:Yasemin Bilgi、Melih Kuş、Levent Artok
DOI:10.1039/d0ob01226b
日期:——
Palladium-catalysed reactions of γ,δ-epoxy-α,β-unsaturated esters and amides with NaBAr4 reagents proceeded regio- and stereoselectively, producing allylic homoallyl alcohols with aryl-substituents in the allylic position for a wide range of substrates. AsPh3 was found to be a competent ligand for the arylation reaction, whereas phosphine ligand/Lewis acidic organoboron combinations favoured the substitution
An Atom-Economic Synthesis of Bicyclo[3.1.0]hexanes by Rhodium N-Heterocyclic Carbene-Catalyzed Diastereoselective Tandem Hetero-[5 + 2] Cycloaddition/Claisen Rearrangement Reaction of Vinylic Oxiranes with Alkynes
作者:Jian-Jun Feng、Junliang Zhang
DOI:10.1021/ja2014604
日期:2011.5.18
The first synthetic application of a vinylic oxirane as a heteroatom-containing five-atom component in transition-metal-catalyzed cycloadditionreactions is reported. A new, efficient, diastereoselective tandem intramolecular hetero-[5+2] cycloaddition/Claisen rearrangement of vinylic oxirane-alkyne substrates that uses a rhodium NHC complex and provides strategically novel, atom-economic, regiospecific
The strategic marriage of method and motif. Total synthesis of varitriol
作者:Matthew Brichacek、Lindsay A. Batory、Nicholas A. McGrath、Jon T. Njardarson
DOI:10.1016/j.tet.2010.03.038
日期:2010.6
Detailed in this report are several new efficient synthetic approaches toward the natural product anti cancer agent varitriol, culminating in a concise total synthesis. A common theme for these routes is that they employ a new catalytic stereoselective vinyl oxirane ring expansion reaction, which provides rapid access to the common cis-2,5-tetrahydrofuran core. The combination of careful synthetic
Palladium-mediated vicinal cleavage of allyl epoxides with retention of stereochemistry: a cis hydroxylation equivalent
作者:Barry M. Trost、Steven R. Angle
DOI:10.1021/ja00307a059
日期:1985.10
Synthese regio- et diastereoselective de cis-diols-1,2 (sous forme de carbonate) a partir de vinylepoxydes par reaction avec le dioxyde de carbone en presence de (triisopropylphosphite) 3 palladium
合成这些区域和非对映选择性 de cis-diols-1,2 (sous forme de carbone) a partir devinylepoxydes par 反应 avec le dioxyde de carbone en存在 de (triisopropylphosphite) 3 钯